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git/diff.c
Daniel Ferreira e4cb659ebd diff: export diffstat interface 
Make the diffstat interface (namely, the diffstat_t struct and
compute_diffstat) no longer be internal to diff.c and allow it to be used
by other parts of git.

This is helpful for code that may want to easily extract information
from files using the diff machinery, while flushing it differently from
how the show_* functions used by diff_flush() do it. One example is the
builtin implementation of git-add--interactive's status.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Đukić <slawica92@hotmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-11-14 11:10:04 +09:00

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/*
* Copyright (C) 2005 Junio C Hamano
*/
#include "cache.h"
#include "config.h"
#include "tempfile.h"
#include "quote.h"
#include "diff.h"
#include "diffcore.h"
#include "delta.h"
#include "xdiff-interface.h"
#include "color.h"
#include "attr.h"
#include "run-command.h"
#include "utf8.h"
#include "object-store.h"
#include "userdiff.h"
#include "submodule-config.h"
#include "submodule.h"
#include "hashmap.h"
#include "ll-merge.h"
#include "string-list.h"
#include "argv-array.h"
#include "graph.h"
#include "packfile.h"
#include "parse-options.h"
#include "help.h"
#include "promisor-remote.h"
#ifdef NO_FAST_WORKING_DIRECTORY
#define FAST_WORKING_DIRECTORY 0
#else
#define FAST_WORKING_DIRECTORY 1
#endif
static int diff_detect_rename_default;
static int diff_indent_heuristic = 1;
static int diff_rename_limit_default = 400;
static int diff_suppress_blank_empty;
static int diff_use_color_default = -1;
static int diff_color_moved_default;
static int diff_color_moved_ws_default;
static int diff_context_default = 3;
static int diff_interhunk_context_default;
static const char *diff_word_regex_cfg;
static const char *external_diff_cmd_cfg;
static const char *diff_order_file_cfg;
int diff_auto_refresh_index = 1;
static int diff_mnemonic_prefix;
static int diff_no_prefix;
static int diff_stat_graph_width;
static int diff_dirstat_permille_default = 30;
static struct diff_options default_diff_options;
static long diff_algorithm;
static unsigned ws_error_highlight_default = WSEH_NEW;
static char diff_colors[][COLOR_MAXLEN] = {
GIT_COLOR_RESET,
GIT_COLOR_NORMAL, /* CONTEXT */
GIT_COLOR_BOLD, /* METAINFO */
GIT_COLOR_CYAN, /* FRAGINFO */
GIT_COLOR_RED, /* OLD */
GIT_COLOR_GREEN, /* NEW */
GIT_COLOR_YELLOW, /* COMMIT */
GIT_COLOR_BG_RED, /* WHITESPACE */
GIT_COLOR_NORMAL, /* FUNCINFO */
GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
GIT_COLOR_FAINT, /* CONTEXT_DIM */
GIT_COLOR_FAINT_RED, /* OLD_DIM */
GIT_COLOR_FAINT_GREEN, /* NEW_DIM */
GIT_COLOR_BOLD, /* CONTEXT_BOLD */
GIT_COLOR_BOLD_RED, /* OLD_BOLD */
GIT_COLOR_BOLD_GREEN, /* NEW_BOLD */
};
static const char *color_diff_slots[] = {
[DIFF_CONTEXT] = "context",
[DIFF_METAINFO] = "meta",
[DIFF_FRAGINFO] = "frag",
[DIFF_FILE_OLD] = "old",
[DIFF_FILE_NEW] = "new",
[DIFF_COMMIT] = "commit",
[DIFF_WHITESPACE] = "whitespace",
[DIFF_FUNCINFO] = "func",
[DIFF_FILE_OLD_MOVED] = "oldMoved",
[DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
[DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
[DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
[DIFF_FILE_NEW_MOVED] = "newMoved",
[DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
[DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
[DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
[DIFF_CONTEXT_DIM] = "contextDimmed",
[DIFF_FILE_OLD_DIM] = "oldDimmed",
[DIFF_FILE_NEW_DIM] = "newDimmed",
[DIFF_CONTEXT_BOLD] = "contextBold",
[DIFF_FILE_OLD_BOLD] = "oldBold",
[DIFF_FILE_NEW_BOLD] = "newBold",
};
define_list_config_array_extra(color_diff_slots, {"plain"});
static int parse_diff_color_slot(const char *var)
{
if (!strcasecmp(var, "plain"))
return DIFF_CONTEXT;
return LOOKUP_CONFIG(color_diff_slots, var);
}
static int parse_dirstat_params(struct diff_options *options, const char *params_string,
struct strbuf *errmsg)
{
char *params_copy = xstrdup(params_string);
struct string_list params = STRING_LIST_INIT_NODUP;
int ret = 0;
int i;
if (*params_copy)
string_list_split_in_place(&params, params_copy, ',', -1);
for (i = 0; i < params.nr; i++) {
const char *p = params.items[i].string;
if (!strcmp(p, "changes")) {
options->flags.dirstat_by_line = 0;
options->flags.dirstat_by_file = 0;
} else if (!strcmp(p, "lines")) {
options->flags.dirstat_by_line = 1;
options->flags.dirstat_by_file = 0;
} else if (!strcmp(p, "files")) {
options->flags.dirstat_by_line = 0;
options->flags.dirstat_by_file = 1;
} else if (!strcmp(p, "noncumulative")) {
options->flags.dirstat_cumulative = 0;
} else if (!strcmp(p, "cumulative")) {
options->flags.dirstat_cumulative = 1;
} else if (isdigit(*p)) {
char *end;
int permille = strtoul(p, &end, 10) * 10;
if (*end == '.' && isdigit(*++end)) {
/* only use first digit */
permille += *end - '0';
/* .. and ignore any further digits */
while (isdigit(*++end))
; /* nothing */
}
if (!*end)
options->dirstat_permille = permille;
else {
strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
p);
ret++;
}
} else {
strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
ret++;
}
}
string_list_clear(&params, 0);
free(params_copy);
return ret;
}
static int parse_submodule_params(struct diff_options *options, const char *value)
{
if (!strcmp(value, "log"))
options->submodule_format = DIFF_SUBMODULE_LOG;
else if (!strcmp(value, "short"))
options->submodule_format = DIFF_SUBMODULE_SHORT;
else if (!strcmp(value, "diff"))
options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
/*
* Please update $__git_diff_submodule_formats in
* git-completion.bash when you add new formats.
*/
else
return -1;
return 0;
}
int git_config_rename(const char *var, const char *value)
{
if (!value)
return DIFF_DETECT_RENAME;
if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
return DIFF_DETECT_COPY;
return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
}
long parse_algorithm_value(const char *value)
{
if (!value)
return -1;
else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
return 0;
else if (!strcasecmp(value, "minimal"))
return XDF_NEED_MINIMAL;
else if (!strcasecmp(value, "patience"))
return XDF_PATIENCE_DIFF;
else if (!strcasecmp(value, "histogram"))
return XDF_HISTOGRAM_DIFF;
/*
* Please update $__git_diff_algorithms in git-completion.bash
* when you add new algorithms.
*/
return -1;
}
static int parse_one_token(const char **arg, const char *token)
{
const char *rest;
if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
*arg = rest;
return 1;
}
return 0;
}
static int parse_ws_error_highlight(const char *arg)
{
const char *orig_arg = arg;
unsigned val = 0;
while (*arg) {
if (parse_one_token(&arg, "none"))
val = 0;
else if (parse_one_token(&arg, "default"))
val = WSEH_NEW;
else if (parse_one_token(&arg, "all"))
val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
else if (parse_one_token(&arg, "new"))
val |= WSEH_NEW;
else if (parse_one_token(&arg, "old"))
val |= WSEH_OLD;
else if (parse_one_token(&arg, "context"))
val |= WSEH_CONTEXT;
else {
return -1 - (int)(arg - orig_arg);
}
if (*arg)
arg++;
}
return val;
}
/*
* These are to give UI layer defaults.
* The core-level commands such as git-diff-files should
* never be affected by the setting of diff.renames
* the user happens to have in the configuration file.
*/
void init_diff_ui_defaults(void)
{
diff_detect_rename_default = DIFF_DETECT_RENAME;
}
int git_diff_heuristic_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "diff.indentheuristic"))
diff_indent_heuristic = git_config_bool(var, value);
return 0;
}
static int parse_color_moved(const char *arg)
{
switch (git_parse_maybe_bool(arg)) {
case 0:
return COLOR_MOVED_NO;
case 1:
return COLOR_MOVED_DEFAULT;
default:
break;
}
if (!strcmp(arg, "no"))
return COLOR_MOVED_NO;
else if (!strcmp(arg, "plain"))
return COLOR_MOVED_PLAIN;
else if (!strcmp(arg, "blocks"))
return COLOR_MOVED_BLOCKS;
else if (!strcmp(arg, "zebra"))
return COLOR_MOVED_ZEBRA;
else if (!strcmp(arg, "default"))
return COLOR_MOVED_DEFAULT;
else if (!strcmp(arg, "dimmed-zebra"))
return COLOR_MOVED_ZEBRA_DIM;
else if (!strcmp(arg, "dimmed_zebra"))
return COLOR_MOVED_ZEBRA_DIM;
else
return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
}
static unsigned parse_color_moved_ws(const char *arg)
{
int ret = 0;
struct string_list l = STRING_LIST_INIT_DUP;
struct string_list_item *i;
string_list_split(&l, arg, ',', -1);
for_each_string_list_item(i, &l) {
struct strbuf sb = STRBUF_INIT;
strbuf_addstr(&sb, i->string);
strbuf_trim(&sb);
if (!strcmp(sb.buf, "no"))
ret = 0;
else if (!strcmp(sb.buf, "ignore-space-change"))
ret |= XDF_IGNORE_WHITESPACE_CHANGE;
else if (!strcmp(sb.buf, "ignore-space-at-eol"))
ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
else if (!strcmp(sb.buf, "ignore-all-space"))
ret |= XDF_IGNORE_WHITESPACE;
else if (!strcmp(sb.buf, "allow-indentation-change"))
ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
else {
ret |= COLOR_MOVED_WS_ERROR;
error(_("unknown color-moved-ws mode '%s', possible values are 'ignore-space-change', 'ignore-space-at-eol', 'ignore-all-space', 'allow-indentation-change'"), sb.buf);
}
strbuf_release(&sb);
}
if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
(ret & XDF_WHITESPACE_FLAGS)) {
error(_("color-moved-ws: allow-indentation-change cannot be combined with other whitespace modes"));
ret |= COLOR_MOVED_WS_ERROR;
}
string_list_clear(&l, 0);
return ret;
}
int git_diff_ui_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
diff_use_color_default = git_config_colorbool(var, value);
return 0;
}
if (!strcmp(var, "diff.colormoved")) {
int cm = parse_color_moved(value);
if (cm < 0)
return -1;
diff_color_moved_default = cm;
return 0;
}
if (!strcmp(var, "diff.colormovedws")) {
unsigned cm = parse_color_moved_ws(value);
if (cm & COLOR_MOVED_WS_ERROR)
return -1;
diff_color_moved_ws_default = cm;
return 0;
}
if (!strcmp(var, "diff.context")) {
diff_context_default = git_config_int(var, value);
if (diff_context_default < 0)
return -1;
return 0;
}
if (!strcmp(var, "diff.interhunkcontext")) {
diff_interhunk_context_default = git_config_int(var, value);
if (diff_interhunk_context_default < 0)
return -1;
return 0;
}
if (!strcmp(var, "diff.renames")) {
diff_detect_rename_default = git_config_rename(var, value);
return 0;
}
if (!strcmp(var, "diff.autorefreshindex")) {
diff_auto_refresh_index = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "diff.mnemonicprefix")) {
diff_mnemonic_prefix = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "diff.noprefix")) {
diff_no_prefix = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "diff.statgraphwidth")) {
diff_stat_graph_width = git_config_int(var, value);
return 0;
}
if (!strcmp(var, "diff.external"))
return git_config_string(&external_diff_cmd_cfg, var, value);
if (!strcmp(var, "diff.wordregex"))
return git_config_string(&diff_word_regex_cfg, var, value);
if (!strcmp(var, "diff.orderfile"))
return git_config_pathname(&diff_order_file_cfg, var, value);
if (!strcmp(var, "diff.ignoresubmodules"))
handle_ignore_submodules_arg(&default_diff_options, value);
if (!strcmp(var, "diff.submodule")) {
if (parse_submodule_params(&default_diff_options, value))
warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
value);
return 0;
}
if (!strcmp(var, "diff.algorithm")) {
diff_algorithm = parse_algorithm_value(value);
if (diff_algorithm < 0)
return -1;
return 0;
}
if (!strcmp(var, "diff.wserrorhighlight")) {
int val = parse_ws_error_highlight(value);
if (val < 0)
return -1;
ws_error_highlight_default = val;
return 0;
}
if (git_color_config(var, value, cb) < 0)
return -1;
return git_diff_basic_config(var, value, cb);
}
int git_diff_basic_config(const char *var, const char *value, void *cb)
{
const char *name;
if (!strcmp(var, "diff.renamelimit")) {
diff_rename_limit_default = git_config_int(var, value);
return 0;
}
if (userdiff_config(var, value) < 0)
return -1;
if (skip_prefix(var, "diff.color.", &name) ||
skip_prefix(var, "color.diff.", &name)) {
int slot = parse_diff_color_slot(name);
if (slot < 0)
return 0;
if (!value)
return config_error_nonbool(var);
return color_parse(value, diff_colors[slot]);
}
/* like GNU diff's --suppress-blank-empty option */
if (!strcmp(var, "diff.suppressblankempty") ||
/* for backwards compatibility */
!strcmp(var, "diff.suppress-blank-empty")) {
diff_suppress_blank_empty = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "diff.dirstat")) {
struct strbuf errmsg = STRBUF_INIT;
default_diff_options.dirstat_permille = diff_dirstat_permille_default;
if (parse_dirstat_params(&default_diff_options, value, &errmsg))
warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
errmsg.buf);
strbuf_release(&errmsg);
diff_dirstat_permille_default = default_diff_options.dirstat_permille;
return 0;
}
if (git_diff_heuristic_config(var, value, cb) < 0)
return -1;
return git_default_config(var, value, cb);
}
static char *quote_two(const char *one, const char *two)
{
int need_one = quote_c_style(one, NULL, NULL, 1);
int need_two = quote_c_style(two, NULL, NULL, 1);
struct strbuf res = STRBUF_INIT;
if (need_one + need_two) {
strbuf_addch(&res, '"');
quote_c_style(one, &res, NULL, 1);
quote_c_style(two, &res, NULL, 1);
strbuf_addch(&res, '"');
} else {
strbuf_addstr(&res, one);
strbuf_addstr(&res, two);
}
return strbuf_detach(&res, NULL);
}
static const char *external_diff(void)
{
static const char *external_diff_cmd = NULL;
static int done_preparing = 0;
if (done_preparing)
return external_diff_cmd;
external_diff_cmd = xstrdup_or_null(getenv("GIT_EXTERNAL_DIFF"));
if (!external_diff_cmd)
external_diff_cmd = external_diff_cmd_cfg;
done_preparing = 1;
return external_diff_cmd;
}
/*
* Keep track of files used for diffing. Sometimes such an entry
* refers to a temporary file, sometimes to an existing file, and
* sometimes to "/dev/null".
*/
static struct diff_tempfile {
/*
* filename external diff should read from, or NULL if this
* entry is currently not in use:
*/
const char *name;
char hex[GIT_MAX_HEXSZ + 1];
char mode[10];
/*
* If this diff_tempfile instance refers to a temporary file,
* this tempfile object is used to manage its lifetime.
*/
struct tempfile *tempfile;
} diff_temp[2];
struct emit_callback {
int color_diff;
unsigned ws_rule;
int blank_at_eof_in_preimage;
int blank_at_eof_in_postimage;
int lno_in_preimage;
int lno_in_postimage;
const char **label_path;
struct diff_words_data *diff_words;
struct diff_options *opt;
struct strbuf *header;
};
static int count_lines(const char *data, int size)
{
int count, ch, completely_empty = 1, nl_just_seen = 0;
count = 0;
while (0 < size--) {
ch = *data++;
if (ch == '\n') {
count++;
nl_just_seen = 1;
completely_empty = 0;
}
else {
nl_just_seen = 0;
completely_empty = 0;
}
}
if (completely_empty)
return 0;
if (!nl_just_seen)
count++; /* no trailing newline */
return count;
}
static int fill_mmfile(struct repository *r, mmfile_t *mf,
struct diff_filespec *one)
{
if (!DIFF_FILE_VALID(one)) {
mf->ptr = (char *)""; /* does not matter */
mf->size = 0;
return 0;
}
else if (diff_populate_filespec(r, one, 0))
return -1;
mf->ptr = one->data;
mf->size = one->size;
return 0;
}
/* like fill_mmfile, but only for size, so we can avoid retrieving blob */
static unsigned long diff_filespec_size(struct repository *r,
struct diff_filespec *one)
{
if (!DIFF_FILE_VALID(one))
return 0;
diff_populate_filespec(r, one, CHECK_SIZE_ONLY);
return one->size;
}
static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
{
char *ptr = mf->ptr;
long size = mf->size;
int cnt = 0;
if (!size)
return cnt;
ptr += size - 1; /* pointing at the very end */
if (*ptr != '\n')
; /* incomplete line */
else
ptr--; /* skip the last LF */
while (mf->ptr < ptr) {
char *prev_eol;
for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
if (*prev_eol == '\n')
break;
if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
break;
cnt++;
ptr = prev_eol - 1;
}
return cnt;
}
static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
struct emit_callback *ecbdata)
{
int l1, l2, at;
unsigned ws_rule = ecbdata->ws_rule;
l1 = count_trailing_blank(mf1, ws_rule);
l2 = count_trailing_blank(mf2, ws_rule);
if (l2 <= l1) {
ecbdata->blank_at_eof_in_preimage = 0;
ecbdata->blank_at_eof_in_postimage = 0;
return;
}
at = count_lines(mf1->ptr, mf1->size);
ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
at = count_lines(mf2->ptr, mf2->size);
ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
}
static void emit_line_0(struct diff_options *o,
const char *set_sign, const char *set, unsigned reverse, const char *reset,
int first, const char *line, int len)
{
int has_trailing_newline, has_trailing_carriage_return;
int needs_reset = 0; /* at the end of the line */
FILE *file = o->file;
fputs(diff_line_prefix(o), file);
has_trailing_newline = (len > 0 && line[len-1] == '\n');
if (has_trailing_newline)
len--;
has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
if (has_trailing_carriage_return)
len--;
if (!len && !first)
goto end_of_line;
if (reverse && want_color(o->use_color)) {
fputs(GIT_COLOR_REVERSE, file);
needs_reset = 1;
}
if (set_sign) {
fputs(set_sign, file);
needs_reset = 1;
}
if (first)
fputc(first, file);
if (!len)
goto end_of_line;
if (set) {
if (set_sign && set != set_sign)
fputs(reset, file);
fputs(set, file);
needs_reset = 1;
}
fwrite(line, len, 1, file);
needs_reset = 1; /* 'line' may contain color codes. */
end_of_line:
if (needs_reset)
fputs(reset, file);
if (has_trailing_carriage_return)
fputc('\r', file);
if (has_trailing_newline)
fputc('\n', file);
}
static void emit_line(struct diff_options *o, const char *set, const char *reset,
const char *line, int len)
{
emit_line_0(o, set, NULL, 0, reset, 0, line, len);
}
enum diff_symbol {
DIFF_SYMBOL_BINARY_DIFF_HEADER,
DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
DIFF_SYMBOL_BINARY_DIFF_BODY,
DIFF_SYMBOL_BINARY_DIFF_FOOTER,
DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
DIFF_SYMBOL_STATS_LINE,
DIFF_SYMBOL_WORD_DIFF,
DIFF_SYMBOL_STAT_SEP,
DIFF_SYMBOL_SUMMARY,
DIFF_SYMBOL_SUBMODULE_ADD,
DIFF_SYMBOL_SUBMODULE_DEL,
DIFF_SYMBOL_SUBMODULE_UNTRACKED,
DIFF_SYMBOL_SUBMODULE_MODIFIED,
DIFF_SYMBOL_SUBMODULE_HEADER,
DIFF_SYMBOL_SUBMODULE_ERROR,
DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
DIFF_SYMBOL_REWRITE_DIFF,
DIFF_SYMBOL_BINARY_FILES,
DIFF_SYMBOL_HEADER,
DIFF_SYMBOL_FILEPAIR_PLUS,
DIFF_SYMBOL_FILEPAIR_MINUS,
DIFF_SYMBOL_WORDS_PORCELAIN,
DIFF_SYMBOL_WORDS,
DIFF_SYMBOL_CONTEXT,
DIFF_SYMBOL_CONTEXT_INCOMPLETE,
DIFF_SYMBOL_PLUS,
DIFF_SYMBOL_MINUS,
DIFF_SYMBOL_NO_LF_EOF,
DIFF_SYMBOL_CONTEXT_FRAGINFO,
DIFF_SYMBOL_CONTEXT_MARKER,
DIFF_SYMBOL_SEPARATOR
};
/*
* Flags for content lines:
* 0..12 are whitespace rules
* 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
* 16 is marking if the line is blank at EOF
*/
#define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
#define DIFF_SYMBOL_MOVED_LINE (1<<17)
#define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
#define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
#define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
/*
* This struct is used when we need to buffer the output of the diff output.
*
* NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
* into the pre/post image file. This pointer could be a union with the
* line pointer. By storing an offset into the file instead of the literal line,
* we can decrease the memory footprint for the buffered output. At first we
* may want to only have indirection for the content lines, but we could also
* enhance the state for emitting prefabricated lines, e.g. the similarity
* score line or hunk/file headers would only need to store a number or path
* and then the output can be constructed later on depending on state.
*/
struct emitted_diff_symbol {
const char *line;
int len;
int flags;
int indent_off; /* Offset to first non-whitespace character */
int indent_width; /* The visual width of the indentation */
enum diff_symbol s;
};
#define EMITTED_DIFF_SYMBOL_INIT {NULL}
struct emitted_diff_symbols {
struct emitted_diff_symbol *buf;
int nr, alloc;
};
#define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
static void append_emitted_diff_symbol(struct diff_options *o,
struct emitted_diff_symbol *e)
{
struct emitted_diff_symbol *f;
ALLOC_GROW(o->emitted_symbols->buf,
o->emitted_symbols->nr + 1,
o->emitted_symbols->alloc);
f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
memcpy(f, e, sizeof(struct emitted_diff_symbol));
f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
}
struct moved_entry {
struct hashmap_entry ent;
const struct emitted_diff_symbol *es;
struct moved_entry *next_line;
};
struct moved_block {
struct moved_entry *match;
int wsd; /* The whitespace delta of this block */
};
static void moved_block_clear(struct moved_block *b)
{
memset(b, 0, sizeof(*b));
}
#define INDENT_BLANKLINE INT_MIN
static void fill_es_indent_data(struct emitted_diff_symbol *es)
{
unsigned int off = 0, i;
int width = 0, tab_width = es->flags & WS_TAB_WIDTH_MASK;
const char *s = es->line;
const int len = es->len;
/* skip any \v \f \r at start of indentation */
while (s[off] == '\f' || s[off] == '\v' ||
(s[off] == '\r' && off < len - 1))
off++;
/* calculate the visual width of indentation */
while(1) {
if (s[off] == ' ') {
width++;
off++;
} else if (s[off] == '\t') {
width += tab_width - (width % tab_width);
while (s[++off] == '\t')
width += tab_width;
} else {
break;
}
}
/* check if this line is blank */
for (i = off; i < len; i++)
if (!isspace(s[i]))
break;
if (i == len) {
es->indent_width = INDENT_BLANKLINE;
es->indent_off = len;
} else {
es->indent_off = off;
es->indent_width = width;
}
}
static int compute_ws_delta(const struct emitted_diff_symbol *a,
const struct emitted_diff_symbol *b,
int *out)
{
int a_len = a->len,
b_len = b->len,
a_off = a->indent_off,
a_width = a->indent_width,
b_off = b->indent_off,
b_width = b->indent_width;
int delta;
if (a_width == INDENT_BLANKLINE && b_width == INDENT_BLANKLINE) {
*out = INDENT_BLANKLINE;
return 1;
}
if (a->s == DIFF_SYMBOL_PLUS)
delta = a_width - b_width;
else
delta = b_width - a_width;
if (a_len - a_off != b_len - b_off ||
memcmp(a->line + a_off, b->line + b_off, a_len - a_off))
return 0;
*out = delta;
return 1;
}
static int cmp_in_block_with_wsd(const struct diff_options *o,
const struct moved_entry *cur,
const struct moved_entry *match,
struct moved_block *pmb,
int n)
{
struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
int al = cur->es->len, bl = match->es->len, cl = l->len;
const char *a = cur->es->line,
*b = match->es->line,
*c = l->line;
int a_off = cur->es->indent_off,
a_width = cur->es->indent_width,
c_off = l->indent_off,
c_width = l->indent_width;
int delta;
/*
* We need to check if 'cur' is equal to 'match'. As those
* are from the same (+/-) side, we do not need to adjust for
* indent changes. However these were found using fuzzy
* matching so we do have to check if they are equal. Here we
* just check the lengths. We delay calling memcmp() to check
* the contents until later as if the length comparison for a
* and c fails we can avoid the call all together.
*/
if (al != bl)
return 1;
/* If 'l' and 'cur' are both blank then they match. */
if (a_width == INDENT_BLANKLINE && c_width == INDENT_BLANKLINE)
return 0;
/*
* The indent changes of the block are known and stored in pmb->wsd;
* however we need to check if the indent changes of the current line
* match those of the current block and that the text of 'l' and 'cur'
* after the indentation match.
*/
if (cur->es->s == DIFF_SYMBOL_PLUS)
delta = a_width - c_width;
else
delta = c_width - a_width;
/*
* If the previous lines of this block were all blank then set its
* whitespace delta.
*/
if (pmb->wsd == INDENT_BLANKLINE)
pmb->wsd = delta;
return !(delta == pmb->wsd && al - a_off == cl - c_off &&
!memcmp(a, b, al) && !
memcmp(a + a_off, c + c_off, al - a_off));
}
static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
const struct hashmap_entry *eptr,
const struct hashmap_entry *entry_or_key,
const void *keydata)
{
const struct diff_options *diffopt = hashmap_cmp_fn_data;
const struct moved_entry *a, *b;
unsigned flags = diffopt->color_moved_ws_handling
& XDF_WHITESPACE_FLAGS;
a = container_of(eptr, const struct moved_entry, ent);
b = container_of(entry_or_key, const struct moved_entry, ent);
if (diffopt->color_moved_ws_handling &
COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
/*
* As there is not specific white space config given,
* we'd need to check for a new block, so ignore all
* white space. The setup of the white space
* configuration for the next block is done else where
*/
flags |= XDF_IGNORE_WHITESPACE;
return !xdiff_compare_lines(a->es->line, a->es->len,
b->es->line, b->es->len,
flags);
}
static struct moved_entry *prepare_entry(struct diff_options *o,
int line_no)
{
struct moved_entry *ret = xmalloc(sizeof(*ret));
struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
unsigned int hash = xdiff_hash_string(l->line, l->len, flags);
hashmap_entry_init(&ret->ent, hash);
ret->es = l;
ret->next_line = NULL;
return ret;
}
static void add_lines_to_move_detection(struct diff_options *o,
struct hashmap *add_lines,
struct hashmap *del_lines)
{
struct moved_entry *prev_line = NULL;
int n;
for (n = 0; n < o->emitted_symbols->nr; n++) {
struct hashmap *hm;
struct moved_entry *key;
switch (o->emitted_symbols->buf[n].s) {
case DIFF_SYMBOL_PLUS:
hm = add_lines;
break;
case DIFF_SYMBOL_MINUS:
hm = del_lines;
break;
default:
prev_line = NULL;
continue;
}
if (o->color_moved_ws_handling &
COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
fill_es_indent_data(&o->emitted_symbols->buf[n]);
key = prepare_entry(o, n);
if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
prev_line->next_line = key;
hashmap_add(hm, &key->ent);
prev_line = key;
}
}
static void pmb_advance_or_null(struct diff_options *o,
struct moved_entry *match,
struct hashmap *hm,
struct moved_block *pmb,
int pmb_nr)
{
int i;
for (i = 0; i < pmb_nr; i++) {
struct moved_entry *prev = pmb[i].match;
struct moved_entry *cur = (prev && prev->next_line) ?
prev->next_line : NULL;
if (cur && !hm->cmpfn(o, &cur->ent, &match->ent, NULL)) {
pmb[i].match = cur;
} else {
pmb[i].match = NULL;
}
}
}
static void pmb_advance_or_null_multi_match(struct diff_options *o,
struct moved_entry *match,
struct hashmap *hm,
struct moved_block *pmb,
int pmb_nr, int n)
{
int i;
char *got_match = xcalloc(1, pmb_nr);
hashmap_for_each_entry_from(hm, match, ent) {
for (i = 0; i < pmb_nr; i++) {
struct moved_entry *prev = pmb[i].match;
struct moved_entry *cur = (prev && prev->next_line) ?
prev->next_line : NULL;
if (!cur)
continue;
if (!cmp_in_block_with_wsd(o, cur, match, &pmb[i], n))
got_match[i] |= 1;
}
}
for (i = 0; i < pmb_nr; i++) {
if (got_match[i]) {
/* Advance to the next line */
pmb[i].match = pmb[i].match->next_line;
} else {
moved_block_clear(&pmb[i]);
}
}
free(got_match);
}
static int shrink_potential_moved_blocks(struct moved_block *pmb,
int pmb_nr)
{
int lp, rp;
/* Shrink the set of potential block to the remaining running */
for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
while (lp < pmb_nr && pmb[lp].match)
lp++;
/* lp points at the first NULL now */
while (rp > -1 && !pmb[rp].match)
rp--;
/* rp points at the last non-NULL */
if (lp < pmb_nr && rp > -1 && lp < rp) {
pmb[lp] = pmb[rp];
memset(&pmb[rp], 0, sizeof(pmb[rp]));
rp--;
lp++;
}
}
/* Remember the number of running sets */
return rp + 1;
}
/*
* If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
*
* Otherwise, if the last block has fewer alphanumeric characters than
* COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
* that block.
*
* The last block consists of the (n - block_length)'th line up to but not
* including the nth line.
*
* Returns 0 if the last block is empty or is unset by this function, non zero
* otherwise.
*
* NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
* Think of a way to unify them.
*/
static int adjust_last_block(struct diff_options *o, int n, int block_length)
{
int i, alnum_count = 0;
if (o->color_moved == COLOR_MOVED_PLAIN)
return block_length;
for (i = 1; i < block_length + 1; i++) {
const char *c = o->emitted_symbols->buf[n - i].line;
for (; *c; c++) {
if (!isalnum(*c))
continue;
alnum_count++;
if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
return 1;
}
}
for (i = 1; i < block_length + 1; i++)
o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
return 0;
}
/* Find blocks of moved code, delegate actual coloring decision to helper */
static void mark_color_as_moved(struct diff_options *o,
struct hashmap *add_lines,
struct hashmap *del_lines)
{
struct moved_block *pmb = NULL; /* potentially moved blocks */
int pmb_nr = 0, pmb_alloc = 0;
int n, flipped_block = 0, block_length = 0;
for (n = 0; n < o->emitted_symbols->nr; n++) {
struct hashmap *hm = NULL;
struct moved_entry *key;
struct moved_entry *match = NULL;
struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
enum diff_symbol last_symbol = 0;
switch (l->s) {
case DIFF_SYMBOL_PLUS:
hm = del_lines;
key = prepare_entry(o, n);
match = hashmap_get_entry(hm, key, ent, NULL);
free(key);
break;
case DIFF_SYMBOL_MINUS:
hm = add_lines;
key = prepare_entry(o, n);
match = hashmap_get_entry(hm, key, ent, NULL);
free(key);
break;
default:
flipped_block = 0;
}
if (!match) {
int i;
adjust_last_block(o, n, block_length);
for(i = 0; i < pmb_nr; i++)
moved_block_clear(&pmb[i]);
pmb_nr = 0;
block_length = 0;
flipped_block = 0;
last_symbol = l->s;
continue;
}
if (o->color_moved == COLOR_MOVED_PLAIN) {
last_symbol = l->s;
l->flags |= DIFF_SYMBOL_MOVED_LINE;
continue;
}
if (o->color_moved_ws_handling &
COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
else
pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
if (pmb_nr == 0) {
/*
* The current line is the start of a new block.
* Setup the set of potential blocks.
*/
hashmap_for_each_entry_from(hm, match, ent) {
ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
if (o->color_moved_ws_handling &
COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
if (compute_ws_delta(l, match->es,
&pmb[pmb_nr].wsd))
pmb[pmb_nr++].match = match;
} else {
pmb[pmb_nr].wsd = 0;
pmb[pmb_nr++].match = match;
}
}
if (adjust_last_block(o, n, block_length) &&
pmb_nr && last_symbol != l->s)
flipped_block = (flipped_block + 1) % 2;
else
flipped_block = 0;
block_length = 0;
}
if (pmb_nr) {
block_length++;
l->flags |= DIFF_SYMBOL_MOVED_LINE;
if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
}
last_symbol = l->s;
}
adjust_last_block(o, n, block_length);
for(n = 0; n < pmb_nr; n++)
moved_block_clear(&pmb[n]);
free(pmb);
}
#define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
(DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
static void dim_moved_lines(struct diff_options *o)
{
int n;
for (n = 0; n < o->emitted_symbols->nr; n++) {
struct emitted_diff_symbol *prev = (n != 0) ?
&o->emitted_symbols->buf[n - 1] : NULL;
struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
struct emitted_diff_symbol *next =
(n < o->emitted_symbols->nr - 1) ?
&o->emitted_symbols->buf[n + 1] : NULL;
/* Not a plus or minus line? */
if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
continue;
/* Not a moved line? */
if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
continue;
/*
* If prev or next are not a plus or minus line,
* pretend they don't exist
*/
if (prev && prev->s != DIFF_SYMBOL_PLUS &&
prev->s != DIFF_SYMBOL_MINUS)
prev = NULL;
if (next && next->s != DIFF_SYMBOL_PLUS &&
next->s != DIFF_SYMBOL_MINUS)
next = NULL;
/* Inside a block? */
if ((prev &&
(prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
(l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
(next &&
(next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
(l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
continue;
}
/* Check if we are at an interesting bound: */
if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
(prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
(l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
continue;
if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
(next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
(l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
continue;
/*
* The boundary to prev and next are not interesting,
* so this line is not interesting as a whole
*/
l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
}
}
static void emit_line_ws_markup(struct diff_options *o,
const char *set_sign, const char *set,
const char *reset,
int sign_index, const char *line, int len,
unsigned ws_rule, int blank_at_eof)
{
const char *ws = NULL;
int sign = o->output_indicators[sign_index];
if (o->ws_error_highlight & ws_rule) {
ws = diff_get_color_opt(o, DIFF_WHITESPACE);
if (!*ws)
ws = NULL;
}
if (!ws && !set_sign)
emit_line_0(o, set, NULL, 0, reset, sign, line, len);
else if (!ws) {
emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
} else if (blank_at_eof)
/* Blank line at EOF - paint '+' as well */
emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
else {
/* Emit just the prefix, then the rest. */
emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
sign, "", 0);
ws_check_emit(line, len, ws_rule,
o->file, set, reset, ws);
}
}
static void emit_diff_symbol_from_struct(struct diff_options *o,
struct emitted_diff_symbol *eds)
{
static const char *nneof = " No newline at end of file\n";
const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
struct strbuf sb = STRBUF_INIT;
enum diff_symbol s = eds->s;
const char *line = eds->line;
int len = eds->len;
unsigned flags = eds->flags;
switch (s) {
case DIFF_SYMBOL_NO_LF_EOF:
context = diff_get_color_opt(o, DIFF_CONTEXT);
reset = diff_get_color_opt(o, DIFF_RESET);
putc('\n', o->file);
emit_line_0(o, context, NULL, 0, reset, '\\',
nneof, strlen(nneof));
break;
case DIFF_SYMBOL_SUBMODULE_HEADER:
case DIFF_SYMBOL_SUBMODULE_ERROR:
case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
case DIFF_SYMBOL_SUMMARY:
case DIFF_SYMBOL_STATS_LINE:
case DIFF_SYMBOL_BINARY_DIFF_BODY:
case DIFF_SYMBOL_CONTEXT_FRAGINFO:
emit_line(o, "", "", line, len);
break;
case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
case DIFF_SYMBOL_CONTEXT_MARKER:
context = diff_get_color_opt(o, DIFF_CONTEXT);
reset = diff_get_color_opt(o, DIFF_RESET);
emit_line(o, context, reset, line, len);
break;
case DIFF_SYMBOL_SEPARATOR:
fprintf(o->file, "%s%c",
diff_line_prefix(o),
o->line_termination);
break;
case DIFF_SYMBOL_CONTEXT:
set = diff_get_color_opt(o, DIFF_CONTEXT);
reset = diff_get_color_opt(o, DIFF_RESET);
set_sign = NULL;
if (o->flags.dual_color_diffed_diffs) {
char c = !len ? 0 : line[0];
if (c == '+')
set = diff_get_color_opt(o, DIFF_FILE_NEW);
else if (c == '@')
set = diff_get_color_opt(o, DIFF_FRAGINFO);
else if (c == '-')
set = diff_get_color_opt(o, DIFF_FILE_OLD);
}
emit_line_ws_markup(o, set_sign, set, reset,
OUTPUT_INDICATOR_CONTEXT, line, len,
flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
break;
case DIFF_SYMBOL_PLUS:
switch (flags & (DIFF_SYMBOL_MOVED_LINE |
DIFF_SYMBOL_MOVED_LINE_ALT |
DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
case DIFF_SYMBOL_MOVED_LINE |
DIFF_SYMBOL_MOVED_LINE_ALT |
DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
break;
case DIFF_SYMBOL_MOVED_LINE |
DIFF_SYMBOL_MOVED_LINE_ALT:
set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
break;
case DIFF_SYMBOL_MOVED_LINE |
DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
break;
case DIFF_SYMBOL_MOVED_LINE:
set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
break;
default:
set = diff_get_color_opt(o, DIFF_FILE_NEW);
}
reset = diff_get_color_opt(o, DIFF_RESET);
if (!o->flags.dual_color_diffed_diffs)
set_sign = NULL;
else {
char c = !len ? 0 : line[0];
set_sign = set;
if (c == '-')
set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
else if (c == '@')
set = diff_get_color_opt(o, DIFF_FRAGINFO);
else if (c == '+')
set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
else
set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
}
emit_line_ws_markup(o, set_sign, set, reset,
OUTPUT_INDICATOR_NEW, line, len,
flags & DIFF_SYMBOL_CONTENT_WS_MASK,
flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
break;
case DIFF_SYMBOL_MINUS:
switch (flags & (DIFF_SYMBOL_MOVED_LINE |
DIFF_SYMBOL_MOVED_LINE_ALT |
DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
case DIFF_SYMBOL_MOVED_LINE |
DIFF_SYMBOL_MOVED_LINE_ALT |
DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
break;
case DIFF_SYMBOL_MOVED_LINE |
DIFF_SYMBOL_MOVED_LINE_ALT:
set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
break;
case DIFF_SYMBOL_MOVED_LINE |
DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
break;
case DIFF_SYMBOL_MOVED_LINE:
set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
break;
default:
set = diff_get_color_opt(o, DIFF_FILE_OLD);
}
reset = diff_get_color_opt(o, DIFF_RESET);
if (!o->flags.dual_color_diffed_diffs)
set_sign = NULL;
else {
char c = !len ? 0 : line[0];
set_sign = set;
if (c == '+')
set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
else if (c == '@')
set = diff_get_color_opt(o, DIFF_FRAGINFO);
else if (c == '-')
set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
else
set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
}
emit_line_ws_markup(o, set_sign, set, reset,
OUTPUT_INDICATOR_OLD, line, len,
flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
break;
case DIFF_SYMBOL_WORDS_PORCELAIN:
context = diff_get_color_opt(o, DIFF_CONTEXT);
reset = diff_get_color_opt(o, DIFF_RESET);
emit_line(o, context, reset, line, len);
fputs("~\n", o->file);
break;
case DIFF_SYMBOL_WORDS:
context = diff_get_color_opt(o, DIFF_CONTEXT);
reset = diff_get_color_opt(o, DIFF_RESET);
/*
* Skip the prefix character, if any. With
* diff_suppress_blank_empty, there may be
* none.
*/
if (line[0] != '\n') {
line++;
len--;
}
emit_line(o, context, reset, line, len);
break;
case DIFF_SYMBOL_FILEPAIR_PLUS:
meta = diff_get_color_opt(o, DIFF_METAINFO);
reset = diff_get_color_opt(o, DIFF_RESET);
fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
line, reset,
strchr(line, ' ') ? "\t" : "");
break;
case DIFF_SYMBOL_FILEPAIR_MINUS:
meta = diff_get_color_opt(o, DIFF_METAINFO);
reset = diff_get_color_opt(o, DIFF_RESET);
fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
line, reset,
strchr(line, ' ') ? "\t" : "");
break;
case DIFF_SYMBOL_BINARY_FILES:
case DIFF_SYMBOL_HEADER:
fprintf(o->file, "%s", line);
break;
case DIFF_SYMBOL_BINARY_DIFF_HEADER:
fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
break;
case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
break;
case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
break;
case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
fputs(diff_line_prefix(o), o->file);
fputc('\n', o->file);
break;
case DIFF_SYMBOL_REWRITE_DIFF:
fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
reset = diff_get_color_opt(o, DIFF_RESET);
emit_line(o, fraginfo, reset, line, len);
break;
case DIFF_SYMBOL_SUBMODULE_ADD:
set = diff_get_color_opt(o, DIFF_FILE_NEW);
reset = diff_get_color_opt(o, DIFF_RESET);
emit_line(o, set, reset, line, len);
break;
case DIFF_SYMBOL_SUBMODULE_DEL:
set = diff_get_color_opt(o, DIFF_FILE_OLD);
reset = diff_get_color_opt(o, DIFF_RESET);
emit_line(o, set, reset, line, len);
break;
case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
fprintf(o->file, "%sSubmodule %s contains untracked content\n",
diff_line_prefix(o), line);
break;
case DIFF_SYMBOL_SUBMODULE_MODIFIED:
fprintf(o->file, "%sSubmodule %s contains modified content\n",
diff_line_prefix(o), line);
break;
case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
emit_line(o, "", "", " 0 files changed\n",
strlen(" 0 files changed\n"));
break;
case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
emit_line(o, "", "", " ...\n", strlen(" ...\n"));
break;
case DIFF_SYMBOL_WORD_DIFF:
fprintf(o->file, "%.*s", len, line);
break;
case DIFF_SYMBOL_STAT_SEP:
fputs(o->stat_sep, o->file);
break;
default:
BUG("unknown diff symbol");
}
strbuf_release(&sb);
}
static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
const char *line, int len, unsigned flags)
{
struct emitted_diff_symbol e = {line, len, flags, 0, 0, s};
if (o->emitted_symbols)
append_emitted_diff_symbol(o, &e);
else
emit_diff_symbol_from_struct(o, &e);
}
void diff_emit_submodule_del(struct diff_options *o, const char *line)
{
emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
}
void diff_emit_submodule_add(struct diff_options *o, const char *line)
{
emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
}
void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
{
emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
path, strlen(path), 0);
}
void diff_emit_submodule_modified(struct diff_options *o, const char *path)
{
emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
path, strlen(path), 0);
}
void diff_emit_submodule_header(struct diff_options *o, const char *header)
{
emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
header, strlen(header), 0);
}
void diff_emit_submodule_error(struct diff_options *o, const char *err)
{
emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
}
void diff_emit_submodule_pipethrough(struct diff_options *o,
const char *line, int len)
{
emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
}
static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
{
if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
ecbdata->blank_at_eof_in_preimage &&
ecbdata->blank_at_eof_in_postimage &&
ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
return 0;
return ws_blank_line(line, len, ecbdata->ws_rule);
}
static void emit_add_line(struct emit_callback *ecbdata,
const char *line, int len)
{
unsigned flags = WSEH_NEW | ecbdata->ws_rule;
if (new_blank_line_at_eof(ecbdata, line, len))
flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
}
static void emit_del_line(struct emit_callback *ecbdata,
const char *line, int len)
{
unsigned flags = WSEH_OLD | ecbdata->ws_rule;
emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
}
static void emit_context_line(struct emit_callback *ecbdata,
const char *line, int len)
{
unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
}
static void emit_hunk_header(struct emit_callback *ecbdata,
const char *line, int len)
{
const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
static const char atat[2] = { '@', '@' };
const char *cp, *ep;
struct strbuf msgbuf = STRBUF_INIT;
int org_len = len;
int i = 1;
/*
* As a hunk header must begin with "@@ -<old>, +<new> @@",
* it always is at least 10 bytes long.
*/
if (len < 10 ||
memcmp(line, atat, 2) ||
!(ep = memmem(line + 2, len - 2, atat, 2))) {
emit_diff_symbol(ecbdata->opt,
DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
return;
}
ep += 2; /* skip over @@ */
/* The hunk header in fraginfo color */
if (ecbdata->opt->flags.dual_color_diffed_diffs)
strbuf_addstr(&msgbuf, reverse);
strbuf_addstr(&msgbuf, frag);
if (ecbdata->opt->flags.suppress_hunk_header_line_count)
strbuf_add(&msgbuf, atat, sizeof(atat));
else
strbuf_add(&msgbuf, line, ep - line);
strbuf_addstr(&msgbuf, reset);
/*
* trailing "\r\n"
*/
for ( ; i < 3; i++)
if (line[len - i] == '\r' || line[len - i] == '\n')
len--;
/* blank before the func header */
for (cp = ep; ep - line < len; ep++)
if (*ep != ' ' && *ep != '\t')
break;
if (ep != cp) {
strbuf_addstr(&msgbuf, context);
strbuf_add(&msgbuf, cp, ep - cp);
strbuf_addstr(&msgbuf, reset);
}
if (ep < line + len) {
strbuf_addstr(&msgbuf, func);
strbuf_add(&msgbuf, ep, line + len - ep);
strbuf_addstr(&msgbuf, reset);
}
strbuf_add(&msgbuf, line + len, org_len - len);
strbuf_complete_line(&msgbuf);
emit_diff_symbol(ecbdata->opt,
DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
strbuf_release(&msgbuf);
}
static struct diff_tempfile *claim_diff_tempfile(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
if (!diff_temp[i].name)
return diff_temp + i;
BUG("diff is failing to clean up its tempfiles");
}
static void remove_tempfile(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
if (is_tempfile_active(diff_temp[i].tempfile))
delete_tempfile(&diff_temp[i].tempfile);
diff_temp[i].name = NULL;
}
}
static void add_line_count(struct strbuf *out, int count)
{
switch (count) {
case 0:
strbuf_addstr(out, "0,0");
break;
case 1:
strbuf_addstr(out, "1");
break;
default:
strbuf_addf(out, "1,%d", count);
break;
}
}
static void emit_rewrite_lines(struct emit_callback *ecb,
int prefix, const char *data, int size)
{
const char *endp = NULL;
while (0 < size) {
int len;
endp = memchr(data, '\n', size);
len = endp ? (endp - data + 1) : size;
if (prefix != '+') {
ecb->lno_in_preimage++;
emit_del_line(ecb, data, len);
} else {
ecb->lno_in_postimage++;
emit_add_line(ecb, data, len);
}
size -= len;
data += len;
}
if (!endp)
emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
}
static void emit_rewrite_diff(const char *name_a,
const char *name_b,
struct diff_filespec *one,
struct diff_filespec *two,
struct userdiff_driver *textconv_one,
struct userdiff_driver *textconv_two,
struct diff_options *o)
{
int lc_a, lc_b;
static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
const char *a_prefix, *b_prefix;
char *data_one, *data_two;
size_t size_one, size_two;
struct emit_callback ecbdata;
struct strbuf out = STRBUF_INIT;
if (diff_mnemonic_prefix && o->flags.reverse_diff) {
a_prefix = o->b_prefix;
b_prefix = o->a_prefix;
} else {
a_prefix = o->a_prefix;
b_prefix = o->b_prefix;
}
name_a += (*name_a == '/');
name_b += (*name_b == '/');
strbuf_reset(&a_name);
strbuf_reset(&b_name);
quote_two_c_style(&a_name, a_prefix, name_a, 0);
quote_two_c_style(&b_name, b_prefix, name_b, 0);
size_one = fill_textconv(o->repo, textconv_one, one, &data_one);
size_two = fill_textconv(o->repo, textconv_two, two, &data_two);
memset(&ecbdata, 0, sizeof(ecbdata));
ecbdata.color_diff = want_color(o->use_color);
ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
ecbdata.opt = o;
if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
mmfile_t mf1, mf2;
mf1.ptr = (char *)data_one;
mf2.ptr = (char *)data_two;
mf1.size = size_one;
mf2.size = size_two;
check_blank_at_eof(&mf1, &mf2, &ecbdata);
}
ecbdata.lno_in_preimage = 1;
ecbdata.lno_in_postimage = 1;
lc_a = count_lines(data_one, size_one);
lc_b = count_lines(data_two, size_two);
emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
a_name.buf, a_name.len, 0);
emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
b_name.buf, b_name.len, 0);
strbuf_addstr(&out, "@@ -");
if (!o->irreversible_delete)
add_line_count(&out, lc_a);
else
strbuf_addstr(&out, "?,?");
strbuf_addstr(&out, " +");
add_line_count(&out, lc_b);
strbuf_addstr(&out, " @@\n");
emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
strbuf_release(&out);
if (lc_a && !o->irreversible_delete)
emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
if (lc_b)
emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
if (textconv_one)
free((char *)data_one);
if (textconv_two)
free((char *)data_two);
}
struct diff_words_buffer {
mmfile_t text;
unsigned long alloc;
struct diff_words_orig {
const char *begin, *end;
} *orig;
int orig_nr, orig_alloc;
};
static void diff_words_append(char *line, unsigned long len,
struct diff_words_buffer *buffer)
{
ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
line++;
len--;
memcpy(buffer->text.ptr + buffer->text.size, line, len);
buffer->text.size += len;
buffer->text.ptr[buffer->text.size] = '\0';
}
struct diff_words_style_elem {
const char *prefix;
const char *suffix;
const char *color; /* NULL; filled in by the setup code if
* color is enabled */
};
struct diff_words_style {
enum diff_words_type type;
struct diff_words_style_elem new_word, old_word, ctx;
const char *newline;
};
static struct diff_words_style diff_words_styles[] = {
{ DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
{ DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
{ DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
};
struct diff_words_data {
struct diff_words_buffer minus, plus;
const char *current_plus;
int last_minus;
struct diff_options *opt;
regex_t *word_regex;
enum diff_words_type type;
struct diff_words_style *style;
};
static int fn_out_diff_words_write_helper(struct diff_options *o,
struct diff_words_style_elem *st_el,
const char *newline,
size_t count, const char *buf)
{
int print = 0;
struct strbuf sb = STRBUF_INIT;
while (count) {
char *p = memchr(buf, '\n', count);
if (print)
strbuf_addstr(&sb, diff_line_prefix(o));
if (p != buf) {
const char *reset = st_el->color && *st_el->color ?
GIT_COLOR_RESET : NULL;
if (st_el->color && *st_el->color)
strbuf_addstr(&sb, st_el->color);
strbuf_addstr(&sb, st_el->prefix);
strbuf_add(&sb, buf, p ? p - buf : count);
strbuf_addstr(&sb, st_el->suffix);
if (reset)
strbuf_addstr(&sb, reset);
}
if (!p)
goto out;
strbuf_addstr(&sb, newline);
count -= p + 1 - buf;
buf = p + 1;
print = 1;
if (count) {
emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
sb.buf, sb.len, 0);
strbuf_reset(&sb);
}
}
out:
if (sb.len)
emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
sb.buf, sb.len, 0);
strbuf_release(&sb);
return 0;
}
/*
* '--color-words' algorithm can be described as:
*
* 1. collect the minus/plus lines of a diff hunk, divided into
* minus-lines and plus-lines;
*
* 2. break both minus-lines and plus-lines into words and
* place them into two mmfile_t with one word for each line;
*
* 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
*
* And for the common parts of the both file, we output the plus side text.
* diff_words->current_plus is used to trace the current position of the plus file
* which printed. diff_words->last_minus is used to trace the last minus word
* printed.
*
* For '--graph' to work with '--color-words', we need to output the graph prefix
* on each line of color words output. Generally, there are two conditions on
* which we should output the prefix.
*
* 1. diff_words->last_minus == 0 &&
* diff_words->current_plus == diff_words->plus.text.ptr
*
* that is: the plus text must start as a new line, and if there is no minus
* word printed, a graph prefix must be printed.
*
* 2. diff_words->current_plus > diff_words->plus.text.ptr &&
* *(diff_words->current_plus - 1) == '\n'
*
* that is: a graph prefix must be printed following a '\n'
*/
static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
{
if ((diff_words->last_minus == 0 &&
diff_words->current_plus == diff_words->plus.text.ptr) ||
(diff_words->current_plus > diff_words->plus.text.ptr &&
*(diff_words->current_plus - 1) == '\n')) {
return 1;
} else {
return 0;
}
}
static void fn_out_diff_words_aux(void *priv,
long minus_first, long minus_len,
long plus_first, long plus_len,
const char *func, long funclen)
{
struct diff_words_data *diff_words = priv;
struct diff_words_style *style = diff_words->style;
const char *minus_begin, *minus_end, *plus_begin, *plus_end;
struct diff_options *opt = diff_words->opt;
const char *line_prefix;
assert(opt);
line_prefix = diff_line_prefix(opt);
/* POSIX requires that first be decremented by one if len == 0... */
if (minus_len) {
minus_begin = diff_words->minus.orig[minus_first].begin;
minus_end =
diff_words->minus.orig[minus_first + minus_len - 1].end;
} else
minus_begin = minus_end =
diff_words->minus.orig[minus_first].end;
if (plus_len) {
plus_begin = diff_words->plus.orig[plus_first].begin;
plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
} else
plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
if (color_words_output_graph_prefix(diff_words)) {
fputs(line_prefix, diff_words->opt->file);
}
if (diff_words->current_plus != plus_begin) {
fn_out_diff_words_write_helper(diff_words->opt,
&style->ctx, style->newline,
plus_begin - diff_words->current_plus,
diff_words->current_plus);
}
if (minus_begin != minus_end) {
fn_out_diff_words_write_helper(diff_words->opt,
&style->old_word, style->newline,
minus_end - minus_begin, minus_begin);
}
if (plus_begin != plus_end) {
fn_out_diff_words_write_helper(diff_words->opt,
&style->new_word, style->newline,
plus_end - plus_begin, plus_begin);
}
diff_words->current_plus = plus_end;
diff_words->last_minus = minus_first;
}
/* This function starts looking at *begin, and returns 0 iff a word was found. */
static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
int *begin, int *end)
{
if (word_regex && *begin < buffer->size) {
regmatch_t match[1];
if (!regexec_buf(word_regex, buffer->ptr + *begin,
buffer->size - *begin, 1, match, 0)) {
char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
'\n', match[0].rm_eo - match[0].rm_so);
*end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
*begin += match[0].rm_so;
return *begin >= *end;
}
return -1;
}
/* find the next word */
while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
(*begin)++;
if (*begin >= buffer->size)
return -1;
/* find the end of the word */
*end = *begin + 1;
while (*end < buffer->size && !isspace(buffer->ptr[*end]))
(*end)++;
return 0;
}
/*
* This function splits the words in buffer->text, stores the list with
* newline separator into out, and saves the offsets of the original words
* in buffer->orig.
*/
static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
regex_t *word_regex)
{
int i, j;
long alloc = 0;
out->size = 0;
out->ptr = NULL;
/* fake an empty "0th" word */
ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
buffer->orig_nr = 1;
for (i = 0; i < buffer->text.size; i++) {
if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
return;
/* store original boundaries */
ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
buffer->orig_alloc);
buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
buffer->orig_nr++;
/* store one word */
ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
out->ptr[out->size + j - i] = '\n';
out->size += j - i + 1;
i = j - 1;
}
}
/* this executes the word diff on the accumulated buffers */
static void diff_words_show(struct diff_words_data *diff_words)
{
xpparam_t xpp;
xdemitconf_t xecfg;
mmfile_t minus, plus;
struct diff_words_style *style = diff_words->style;
struct diff_options *opt = diff_words->opt;
const char *line_prefix;
assert(opt);
line_prefix = diff_line_prefix(opt);
/* special case: only removal */
if (!diff_words->plus.text.size) {
emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
line_prefix, strlen(line_prefix), 0);
fn_out_diff_words_write_helper(diff_words->opt,
&style->old_word, style->newline,
diff_words->minus.text.size,
diff_words->minus.text.ptr);
diff_words->minus.text.size = 0;
return;
}
diff_words->current_plus = diff_words->plus.text.ptr;
diff_words->last_minus = 0;
memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
xpp.flags = 0;
/* as only the hunk header will be parsed, we need a 0-context */
xecfg.ctxlen = 0;
if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL,
diff_words, &xpp, &xecfg))
die("unable to generate word diff");
free(minus.ptr);
free(plus.ptr);
if (diff_words->current_plus != diff_words->plus.text.ptr +
diff_words->plus.text.size) {
if (color_words_output_graph_prefix(diff_words))
emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
line_prefix, strlen(line_prefix), 0);
fn_out_diff_words_write_helper(diff_words->opt,
&style->ctx, style->newline,
diff_words->plus.text.ptr + diff_words->plus.text.size
- diff_words->current_plus, diff_words->current_plus);
}
diff_words->minus.text.size = diff_words->plus.text.size = 0;
}
/* In "color-words" mode, show word-diff of words accumulated in the buffer */
static void diff_words_flush(struct emit_callback *ecbdata)
{
struct diff_options *wo = ecbdata->diff_words->opt;
if (ecbdata->diff_words->minus.text.size ||
ecbdata->diff_words->plus.text.size)
diff_words_show(ecbdata->diff_words);
if (wo->emitted_symbols) {
struct diff_options *o = ecbdata->opt;
struct emitted_diff_symbols *wol = wo->emitted_symbols;
int i;
/*
* NEEDSWORK:
* Instead of appending each, concat all words to a line?
*/
for (i = 0; i < wol->nr; i++)
append_emitted_diff_symbol(o, &wol->buf[i]);
for (i = 0; i < wol->nr; i++)
free((void *)wol->buf[i].line);
wol->nr = 0;
}
}
static void diff_filespec_load_driver(struct diff_filespec *one,
struct index_state *istate)
{
/* Use already-loaded driver */
if (one->driver)
return;
if (S_ISREG(one->mode))
one->driver = userdiff_find_by_path(istate, one->path);
/* Fallback to default settings */
if (!one->driver)
one->driver = userdiff_find_by_name("default");
}
static const char *userdiff_word_regex(struct diff_filespec *one,
struct index_state *istate)
{
diff_filespec_load_driver(one, istate);
return one->driver->word_regex;
}
static void init_diff_words_data(struct emit_callback *ecbdata,
struct diff_options *orig_opts,
struct diff_filespec *one,
struct diff_filespec *two)
{
int i;
struct diff_options *o = xmalloc(sizeof(struct diff_options));
memcpy(o, orig_opts, sizeof(struct diff_options));
ecbdata->diff_words =
xcalloc(1, sizeof(struct diff_words_data));
ecbdata->diff_words->type = o->word_diff;
ecbdata->diff_words->opt = o;
if (orig_opts->emitted_symbols)
o->emitted_symbols =
xcalloc(1, sizeof(struct emitted_diff_symbols));
if (!o->word_regex)
o->word_regex = userdiff_word_regex(one, o->repo->index);
if (!o->word_regex)
o->word_regex = userdiff_word_regex(two, o->repo->index);
if (!o->word_regex)
o->word_regex = diff_word_regex_cfg;
if (o->word_regex) {
ecbdata->diff_words->word_regex = (regex_t *)
xmalloc(sizeof(regex_t));
if (regcomp(ecbdata->diff_words->word_regex,
o->word_regex,
REG_EXTENDED | REG_NEWLINE))
die("invalid regular expression: %s",
o->word_regex);
}
for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
if (o->word_diff == diff_words_styles[i].type) {
ecbdata->diff_words->style =
&diff_words_styles[i];
break;
}
}
if (want_color(o->use_color)) {
struct diff_words_style *st = ecbdata->diff_words->style;
st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
}
}
static void free_diff_words_data(struct emit_callback *ecbdata)
{
if (ecbdata->diff_words) {
diff_words_flush(ecbdata);
free (ecbdata->diff_words->opt->emitted_symbols);
free (ecbdata->diff_words->opt);
free (ecbdata->diff_words->minus.text.ptr);
free (ecbdata->diff_words->minus.orig);
free (ecbdata->diff_words->plus.text.ptr);
free (ecbdata->diff_words->plus.orig);
if (ecbdata->diff_words->word_regex) {
regfree(ecbdata->diff_words->word_regex);
free(ecbdata->diff_words->word_regex);
}
FREE_AND_NULL(ecbdata->diff_words);
}
}
const char *diff_get_color(int diff_use_color, enum color_diff ix)
{
if (want_color(diff_use_color))
return diff_colors[ix];
return "";
}
const char *diff_line_prefix(struct diff_options *opt)
{
struct strbuf *msgbuf;
if (!opt->output_prefix)
return "";
msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
return msgbuf->buf;
}
static unsigned long sane_truncate_line(char *line, unsigned long len)
{
const char *cp;
unsigned long allot;
size_t l = len;
cp = line;
allot = l;
while (0 < l) {
(void) utf8_width(&cp, &l);
if (!cp)
break; /* truncated in the middle? */
}
return allot - l;
}
static void find_lno(const char *line, struct emit_callback *ecbdata)
{
const char *p;
ecbdata->lno_in_preimage = 0;
ecbdata->lno_in_postimage = 0;
p = strchr(line, '-');
if (!p)
return; /* cannot happen */
ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
p = strchr(p, '+');
if (!p)
return; /* cannot happen */
ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
}
static void fn_out_consume(void *priv, char *line, unsigned long len)
{
struct emit_callback *ecbdata = priv;
struct diff_options *o = ecbdata->opt;
o->found_changes = 1;
if (ecbdata->header) {
emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
ecbdata->header->buf, ecbdata->header->len, 0);
strbuf_reset(ecbdata->header);
ecbdata->header = NULL;
}
if (ecbdata->label_path[0]) {
emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
ecbdata->label_path[0],
strlen(ecbdata->label_path[0]), 0);
emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
ecbdata->label_path[1],
strlen(ecbdata->label_path[1]), 0);
ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
}
if (diff_suppress_blank_empty
&& len == 2 && line[0] == ' ' && line[1] == '\n') {
line[0] = '\n';
len = 1;
}
if (line[0] == '@') {
if (ecbdata->diff_words)
diff_words_flush(ecbdata);
len = sane_truncate_line(line, len);
find_lno(line, ecbdata);
emit_hunk_header(ecbdata, line, len);
return;
}
if (ecbdata->diff_words) {
enum diff_symbol s =
ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
if (line[0] == '-') {
diff_words_append(line, len,
&ecbdata->diff_words->minus);
return;
} else if (line[0] == '+') {
diff_words_append(line, len,
&ecbdata->diff_words->plus);
return;
} else if (starts_with(line, "\\ ")) {
/*
* Eat the "no newline at eof" marker as if we
* saw a "+" or "-" line with nothing on it,
* and return without diff_words_flush() to
* defer processing. If this is the end of
* preimage, more "+" lines may come after it.
*/
return;
}
diff_words_flush(ecbdata);
emit_diff_symbol(o, s, line, len, 0);
return;
}
switch (line[0]) {
case '+':
ecbdata->lno_in_postimage++;
emit_add_line(ecbdata, line + 1, len - 1);
break;
case '-':
ecbdata->lno_in_preimage++;
emit_del_line(ecbdata, line + 1, len - 1);
break;
case ' ':
ecbdata->lno_in_postimage++;
ecbdata->lno_in_preimage++;
emit_context_line(ecbdata, line + 1, len - 1);
break;
default:
/* incomplete line at the end */
ecbdata->lno_in_preimage++;
emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
line, len, 0);
break;
}
}
static void pprint_rename(struct strbuf *name, const char *a, const char *b)
{
const char *old_name = a;
const char *new_name = b;
int pfx_length, sfx_length;
int pfx_adjust_for_slash;
int len_a = strlen(a);
int len_b = strlen(b);
int a_midlen, b_midlen;
int qlen_a = quote_c_style(a, NULL, NULL, 0);
int qlen_b = quote_c_style(b, NULL, NULL, 0);
if (qlen_a || qlen_b) {
quote_c_style(a, name, NULL, 0);
strbuf_addstr(name, " => ");
quote_c_style(b, name, NULL, 0);
return;
}
/* Find common prefix */
pfx_length = 0;
while (*old_name && *new_name && *old_name == *new_name) {
if (*old_name == '/')
pfx_length = old_name - a + 1;
old_name++;
new_name++;
}
/* Find common suffix */
old_name = a + len_a;
new_name = b + len_b;
sfx_length = 0;
/*
* If there is a common prefix, it must end in a slash. In
* that case we let this loop run 1 into the prefix to see the
* same slash.
*
* If there is no common prefix, we cannot do this as it would
* underrun the input strings.
*/
pfx_adjust_for_slash = (pfx_length ? 1 : 0);
while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
b + pfx_length - pfx_adjust_for_slash <= new_name &&
*old_name == *new_name) {
if (*old_name == '/')
sfx_length = len_a - (old_name - a);
old_name--;
new_name--;
}
/*
* pfx{mid-a => mid-b}sfx
* {pfx-a => pfx-b}sfx
* pfx{sfx-a => sfx-b}
* name-a => name-b
*/
a_midlen = len_a - pfx_length - sfx_length;
b_midlen = len_b - pfx_length - sfx_length;
if (a_midlen < 0)
a_midlen = 0;
if (b_midlen < 0)
b_midlen = 0;
strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
if (pfx_length + sfx_length) {
strbuf_add(name, a, pfx_length);
strbuf_addch(name, '{');
}
strbuf_add(name, a + pfx_length, a_midlen);
strbuf_addstr(name, " => ");
strbuf_add(name, b + pfx_length, b_midlen);
if (pfx_length + sfx_length) {
strbuf_addch(name, '}');
strbuf_add(name, a + len_a - sfx_length, sfx_length);
}
}
static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
const char *name_a,
const char *name_b)
{
struct diffstat_file *x;
x = xcalloc(1, sizeof(*x));
ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
diffstat->files[diffstat->nr++] = x;
if (name_b) {
x->from_name = xstrdup(name_a);
x->name = xstrdup(name_b);
x->is_renamed = 1;
}
else {
x->from_name = NULL;
x->name = xstrdup(name_a);
}
return x;
}
static void diffstat_consume(void *priv, char *line, unsigned long len)
{
struct diffstat_t *diffstat = priv;
struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
if (line[0] == '+')
x->added++;
else if (line[0] == '-')
x->deleted++;
}
const char mime_boundary_leader[] = "------------";
static int scale_linear(int it, int width, int max_change)
{
if (!it)
return 0;
/*
* make sure that at least one '-' or '+' is printed if
* there is any change to this path. The easiest way is to
* scale linearly as if the alloted width is one column shorter
* than it is, and then add 1 to the result.
*/
return 1 + (it * (width - 1) / max_change);
}
static void show_graph(struct strbuf *out, char ch, int cnt,
const char *set, const char *reset)
{
if (cnt <= 0)
return;
strbuf_addstr(out, set);
strbuf_addchars(out, ch, cnt);
strbuf_addstr(out, reset);
}
static void fill_print_name(struct diffstat_file *file)
{
struct strbuf pname = STRBUF_INIT;
if (file->print_name)
return;
if (file->is_renamed)
pprint_rename(&pname, file->from_name, file->name);
else
quote_c_style(file->name, &pname, NULL, 0);
if (file->comments)
strbuf_addf(&pname, " (%s)", file->comments);
file->print_name = strbuf_detach(&pname, NULL);
}
static void print_stat_summary_inserts_deletes(struct diff_options *options,
int files, int insertions, int deletions)
{
struct strbuf sb = STRBUF_INIT;
if (!files) {
assert(insertions == 0 && deletions == 0);
emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
NULL, 0, 0);
return;
}
strbuf_addf(&sb,
(files == 1) ? " %d file changed" : " %d files changed",
files);
/*
* For binary diff, the caller may want to print "x files
* changed" with insertions == 0 && deletions == 0.
*
* Not omitting "0 insertions(+), 0 deletions(-)" in this case
* is probably less confusing (i.e skip over "2 files changed
* but nothing about added/removed lines? Is this a bug in Git?").
*/
if (insertions || deletions == 0) {
strbuf_addf(&sb,
(insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
insertions);
}
if (deletions || insertions == 0) {
strbuf_addf(&sb,
(deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
deletions);
}
strbuf_addch(&sb, '\n');
emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
sb.buf, sb.len, 0);
strbuf_release(&sb);
}
void print_stat_summary(FILE *fp, int files,
int insertions, int deletions)
{
struct diff_options o;
memset(&o, 0, sizeof(o));
o.file = fp;
print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
}
static void show_stats(struct diffstat_t *data, struct diff_options *options)
{
int i, len, add, del, adds = 0, dels = 0;
uintmax_t max_change = 0, max_len = 0;
int total_files = data->nr, count;
int width, name_width, graph_width, number_width = 0, bin_width = 0;
const char *reset, *add_c, *del_c;
int extra_shown = 0;
const char *line_prefix = diff_line_prefix(options);
struct strbuf out = STRBUF_INIT;
if (data->nr == 0)
return;
count = options->stat_count ? options->stat_count : data->nr;
reset = diff_get_color_opt(options, DIFF_RESET);
add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
/*
* Find the longest filename and max number of changes
*/
for (i = 0; (i < count) && (i < data->nr); i++) {
struct diffstat_file *file = data->files[i];
uintmax_t change = file->added + file->deleted;
if (!file->is_interesting && (change == 0)) {
count++; /* not shown == room for one more */
continue;
}
fill_print_name(file);
len = strlen(file->print_name);
if (max_len < len)
max_len = len;
if (file->is_unmerged) {
/* "Unmerged" is 8 characters */
bin_width = bin_width < 8 ? 8 : bin_width;
continue;
}
if (file->is_binary) {
/* "Bin XXX -> YYY bytes" */
int w = 14 + decimal_width(file->added)
+ decimal_width(file->deleted);
bin_width = bin_width < w ? w : bin_width;
/* Display change counts aligned with "Bin" */
number_width = 3;
continue;
}
if (max_change < change)
max_change = change;
}
count = i; /* where we can stop scanning in data->files[] */
/*
* We have width = stat_width or term_columns() columns total.
* We want a maximum of min(max_len, stat_name_width) for the name part.
* We want a maximum of min(max_change, stat_graph_width) for the +- part.
* We also need 1 for " " and 4 + decimal_width(max_change)
* for " | NNNN " and one the empty column at the end, altogether
* 6 + decimal_width(max_change).
*
* If there's not enough space, we will use the smaller of
* stat_name_width (if set) and 5/8*width for the filename,
* and the rest for constant elements + graph part, but no more
* than stat_graph_width for the graph part.
* (5/8 gives 50 for filename and 30 for the constant parts + graph
* for the standard terminal size).
*
* In other words: stat_width limits the maximum width, and
* stat_name_width fixes the maximum width of the filename,
* and is also used to divide available columns if there
* aren't enough.
*
* Binary files are displayed with "Bin XXX -> YYY bytes"
* instead of the change count and graph. This part is treated
* similarly to the graph part, except that it is not
* "scaled". If total width is too small to accommodate the
* guaranteed minimum width of the filename part and the
* separators and this message, this message will "overflow"
* making the line longer than the maximum width.
*/
if (options->stat_width == -1)
width = term_columns() - strlen(line_prefix);
else
width = options->stat_width ? options->stat_width : 80;
number_width = decimal_width(max_change) > number_width ?
decimal_width(max_change) : number_width;
if (options->stat_graph_width == -1)
options->stat_graph_width = diff_stat_graph_width;
/*
* Guarantee 3/8*16==6 for the graph part
* and 5/8*16==10 for the filename part
*/
if (width < 16 + 6 + number_width)
width = 16 + 6 + number_width;
/*
* First assign sizes that are wanted, ignoring available width.
* strlen("Bin XXX -> YYY bytes") == bin_width, and the part
* starting from "XXX" should fit in graph_width.
*/
graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
if (options->stat_graph_width &&
options->stat_graph_width < graph_width)
graph_width = options->stat_graph_width;
name_width = (options->stat_name_width > 0 &&
options->stat_name_width < max_len) ?
options->stat_name_width : max_len;
/*
* Adjust adjustable widths not to exceed maximum width
*/
if (name_width + number_width + 6 + graph_width > width) {
if (graph_width > width * 3/8 - number_width - 6) {
graph_width = width * 3/8 - number_width - 6;
if (graph_width < 6)
graph_width = 6;
}
if (options->stat_graph_width &&
graph_width > options->stat_graph_width)
graph_width = options->stat_graph_width;
if (name_width > width - number_width - 6 - graph_width)
name_width = width - number_width - 6 - graph_width;
else
graph_width = width - number_width - 6 - name_width;
}
/*
* From here name_width is the width of the name area,
* and graph_width is the width of the graph area.
* max_change is used to scale graph properly.
*/
for (i = 0; i < count; i++) {
const char *prefix = "";
struct diffstat_file *file = data->files[i];
char *name = file->print_name;
uintmax_t added = file->added;
uintmax_t deleted = file->deleted;
int name_len;
if (!file->is_interesting && (added + deleted == 0))
continue;
/*
* "scale" the filename
*/
len = name_width;
name_len = strlen(name);
if (name_width < name_len) {
char *slash;
prefix = "...";
len -= 3;
name += name_len - len;
slash = strchr(name, '/');
if (slash)
name = slash;
}
if (file->is_binary) {
strbuf_addf(&out, " %s%-*s |", prefix, len, name);
strbuf_addf(&out, " %*s", number_width, "Bin");
if (!added && !deleted) {
strbuf_addch(&out, '\n');
emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
out.buf, out.len, 0);
strbuf_reset(&out);
continue;
}
strbuf_addf(&out, " %s%"PRIuMAX"%s",
del_c, deleted, reset);
strbuf_addstr(&out, " -> ");
strbuf_addf(&out, "%s%"PRIuMAX"%s",
add_c, added, reset);
strbuf_addstr(&out, " bytes\n");
emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
out.buf, out.len, 0);
strbuf_reset(&out);
continue;
}
else if (file->is_unmerged) {
strbuf_addf(&out, " %s%-*s |", prefix, len, name);
strbuf_addstr(&out, " Unmerged\n");
emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
out.buf, out.len, 0);
strbuf_reset(&out);
continue;
}
/*
* scale the add/delete
*/
add = added;
del = deleted;
if (graph_width <= max_change) {
int total = scale_linear(add + del, graph_width, max_change);
if (total < 2 && add && del)
/* width >= 2 due to the sanity check */
total = 2;
if (add < del) {
add = scale_linear(add, graph_width, max_change);
del = total - add;
} else {
del = scale_linear(del, graph_width, max_change);
add = total - del;
}
}
strbuf_addf(&out, " %s%-*s |", prefix, len, name);
strbuf_addf(&out, " %*"PRIuMAX"%s",
number_width, added + deleted,
added + deleted ? " " : "");
show_graph(&out, '+', add, add_c, reset);
show_graph(&out, '-', del, del_c, reset);
strbuf_addch(&out, '\n');
emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
out.buf, out.len, 0);
strbuf_reset(&out);
}
for (i = 0; i < data->nr; i++) {
struct diffstat_file *file = data->files[i];
uintmax_t added = file->added;
uintmax_t deleted = file->deleted;
if (file->is_unmerged ||
(!file->is_interesting && (added + deleted == 0))) {
total_files--;
continue;
}
if (!file->is_binary) {
adds += added;
dels += deleted;
}
if (i < count)
continue;
if (!extra_shown)
emit_diff_symbol(options,
DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
NULL, 0, 0);
extra_shown = 1;
}
print_stat_summary_inserts_deletes(options, total_files, adds, dels);
strbuf_release(&out);
}
static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
{
int i, adds = 0, dels = 0, total_files = data->nr;
if (data->nr == 0)
return;
for (i = 0; i < data->nr; i++) {
int added = data->files[i]->added;
int deleted = data->files[i]->deleted;
if (data->files[i]->is_unmerged ||
(!data->files[i]->is_interesting && (added + deleted == 0))) {
total_files--;
} else if (!data->files[i]->is_binary) { /* don't count bytes */
adds += added;
dels += deleted;
}
}
print_stat_summary_inserts_deletes(options, total_files, adds, dels);
}
static void show_numstat(struct diffstat_t *data, struct diff_options *options)
{
int i;
if (data->nr == 0)
return;
for (i = 0; i < data->nr; i++) {
struct diffstat_file *file = data->files[i];
fprintf(options->file, "%s", diff_line_prefix(options));
if (file->is_binary)
fprintf(options->file, "-\t-\t");
else
fprintf(options->file,
"%"PRIuMAX"\t%"PRIuMAX"\t",
file->added, file->deleted);
if (options->line_termination) {
fill_print_name(file);
if (!file->is_renamed)
write_name_quoted(file->name, options->file,
options->line_termination);
else {
fputs(file->print_name, options->file);
putc(options->line_termination, options->file);
}
} else {
if (file->is_renamed) {
putc('\0', options->file);
write_name_quoted(file->from_name, options->file, '\0');
}
write_name_quoted(file->name, options->file, '\0');
}
}
}
struct dirstat_file {
const char *name;
unsigned long changed;
};
struct dirstat_dir {
struct dirstat_file *files;
int alloc, nr, permille, cumulative;
};
static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
unsigned long changed, const char *base, int baselen)
{
unsigned long sum_changes = 0;
unsigned int sources = 0;
const char *line_prefix = diff_line_prefix(opt);
while (dir->nr) {
struct dirstat_file *f = dir->files;
int namelen = strlen(f->name);
unsigned long changes;
char *slash;
if (namelen < baselen)
break;
if (memcmp(f->name, base, baselen))
break;
slash = strchr(f->name + baselen, '/');
if (slash) {
int newbaselen = slash + 1 - f->name;
changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
sources++;
} else {
changes = f->changed;
dir->files++;
dir->nr--;
sources += 2;
}
sum_changes += changes;
}
/*
* We don't report dirstat's for
* - the top level
* - or cases where everything came from a single directory
* under this directory (sources == 1).
*/
if (baselen && sources != 1) {
if (sum_changes) {
int permille = sum_changes * 1000 / changed;
if (permille >= dir->permille) {
fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
permille / 10, permille % 10, baselen, base);
if (!dir->cumulative)
return 0;
}
}
}
return sum_changes;
}
static int dirstat_compare(const void *_a, const void *_b)
{
const struct dirstat_file *a = _a;
const struct dirstat_file *b = _b;
return strcmp(a->name, b->name);
}
static void show_dirstat(struct diff_options *options)
{
int i;
unsigned long changed;
struct dirstat_dir dir;
struct diff_queue_struct *q = &diff_queued_diff;
dir.files = NULL;
dir.alloc = 0;
dir.nr = 0;
dir.permille = options->dirstat_permille;
dir.cumulative = options->flags.dirstat_cumulative;
changed = 0;
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
const char *name;
unsigned long copied, added, damage;
name = p->two->path ? p->two->path : p->one->path;
if (p->one->oid_valid && p->two->oid_valid &&
oideq(&p->one->oid, &p->two->oid)) {
/*
* The SHA1 has not changed, so pre-/post-content is
* identical. We can therefore skip looking at the
* file contents altogether.
*/
damage = 0;
goto found_damage;
}
if (options->flags.dirstat_by_file) {
/*
* In --dirstat-by-file mode, we don't really need to
* look at the actual file contents at all.
* The fact that the SHA1 changed is enough for us to
* add this file to the list of results
* (with each file contributing equal damage).
*/
damage = 1;
goto found_damage;
}
if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
diff_populate_filespec(options->repo, p->one, 0);
diff_populate_filespec(options->repo, p->two, 0);
diffcore_count_changes(options->repo,
p->one, p->two, NULL, NULL,
&copied, &added);
diff_free_filespec_data(p->one);
diff_free_filespec_data(p->two);
} else if (DIFF_FILE_VALID(p->one)) {
diff_populate_filespec(options->repo, p->one, CHECK_SIZE_ONLY);
copied = added = 0;
diff_free_filespec_data(p->one);
} else if (DIFF_FILE_VALID(p->two)) {
diff_populate_filespec(options->repo, p->two, CHECK_SIZE_ONLY);
copied = 0;
added = p->two->size;
diff_free_filespec_data(p->two);
} else
continue;
/*
* Original minus copied is the removed material,
* added is the new material. They are both damages
* made to the preimage.
* If the resulting damage is zero, we know that
* diffcore_count_changes() considers the two entries to
* be identical, but since the oid changed, we
* know that there must have been _some_ kind of change,
* so we force all entries to have damage > 0.
*/
damage = (p->one->size - copied) + added;
if (!damage)
damage = 1;
found_damage:
ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
dir.files[dir.nr].name = name;
dir.files[dir.nr].changed = damage;
changed += damage;
dir.nr++;
}
/* This can happen even with many files, if everything was renames */
if (!changed)
return;
/* Show all directories with more than x% of the changes */
QSORT(dir.files, dir.nr, dirstat_compare);
gather_dirstat(options, &dir, changed, "", 0);
}
static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
{
int i;
unsigned long changed;
struct dirstat_dir dir;
if (data->nr == 0)
return;
dir.files = NULL;
dir.alloc = 0;
dir.nr = 0;
dir.permille = options->dirstat_permille;
dir.cumulative = options->flags.dirstat_cumulative;
changed = 0;
for (i = 0; i < data->nr; i++) {
struct diffstat_file *file = data->files[i];
unsigned long damage = file->added + file->deleted;
if (file->is_binary)
/*
* binary files counts bytes, not lines. Must find some
* way to normalize binary bytes vs. textual lines.
* The following heuristic assumes that there are 64
* bytes per "line".
* This is stupid and ugly, but very cheap...
*/
damage = DIV_ROUND_UP(damage, 64);
ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
dir.files[dir.nr].name = file->name;
dir.files[dir.nr].changed = damage;
changed += damage;
dir.nr++;
}
/* This can happen even with many files, if everything was renames */
if (!changed)
return;
/* Show all directories with more than x% of the changes */
QSORT(dir.files, dir.nr, dirstat_compare);
gather_dirstat(options, &dir, changed, "", 0);
}
void free_diffstat_info(struct diffstat_t *diffstat)
{
int i;
for (i = 0; i < diffstat->nr; i++) {
struct diffstat_file *f = diffstat->files[i];
free(f->print_name);
free(f->name);
free(f->from_name);
free(f);
}
free(diffstat->files);
}
struct checkdiff_t {
const char *filename;
int lineno;
int conflict_marker_size;
struct diff_options *o;
unsigned ws_rule;
unsigned status;
};
static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
{
char firstchar;
int cnt;
if (len < marker_size + 1)
return 0;
firstchar = line[0];
switch (firstchar) {
case '=': case '>': case '<': case '|':
break;
default:
return 0;
}
for (cnt = 1; cnt < marker_size; cnt++)
if (line[cnt] != firstchar)
return 0;
/* line[1] thru line[marker_size-1] are same as firstchar */
if (len < marker_size + 1 || !isspace(line[marker_size]))
return 0;
return 1;
}
static void checkdiff_consume_hunk(void *priv,
long ob, long on, long nb, long nn,
const char *func, long funclen)
{
struct checkdiff_t *data = priv;
data->lineno = nb - 1;
}
static void checkdiff_consume(void *priv, char *line, unsigned long len)
{
struct checkdiff_t *data = priv;
int marker_size = data->conflict_marker_size;
const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
char *err;
const char *line_prefix;
assert(data->o);
line_prefix = diff_line_prefix(data->o);
if (line[0] == '+') {
unsigned bad;
data->lineno++;
if (is_conflict_marker(line + 1, marker_size, len - 1)) {
data->status |= 1;
fprintf(data->o->file,
"%s%s:%d: leftover conflict marker\n",
line_prefix, data->filename, data->lineno);
}
bad = ws_check(line + 1, len - 1, data->ws_rule);
if (!bad)
return;
data->status |= bad;
err = whitespace_error_string(bad);
fprintf(data->o->file, "%s%s:%d: %s.\n",
line_prefix, data->filename, data->lineno, err);
free(err);
emit_line(data->o, set, reset, line, 1);
ws_check_emit(line + 1, len - 1, data->ws_rule,
data->o->file, set, reset, ws);
} else if (line[0] == ' ') {
data->lineno++;
}
}
static unsigned char *deflate_it(char *data,
unsigned long size,
unsigned long *result_size)
{
int bound;
unsigned char *deflated;
git_zstream stream;
git_deflate_init(&stream, zlib_compression_level);
bound = git_deflate_bound(&stream, size);
deflated = xmalloc(bound);
stream.next_out = deflated;
stream.avail_out = bound;
stream.next_in = (unsigned char *)data;
stream.avail_in = size;
while (git_deflate(&stream, Z_FINISH) == Z_OK)
; /* nothing */
git_deflate_end(&stream);
*result_size = stream.total_out;
return deflated;
}
static void emit_binary_diff_body(struct diff_options *o,
mmfile_t *one, mmfile_t *two)
{
void *cp;
void *delta;
void *deflated;
void *data;
unsigned long orig_size;
unsigned long delta_size;
unsigned long deflate_size;
unsigned long data_size;
/* We could do deflated delta, or we could do just deflated two,
* whichever is smaller.
*/
delta = NULL;
deflated = deflate_it(two->ptr, two->size, &deflate_size);
if (one->size && two->size) {
delta = diff_delta(one->ptr, one->size,
two->ptr, two->size,
&delta_size, deflate_size);
if (delta) {
void *to_free = delta;
orig_size = delta_size;
delta = deflate_it(delta, delta_size, &delta_size);
free(to_free);
}
}
if (delta && delta_size < deflate_size) {
char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
s, strlen(s), 0);
free(s);
free(deflated);
data = delta;
data_size = delta_size;
} else {
char *s = xstrfmt("%lu", two->size);
emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
s, strlen(s), 0);
free(s);
free(delta);
data = deflated;
data_size = deflate_size;
}
/* emit data encoded in base85 */
cp = data;
while (data_size) {
int len;
int bytes = (52 < data_size) ? 52 : data_size;
char line[71];
data_size -= bytes;
if (bytes <= 26)
line[0] = bytes + 'A' - 1;
else
line[0] = bytes - 26 + 'a' - 1;
encode_85(line + 1, cp, bytes);
cp = (char *) cp + bytes;
len = strlen(line);
line[len++] = '\n';
line[len] = '\0';
emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
line, len, 0);
}
emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
free(data);
}
static void emit_binary_diff(struct diff_options *o,
mmfile_t *one, mmfile_t *two)
{
emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
emit_binary_diff_body(o, one, two);
emit_binary_diff_body(o, two, one);
}
int diff_filespec_is_binary(struct repository *r,
struct diff_filespec *one)
{
if (one->is_binary == -1) {
diff_filespec_load_driver(one, r->index);
if (one->driver->binary != -1)
one->is_binary = one->driver->binary;
else {
if (!one->data && DIFF_FILE_VALID(one))
diff_populate_filespec(r, one, CHECK_BINARY);
if (one->is_binary == -1 && one->data)
one->is_binary = buffer_is_binary(one->data,
one->size);
if (one->is_binary == -1)
one->is_binary = 0;
}
}
return one->is_binary;
}
static const struct userdiff_funcname *
diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
{
diff_filespec_load_driver(one, o->repo->index);
return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
}
void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
{
if (!options->a_prefix)
options->a_prefix = a;
if (!options->b_prefix)
options->b_prefix = b;
}
struct userdiff_driver *get_textconv(struct repository *r,
struct diff_filespec *one)
{
if (!DIFF_FILE_VALID(one))
return NULL;
diff_filespec_load_driver(one, r->index);
return userdiff_get_textconv(r, one->driver);
}
static void builtin_diff(const char *name_a,
const char *name_b,
struct diff_filespec *one,
struct diff_filespec *two,
const char *xfrm_msg,
int must_show_header,
struct diff_options *o,
int complete_rewrite)
{
mmfile_t mf1, mf2;
const char *lbl[2];
char *a_one, *b_two;
const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
const char *reset = diff_get_color_opt(o, DIFF_RESET);
const char *a_prefix, *b_prefix;
struct userdiff_driver *textconv_one = NULL;
struct userdiff_driver *textconv_two = NULL;
struct strbuf header = STRBUF_INIT;
const char *line_prefix = diff_line_prefix(o);
diff_set_mnemonic_prefix(o, "a/", "b/");
if (o->flags.reverse_diff) {
a_prefix = o->b_prefix;
b_prefix = o->a_prefix;
} else {
a_prefix = o->a_prefix;
b_prefix = o->b_prefix;
}
if (o->submodule_format == DIFF_SUBMODULE_LOG &&
(!one->mode || S_ISGITLINK(one->mode)) &&
(!two->mode || S_ISGITLINK(two->mode))) {
show_submodule_summary(o, one->path ? one->path : two->path,
&one->oid, &two->oid,
two->dirty_submodule);
return;
} else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
(!one->mode || S_ISGITLINK(one->mode)) &&
(!two->mode || S_ISGITLINK(two->mode))) {
show_submodule_inline_diff(o, one->path ? one->path : two->path,
&one->oid, &two->oid,
two->dirty_submodule);
return;
}
if (o->flags.allow_textconv) {
textconv_one = get_textconv(o->repo, one);
textconv_two = get_textconv(o->repo, two);
}
/* Never use a non-valid filename anywhere if at all possible */
name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
if (lbl[0][0] == '/') {
/* /dev/null */
strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
if (xfrm_msg)
strbuf_addstr(&header, xfrm_msg);
must_show_header = 1;
}
else if (lbl[1][0] == '/') {
strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
if (xfrm_msg)
strbuf_addstr(&header, xfrm_msg);
must_show_header = 1;
}
else {
if (one->mode != two->mode) {
strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
must_show_header = 1;
}
if (xfrm_msg)
strbuf_addstr(&header, xfrm_msg);
/*
* we do not run diff between different kind
* of objects.
*/
if ((one->mode ^ two->mode) & S_IFMT)
goto free_ab_and_return;
if (complete_rewrite &&
(textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
(textconv_two || !diff_filespec_is_binary(o->repo, two))) {
emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
header.buf, header.len, 0);
strbuf_reset(&header);
emit_rewrite_diff(name_a, name_b, one, two,
textconv_one, textconv_two, o);
o->found_changes = 1;
goto free_ab_and_return;
}
}
if (o->irreversible_delete && lbl[1][0] == '/') {
emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
header.len, 0);
strbuf_reset(&header);
goto free_ab_and_return;
} else if (!o->flags.text &&
( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
(!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
struct strbuf sb = STRBUF_INIT;
if (!one->data && !two->data &&
S_ISREG(one->mode) && S_ISREG(two->mode) &&
!o->flags.binary) {
if (oideq(&one->oid, &two->oid)) {
if (must_show_header)
emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
header.buf, header.len,
0);
goto free_ab_and_return;
}
emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
header.buf, header.len, 0);
strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
diff_line_prefix(o), lbl[0], lbl[1]);
emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
sb.buf, sb.len, 0);
strbuf_release(&sb);
goto free_ab_and_return;
}
if (fill_mmfile(o->repo, &mf1, one) < 0 ||
fill_mmfile(o->repo, &mf2, two) < 0)
die("unable to read files to diff");
/* Quite common confusing case */
if (mf1.size == mf2.size &&
!memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
if (must_show_header)
emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
header.buf, header.len, 0);
goto free_ab_and_return;
}
emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
strbuf_reset(&header);
if (o->flags.binary)
emit_binary_diff(o, &mf1, &mf2);
else {
strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
diff_line_prefix(o), lbl[0], lbl[1]);
emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
sb.buf, sb.len, 0);
strbuf_release(&sb);
}
o->found_changes = 1;
} else {
/* Crazy xdl interfaces.. */
const char *diffopts;
const char *v;
xpparam_t xpp;
xdemitconf_t xecfg;
struct emit_callback ecbdata;
const struct userdiff_funcname *pe;
if (must_show_header) {
emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
header.buf, header.len, 0);
strbuf_reset(&header);
}
mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
pe = diff_funcname_pattern(o, one);
if (!pe)
pe = diff_funcname_pattern(o, two);
memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
memset(&ecbdata, 0, sizeof(ecbdata));
if (o->flags.suppress_diff_headers)
lbl[0] = NULL;
ecbdata.label_path = lbl;
ecbdata.color_diff = want_color(o->use_color);
ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
check_blank_at_eof(&mf1, &mf2, &ecbdata);
ecbdata.opt = o;
if (header.len && !o->flags.suppress_diff_headers)
ecbdata.header = &header;
xpp.flags = o->xdl_opts;
xpp.anchors = o->anchors;
xpp.anchors_nr = o->anchors_nr;
xecfg.ctxlen = o->context;
xecfg.interhunkctxlen = o->interhunkcontext;
xecfg.flags = XDL_EMIT_FUNCNAMES;
if (o->flags.funccontext)
xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
if (pe)
xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
diffopts = getenv("GIT_DIFF_OPTS");
if (!diffopts)
;
else if (skip_prefix(diffopts, "--unified=", &v))
xecfg.ctxlen = strtoul(v, NULL, 10);
else if (skip_prefix(diffopts, "-u", &v))
xecfg.ctxlen = strtoul(v, NULL, 10);
if (o->word_diff)
init_diff_words_data(&ecbdata, o, one, two);
if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume,
&ecbdata, &xpp, &xecfg))
die("unable to generate diff for %s", one->path);
if (o->word_diff)
free_diff_words_data(&ecbdata);
if (textconv_one)
free(mf1.ptr);
if (textconv_two)
free(mf2.ptr);
xdiff_clear_find_func(&xecfg);
}
free_ab_and_return:
strbuf_release(&header);
diff_free_filespec_data(one);
diff_free_filespec_data(two);
free(a_one);
free(b_two);
return;
}
static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
{
if (!is_renamed) {
if (p->status == DIFF_STATUS_ADDED) {
if (S_ISLNK(p->two->mode))
return "new +l";
else if ((p->two->mode & 0777) == 0755)
return "new +x";
else
return "new";
} else if (p->status == DIFF_STATUS_DELETED)
return "gone";
}
if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
return "mode -l";
else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
return "mode +l";
else if ((p->one->mode & 0777) == 0644 &&
(p->two->mode & 0777) == 0755)
return "mode +x";
else if ((p->one->mode & 0777) == 0755 &&
(p->two->mode & 0777) == 0644)
return "mode -x";
return NULL;
}
static void builtin_diffstat(const char *name_a, const char *name_b,
struct diff_filespec *one,
struct diff_filespec *two,
struct diffstat_t *diffstat,
struct diff_options *o,
struct diff_filepair *p)
{
mmfile_t mf1, mf2;
struct diffstat_file *data;
int same_contents;
int complete_rewrite = 0;
if (!DIFF_PAIR_UNMERGED(p)) {
if (p->status == DIFF_STATUS_MODIFIED && p->score)
complete_rewrite = 1;
}
data = diffstat_add(diffstat, name_a, name_b);
data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
if (o->flags.stat_with_summary)
data->comments = get_compact_summary(p, data->is_renamed);
if (!one || !two) {
data->is_unmerged = 1;
return;
}
same_contents = oideq(&one->oid, &two->oid);
if (diff_filespec_is_binary(o->repo, one) ||
diff_filespec_is_binary(o->repo, two)) {
data->is_binary = 1;
if (same_contents) {
data->added = 0;
data->deleted = 0;
} else {
data->added = diff_filespec_size(o->repo, two);
data->deleted = diff_filespec_size(o->repo, one);
}
}
else if (complete_rewrite) {
diff_populate_filespec(o->repo, one, 0);
diff_populate_filespec(o->repo, two, 0);
data->deleted = count_lines(one->data, one->size);
data->added = count_lines(two->data, two->size);
}
else if (!same_contents) {
/* Crazy xdl interfaces.. */
xpparam_t xpp;
xdemitconf_t xecfg;
if (fill_mmfile(o->repo, &mf1, one) < 0 ||
fill_mmfile(o->repo, &mf2, two) < 0)
die("unable to read files to diff");
memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
xpp.flags = o->xdl_opts;
xpp.anchors = o->anchors;
xpp.anchors_nr = o->anchors_nr;
xecfg.ctxlen = o->context;
xecfg.interhunkctxlen = o->interhunkcontext;
if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
diffstat_consume, diffstat, &xpp, &xecfg))
die("unable to generate diffstat for %s", one->path);
}
diff_free_filespec_data(one);
diff_free_filespec_data(two);
}
static void builtin_checkdiff(const char *name_a, const char *name_b,
const char *attr_path,
struct diff_filespec *one,
struct diff_filespec *two,
struct diff_options *o)
{
mmfile_t mf1, mf2;
struct checkdiff_t data;
if (!two)
return;
memset(&data, 0, sizeof(data));
data.filename = name_b ? name_b : name_a;
data.lineno = 0;
data.o = o;
data.ws_rule = whitespace_rule(o->repo->index, attr_path);
data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
if (fill_mmfile(o->repo, &mf1, one) < 0 ||
fill_mmfile(o->repo, &mf2, two) < 0)
die("unable to read files to diff");
/*
* All the other codepaths check both sides, but not checking
* the "old" side here is deliberate. We are checking the newly
* introduced changes, and as long as the "new" side is text, we
* can and should check what it introduces.
*/
if (diff_filespec_is_binary(o->repo, two))
goto free_and_return;
else {
/* Crazy xdl interfaces.. */
xpparam_t xpp;
xdemitconf_t xecfg;
memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 1; /* at least one context line */
xpp.flags = 0;
if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk,
checkdiff_consume, &data,
&xpp, &xecfg))
die("unable to generate checkdiff for %s", one->path);
if (data.ws_rule & WS_BLANK_AT_EOF) {
struct emit_callback ecbdata;
int blank_at_eof;
ecbdata.ws_rule = data.ws_rule;
check_blank_at_eof(&mf1, &mf2, &ecbdata);
blank_at_eof = ecbdata.blank_at_eof_in_postimage;
if (blank_at_eof) {
static char *err;
if (!err)
err = whitespace_error_string(WS_BLANK_AT_EOF);
fprintf(o->file, "%s:%d: %s.\n",
data.filename, blank_at_eof, err);
data.status = 1; /* report errors */
}
}
}
free_and_return:
diff_free_filespec_data(one);
diff_free_filespec_data(two);
if (data.status)
o->flags.check_failed = 1;
}
struct diff_filespec *alloc_filespec(const char *path)
{
struct diff_filespec *spec;
FLEXPTR_ALLOC_STR(spec, path, path);
spec->count = 1;
spec->is_binary = -1;
return spec;
}
void free_filespec(struct diff_filespec *spec)
{
if (!--spec->count) {
diff_free_filespec_data(spec);
free(spec);
}
}
void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
int oid_valid, unsigned short mode)
{
if (mode) {
spec->mode = canon_mode(mode);
oidcpy(&spec->oid, oid);
spec->oid_valid = oid_valid;
}
}
/*
* Given a name and sha1 pair, if the index tells us the file in
* the work tree has that object contents, return true, so that
* prepare_temp_file() does not have to inflate and extract.
*/
static int reuse_worktree_file(struct index_state *istate,
const char *name,
const struct object_id *oid,
int want_file)
{
const struct cache_entry *ce;
struct stat st;
int pos, len;
/*
* We do not read the cache ourselves here, because the
* benchmark with my previous version that always reads cache
* shows that it makes things worse for diff-tree comparing
* two linux-2.6 kernel trees in an already checked out work
* tree. This is because most diff-tree comparisons deal with
* only a small number of files, while reading the cache is
* expensive for a large project, and its cost outweighs the
* savings we get by not inflating the object to a temporary
* file. Practically, this code only helps when we are used
* by diff-cache --cached, which does read the cache before
* calling us.
*/
if (!istate->cache)
return 0;
/* We want to avoid the working directory if our caller
* doesn't need the data in a normal file, this system
* is rather slow with its stat/open/mmap/close syscalls,
* and the object is contained in a pack file. The pack
* is probably already open and will be faster to obtain
* the data through than the working directory. Loose
* objects however would tend to be slower as they need
* to be individually opened and inflated.
*/
if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
return 0;
/*
* Similarly, if we'd have to convert the file contents anyway, that
* makes the optimization not worthwhile.
*/
if (!want_file && would_convert_to_git(istate, name))
return 0;
len = strlen(name);
pos = index_name_pos(istate, name, len);
if (pos < 0)
return 0;
ce = istate->cache[pos];
/*
* This is not the sha1 we are looking for, or
* unreusable because it is not a regular file.
*/
if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
return 0;
/*
* If ce is marked as "assume unchanged", there is no
* guarantee that work tree matches what we are looking for.
*/
if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
return 0;
/*
* If ce matches the file in the work tree, we can reuse it.
*/
if (ce_uptodate(ce) ||
(!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
return 1;
return 0;
}
static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
{
struct strbuf buf = STRBUF_INIT;
char *dirty = "";
/* Are we looking at the work tree? */
if (s->dirty_submodule)
dirty = "-dirty";
strbuf_addf(&buf, "Subproject commit %s%s\n",
oid_to_hex(&s->oid), dirty);
s->size = buf.len;
if (size_only) {
s->data = NULL;
strbuf_release(&buf);
} else {
s->data = strbuf_detach(&buf, NULL);
s->should_free = 1;
}
return 0;
}
/*
* While doing rename detection and pickaxe operation, we may need to
* grab the data for the blob (or file) for our own in-core comparison.
* diff_filespec has data and size fields for this purpose.
*/
int diff_populate_filespec(struct repository *r,
struct diff_filespec *s,
unsigned int flags)
{
int size_only = flags & CHECK_SIZE_ONLY;
int err = 0;
int conv_flags = global_conv_flags_eol;
/*
* demote FAIL to WARN to allow inspecting the situation
* instead of refusing.
*/
if (conv_flags & CONV_EOL_RNDTRP_DIE)
conv_flags = CONV_EOL_RNDTRP_WARN;
if (!DIFF_FILE_VALID(s))
die("internal error: asking to populate invalid file.");
if (S_ISDIR(s->mode))
return -1;
if (s->data)
return 0;
if (size_only && 0 < s->size)
return 0;
if (S_ISGITLINK(s->mode))
return diff_populate_gitlink(s, size_only);
if (!s->oid_valid ||
reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
struct strbuf buf = STRBUF_INIT;
struct stat st;
int fd;
if (lstat(s->path, &st) < 0) {
err_empty:
err = -1;
empty:
s->data = (char *)"";
s->size = 0;
return err;
}
s->size = xsize_t(st.st_size);
if (!s->size)
goto empty;
if (S_ISLNK(st.st_mode)) {
struct strbuf sb = STRBUF_INIT;
if (strbuf_readlink(&sb, s->path, s->size))
goto err_empty;
s->size = sb.len;
s->data = strbuf_detach(&sb, NULL);
s->should_free = 1;
return 0;
}
/*
* Even if the caller would be happy with getting
* only the size, we cannot return early at this
* point if the path requires us to run the content
* conversion.
*/
if (size_only && !would_convert_to_git(r->index, s->path))
return 0;
/*
* Note: this check uses xsize_t(st.st_size) that may
* not be the true size of the blob after it goes
* through convert_to_git(). This may not strictly be
* correct, but the whole point of big_file_threshold
* and is_binary check being that we want to avoid
* opening the file and inspecting the contents, this
* is probably fine.
*/
if ((flags & CHECK_BINARY) &&
s->size > big_file_threshold && s->is_binary == -1) {
s->is_binary = 1;
return 0;
}
fd = open(s->path, O_RDONLY);
if (fd < 0)
goto err_empty;
s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
s->should_munmap = 1;
/*
* Convert from working tree format to canonical git format
*/
if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
size_t size = 0;
munmap(s->data, s->size);
s->should_munmap = 0;
s->data = strbuf_detach(&buf, &size);
s->size = size;
s->should_free = 1;
}
}
else {
enum object_type type;
if (size_only || (flags & CHECK_BINARY)) {
type = oid_object_info(r, &s->oid, &s->size);
if (type < 0)
die("unable to read %s",
oid_to_hex(&s->oid));
if (size_only)
return 0;
if (s->size > big_file_threshold && s->is_binary == -1) {
s->is_binary = 1;
return 0;
}
}
s->data = read_object_file(&s->oid, &type, &s->size);
if (!s->data)
die("unable to read %s", oid_to_hex(&s->oid));
s->should_free = 1;
}
return 0;
}
void diff_free_filespec_blob(struct diff_filespec *s)
{
if (s->should_free)
free(s->data);
else if (s->should_munmap)
munmap(s->data, s->size);
if (s->should_free || s->should_munmap) {
s->should_free = s->should_munmap = 0;
s->data = NULL;
}
}
void diff_free_filespec_data(struct diff_filespec *s)
{
diff_free_filespec_blob(s);
FREE_AND_NULL(s->cnt_data);
}
static void prep_temp_blob(struct index_state *istate,
const char *path, struct diff_tempfile *temp,
void *blob,
unsigned long size,
const struct object_id *oid,
int mode)
{
struct strbuf buf = STRBUF_INIT;
struct strbuf tempfile = STRBUF_INIT;
char *path_dup = xstrdup(path);
const char *base = basename(path_dup);
/* Generate "XXXXXX_basename.ext" */
strbuf_addstr(&tempfile, "XXXXXX_");
strbuf_addstr(&tempfile, base);
temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
if (!temp->tempfile)
die_errno("unable to create temp-file");
if (convert_to_working_tree(istate, path,
(const char *)blob, (size_t)size, &buf)) {
blob = buf.buf;
size = buf.len;
}
if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
close_tempfile_gently(temp->tempfile))
die_errno("unable to write temp-file");
temp->name = get_tempfile_path(temp->tempfile);
oid_to_hex_r(temp->hex, oid);
xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
strbuf_release(&buf);
strbuf_release(&tempfile);
free(path_dup);
}
static struct diff_tempfile *prepare_temp_file(struct repository *r,
const char *name,
struct diff_filespec *one)
{
struct diff_tempfile *temp = claim_diff_tempfile();
if (!DIFF_FILE_VALID(one)) {
not_a_valid_file:
/* A '-' entry produces this for file-2, and
* a '+' entry produces this for file-1.
*/
temp->name = "/dev/null";
xsnprintf(temp->hex, sizeof(temp->hex), ".");
xsnprintf(temp->mode, sizeof(temp->mode), ".");
return temp;
}
if (!S_ISGITLINK(one->mode) &&
(!one->oid_valid ||
reuse_worktree_file(r->index, name, &one->oid, 1))) {
struct stat st;
if (lstat(name, &st) < 0) {
if (errno == ENOENT)
goto not_a_valid_file;
die_errno("stat(%s)", name);
}
if (S_ISLNK(st.st_mode)) {
struct strbuf sb = STRBUF_INIT;
if (strbuf_readlink(&sb, name, st.st_size) < 0)
die_errno("readlink(%s)", name);
prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
(one->oid_valid ?
&one->oid : &null_oid),
(one->oid_valid ?
one->mode : S_IFLNK));
strbuf_release(&sb);
}
else {
/* we can borrow from the file in the work tree */
temp->name = name;
if (!one->oid_valid)
oid_to_hex_r(temp->hex, &null_oid);
else
oid_to_hex_r(temp->hex, &one->oid);
/* Even though we may sometimes borrow the
* contents from the work tree, we always want
* one->mode. mode is trustworthy even when
* !(one->oid_valid), as long as
* DIFF_FILE_VALID(one).
*/
xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
}
return temp;
}
else {
if (diff_populate_filespec(r, one, 0))
die("cannot read data blob for %s", one->path);
prep_temp_blob(r->index, name, temp,
one->data, one->size,
&one->oid, one->mode);
}
return temp;
}
static void add_external_diff_name(struct repository *r,
struct argv_array *argv,
const char *name,
struct diff_filespec *df)
{
struct diff_tempfile *temp = prepare_temp_file(r, name, df);
argv_array_push(argv, temp->name);
argv_array_push(argv, temp->hex);
argv_array_push(argv, temp->mode);
}
/* An external diff command takes:
*
* diff-cmd name infile1 infile1-sha1 infile1-mode \
* infile2 infile2-sha1 infile2-mode [ rename-to ]
*
*/
static void run_external_diff(const char *pgm,
const char *name,
const char *other,
struct diff_filespec *one,
struct diff_filespec *two,
const char *xfrm_msg,
struct diff_options *o)
{
struct argv_array argv = ARGV_ARRAY_INIT;
struct argv_array env = ARGV_ARRAY_INIT;
struct diff_queue_struct *q = &diff_queued_diff;
argv_array_push(&argv, pgm);
argv_array_push(&argv, name);
if (one && two) {
add_external_diff_name(o->repo, &argv, name, one);
if (!other)
add_external_diff_name(o->repo, &argv, name, two);
else {
add_external_diff_name(o->repo, &argv, other, two);
argv_array_push(&argv, other);
argv_array_push(&argv, xfrm_msg);
}
}
argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
diff_free_filespec_data(one);
diff_free_filespec_data(two);
if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
die(_("external diff died, stopping at %s"), name);
remove_tempfile();
argv_array_clear(&argv);
argv_array_clear(&env);
}
static int similarity_index(struct diff_filepair *p)
{
return p->score * 100 / MAX_SCORE;
}
static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
{
if (startup_info->have_repository)
return find_unique_abbrev(oid, abbrev);
else {
char *hex = oid_to_hex(oid);
if (abbrev < 0)
abbrev = FALLBACK_DEFAULT_ABBREV;
if (abbrev > the_hash_algo->hexsz)
BUG("oid abbreviation out of range: %d", abbrev);
if (abbrev)
hex[abbrev] = '\0';
return hex;
}
}
static void fill_metainfo(struct strbuf *msg,
const char *name,
const char *other,
struct diff_filespec *one,
struct diff_filespec *two,
struct diff_options *o,
struct diff_filepair *p,
int *must_show_header,
int use_color)
{
const char *set = diff_get_color(use_color, DIFF_METAINFO);
const char *reset = diff_get_color(use_color, DIFF_RESET);
const char *line_prefix = diff_line_prefix(o);
*must_show_header = 1;
strbuf_init(msg, PATH_MAX * 2 + 300);
switch (p->status) {
case DIFF_STATUS_COPIED:
strbuf_addf(msg, "%s%ssimilarity index %d%%",
line_prefix, set, similarity_index(p));
strbuf_addf(msg, "%s\n%s%scopy from ",
reset, line_prefix, set);
quote_c_style(name, msg, NULL, 0);
strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
quote_c_style(other, msg, NULL, 0);
strbuf_addf(msg, "%s\n", reset);
break;
case DIFF_STATUS_RENAMED:
strbuf_addf(msg, "%s%ssimilarity index %d%%",
line_prefix, set, similarity_index(p));
strbuf_addf(msg, "%s\n%s%srename from ",
reset, line_prefix, set);
quote_c_style(name, msg, NULL, 0);
strbuf_addf(msg, "%s\n%s%srename to ",
reset, line_prefix, set);
quote_c_style(other, msg, NULL, 0);
strbuf_addf(msg, "%s\n", reset);
break;
case DIFF_STATUS_MODIFIED:
if (p->score) {
strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
line_prefix,
set, similarity_index(p), reset);
break;
}
/* fallthru */
default:
*must_show_header = 0;
}
if (one && two && !oideq(&one->oid, &two->oid)) {
const unsigned hexsz = the_hash_algo->hexsz;
int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
if (o->flags.binary) {
mmfile_t mf;
if ((!fill_mmfile(o->repo, &mf, one) &&
diff_filespec_is_binary(o->repo, one)) ||
(!fill_mmfile(o->repo, &mf, two) &&
diff_filespec_is_binary(o->repo, two)))
abbrev = hexsz;
}
strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
diff_abbrev_oid(&one->oid, abbrev),
diff_abbrev_oid(&two->oid, abbrev));
if (one->mode == two->mode)
strbuf_addf(msg, " %06o", one->mode);
strbuf_addf(msg, "%s\n", reset);
}
}
static void run_diff_cmd(const char *pgm,
const char *name,
const char *other,
const char *attr_path,
struct diff_filespec *one,
struct diff_filespec *two,
struct strbuf *msg,
struct diff_options *o,
struct diff_filepair *p)
{
const char *xfrm_msg = NULL;
int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
int must_show_header = 0;
if (o->flags.allow_external) {
struct userdiff_driver *drv;
drv = userdiff_find_by_path(o->repo->index, attr_path);
if (drv && drv->external)
pgm = drv->external;
}
if (msg) {
/*
* don't use colors when the header is intended for an
* external diff driver
*/
fill_metainfo(msg, name, other, one, two, o, p,
&must_show_header,
want_color(o->use_color) && !pgm);
xfrm_msg = msg->len ? msg->buf : NULL;
}
if (pgm) {
run_external_diff(pgm, name, other, one, two, xfrm_msg, o);
return;
}
if (one && two)
builtin_diff(name, other ? other : name,
one, two, xfrm_msg, must_show_header,
o, complete_rewrite);
else
fprintf(o->file, "* Unmerged path %s\n", name);
}
static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
{
if (DIFF_FILE_VALID(one)) {
if (!one->oid_valid) {
struct stat st;
if (one->is_stdin) {
oidclr(&one->oid);
return;
}
if (lstat(one->path, &st) < 0)
die_errno("stat '%s'", one->path);
if (index_path(istate, &one->oid, one->path, &st, 0))
die("cannot hash %s", one->path);
}
}
else
oidclr(&one->oid);
}
static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
{
/* Strip the prefix but do not molest /dev/null and absolute paths */
if (*namep && !is_absolute_path(*namep)) {
*namep += prefix_length;
if (**namep == '/')
++*namep;
}
if (*otherp && !is_absolute_path(*otherp)) {
*otherp += prefix_length;
if (**otherp == '/')
++*otherp;
}
}
static void run_diff(struct diff_filepair *p, struct diff_options *o)
{
const char *pgm = external_diff();
struct strbuf msg;
struct diff_filespec *one = p->one;
struct diff_filespec *two = p->two;
const char *name;
const char *other;
const char *attr_path;
name = one->path;
other = (strcmp(name, two->path) ? two->path : NULL);
attr_path = name;
if (o->prefix_length)
strip_prefix(o->prefix_length, &name, &other);
if (!o->flags.allow_external)
pgm = NULL;
if (DIFF_PAIR_UNMERGED(p)) {
run_diff_cmd(pgm, name, NULL, attr_path,
NULL, NULL, NULL, o, p);
return;
}
diff_fill_oid_info(one, o->repo->index);
diff_fill_oid_info(two, o->repo->index);
if (!pgm &&
DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
(S_IFMT & one->mode) != (S_IFMT & two->mode)) {
/*
* a filepair that changes between file and symlink
* needs to be split into deletion and creation.
*/
struct diff_filespec *null = alloc_filespec(two->path);
run_diff_cmd(NULL, name, other, attr_path,
one, null, &msg,
o, p);
free(null);
strbuf_release(&msg);
null = alloc_filespec(one->path);
run_diff_cmd(NULL, name, other, attr_path,
null, two, &msg, o, p);
free(null);
}
else
run_diff_cmd(pgm, name, other, attr_path,
one, two, &msg, o, p);
strbuf_release(&msg);
}
static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
struct diffstat_t *diffstat)
{
const char *name;
const char *other;
if (DIFF_PAIR_UNMERGED(p)) {
/* unmerged */
builtin_diffstat(p->one->path, NULL, NULL, NULL,
diffstat, o, p);
return;
}
name = p->one->path;
other = (strcmp(name, p->two->path) ? p->two->path : NULL);
if (o->prefix_length)
strip_prefix(o->prefix_length, &name, &other);
diff_fill_oid_info(p->one, o->repo->index);
diff_fill_oid_info(p->two, o->repo->index);
builtin_diffstat(name, other, p->one, p->two,
diffstat, o, p);
}
static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
{
const char *name;
const char *other;
const char *attr_path;
if (DIFF_PAIR_UNMERGED(p)) {
/* unmerged */
return;
}
name = p->one->path;
other = (strcmp(name, p->two->path) ? p->two->path : NULL);
attr_path = other ? other : name;
if (o->prefix_length)
strip_prefix(o->prefix_length, &name, &other);
diff_fill_oid_info(p->one, o->repo->index);
diff_fill_oid_info(p->two, o->repo->index);
builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
}
static void prep_parse_options(struct diff_options *options);
void repo_diff_setup(struct repository *r, struct diff_options *options)
{
memcpy(options, &default_diff_options, sizeof(*options));
options->file = stdout;
options->repo = r;
options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
options->abbrev = DEFAULT_ABBREV;
options->line_termination = '\n';
options->break_opt = -1;
options->rename_limit = -1;
options->dirstat_permille = diff_dirstat_permille_default;
options->context = diff_context_default;
options->interhunkcontext = diff_interhunk_context_default;
options->ws_error_highlight = ws_error_highlight_default;
options->flags.rename_empty = 1;
options->objfind = NULL;
/* pathchange left =NULL by default */
options->change = diff_change;
options->add_remove = diff_addremove;
options->use_color = diff_use_color_default;
options->detect_rename = diff_detect_rename_default;
options->xdl_opts |= diff_algorithm;
if (diff_indent_heuristic)
DIFF_XDL_SET(options, INDENT_HEURISTIC);
options->orderfile = diff_order_file_cfg;
if (diff_no_prefix) {
options->a_prefix = options->b_prefix = "";
} else if (!diff_mnemonic_prefix) {
options->a_prefix = "a/";
options->b_prefix = "b/";
}
options->color_moved = diff_color_moved_default;
options->color_moved_ws_handling = diff_color_moved_ws_default;
prep_parse_options(options);
}
void diff_setup_done(struct diff_options *options)
{
unsigned check_mask = DIFF_FORMAT_NAME |
DIFF_FORMAT_NAME_STATUS |
DIFF_FORMAT_CHECKDIFF |
DIFF_FORMAT_NO_OUTPUT;
/*
* This must be signed because we're comparing against a potentially
* negative value.
*/
const int hexsz = the_hash_algo->hexsz;
if (options->set_default)
options->set_default(options);
if (HAS_MULTI_BITS(options->output_format & check_mask))
die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
die(_("-G, -S and --find-object are mutually exclusive"));
/*
* Most of the time we can say "there are changes"
* only by checking if there are changed paths, but
* --ignore-whitespace* options force us to look
* inside contents.
*/
if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
options->flags.diff_from_contents = 1;
else
options->flags.diff_from_contents = 0;
if (options->flags.find_copies_harder)
options->detect_rename = DIFF_DETECT_COPY;
if (!options->flags.relative_name)
options->prefix = NULL;
if (options->prefix)
options->prefix_length = strlen(options->prefix);
else
options->prefix_length = 0;
if (options->output_format & (DIFF_FORMAT_NAME |
DIFF_FORMAT_NAME_STATUS |
DIFF_FORMAT_CHECKDIFF |
DIFF_FORMAT_NO_OUTPUT))
options->output_format &= ~(DIFF_FORMAT_RAW |
DIFF_FORMAT_NUMSTAT |
DIFF_FORMAT_DIFFSTAT |
DIFF_FORMAT_SHORTSTAT |
DIFF_FORMAT_DIRSTAT |
DIFF_FORMAT_SUMMARY |
DIFF_FORMAT_PATCH);
/*
* These cases always need recursive; we do not drop caller-supplied
* recursive bits for other formats here.
*/
if (options->output_format & (DIFF_FORMAT_PATCH |
DIFF_FORMAT_NUMSTAT |
DIFF_FORMAT_DIFFSTAT |
DIFF_FORMAT_SHORTSTAT |
DIFF_FORMAT_DIRSTAT |
DIFF_FORMAT_SUMMARY |
DIFF_FORMAT_CHECKDIFF))
options->flags.recursive = 1;
/*
* Also pickaxe would not work very well if you do not say recursive
*/
if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
options->flags.recursive = 1;
/*
* When patches are generated, submodules diffed against the work tree
* must be checked for dirtiness too so it can be shown in the output
*/
if (options->output_format & DIFF_FORMAT_PATCH)
options->flags.dirty_submodules = 1;
if (options->detect_rename && options->rename_limit < 0)
options->rename_limit = diff_rename_limit_default;
if (hexsz < options->abbrev)
options->abbrev = hexsz; /* full */
/*
* It does not make sense to show the first hit we happened
* to have found. It does not make sense not to return with
* exit code in such a case either.
*/
if (options->flags.quick) {
options->output_format = DIFF_FORMAT_NO_OUTPUT;
options->flags.exit_with_status = 1;
}
options->diff_path_counter = 0;
if (options->flags.follow_renames && options->pathspec.nr != 1)
die(_("--follow requires exactly one pathspec"));
if (!options->use_color || external_diff())
options->color_moved = 0;
FREE_AND_NULL(options->parseopts);
}
int parse_long_opt(const char *opt, const char **argv,
const char **optarg)
{
const char *arg = argv[0];
if (!skip_prefix(arg, "--", &arg))
return 0;
if (!skip_prefix(arg, opt, &arg))
return 0;
if (*arg == '=') { /* stuck form: --option=value */
*optarg = arg + 1;
return 1;
}
if (*arg != '\0')
return 0;
/* separate form: --option value */
if (!argv[1])
die("Option '--%s' requires a value", opt);
*optarg = argv[1];
return 2;
}
static int diff_opt_stat(const struct option *opt, const char *value, int unset)
{
struct diff_options *options = opt->value;
int width = options->stat_width;
int name_width = options->stat_name_width;
int graph_width = options->stat_graph_width;
int count = options->stat_count;
char *end;
BUG_ON_OPT_NEG(unset);
if (!strcmp(opt->long_name, "stat")) {
if (value) {
width = strtoul(value, &end, 10);
if (*end == ',')
name_width = strtoul(end+1, &end, 10);
if (*end == ',')
count = strtoul(end+1, &end, 10);
if (*end)
return error(_("invalid --stat value: %s"), value);
}
} else if (!strcmp(opt->long_name, "stat-width")) {
width = strtoul(value, &end, 10);
if (*end)
return error(_("%s expects a numerical value"),
opt->long_name);
} else if (!strcmp(opt->long_name, "stat-name-width")) {
name_width = strtoul(value, &end, 10);
if (*end)
return error(_("%s expects a numerical value"),
opt->long_name);
} else if (!strcmp(opt->long_name, "stat-graph-width")) {
graph_width = strtoul(value, &end, 10);
if (*end)
return error(_("%s expects a numerical value"),
opt->long_name);
} else if (!strcmp(opt->long_name, "stat-count")) {
count = strtoul(value, &end, 10);
if (*end)
return error(_("%s expects a numerical value"),
opt->long_name);
} else
BUG("%s should not get here", opt->long_name);
options->output_format |= DIFF_FORMAT_DIFFSTAT;
options->stat_name_width = name_width;
options->stat_graph_width = graph_width;
options->stat_width = width;
options->stat_count = count;
return 0;
}
static int parse_dirstat_opt(struct diff_options *options, const char *params)
{
struct strbuf errmsg = STRBUF_INIT;
if (parse_dirstat_params(options, params, &errmsg))
die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
errmsg.buf);
strbuf_release(&errmsg);
/*
* The caller knows a dirstat-related option is given from the command
* line; allow it to say "return this_function();"
*/
options->output_format |= DIFF_FORMAT_DIRSTAT;
return 1;
}
static const char diff_status_letters[] = {
DIFF_STATUS_ADDED,
DIFF_STATUS_COPIED,
DIFF_STATUS_DELETED,
DIFF_STATUS_MODIFIED,
DIFF_STATUS_RENAMED,
DIFF_STATUS_TYPE_CHANGED,
DIFF_STATUS_UNKNOWN,
DIFF_STATUS_UNMERGED,
DIFF_STATUS_FILTER_AON,
DIFF_STATUS_FILTER_BROKEN,
'\0',
};
static unsigned int filter_bit['Z' + 1];
static void prepare_filter_bits(void)
{
int i;
if (!filter_bit[DIFF_STATUS_ADDED]) {
for (i = 0; diff_status_letters[i]; i++)
filter_bit[(int) diff_status_letters[i]] = (1 << i);
}
}
static unsigned filter_bit_tst(char status, const struct diff_options *opt)
{
return opt->filter & filter_bit[(int) status];
}
unsigned diff_filter_bit(char status)
{
prepare_filter_bits();
return filter_bit[(int) status];
}
static int diff_opt_diff_filter(const struct option *option,
const char *optarg, int unset)
{
struct diff_options *opt = option->value;
int i, optch;
BUG_ON_OPT_NEG(unset);
prepare_filter_bits();
/*
* If there is a negation e.g. 'd' in the input, and we haven't
* initialized the filter field with another --diff-filter, start
* from full set of bits, except for AON.
*/
if (!opt->filter) {
for (i = 0; (optch = optarg[i]) != '\0'; i++) {
if (optch < 'a' || 'z' < optch)
continue;
opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
break;
}
}
for (i = 0; (optch = optarg[i]) != '\0'; i++) {
unsigned int bit;
int negate;
if ('a' <= optch && optch <= 'z') {
negate = 1;
optch = toupper(optch);
} else {
negate = 0;
}
bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
if (!bit)
return error(_("unknown change class '%c' in --diff-filter=%s"),
optarg[i], optarg);
if (negate)
opt->filter &= ~bit;
else
opt->filter |= bit;
}
return 0;
}
static void enable_patch_output(int *fmt)
{
*fmt &= ~DIFF_FORMAT_NO_OUTPUT;
*fmt |= DIFF_FORMAT_PATCH;
}
static int diff_opt_ws_error_highlight(const struct option *option,
const char *arg, int unset)
{
struct diff_options *opt = option->value;
int val = parse_ws_error_highlight(arg);
BUG_ON_OPT_NEG(unset);
if (val < 0)
return error(_("unknown value after ws-error-highlight=%.*s"),
-1 - val, arg);
opt->ws_error_highlight = val;
return 0;
}
static int diff_opt_find_object(const struct option *option,
const char *arg, int unset)
{
struct diff_options *opt = option->value;
struct object_id oid;
BUG_ON_OPT_NEG(unset);
if (get_oid(arg, &oid))
return error(_("unable to resolve '%s'"), arg);
if (!opt->objfind)
opt->objfind = xcalloc(1, sizeof(*opt->objfind));
opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
opt->flags.recursive = 1;
opt->flags.tree_in_recursive = 1;
oidset_insert(opt->objfind, &oid);
return 0;
}
static int diff_opt_anchored(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
ALLOC_GROW(options->anchors, options->anchors_nr + 1,
options->anchors_alloc);
options->anchors[options->anchors_nr++] = xstrdup(arg);
return 0;
}
static int diff_opt_binary(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
BUG_ON_OPT_ARG(arg);
enable_patch_output(&options->output_format);
options->flags.binary = 1;
return 0;
}
static int diff_opt_break_rewrites(const struct option *opt,
const char *arg, int unset)
{
int *break_opt = opt->value;
int opt1, opt2;
BUG_ON_OPT_NEG(unset);
if (!arg)
arg = "";
opt1 = parse_rename_score(&arg);
if (*arg == 0)
opt2 = 0;
else if (*arg != '/')
return error(_("%s expects <n>/<m> form"), opt->long_name);
else {
arg++;
opt2 = parse_rename_score(&arg);
}
if (*arg != 0)
return error(_("%s expects <n>/<m> form"), opt->long_name);
*break_opt = opt1 | (opt2 << 16);
return 0;
}
static int diff_opt_char(const struct option *opt,
const char *arg, int unset)
{
char *value = opt->value;
BUG_ON_OPT_NEG(unset);
if (arg[1])
return error(_("%s expects a character, got '%s'"),
opt->long_name, arg);
*value = arg[0];
return 0;
}
static int diff_opt_color_moved(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
if (unset) {
options->color_moved = COLOR_MOVED_NO;
} else if (!arg) {
if (diff_color_moved_default)
options->color_moved = diff_color_moved_default;
if (options->color_moved == COLOR_MOVED_NO)
options->color_moved = COLOR_MOVED_DEFAULT;
} else {
int cm = parse_color_moved(arg);
if (cm < 0)
return error(_("bad --color-moved argument: %s"), arg);
options->color_moved = cm;
}
return 0;
}
static int diff_opt_color_moved_ws(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
unsigned cm;
if (unset) {
options->color_moved_ws_handling = 0;
return 0;
}
cm = parse_color_moved_ws(arg);
if (cm & COLOR_MOVED_WS_ERROR)
return error(_("invalid mode '%s' in --color-moved-ws"), arg);
options->color_moved_ws_handling = cm;
return 0;
}
static int diff_opt_color_words(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
options->use_color = 1;
options->word_diff = DIFF_WORDS_COLOR;
options->word_regex = arg;
return 0;
}
static int diff_opt_compact_summary(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_ARG(arg);
if (unset) {
options->flags.stat_with_summary = 0;
} else {
options->flags.stat_with_summary = 1;
options->output_format |= DIFF_FORMAT_DIFFSTAT;
}
return 0;
}
static int diff_opt_diff_algorithm(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
long value = parse_algorithm_value(arg);
BUG_ON_OPT_NEG(unset);
if (value < 0)
return error(_("option diff-algorithm accepts \"myers\", "
"\"minimal\", \"patience\" and \"histogram\""));
/* clear out previous settings */
DIFF_XDL_CLR(options, NEED_MINIMAL);
options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
options->xdl_opts |= value;
return 0;
}
static int diff_opt_dirstat(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
if (!strcmp(opt->long_name, "cumulative")) {
if (arg)
BUG("how come --cumulative take a value?");
arg = "cumulative";
} else if (!strcmp(opt->long_name, "dirstat-by-file"))
parse_dirstat_opt(options, "files");
parse_dirstat_opt(options, arg ? arg : "");
return 0;
}
static int diff_opt_find_copies(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
if (!arg)
arg = "";
options->rename_score = parse_rename_score(&arg);
if (*arg != 0)
return error(_("invalid argument to %s"), opt->long_name);
if (options->detect_rename == DIFF_DETECT_COPY)
options->flags.find_copies_harder = 1;
else
options->detect_rename = DIFF_DETECT_COPY;
return 0;
}
static int diff_opt_find_renames(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
if (!arg)
arg = "";
options->rename_score = parse_rename_score(&arg);
if (*arg != 0)
return error(_("invalid argument to %s"), opt->long_name);
options->detect_rename = DIFF_DETECT_RENAME;
return 0;
}
static int diff_opt_follow(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_ARG(arg);
if (unset) {
options->flags.follow_renames = 0;
options->flags.default_follow_renames = 0;
} else {
options->flags.follow_renames = 1;
}
return 0;
}
static int diff_opt_ignore_submodules(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
if (!arg)
arg = "all";
options->flags.override_submodule_config = 1;
handle_ignore_submodules_arg(options, arg);
return 0;
}
static int diff_opt_line_prefix(const struct option *opt,
const char *optarg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
options->line_prefix = optarg;
options->line_prefix_length = strlen(options->line_prefix);
graph_setup_line_prefix(options);
return 0;
}
static int diff_opt_no_prefix(const struct option *opt,
const char *optarg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
BUG_ON_OPT_ARG(optarg);
options->a_prefix = "";
options->b_prefix = "";
return 0;
}
static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx,
const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
char *path;
BUG_ON_OPT_NEG(unset);
path = prefix_filename(ctx->prefix, arg);
options->file = xfopen(path, "w");
options->close_file = 1;
if (options->use_color != GIT_COLOR_ALWAYS)
options->use_color = GIT_COLOR_NEVER;
free(path);
return 0;
}
static int diff_opt_patience(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
int i;
BUG_ON_OPT_NEG(unset);
BUG_ON_OPT_ARG(arg);
options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
/*
* Both --patience and --anchored use PATIENCE_DIFF
* internally, so remove any anchors previously
* specified.
*/
for (i = 0; i < options->anchors_nr; i++)
free(options->anchors[i]);
options->anchors_nr = 0;
return 0;
}
static int diff_opt_pickaxe_regex(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
options->pickaxe = arg;
options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
return 0;
}
static int diff_opt_pickaxe_string(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
options->pickaxe = arg;
options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
return 0;
}
static int diff_opt_relative(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
options->flags.relative_name = 1;
if (arg)
options->prefix = arg;
return 0;
}
static int diff_opt_submodule(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
if (!arg)
arg = "log";
if (parse_submodule_params(options, arg))
return error(_("failed to parse --submodule option parameter: '%s'"),
arg);
return 0;
}
static int diff_opt_textconv(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_ARG(arg);
if (unset) {
options->flags.allow_textconv = 0;
} else {
options->flags.allow_textconv = 1;
options->flags.textconv_set_via_cmdline = 1;
}
return 0;
}
static int diff_opt_unified(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
char *s;
BUG_ON_OPT_NEG(unset);
if (arg) {
options->context = strtol(arg, &s, 10);
if (*s)
return error(_("%s expects a numerical value"), "--unified");
}
enable_patch_output(&options->output_format);
return 0;
}
static int diff_opt_word_diff(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
if (arg) {
if (!strcmp(arg, "plain"))
options->word_diff = DIFF_WORDS_PLAIN;
else if (!strcmp(arg, "color")) {
options->use_color = 1;
options->word_diff = DIFF_WORDS_COLOR;
}
else if (!strcmp(arg, "porcelain"))
options->word_diff = DIFF_WORDS_PORCELAIN;
else if (!strcmp(arg, "none"))
options->word_diff = DIFF_WORDS_NONE;
else
return error(_("bad --word-diff argument: %s"), arg);
} else {
if (options->word_diff == DIFF_WORDS_NONE)
options->word_diff = DIFF_WORDS_PLAIN;
}
return 0;
}
static int diff_opt_word_diff_regex(const struct option *opt,
const char *arg, int unset)
{
struct diff_options *options = opt->value;
BUG_ON_OPT_NEG(unset);
if (options->word_diff == DIFF_WORDS_NONE)
options->word_diff = DIFF_WORDS_PLAIN;
options->word_regex = arg;
return 0;
}
static void prep_parse_options(struct diff_options *options)
{
struct option parseopts[] = {
OPT_GROUP(N_("Diff output format options")),
OPT_BITOP('p', "patch", &options->output_format,
N_("generate patch"),
DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
OPT_BIT_F('s', "no-patch", &options->output_format,
N_("suppress diff output"),
DIFF_FORMAT_NO_OUTPUT, PARSE_OPT_NONEG),
OPT_BITOP('u', NULL, &options->output_format,
N_("generate patch"),
DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
OPT_CALLBACK_F('U', "unified", options, N_("<n>"),
N_("generate diffs with <n> lines context"),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_unified),
OPT_BOOL('W', "function-context", &options->flags.funccontext,
N_("generate diffs with <n> lines context")),
OPT_BIT_F(0, "raw", &options->output_format,
N_("generate the diff in raw format"),
DIFF_FORMAT_RAW, PARSE_OPT_NONEG),
OPT_BITOP(0, "patch-with-raw", &options->output_format,
N_("synonym for '-p --raw'"),
DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW,
DIFF_FORMAT_NO_OUTPUT),
OPT_BITOP(0, "patch-with-stat", &options->output_format,
N_("synonym for '-p --stat'"),
DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT,
DIFF_FORMAT_NO_OUTPUT),
OPT_BIT_F(0, "numstat", &options->output_format,
N_("machine friendly --stat"),
DIFF_FORMAT_NUMSTAT, PARSE_OPT_NONEG),
OPT_BIT_F(0, "shortstat", &options->output_format,
N_("output only the last line of --stat"),
DIFF_FORMAT_SHORTSTAT, PARSE_OPT_NONEG),
OPT_CALLBACK_F('X', "dirstat", options, N_("<param1,param2>..."),
N_("output the distribution of relative amount of changes for each sub-directory"),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
diff_opt_dirstat),
OPT_CALLBACK_F(0, "cumulative", options, NULL,
N_("synonym for --dirstat=cumulative"),
PARSE_OPT_NONEG | PARSE_OPT_NOARG,
diff_opt_dirstat),
OPT_CALLBACK_F(0, "dirstat-by-file", options, N_("<param1,param2>..."),
N_("synonym for --dirstat=files,param1,param2..."),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
diff_opt_dirstat),
OPT_BIT_F(0, "check", &options->output_format,
N_("warn if changes introduce conflict markers or whitespace errors"),
DIFF_FORMAT_CHECKDIFF, PARSE_OPT_NONEG),
OPT_BIT_F(0, "summary", &options->output_format,
N_("condensed summary such as creations, renames and mode changes"),
DIFF_FORMAT_SUMMARY, PARSE_OPT_NONEG),
OPT_BIT_F(0, "name-only", &options->output_format,
N_("show only names of changed files"),
DIFF_FORMAT_NAME, PARSE_OPT_NONEG),
OPT_BIT_F(0, "name-status", &options->output_format,
N_("show only names and status of changed files"),
DIFF_FORMAT_NAME_STATUS, PARSE_OPT_NONEG),
OPT_CALLBACK_F(0, "stat", options, N_("<width>[,<name-width>[,<count>]]"),
N_("generate diffstat"),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_stat),
OPT_CALLBACK_F(0, "stat-width", options, N_("<width>"),
N_("generate diffstat with a given width"),
PARSE_OPT_NONEG, diff_opt_stat),
OPT_CALLBACK_F(0, "stat-name-width", options, N_("<width>"),
N_("generate diffstat with a given name width"),
PARSE_OPT_NONEG, diff_opt_stat),
OPT_CALLBACK_F(0, "stat-graph-width", options, N_("<width>"),
N_("generate diffstat with a given graph width"),
PARSE_OPT_NONEG, diff_opt_stat),
OPT_CALLBACK_F(0, "stat-count", options, N_("<count>"),
N_("generate diffstat with limited lines"),
PARSE_OPT_NONEG, diff_opt_stat),
OPT_CALLBACK_F(0, "compact-summary", options, NULL,
N_("generate compact summary in diffstat"),
PARSE_OPT_NOARG, diff_opt_compact_summary),
OPT_CALLBACK_F(0, "binary", options, NULL,
N_("output a binary diff that can be applied"),
PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_binary),
OPT_BOOL(0, "full-index", &options->flags.full_index,
N_("show full pre- and post-image object names on the \"index\" lines")),
OPT_COLOR_FLAG(0, "color", &options->use_color,
N_("show colored diff")),
OPT_CALLBACK_F(0, "ws-error-highlight", options, N_("<kind>"),
N_("highlight whitespace errors in the 'context', 'old' or 'new' lines in the diff"),
PARSE_OPT_NONEG, diff_opt_ws_error_highlight),
OPT_SET_INT('z', NULL, &options->line_termination,
N_("do not munge pathnames and use NULs as output field terminators in --raw or --numstat"),
0),
OPT__ABBREV(&options->abbrev),
OPT_STRING_F(0, "src-prefix", &options->a_prefix, N_("<prefix>"),
N_("show the given source prefix instead of \"a/\""),
PARSE_OPT_NONEG),
OPT_STRING_F(0, "dst-prefix", &options->b_prefix, N_("<prefix>"),
N_("show the given destination prefix instead of \"b/\""),
PARSE_OPT_NONEG),
OPT_CALLBACK_F(0, "line-prefix", options, N_("<prefix>"),
N_("prepend an additional prefix to every line of output"),
PARSE_OPT_NONEG, diff_opt_line_prefix),
OPT_CALLBACK_F(0, "no-prefix", options, NULL,
N_("do not show any source or destination prefix"),
PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_no_prefix),
OPT_INTEGER_F(0, "inter-hunk-context", &options->interhunkcontext,
N_("show context between diff hunks up to the specified number of lines"),
PARSE_OPT_NONEG),
OPT_CALLBACK_F(0, "output-indicator-new",
&options->output_indicators[OUTPUT_INDICATOR_NEW],
N_("<char>"),
N_("specify the character to indicate a new line instead of '+'"),
PARSE_OPT_NONEG, diff_opt_char),
OPT_CALLBACK_F(0, "output-indicator-old",
&options->output_indicators[OUTPUT_INDICATOR_OLD],
N_("<char>"),
N_("specify the character to indicate an old line instead of '-'"),
PARSE_OPT_NONEG, diff_opt_char),
OPT_CALLBACK_F(0, "output-indicator-context",
&options->output_indicators[OUTPUT_INDICATOR_CONTEXT],
N_("<char>"),
N_("specify the character to indicate a context instead of ' '"),
PARSE_OPT_NONEG, diff_opt_char),
OPT_GROUP(N_("Diff rename options")),
OPT_CALLBACK_F('B', "break-rewrites", &options->break_opt, N_("<n>[/<m>]"),
N_("break complete rewrite changes into pairs of delete and create"),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
diff_opt_break_rewrites),
OPT_CALLBACK_F('M', "find-renames", options, N_("<n>"),
N_("detect renames"),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
diff_opt_find_renames),
OPT_SET_INT_F('D', "irreversible-delete", &options->irreversible_delete,
N_("omit the preimage for deletes"),
1, PARSE_OPT_NONEG),
OPT_CALLBACK_F('C', "find-copies", options, N_("<n>"),
N_("detect copies"),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
diff_opt_find_copies),
OPT_BOOL(0, "find-copies-harder", &options->flags.find_copies_harder,
N_("use unmodified files as source to find copies")),
OPT_SET_INT_F(0, "no-renames", &options->detect_rename,
N_("disable rename detection"),
0, PARSE_OPT_NONEG),
OPT_BOOL(0, "rename-empty", &options->flags.rename_empty,
N_("use empty blobs as rename source")),
OPT_CALLBACK_F(0, "follow", options, NULL,
N_("continue listing the history of a file beyond renames"),
PARSE_OPT_NOARG, diff_opt_follow),
OPT_INTEGER('l', NULL, &options->rename_limit,
N_("prevent rename/copy detection if the number of rename/copy targets exceeds given limit")),
OPT_GROUP(N_("Diff algorithm options")),
OPT_BIT(0, "minimal", &options->xdl_opts,
N_("produce the smallest possible diff"),
XDF_NEED_MINIMAL),
OPT_BIT_F('w', "ignore-all-space", &options->xdl_opts,
N_("ignore whitespace when comparing lines"),
XDF_IGNORE_WHITESPACE, PARSE_OPT_NONEG),
OPT_BIT_F('b', "ignore-space-change", &options->xdl_opts,
N_("ignore changes in amount of whitespace"),
XDF_IGNORE_WHITESPACE_CHANGE, PARSE_OPT_NONEG),
OPT_BIT_F(0, "ignore-space-at-eol", &options->xdl_opts,
N_("ignore changes in whitespace at EOL"),
XDF_IGNORE_WHITESPACE_AT_EOL, PARSE_OPT_NONEG),
OPT_BIT_F(0, "ignore-cr-at-eol", &options->xdl_opts,
N_("ignore carrier-return at the end of line"),
XDF_IGNORE_CR_AT_EOL, PARSE_OPT_NONEG),
OPT_BIT_F(0, "ignore-blank-lines", &options->xdl_opts,
N_("ignore changes whose lines are all blank"),
XDF_IGNORE_BLANK_LINES, PARSE_OPT_NONEG),
OPT_BIT(0, "indent-heuristic", &options->xdl_opts,
N_("heuristic to shift diff hunk boundaries for easy reading"),
XDF_INDENT_HEURISTIC),
OPT_CALLBACK_F(0, "patience", options, NULL,
N_("generate diff using the \"patience diff\" algorithm"),
PARSE_OPT_NONEG | PARSE_OPT_NOARG,
diff_opt_patience),
OPT_BITOP(0, "histogram", &options->xdl_opts,
N_("generate diff using the \"histogram diff\" algorithm"),
XDF_HISTOGRAM_DIFF, XDF_DIFF_ALGORITHM_MASK),
OPT_CALLBACK_F(0, "diff-algorithm", options, N_("<algorithm>"),
N_("choose a diff algorithm"),
PARSE_OPT_NONEG, diff_opt_diff_algorithm),
OPT_CALLBACK_F(0, "anchored", options, N_("<text>"),
N_("generate diff using the \"anchored diff\" algorithm"),
PARSE_OPT_NONEG, diff_opt_anchored),
OPT_CALLBACK_F(0, "word-diff", options, N_("<mode>"),
N_("show word diff, using <mode> to delimit changed words"),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_word_diff),
OPT_CALLBACK_F(0, "word-diff-regex", options, N_("<regex>"),
N_("use <regex> to decide what a word is"),
PARSE_OPT_NONEG, diff_opt_word_diff_regex),
OPT_CALLBACK_F(0, "color-words", options, N_("<regex>"),
N_("equivalent to --word-diff=color --word-diff-regex=<regex>"),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_color_words),
OPT_CALLBACK_F(0, "color-moved", options, N_("<mode>"),
N_("moved lines of code are colored differently"),
PARSE_OPT_OPTARG, diff_opt_color_moved),
OPT_CALLBACK_F(0, "color-moved-ws", options, N_("<mode>"),
N_("how white spaces are ignored in --color-moved"),
0, diff_opt_color_moved_ws),
OPT_GROUP(N_("Other diff options")),
OPT_CALLBACK_F(0, "relative", options, N_("<prefix>"),
N_("when run from subdir, exclude changes outside and show relative paths"),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
diff_opt_relative),
OPT_BOOL('a', "text", &options->flags.text,
N_("treat all files as text")),
OPT_BOOL('R', NULL, &options->flags.reverse_diff,
N_("swap two inputs, reverse the diff")),
OPT_BOOL(0, "exit-code", &options->flags.exit_with_status,
N_("exit with 1 if there were differences, 0 otherwise")),
OPT_BOOL(0, "quiet", &options->flags.quick,
N_("disable all output of the program")),
OPT_BOOL(0, "ext-diff", &options->flags.allow_external,
N_("allow an external diff helper to be executed")),
OPT_CALLBACK_F(0, "textconv", options, NULL,
N_("run external text conversion filters when comparing binary files"),
PARSE_OPT_NOARG, diff_opt_textconv),
OPT_CALLBACK_F(0, "ignore-submodules", options, N_("<when>"),
N_("ignore changes to submodules in the diff generation"),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
diff_opt_ignore_submodules),
OPT_CALLBACK_F(0, "submodule", options, N_("<format>"),
N_("specify how differences in submodules are shown"),
PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
diff_opt_submodule),
OPT_SET_INT_F(0, "ita-invisible-in-index", &options->ita_invisible_in_index,
N_("hide 'git add -N' entries from the index"),
1, PARSE_OPT_NONEG),
OPT_SET_INT_F(0, "ita-visible-in-index", &options->ita_invisible_in_index,
N_("treat 'git add -N' entries as real in the index"),
0, PARSE_OPT_NONEG),
OPT_CALLBACK_F('S', NULL, options, N_("<string>"),
N_("look for differences that change the number of occurrences of the specified string"),
0, diff_opt_pickaxe_string),
OPT_CALLBACK_F('G', NULL, options, N_("<regex>"),
N_("look for differences that change the number of occurrences of the specified regex"),
0, diff_opt_pickaxe_regex),
OPT_BIT_F(0, "pickaxe-all", &options->pickaxe_opts,
N_("show all changes in the changeset with -S or -G"),
DIFF_PICKAXE_ALL, PARSE_OPT_NONEG),
OPT_BIT_F(0, "pickaxe-regex", &options->pickaxe_opts,
N_("treat <string> in -S as extended POSIX regular expression"),
DIFF_PICKAXE_REGEX, PARSE_OPT_NONEG),
OPT_FILENAME('O', NULL, &options->orderfile,
N_("control the order in which files appear in the output")),
OPT_CALLBACK_F(0, "find-object", options, N_("<object-id>"),
N_("look for differences that change the number of occurrences of the specified object"),
PARSE_OPT_NONEG, diff_opt_find_object),
OPT_CALLBACK_F(0, "diff-filter", options, N_("[(A|C|D|M|R|T|U|X|B)...[*]]"),
N_("select files by diff type"),
PARSE_OPT_NONEG, diff_opt_diff_filter),
{ OPTION_CALLBACK, 0, "output", options, N_("<file>"),
N_("Output to a specific file"),
PARSE_OPT_NONEG, NULL, 0, diff_opt_output },
OPT_END()
};
ALLOC_ARRAY(options->parseopts, ARRAY_SIZE(parseopts));
memcpy(options->parseopts, parseopts, sizeof(parseopts));
}
int diff_opt_parse(struct diff_options *options,
const char **av, int ac, const char *prefix)
{
if (!prefix)
prefix = "";
ac = parse_options(ac, av, prefix, options->parseopts, NULL,
PARSE_OPT_KEEP_DASHDASH |
PARSE_OPT_KEEP_UNKNOWN |
PARSE_OPT_NO_INTERNAL_HELP |
PARSE_OPT_ONE_SHOT |
PARSE_OPT_STOP_AT_NON_OPTION);
return ac;
}
int parse_rename_score(const char **cp_p)
{
unsigned long num, scale;
int ch, dot;
const char *cp = *cp_p;
num = 0;
scale = 1;
dot = 0;
for (;;) {
ch = *cp;
if ( !dot && ch == '.' ) {
scale = 1;
dot = 1;
} else if ( ch == '%' ) {
scale = dot ? scale*100 : 100;
cp++; /* % is always at the end */
break;
} else if ( ch >= '0' && ch <= '9' ) {
if ( scale < 100000 ) {
scale *= 10;
num = (num*10) + (ch-'0');
}
} else {
break;
}
cp++;
}
*cp_p = cp;
/* user says num divided by scale and we say internally that
* is MAX_SCORE * num / scale.
*/
return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
}
struct diff_queue_struct diff_queued_diff;
void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
{
ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
queue->queue[queue->nr++] = dp;
}
struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
struct diff_filespec *one,
struct diff_filespec *two)
{
struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
dp->one = one;
dp->two = two;
if (queue)
diff_q(queue, dp);
return dp;
}
void diff_free_filepair(struct diff_filepair *p)
{
free_filespec(p->one);
free_filespec(p->two);
free(p);
}
const char *diff_aligned_abbrev(const struct object_id *oid, int len)
{
int abblen;
const char *abbrev;
/* Do we want all 40 hex characters? */
if (len == the_hash_algo->hexsz)
return oid_to_hex(oid);
/* An abbreviated value is fine, possibly followed by an ellipsis. */
abbrev = diff_abbrev_oid(oid, len);
if (!print_sha1_ellipsis())
return abbrev;
abblen = strlen(abbrev);
/*
* In well-behaved cases, where the abbreviated result is the
* same as the requested length, append three dots after the
* abbreviation (hence the whole logic is limited to the case
* where abblen < 37); when the actual abbreviated result is a
* bit longer than the requested length, we reduce the number
* of dots so that they match the well-behaved ones. However,
* if the actual abbreviation is longer than the requested
* length by more than three, we give up on aligning, and add
* three dots anyway, to indicate that the output is not the
* full object name. Yes, this may be suboptimal, but this
* appears only in "diff --raw --abbrev" output and it is not
* worth the effort to change it now. Note that this would
* likely to work fine when the automatic sizing of default
* abbreviation length is used--we would be fed -1 in "len" in
* that case, and will end up always appending three-dots, but
* the automatic sizing is supposed to give abblen that ensures
* uniqueness across all objects (statistically speaking).
*/
if (abblen < the_hash_algo->hexsz - 3) {
static char hex[GIT_MAX_HEXSZ + 1];
if (len < abblen && abblen <= len + 2)
xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
else
xsnprintf(hex, sizeof(hex), "%s...", abbrev);
return hex;
}
return oid_to_hex(oid);
}
static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
{
int line_termination = opt->line_termination;
int inter_name_termination = line_termination ? '\t' : '\0';
fprintf(opt->file, "%s", diff_line_prefix(opt));
if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
diff_aligned_abbrev(&p->one->oid, opt->abbrev));
fprintf(opt->file, "%s ",
diff_aligned_abbrev(&p->two->oid, opt->abbrev));
}
if (p->score) {
fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
inter_name_termination);
} else {
fprintf(opt->file, "%c%c", p->status, inter_name_termination);
}
if (p->status == DIFF_STATUS_COPIED ||
p->status == DIFF_STATUS_RENAMED) {
const char *name_a, *name_b;
name_a = p->one->path;
name_b = p->two->path;
strip_prefix(opt->prefix_length, &name_a, &name_b);
write_name_quoted(name_a, opt->file, inter_name_termination);
write_name_quoted(name_b, opt->file, line_termination);
} else {
const char *name_a, *name_b;
name_a = p->one->mode ? p->one->path : p->two->path;
name_b = NULL;
strip_prefix(opt->prefix_length, &name_a, &name_b);
write_name_quoted(name_a, opt->file, line_termination);
}
}
int diff_unmodified_pair(struct diff_filepair *p)
{
/* This function is written stricter than necessary to support
* the currently implemented transformers, but the idea is to
* let transformers to produce diff_filepairs any way they want,
* and filter and clean them up here before producing the output.
*/
struct diff_filespec *one = p->one, *two = p->two;
if (DIFF_PAIR_UNMERGED(p))
return 0; /* unmerged is interesting */
/* deletion, addition, mode or type change
* and rename are all interesting.
*/
if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
DIFF_PAIR_MODE_CHANGED(p) ||
strcmp(one->path, two->path))
return 0;
/* both are valid and point at the same path. that is, we are
* dealing with a change.
*/
if (one->oid_valid && two->oid_valid &&
oideq(&one->oid, &two->oid) &&
!one->dirty_submodule && !two->dirty_submodule)
return 1; /* no change */
if (!one->oid_valid && !two->oid_valid)
return 1; /* both look at the same file on the filesystem. */
return 0;
}
static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
{
if (diff_unmodified_pair(p))
return;
if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
(DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
return; /* no tree diffs in patch format */
run_diff(p, o);
}
static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
struct diffstat_t *diffstat)
{
if (diff_unmodified_pair(p))
return;
if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
(DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
return; /* no useful stat for tree diffs */
run_diffstat(p, o, diffstat);
}
static void diff_flush_checkdiff(struct diff_filepair *p,
struct diff_options *o)
{
if (diff_unmodified_pair(p))
return;
if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
(DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
return; /* nothing to check in tree diffs */
run_checkdiff(p, o);
}
int diff_queue_is_empty(void)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i;
for (i = 0; i < q->nr; i++)
if (!diff_unmodified_pair(q->queue[i]))
return 0;
return 1;
}
#if DIFF_DEBUG
void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
{
fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
x, one ? one : "",
s->path,
DIFF_FILE_VALID(s) ? "valid" : "invalid",
s->mode,
s->oid_valid ? oid_to_hex(&s->oid) : "");
fprintf(stderr, "queue[%d] %s size %lu\n",
x, one ? one : "",
s->size);
}
void diff_debug_filepair(const struct diff_filepair *p, int i)
{
diff_debug_filespec(p->one, i, "one");
diff_debug_filespec(p->two, i, "two");
fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
p->score, p->status ? p->status : '?',
p->one->rename_used, p->broken_pair);
}
void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
{
int i;
if (msg)
fprintf(stderr, "%s\n", msg);
fprintf(stderr, "q->nr = %d\n", q->nr);
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
diff_debug_filepair(p, i);
}
}
#endif
static void diff_resolve_rename_copy(void)
{
int i;
struct diff_filepair *p;
struct diff_queue_struct *q = &diff_queued_diff;
diff_debug_queue("resolve-rename-copy", q);
for (i = 0; i < q->nr; i++) {
p = q->queue[i];
p->status = 0; /* undecided */
if (DIFF_PAIR_UNMERGED(p))
p->status = DIFF_STATUS_UNMERGED;
else if (!DIFF_FILE_VALID(p->one))
p->status = DIFF_STATUS_ADDED;
else if (!DIFF_FILE_VALID(p->two))
p->status = DIFF_STATUS_DELETED;
else if (DIFF_PAIR_TYPE_CHANGED(p))
p->status = DIFF_STATUS_TYPE_CHANGED;
/* from this point on, we are dealing with a pair
* whose both sides are valid and of the same type, i.e.
* either in-place edit or rename/copy edit.
*/
else if (DIFF_PAIR_RENAME(p)) {
/*
* A rename might have re-connected a broken
* pair up, causing the pathnames to be the
* same again. If so, that's not a rename at
* all, just a modification..
*
* Otherwise, see if this source was used for
* multiple renames, in which case we decrement
* the count, and call it a copy.
*/
if (!strcmp(p->one->path, p->two->path))
p->status = DIFF_STATUS_MODIFIED;
else if (--p->one->rename_used > 0)
p->status = DIFF_STATUS_COPIED;
else
p->status = DIFF_STATUS_RENAMED;
}
else if (!oideq(&p->one->oid, &p->two->oid) ||
p->one->mode != p->two->mode ||
p->one->dirty_submodule ||
p->two->dirty_submodule ||
is_null_oid(&p->one->oid))
p->status = DIFF_STATUS_MODIFIED;
else {
/* This is a "no-change" entry and should not
* happen anymore, but prepare for broken callers.
*/
error("feeding unmodified %s to diffcore",
p->one->path);
p->status = DIFF_STATUS_UNKNOWN;
}
}
diff_debug_queue("resolve-rename-copy done", q);
}
static int check_pair_status(struct diff_filepair *p)
{
switch (p->status) {
case DIFF_STATUS_UNKNOWN:
return 0;
case 0:
die("internal error in diff-resolve-rename-copy");
default:
return 1;
}
}
static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
{
int fmt = opt->output_format;
if (fmt & DIFF_FORMAT_CHECKDIFF)
diff_flush_checkdiff(p, opt);
else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
diff_flush_raw(p, opt);
else if (fmt & DIFF_FORMAT_NAME) {
const char *name_a, *name_b;
name_a = p->two->path;
name_b = NULL;
strip_prefix(opt->prefix_length, &name_a, &name_b);
fprintf(opt->file, "%s", diff_line_prefix(opt));
write_name_quoted(name_a, opt->file, opt->line_termination);
}
}
static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
{
struct strbuf sb = STRBUF_INIT;
if (fs->mode)
strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
else
strbuf_addf(&sb, " %s ", newdelete);
quote_c_style(fs->path, &sb, NULL, 0);
strbuf_addch(&sb, '\n');
emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
sb.buf, sb.len, 0);
strbuf_release(&sb);
}
static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
int show_name)
{
if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
struct strbuf sb = STRBUF_INIT;
strbuf_addf(&sb, " mode change %06o => %06o",
p->one->mode, p->two->mode);
if (show_name) {
strbuf_addch(&sb, ' ');
quote_c_style(p->two->path, &sb, NULL, 0);
}
strbuf_addch(&sb, '\n');
emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
sb.buf, sb.len, 0);
strbuf_release(&sb);
}
}
static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
struct diff_filepair *p)
{
struct strbuf sb = STRBUF_INIT;
struct strbuf names = STRBUF_INIT;
pprint_rename(&names, p->one->path, p->two->path);
strbuf_addf(&sb, " %s %s (%d%%)\n",
renamecopy, names.buf, similarity_index(p));
strbuf_release(&names);
emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
sb.buf, sb.len, 0);
show_mode_change(opt, p, 0);
strbuf_release(&sb);
}
static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
{
switch(p->status) {
case DIFF_STATUS_DELETED:
show_file_mode_name(opt, "delete", p->one);
break;
case DIFF_STATUS_ADDED:
show_file_mode_name(opt, "create", p->two);
break;
case DIFF_STATUS_COPIED:
show_rename_copy(opt, "copy", p);
break;
case DIFF_STATUS_RENAMED:
show_rename_copy(opt, "rename", p);
break;
default:
if (p->score) {
struct strbuf sb = STRBUF_INIT;
strbuf_addstr(&sb, " rewrite ");
quote_c_style(p->two->path, &sb, NULL, 0);
strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
sb.buf, sb.len, 0);
strbuf_release(&sb);
}
show_mode_change(opt, p, !p->score);
break;
}
}
struct patch_id_t {
git_hash_ctx *ctx;
int patchlen;
};
static int remove_space(char *line, int len)
{
int i;
char *dst = line;
unsigned char c;
for (i = 0; i < len; i++)
if (!isspace((c = line[i])))
*dst++ = c;
return dst - line;
}
void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx)
{
unsigned char hash[GIT_MAX_RAWSZ];
unsigned short carry = 0;
int i;
the_hash_algo->final_fn(hash, ctx);
the_hash_algo->init_fn(ctx);
/* 20-byte sum, with carry */
for (i = 0; i < the_hash_algo->rawsz; ++i) {
carry += result->hash[i] + hash[i];
result->hash[i] = carry;
carry >>= 8;
}
}
static void patch_id_consume(void *priv, char *line, unsigned long len)
{
struct patch_id_t *data = priv;
int new_len;
new_len = remove_space(line, len);
the_hash_algo->update_fn(data->ctx, line, new_len);
data->patchlen += new_len;
}
static void patch_id_add_string(git_hash_ctx *ctx, const char *str)
{
the_hash_algo->update_fn(ctx, str, strlen(str));
}
static void patch_id_add_mode(git_hash_ctx *ctx, unsigned mode)
{
/* large enough for 2^32 in octal */
char buf[12];
int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
the_hash_algo->update_fn(ctx, buf, len);
}
/* returns 0 upon success, and writes result into oid */
static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i;
git_hash_ctx ctx;
struct patch_id_t data;
the_hash_algo->init_fn(&ctx);
memset(&data, 0, sizeof(struct patch_id_t));
data.ctx = &ctx;
oidclr(oid);
for (i = 0; i < q->nr; i++) {
xpparam_t xpp;
xdemitconf_t xecfg;
mmfile_t mf1, mf2;
struct diff_filepair *p = q->queue[i];
int len1, len2;
memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
if (p->status == 0)
return error("internal diff status error");
if (p->status == DIFF_STATUS_UNKNOWN)
continue;
if (diff_unmodified_pair(p))
continue;
if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
(DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
continue;
if (DIFF_PAIR_UNMERGED(p))
continue;
diff_fill_oid_info(p->one, options->repo->index);
diff_fill_oid_info(p->two, options->repo->index);
len1 = remove_space(p->one->path, strlen(p->one->path));
len2 = remove_space(p->two->path, strlen(p->two->path));
patch_id_add_string(&ctx, "diff--git");
patch_id_add_string(&ctx, "a/");
the_hash_algo->update_fn(&ctx, p->one->path, len1);
patch_id_add_string(&ctx, "b/");
the_hash_algo->update_fn(&ctx, p->two->path, len2);
if (p->one->mode == 0) {
patch_id_add_string(&ctx, "newfilemode");
patch_id_add_mode(&ctx, p->two->mode);
patch_id_add_string(&ctx, "---/dev/null");
patch_id_add_string(&ctx, "+++b/");
the_hash_algo->update_fn(&ctx, p->two->path, len2);
} else if (p->two->mode == 0) {
patch_id_add_string(&ctx, "deletedfilemode");
patch_id_add_mode(&ctx, p->one->mode);
patch_id_add_string(&ctx, "---a/");
the_hash_algo->update_fn(&ctx, p->one->path, len1);
patch_id_add_string(&ctx, "+++/dev/null");
} else {
patch_id_add_string(&ctx, "---a/");
the_hash_algo->update_fn(&ctx, p->one->path, len1);
patch_id_add_string(&ctx, "+++b/");
the_hash_algo->update_fn(&ctx, p->two->path, len2);
}
if (diff_header_only)
continue;
if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
fill_mmfile(options->repo, &mf2, p->two) < 0)
return error("unable to read files to diff");
if (diff_filespec_is_binary(options->repo, p->one) ||
diff_filespec_is_binary(options->repo, p->two)) {
the_hash_algo->update_fn(&ctx, oid_to_hex(&p->one->oid),
the_hash_algo->hexsz);
the_hash_algo->update_fn(&ctx, oid_to_hex(&p->two->oid),
the_hash_algo->hexsz);
continue;
}
xpp.flags = 0;
xecfg.ctxlen = 3;
xecfg.flags = 0;
if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
patch_id_consume, &data, &xpp, &xecfg))
return error("unable to generate patch-id diff for %s",
p->one->path);
if (stable)
flush_one_hunk(oid, &ctx);
}
if (!stable)
the_hash_algo->final_fn(oid->hash, &ctx);
return 0;
}
int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i;
int result = diff_get_patch_id(options, oid, diff_header_only, stable);
for (i = 0; i < q->nr; i++)
diff_free_filepair(q->queue[i]);
free(q->queue);
DIFF_QUEUE_CLEAR(q);
return result;
}
static int is_summary_empty(const struct diff_queue_struct *q)
{
int i;
for (i = 0; i < q->nr; i++) {
const struct diff_filepair *p = q->queue[i];
switch (p->status) {
case DIFF_STATUS_DELETED:
case DIFF_STATUS_ADDED:
case DIFF_STATUS_COPIED:
case DIFF_STATUS_RENAMED:
return 0;
default:
if (p->score)
return 0;
if (p->one->mode && p->two->mode &&
p->one->mode != p->two->mode)
return 0;
break;
}
}
return 1;
}
static const char rename_limit_warning[] =
N_("inexact rename detection was skipped due to too many files.");
static const char degrade_cc_to_c_warning[] =
N_("only found copies from modified paths due to too many files.");
static const char rename_limit_advice[] =
N_("you may want to set your %s variable to at least "
"%d and retry the command.");
void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
{
fflush(stdout);
if (degraded_cc)
warning(_(degrade_cc_to_c_warning));
else if (needed)
warning(_(rename_limit_warning));
else
return;
if (0 < needed)
warning(_(rename_limit_advice), varname, needed);
}
static void diff_flush_patch_all_file_pairs(struct diff_options *o)
{
int i;
static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
struct diff_queue_struct *q = &diff_queued_diff;
if (WSEH_NEW & WS_RULE_MASK)
BUG("WS rules bit mask overlaps with diff symbol flags");
if (o->color_moved)
o->emitted_symbols = &esm;
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (check_pair_status(p))
diff_flush_patch(p, o);
}
if (o->emitted_symbols) {
if (o->color_moved) {
struct hashmap add_lines, del_lines;
if (o->color_moved_ws_handling &
COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
hashmap_init(&del_lines, moved_entry_cmp, o, 0);
hashmap_init(&add_lines, moved_entry_cmp, o, 0);
add_lines_to_move_detection(o, &add_lines, &del_lines);
mark_color_as_moved(o, &add_lines, &del_lines);
if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
dim_moved_lines(o);
hashmap_free_entries(&add_lines, struct moved_entry,
ent);
hashmap_free_entries(&del_lines, struct moved_entry,
ent);
}
for (i = 0; i < esm.nr; i++)
emit_diff_symbol_from_struct(o, &esm.buf[i]);
for (i = 0; i < esm.nr; i++)
free((void *)esm.buf[i].line);
esm.nr = 0;
o->emitted_symbols = NULL;
}
}
void diff_flush(struct diff_options *options)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i, output_format = options->output_format;
int separator = 0;
int dirstat_by_line = 0;
/*
* Order: raw, stat, summary, patch
* or: name/name-status/checkdiff (other bits clear)
*/
if (!q->nr)
goto free_queue;
if (output_format & (DIFF_FORMAT_RAW |
DIFF_FORMAT_NAME |
DIFF_FORMAT_NAME_STATUS |
DIFF_FORMAT_CHECKDIFF)) {
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (check_pair_status(p))
flush_one_pair(p, options);
}
separator++;
}
if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
dirstat_by_line = 1;
if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
dirstat_by_line) {
struct diffstat_t diffstat;
compute_diffstat(options, &diffstat, q);
if (output_format & DIFF_FORMAT_NUMSTAT)
show_numstat(&diffstat, options);
if (output_format & DIFF_FORMAT_DIFFSTAT)
show_stats(&diffstat, options);
if (output_format & DIFF_FORMAT_SHORTSTAT)
show_shortstats(&diffstat, options);
if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
show_dirstat_by_line(&diffstat, options);
free_diffstat_info(&diffstat);
separator++;
}
if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
show_dirstat(options);
if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
for (i = 0; i < q->nr; i++) {
diff_summary(options, q->queue[i]);
}
separator++;
}
if (output_format & DIFF_FORMAT_NO_OUTPUT &&
options->flags.exit_with_status &&
options->flags.diff_from_contents) {
/*
* run diff_flush_patch for the exit status. setting
* options->file to /dev/null should be safe, because we
* aren't supposed to produce any output anyway.
*/
if (options->close_file)
fclose(options->file);
options->file = xfopen("/dev/null", "w");
options->close_file = 1;
options->color_moved = 0;
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (check_pair_status(p))
diff_flush_patch(p, options);
if (options->found_changes)
break;
}
}
if (output_format & DIFF_FORMAT_PATCH) {
if (separator) {
emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
if (options->stat_sep)
/* attach patch instead of inline */
emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
NULL, 0, 0);
}
diff_flush_patch_all_file_pairs(options);
}
if (output_format & DIFF_FORMAT_CALLBACK)
options->format_callback(q, options, options->format_callback_data);
for (i = 0; i < q->nr; i++)
diff_free_filepair(q->queue[i]);
free_queue:
free(q->queue);
DIFF_QUEUE_CLEAR(q);
if (options->close_file)
fclose(options->file);
/*
* Report the content-level differences with HAS_CHANGES;
* diff_addremove/diff_change does not set the bit when
* DIFF_FROM_CONTENTS is in effect (e.g. with -w).
*/
if (options->flags.diff_from_contents) {
if (options->found_changes)
options->flags.has_changes = 1;
else
options->flags.has_changes = 0;
}
}
static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
{
return (((p->status == DIFF_STATUS_MODIFIED) &&
((p->score &&
filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
(!p->score &&
filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
((p->status != DIFF_STATUS_MODIFIED) &&
filter_bit_tst(p->status, options)));
}
static void diffcore_apply_filter(struct diff_options *options)
{
int i;
struct diff_queue_struct *q = &diff_queued_diff;
struct diff_queue_struct outq;
DIFF_QUEUE_CLEAR(&outq);
if (!options->filter)
return;
if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
int found;
for (i = found = 0; !found && i < q->nr; i++) {
if (match_filter(options, q->queue[i]))
found++;
}
if (found)
return;
/* otherwise we will clear the whole queue
* by copying the empty outq at the end of this
* function, but first clear the current entries
* in the queue.
*/
for (i = 0; i < q->nr; i++)
diff_free_filepair(q->queue[i]);
}
else {
/* Only the matching ones */
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (match_filter(options, p))
diff_q(&outq, p);
else
diff_free_filepair(p);
}
}
free(q->queue);
*q = outq;
}
/* Check whether two filespecs with the same mode and size are identical */
static int diff_filespec_is_identical(struct repository *r,
struct diff_filespec *one,
struct diff_filespec *two)
{
if (S_ISGITLINK(one->mode))
return 0;
if (diff_populate_filespec(r, one, 0))
return 0;
if (diff_populate_filespec(r, two, 0))
return 0;
return !memcmp(one->data, two->data, one->size);
}
static int diff_filespec_check_stat_unmatch(struct repository *r,
struct diff_filepair *p)
{
if (p->done_skip_stat_unmatch)
return p->skip_stat_unmatch_result;
p->done_skip_stat_unmatch = 1;
p->skip_stat_unmatch_result = 0;
/*
* 1. Entries that come from stat info dirtiness
* always have both sides (iow, not create/delete),
* one side of the object name is unknown, with
* the same mode and size. Keep the ones that
* do not match these criteria. They have real
* differences.
*
* 2. At this point, the file is known to be modified,
* with the same mode and size, and the object
* name of one side is unknown. Need to inspect
* the identical contents.
*/
if (!DIFF_FILE_VALID(p->one) || /* (1) */
!DIFF_FILE_VALID(p->two) ||
(p->one->oid_valid && p->two->oid_valid) ||
(p->one->mode != p->two->mode) ||
diff_populate_filespec(r, p->one, CHECK_SIZE_ONLY) ||
diff_populate_filespec(r, p->two, CHECK_SIZE_ONLY) ||
(p->one->size != p->two->size) ||
!diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
p->skip_stat_unmatch_result = 1;
return p->skip_stat_unmatch_result;
}
static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
{
int i;
struct diff_queue_struct *q = &diff_queued_diff;
struct diff_queue_struct outq;
DIFF_QUEUE_CLEAR(&outq);
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
diff_q(&outq, p);
else {
/*
* The caller can subtract 1 from skip_stat_unmatch
* to determine how many paths were dirty only
* due to stat info mismatch.
*/
if (!diffopt->flags.no_index)
diffopt->skip_stat_unmatch++;
diff_free_filepair(p);
}
}
free(q->queue);
*q = outq;
}
static int diffnamecmp(const void *a_, const void *b_)
{
const struct diff_filepair *a = *((const struct diff_filepair **)a_);
const struct diff_filepair *b = *((const struct diff_filepair **)b_);
const char *name_a, *name_b;
name_a = a->one ? a->one->path : a->two->path;
name_b = b->one ? b->one->path : b->two->path;
return strcmp(name_a, name_b);
}
void diffcore_fix_diff_index(void)
{
struct diff_queue_struct *q = &diff_queued_diff;
QSORT(q->queue, q->nr, diffnamecmp);
}
static void add_if_missing(struct repository *r,
struct oid_array *to_fetch,
const struct diff_filespec *filespec)
{
if (filespec && filespec->oid_valid &&
!S_ISGITLINK(filespec->mode) &&
oid_object_info_extended(r, &filespec->oid, NULL,
OBJECT_INFO_FOR_PREFETCH))
oid_array_append(to_fetch, &filespec->oid);
}
void diffcore_std(struct diff_options *options)
{
if (options->repo == the_repository && has_promisor_remote()) {
/*
* Prefetch the diff pairs that are about to be flushed.
*/
int i;
struct diff_queue_struct *q = &diff_queued_diff;
struct oid_array to_fetch = OID_ARRAY_INIT;
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
add_if_missing(options->repo, &to_fetch, p->one);
add_if_missing(options->repo, &to_fetch, p->two);
}
if (to_fetch.nr)
/*
* NEEDSWORK: Consider deduplicating the OIDs sent.
*/
promisor_remote_get_direct(options->repo,
to_fetch.oid, to_fetch.nr);
oid_array_clear(&to_fetch);
}
/* NOTE please keep the following in sync with diff_tree_combined() */
if (options->skip_stat_unmatch)
diffcore_skip_stat_unmatch(options);
if (!options->found_follow) {
/* See try_to_follow_renames() in tree-diff.c */
if (options->break_opt != -1)
diffcore_break(options->repo,
options->break_opt);
if (options->detect_rename)
diffcore_rename(options);
if (options->break_opt != -1)
diffcore_merge_broken();
}
if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
diffcore_pickaxe(options);
if (options->orderfile)
diffcore_order(options->orderfile);
if (!options->found_follow)
/* See try_to_follow_renames() in tree-diff.c */
diff_resolve_rename_copy();
diffcore_apply_filter(options);
if (diff_queued_diff.nr && !options->flags.diff_from_contents)
options->flags.has_changes = 1;
else
options->flags.has_changes = 0;
options->found_follow = 0;
}
int diff_result_code(struct diff_options *opt, int status)
{
int result = 0;
diff_warn_rename_limit("diff.renameLimit",
opt->needed_rename_limit,
opt->degraded_cc_to_c);
if (!opt->flags.exit_with_status &&
!(opt->output_format & DIFF_FORMAT_CHECKDIFF))
return status;
if (opt->flags.exit_with_status &&
opt->flags.has_changes)
result |= 01;
if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
opt->flags.check_failed)
result |= 02;
return result;
}
int diff_can_quit_early(struct diff_options *opt)
{
return (opt->flags.quick &&
!opt->filter &&
opt->flags.has_changes);
}
/*
* Shall changes to this submodule be ignored?
*
* Submodule changes can be configured to be ignored separately for each path,
* but that configuration can be overridden from the command line.
*/
static int is_submodule_ignored(const char *path, struct diff_options *options)
{
int ignored = 0;
struct diff_flags orig_flags = options->flags;
if (!options->flags.override_submodule_config)
set_diffopt_flags_from_submodule_config(options, path);
if (options->flags.ignore_submodules)
ignored = 1;
options->flags = orig_flags;
return ignored;
}
void compute_diffstat(struct diff_options *options,
struct diffstat_t *diffstat,
struct diff_queue_struct *q)
{
int i;
memset(diffstat, 0, sizeof(struct diffstat_t));
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (check_pair_status(p))
diff_flush_stat(p, options, diffstat);
}
}
void diff_addremove(struct diff_options *options,
int addremove, unsigned mode,
const struct object_id *oid,
int oid_valid,
const char *concatpath, unsigned dirty_submodule)
{
struct diff_filespec *one, *two;
if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
return;
/* This may look odd, but it is a preparation for
* feeding "there are unchanged files which should
* not produce diffs, but when you are doing copy
* detection you would need them, so here they are"
* entries to the diff-core. They will be prefixed
* with something like '=' or '*' (I haven't decided
* which but should not make any difference).
* Feeding the same new and old to diff_change()
* also has the same effect.
* Before the final output happens, they are pruned after
* merged into rename/copy pairs as appropriate.
*/
if (options->flags.reverse_diff)
addremove = (addremove == '+' ? '-' :
addremove == '-' ? '+' : addremove);
if (options->prefix &&
strncmp(concatpath, options->prefix, options->prefix_length))
return;
one = alloc_filespec(concatpath);
two = alloc_filespec(concatpath);
if (addremove != '+')
fill_filespec(one, oid, oid_valid, mode);
if (addremove != '-') {
fill_filespec(two, oid, oid_valid, mode);
two->dirty_submodule = dirty_submodule;
}
diff_queue(&diff_queued_diff, one, two);
if (!options->flags.diff_from_contents)
options->flags.has_changes = 1;
}
void diff_change(struct diff_options *options,
unsigned old_mode, unsigned new_mode,
const struct object_id *old_oid,
const struct object_id *new_oid,
int old_oid_valid, int new_oid_valid,
const char *concatpath,
unsigned old_dirty_submodule, unsigned new_dirty_submodule)
{
struct diff_filespec *one, *two;
struct diff_filepair *p;
if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
is_submodule_ignored(concatpath, options))
return;
if (options->flags.reverse_diff) {
SWAP(old_mode, new_mode);
SWAP(old_oid, new_oid);
SWAP(old_oid_valid, new_oid_valid);
SWAP(old_dirty_submodule, new_dirty_submodule);
}
if (options->prefix &&
strncmp(concatpath, options->prefix, options->prefix_length))
return;
one = alloc_filespec(concatpath);
two = alloc_filespec(concatpath);
fill_filespec(one, old_oid, old_oid_valid, old_mode);
fill_filespec(two, new_oid, new_oid_valid, new_mode);
one->dirty_submodule = old_dirty_submodule;
two->dirty_submodule = new_dirty_submodule;
p = diff_queue(&diff_queued_diff, one, two);
if (options->flags.diff_from_contents)
return;
if (options->flags.quick && options->skip_stat_unmatch &&
!diff_filespec_check_stat_unmatch(options->repo, p))
return;
options->flags.has_changes = 1;
}
struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
{
struct diff_filepair *pair;
struct diff_filespec *one, *two;
if (options->prefix &&
strncmp(path, options->prefix, options->prefix_length))
return NULL;
one = alloc_filespec(path);
two = alloc_filespec(path);
pair = diff_queue(&diff_queued_diff, one, two);
pair->is_unmerged = 1;
return pair;
}
static char *run_textconv(struct repository *r,
const char *pgm,
struct diff_filespec *spec,
size_t *outsize)
{
struct diff_tempfile *temp;
const char *argv[3];
const char **arg = argv;
struct child_process child = CHILD_PROCESS_INIT;
struct strbuf buf = STRBUF_INIT;
int err = 0;
temp = prepare_temp_file(r, spec->path, spec);
*arg++ = pgm;
*arg++ = temp->name;
*arg = NULL;
child.use_shell = 1;
child.argv = argv;
child.out = -1;
if (start_command(&child)) {
remove_tempfile();
return NULL;
}
if (strbuf_read(&buf, child.out, 0) < 0)
err = error("error reading from textconv command '%s'", pgm);
close(child.out);
if (finish_command(&child) || err) {
strbuf_release(&buf);
remove_tempfile();
return NULL;
}
remove_tempfile();
return strbuf_detach(&buf, outsize);
}
size_t fill_textconv(struct repository *r,
struct userdiff_driver *driver,
struct diff_filespec *df,
char **outbuf)
{
size_t size;
if (!driver) {
if (!DIFF_FILE_VALID(df)) {
*outbuf = "";
return 0;
}
if (diff_populate_filespec(r, df, 0))
die("unable to read files to diff");
*outbuf = df->data;
return df->size;
}
if (!driver->textconv)
BUG("fill_textconv called with non-textconv driver");
if (driver->textconv_cache && df->oid_valid) {
*outbuf = notes_cache_get(driver->textconv_cache,
&df->oid,
&size);
if (*outbuf)
return size;
}
*outbuf = run_textconv(r, driver->textconv, df, &size);
if (!*outbuf)
die("unable to read files to diff");
if (driver->textconv_cache && df->oid_valid) {
/* ignore errors, as we might be in a readonly repository */
notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
size);
/*
* we could save up changes and flush them all at the end,
* but we would need an extra call after all diffing is done.
* Since generating a cache entry is the slow path anyway,
* this extra overhead probably isn't a big deal.
*/
notes_cache_write(driver->textconv_cache);
}
return size;
}
int textconv_object(struct repository *r,
const char *path,
unsigned mode,
const struct object_id *oid,
int oid_valid,
char **buf,
unsigned long *buf_size)
{
struct diff_filespec *df;
struct userdiff_driver *textconv;
df = alloc_filespec(path);
fill_filespec(df, oid, oid_valid, mode);
textconv = get_textconv(r, df);
if (!textconv) {
free_filespec(df);
return 0;
}
*buf_size = fill_textconv(r, textconv, df, buf);
free_filespec(df);
return 1;
}
void setup_diff_pager(struct diff_options *opt)
{
/*
* If the user asked for our exit code, then either they want --quiet
* or --exit-code. We should definitely not bother with a pager in the
* former case, as we will generate no output. Since we still properly
* report our exit code even when a pager is run, we _could_ run a
* pager with --exit-code. But since we have not done so historically,
* and because it is easy to find people oneline advising "git diff
* --exit-code" in hooks and other scripts, we do not do so.
*/
if (!opt->flags.exit_with_status &&
check_pager_config("diff") != 0)
setup_pager();
}
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