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git/diff.c
Junio C Hamano 81eab6871e Merge branch 'js/range-diff' 
"git tbdiff" that lets us compare individual patches in two
iterations of a topic has been rewritten and made into a built-in
command.

* js/range-diff: (21 commits)
  range-diff: use dim/bold cues to improve dual color mode
  range-diff: make --dual-color the default mode
  range-diff: left-pad patch numbers
  completion: support `git range-diff`
  range-diff: populate the man page
  range-diff --dual-color: skip white-space warnings
  range-diff: offer to dual-color the diffs
  diff: add an internal option to dual-color diffs of diffs
  color: add the meta color GIT_COLOR_REVERSE
  range-diff: use color for the commit pairs
  range-diff: add tests
  range-diff: do not show "function names" in hunk headers
  range-diff: adjust the output of the commit pairs
  range-diff: suppress the diff headers
  range-diff: indent the diffs just like tbdiff
  range-diff: right-trim commit messages
  range-diff: also show the diff between patches
  range-diff: improve the order of the shown commits
  range-diff: first rudimentary implementation
  Introduce `range-diff` to compare iterations of a topic branch
  ...
2018-08-20 11:33:53 -07:00

6399 lines
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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 "help.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",
};
static NORETURN void die_want_option(const char *option_name)
{
die(_("option '%s' requires a value"), option_name);
}
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;
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;
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 int 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, "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
error(_("ignoring unknown color-moved-ws mode '%s'"), sb.buf);
strbuf_release(&sb);
}
if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
(ret & XDF_WHITESPACE_FLAGS))
die(_("color-moved-ws: allow-indentation-change cannot be combined with other white space modes"));
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")) {
int cm = parse_color_moved_ws(value);
if (cm < 0)
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 = 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(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(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 diff_filespec *one)
{
if (!DIFF_FILE_VALID(one))
return 0;
diff_populate_filespec(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, unsigned reverse, const char *reset,
int first, const char *line, int len)
{
int has_trailing_newline, has_trailing_carriage_return;
int nofirst;
FILE *file = o->file;
if (first)
fputs(diff_line_prefix(o), file);
else if (!len)
return;
if (len == 0) {
has_trailing_newline = (first == '\n');
has_trailing_carriage_return = (!has_trailing_newline &&
(first == '\r'));
nofirst = has_trailing_newline || has_trailing_carriage_return;
} else {
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--;
nofirst = 0;
}
if (len || !nofirst) {
if (reverse && want_color(o->use_color))
fputs(GIT_COLOR_REVERSE, file);
fputs(set, file);
if (first && !nofirst)
fputc(first, file);
fwrite(line, len, 1, file);
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, 0, reset, line[0], line+1, len-1);
}
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;
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 ws_delta *wsd;
};
/**
* The struct ws_delta holds white space differences between moved lines, i.e.
* between '+' and '-' lines that have been detected to be a move.
* The string contains the difference in leading white spaces, before the
* rest of the line is compared using the white space config for move
* coloring. The current_longer indicates if the first string in the
* comparision is longer than the second.
*/
struct ws_delta {
char *string;
unsigned int current_longer : 1;
};
#define WS_DELTA_INIT { NULL, 0 }
static int compute_ws_delta(const struct emitted_diff_symbol *a,
const struct emitted_diff_symbol *b,
struct ws_delta *out)
{
const struct emitted_diff_symbol *longer = a->len > b->len ? a : b;
const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
int d = longer->len - shorter->len;
out->string = xmemdupz(longer->line, d);
out->current_longer = (a == longer);
return !strncmp(longer->line + d, shorter->line, shorter->len);
}
static int cmp_in_block_with_wsd(const struct diff_options *o,
const struct moved_entry *cur,
const struct moved_entry *match,
struct moved_entry *pmb,
int n)
{
struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
int al = cur->es->len, cl = l->len;
const char *a = cur->es->line,
*b = match->es->line,
*c = l->line;
int wslen;
/*
* 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.
*/
if (strcmp(a, b))
return 1;
if (!pmb->wsd)
/*
* No white space delta was carried forward? This can happen
* when we exit early in this function and do not carry
* forward ws.
*/
return 1;
/*
* The indent changes of the block are known and carried forward in
* pmb->wsd; however we need to check if the indent changes of the
* current line are still the same as before.
*
* To do so we need to compare 'l' to 'cur', adjusting the
* one of them for the white spaces, depending which was longer.
*/
wslen = strlen(pmb->wsd->string);
if (pmb->wsd->current_longer) {
c += wslen;
cl -= wslen;
} else {
a += wslen;
al -= wslen;
}
if (strcmp(a, c))
return 1;
return 0;
}
static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
const void *entry,
const void *entry_or_key,
const void *keydata)
{
const struct diff_options *diffopt = hashmap_cmp_fn_data;
const struct moved_entry *a = entry;
const struct moved_entry *b = entry_or_key;
unsigned flags = diffopt->color_moved_ws_handling
& XDF_WHITESPACE_FLAGS;
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;
ret->ent.hash = xdiff_hash_string(l->line, l->len, flags);
ret->es = l;
ret->next_line = NULL;
ret->wsd = 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;
}
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);
prev_line = key;
}
}
static void pmb_advance_or_null(struct diff_options *o,
struct moved_entry *match,
struct hashmap *hm,
struct moved_entry **pmb,
int pmb_nr)
{
int i;
for (i = 0; i < pmb_nr; i++) {
struct moved_entry *prev = pmb[i];
struct moved_entry *cur = (prev && prev->next_line) ?
prev->next_line : NULL;
if (cur && !hm->cmpfn(o, cur, match, NULL)) {
pmb[i] = cur;
} else {
pmb[i] = NULL;
}
}
}
static void pmb_advance_or_null_multi_match(struct diff_options *o,
struct moved_entry *match,
struct hashmap *hm,
struct moved_entry **pmb,
int pmb_nr, int n)
{
int i;
char *got_match = xcalloc(1, pmb_nr);
for (; match; match = hashmap_get_next(hm, match)) {
for (i = 0; i < pmb_nr; i++) {
struct moved_entry *prev = pmb[i];
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]) {
/* Carry the white space delta forward */
pmb[i]->next_line->wsd = pmb[i]->wsd;
pmb[i] = pmb[i]->next_line;
} else
pmb[i] = NULL;
}
}
static int shrink_potential_moved_blocks(struct moved_entry **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])
lp++;
/* lp points at the first NULL now */
while (rp > -1 && !pmb[rp])
rp--;
/* rp points at the last non-NULL */
if (lp < pmb_nr && rp > -1 && lp < rp) {
pmb[lp] = pmb[rp];
if (pmb[rp]->wsd) {
free(pmb[rp]->wsd->string);
FREE_AND_NULL(pmb[rp]->wsd);
}
pmb[rp] = NULL;
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.
*
* NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
* Think of a way to unify them.
*/
static void 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;
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;
}
}
for (i = 1; i < block_length + 1; i++)
o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
}
/* 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_entry **pmb = NULL; /* potentially moved blocks */
int pmb_nr = 0, pmb_alloc = 0;
int n, flipped_block = 1, 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];
switch (l->s) {
case DIFF_SYMBOL_PLUS:
hm = del_lines;
key = prepare_entry(o, n);
match = hashmap_get(hm, key, NULL);
free(key);
break;
case DIFF_SYMBOL_MINUS:
hm = add_lines;
key = prepare_entry(o, n);
match = hashmap_get(hm, key, NULL);
free(key);
break;
default:
flipped_block = 1;
}
if (!match) {
adjust_last_block(o, n, block_length);
pmb_nr = 0;
block_length = 0;
continue;
}
l->flags |= DIFF_SYMBOL_MOVED_LINE;
if (o->color_moved == COLOR_MOVED_PLAIN)
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.
*/
for (; match; match = hashmap_get_next(hm, match)) {
ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
if (o->color_moved_ws_handling &
COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
struct ws_delta *wsd = xmalloc(sizeof(*match->wsd));
if (compute_ws_delta(l, match->es, wsd)) {
match->wsd = wsd;
pmb[pmb_nr++] = match;
} else
free(wsd);
} else {
pmb[pmb_nr++] = match;
}
}
flipped_block = (flipped_block + 1) % 2;
adjust_last_block(o, n, block_length);
block_length = 0;
}
block_length++;
if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
}
adjust_last_block(o, n, block_length);
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, const char *reset,
const char *line, int len,
const char *set_sign, char sign,
unsigned ws_rule, int blank_at_eof)
{
const char *ws = NULL;
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, 0, reset, sign, line, len);
else if (!ws) {
/* Emit just the prefix, then the rest. */
emit_line_0(o, set_sign ? set_sign : set, !!set_sign, reset,
sign, "", 0);
emit_line_0(o, set, 0, reset, 0, line, len);
} else if (blank_at_eof)
/* Blank line at EOF - paint '+' as well */
emit_line_0(o, ws, 0, reset, sign, line, len);
else {
/* Emit just the prefix, then the rest. */
emit_line_0(o, set_sign ? set_sign : set, !!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, 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, reset, line, len, set_sign, ' ',
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, reset, line, len, set_sign, '+',
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, reset, line, len, set_sign, '-',
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, 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(const char *reset,
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(const char *reset,
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(const char *reset,
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);
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;
const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
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(reset, ecb, data, len);
} else {
ecb->lno_in_postimage++;
emit_add_line(reset, 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(textconv_one, one, &data_one);
size_two = fill_textconv(textconv_two, two, &data_two);
memset(&ecbdata, 0, sizeof(ecbdata));
ecbdata.color_diff = want_color(o->use_color);
ecbdata.ws_rule = whitespace_rule(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, char *line, unsigned long len)
{
struct diff_words_data *diff_words = priv;
struct diff_words_style *style = diff_words->style;
int minus_first, minus_len, plus_first, plus_len;
const char *minus_begin, *minus_end, *plus_begin, *plus_end;
struct diff_options *opt = diff_words->opt;
const char *line_prefix;
if (line[0] != '@' || parse_hunk_header(line, len,
&minus_first, &minus_len, &plus_first, &plus_len))
return;
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, 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)
{
/* Use already-loaded driver */
if (one->driver)
return;
if (S_ISREG(one->mode))
one->driver = userdiff_find_by_path(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)
{
diff_filespec_load_driver(one);
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);
if (!o->word_regex)
o->word_regex = userdiff_word_regex(two);
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(struct emit_callback *ecb, 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;
const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
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(ecbdata, 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(reset, ecbdata, line + 1, len - 1);
break;
case '-':
ecbdata->lno_in_preimage++;
emit_del_line(reset, ecbdata, line + 1, len - 1);
break;
case ' ':
ecbdata->lno_in_postimage++;
ecbdata->lno_in_preimage++;
emit_context_line(reset, 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);
}
}
struct diffstat_t {
int nr;
int alloc;
struct diffstat_file {
char *from_name;
char *name;
char *print_name;
const char *comments;
unsigned is_unmerged:1;
unsigned is_binary:1;
unsigned is_renamed:1;
unsigned is_interesting:1;
uintmax_t added, deleted;
} **files;
};
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;
int content_changed;
name = p->two->path ? p->two->path : p->one->path;
if (p->one->oid_valid && p->two->oid_valid)
content_changed = oidcmp(&p->one->oid, &p->two->oid);
else
content_changed = 1;
if (!content_changed) {
/*
* 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(p->one, 0);
diff_populate_filespec(p->two, 0);
diffcore_count_changes(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(p->one, CHECK_SIZE_ONLY);
copied = added = 0;
diff_free_filespec_data(p->one);
} else if (DIFF_FILE_VALID(p->two)) {
diff_populate_filespec(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 content_changed is true, 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);
}
static 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(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++;
} else if (line[0] == '@') {
char *plus = strchr(line, '+');
if (plus)
data->lineno = strtol(plus, NULL, 10) - 1;
else
die("invalid diff");
}
}
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("%lu", 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 diff_filespec *one)
{
if (one->is_binary == -1) {
diff_filespec_load_driver(one);
if (one->driver->binary != -1)
one->is_binary = one->driver->binary;
else {
if (!one->data && DIFF_FILE_VALID(one))
diff_populate_filespec(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_filespec *one)
{
diff_filespec_load_driver(one);
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 diff_filespec *one)
{
if (!DIFF_FILE_VALID(one))
return NULL;
diff_filespec_load_driver(one);
return userdiff_get_textconv(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(one);
textconv_two = get_textconv(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(one)) &&
(textconv_two || !diff_filespec_is_binary(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(one)) ||
(!textconv_two && diff_filespec_is_binary(two)) )) {
struct strbuf sb = STRBUF_INIT;
if (!one->data && !two->data &&
S_ISREG(one->mode) && S_ISREG(two->mode) &&
!o->flags.binary) {
if (!oidcmp(&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(&mf1, one) < 0 || fill_mmfile(&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 = getenv("GIT_DIFF_OPTS");
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(textconv_one, one, &mf1.ptr);
mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
pe = diff_funcname_pattern(one);
if (!pe)
pe = diff_funcname_pattern(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(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);
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, 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 = !oidcmp(&one->oid, &two->oid);
if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
data->is_binary = 1;
if (same_contents) {
data->added = 0;
data->deleted = 0;
} else {
data->added = diff_filespec_size(two);
data->deleted = diff_filespec_size(one);
}
}
else if (complete_rewrite) {
diff_populate_filespec(one, 0);
diff_populate_filespec(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(&mf1, one) < 0 || fill_mmfile(&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, 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(attr_path);
data.conflict_marker_size = ll_merge_marker_size(attr_path);
if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&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(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, &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(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 (!active_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(&the_index, name))
return 0;
len = strlen(name);
pos = cache_name_pos(name, len);
if (pos < 0)
return 0;
ce = active_cache[pos];
/*
* This is not the sha1 we are looking for, or
* unreusable because it is not a regular file.
*/
if (oidcmp(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) && !ce_match_stat(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 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(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(&the_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(&the_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(the_repository, &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(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(&the_index, 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(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(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(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(one, 0))
die("cannot read data blob for %s", one->path);
prep_temp_blob(name, temp, one->data, one->size,
&one->oid, one->mode);
}
return temp;
}
static void add_external_diff_name(struct argv_array *argv,
const char *name,
struct diff_filespec *df)
{
struct diff_tempfile *temp = prepare_temp_file(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,
int complete_rewrite,
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(&argv, name, one);
if (!other)
add_external_diff_name(&argv, name, two);
else {
add_external_diff_name(&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);
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 && oidcmp(&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(&mf, one) && diff_filespec_is_binary(one)) ||
(!fill_mmfile(&mf, two) && diff_filespec_is_binary(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 = userdiff_find_by_path(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,
complete_rewrite, 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)
{
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(&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 && **namep != '/') {
*namep += prefix_length;
if (**namep == '/')
++*namep;
}
if (*otherp && **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);
diff_fill_oid_info(two);
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);
diff_fill_oid_info(p->two);
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);
diff_fill_oid_info(p->two);
builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
}
void diff_setup(struct diff_options *options)
{
memcpy(options, &default_diff_options, sizeof(*options));
options->file = stdout;
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;
}
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;
}
static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
{
char c, *eq;
int len;
if (*arg != '-')
return 0;
c = *++arg;
if (!c)
return 0;
if (c == arg_short) {
c = *++arg;
if (!c)
return 1;
if (val && isdigit(c)) {
char *end;
int n = strtoul(arg, &end, 10);
if (*end)
return 0;
*val = n;
return 1;
}
return 0;
}
if (c != '-')
return 0;
arg++;
eq = strchrnul(arg, '=');
len = eq - arg;
if (!len || strncmp(arg, arg_long, len))
return 0;
if (*eq) {
int n;
char *end;
if (!isdigit(*++eq))
return 0;
n = strtoul(eq, &end, 10);
if (*end)
return 0;
*val = n;
}
return 1;
}
static int diff_scoreopt_parse(const char *opt);
static inline int short_opt(char opt, const char **argv,
const char **optarg)
{
const char *arg = argv[0];
if (arg[0] != '-' || arg[1] != opt)
return 0;
if (arg[2] != '\0') {
*optarg = arg + 2;
return 1;
}
if (!argv[1])
die("Option '%c' requires a value", opt);
*optarg = argv[1];
return 2;
}
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 stat_opt(struct diff_options *options, const char **av)
{
const char *arg = av[0];
char *end;
int width = options->stat_width;
int name_width = options->stat_name_width;
int graph_width = options->stat_graph_width;
int count = options->stat_count;
int argcount = 1;
if (!skip_prefix(arg, "--stat", &arg))
BUG("stat option does not begin with --stat: %s", arg);
end = (char *)arg;
switch (*arg) {
case '-':
if (skip_prefix(arg, "-width", &arg)) {
if (*arg == '=')
width = strtoul(arg + 1, &end, 10);
else if (!*arg && !av[1])
die_want_option("--stat-width");
else if (!*arg) {
width = strtoul(av[1], &end, 10);
argcount = 2;
}
} else if (skip_prefix(arg, "-name-width", &arg)) {
if (*arg == '=')
name_width = strtoul(arg + 1, &end, 10);
else if (!*arg && !av[1])
die_want_option("--stat-name-width");
else if (!*arg) {
name_width = strtoul(av[1], &end, 10);
argcount = 2;
}
} else if (skip_prefix(arg, "-graph-width", &arg)) {
if (*arg == '=')
graph_width = strtoul(arg + 1, &end, 10);
else if (!*arg && !av[1])
die_want_option("--stat-graph-width");
else if (!*arg) {
graph_width = strtoul(av[1], &end, 10);
argcount = 2;
}
} else if (skip_prefix(arg, "-count", &arg)) {
if (*arg == '=')
count = strtoul(arg + 1, &end, 10);
else if (!*arg && !av[1])
die_want_option("--stat-count");
else if (!*arg) {
count = strtoul(av[1], &end, 10);
argcount = 2;
}
}
break;
case '=':
width = strtoul(arg+1, &end, 10);
if (*end == ',')
name_width = strtoul(end+1, &end, 10);
if (*end == ',')
count = strtoul(end+1, &end, 10);
}
/* Important! This checks all the error cases! */
if (*end)
return 0;
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 argcount;
}
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 int parse_submodule_opt(struct diff_options *options, const char *value)
{
if (parse_submodule_params(options, value))
die(_("Failed to parse --submodule option parameter: '%s'"),
value);
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];
}
static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
{
int i, optch;
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 optarg[i];
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 parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
{
int val = parse_ws_error_highlight(arg);
if (val < 0) {
error("unknown value after ws-error-highlight=%.*s",
-1 - val, arg);
return 0;
}
opt->ws_error_highlight = val;
return 1;
}
static int parse_objfind_opt(struct diff_options *opt, const char *arg)
{
struct object_id oid;
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 1;
}
int diff_opt_parse(struct diff_options *options,
const char **av, int ac, const char *prefix)
{
const char *arg = av[0];
const char *optarg;
int argcount;
if (!prefix)
prefix = "";
/* Output format options */
if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
|| opt_arg(arg, 'U', "unified", &options->context))
enable_patch_output(&options->output_format);
else if (!strcmp(arg, "--raw"))
options->output_format |= DIFF_FORMAT_RAW;
else if (!strcmp(arg, "--patch-with-raw")) {
enable_patch_output(&options->output_format);
options->output_format |= DIFF_FORMAT_RAW;
} else if (!strcmp(arg, "--numstat"))
options->output_format |= DIFF_FORMAT_NUMSTAT;
else if (!strcmp(arg, "--shortstat"))
options->output_format |= DIFF_FORMAT_SHORTSTAT;
else if (skip_prefix(arg, "-X", &arg) ||
skip_to_optional_arg(arg, "--dirstat", &arg))
return parse_dirstat_opt(options, arg);
else if (!strcmp(arg, "--cumulative"))
return parse_dirstat_opt(options, "cumulative");
else if (skip_to_optional_arg(arg, "--dirstat-by-file", &arg)) {
parse_dirstat_opt(options, "files");
return parse_dirstat_opt(options, arg);
}
else if (!strcmp(arg, "--check"))
options->output_format |= DIFF_FORMAT_CHECKDIFF;
else if (!strcmp(arg, "--summary"))
options->output_format |= DIFF_FORMAT_SUMMARY;
else if (!strcmp(arg, "--patch-with-stat")) {
enable_patch_output(&options->output_format);
options->output_format |= DIFF_FORMAT_DIFFSTAT;
} else if (!strcmp(arg, "--name-only"))
options->output_format |= DIFF_FORMAT_NAME;
else if (!strcmp(arg, "--name-status"))
options->output_format |= DIFF_FORMAT_NAME_STATUS;
else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
options->output_format |= DIFF_FORMAT_NO_OUTPUT;
else if (starts_with(arg, "--stat"))
/* --stat, --stat-width, --stat-name-width, or --stat-count */
return stat_opt(options, av);
else if (!strcmp(arg, "--compact-summary")) {
options->flags.stat_with_summary = 1;
options->output_format |= DIFF_FORMAT_DIFFSTAT;
} else if (!strcmp(arg, "--no-compact-summary"))
options->flags.stat_with_summary = 0;
/* renames options */
else if (starts_with(arg, "-B") ||
skip_to_optional_arg(arg, "--break-rewrites", NULL)) {
if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
return error("invalid argument to -B: %s", arg+2);
}
else if (starts_with(arg, "-M") ||
skip_to_optional_arg(arg, "--find-renames", NULL)) {
if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
return error("invalid argument to -M: %s", arg+2);
options->detect_rename = DIFF_DETECT_RENAME;
}
else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
options->irreversible_delete = 1;
}
else if (starts_with(arg, "-C") ||
skip_to_optional_arg(arg, "--find-copies", NULL)) {
if (options->detect_rename == DIFF_DETECT_COPY)
options->flags.find_copies_harder = 1;
if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
return error("invalid argument to -C: %s", arg+2);
options->detect_rename = DIFF_DETECT_COPY;
}
else if (!strcmp(arg, "--no-renames"))
options->detect_rename = 0;
else if (!strcmp(arg, "--rename-empty"))
options->flags.rename_empty = 1;
else if (!strcmp(arg, "--no-rename-empty"))
options->flags.rename_empty = 0;
else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) {
options->flags.relative_name = 1;
if (arg)
options->prefix = arg;
}
/* xdiff options */
else if (!strcmp(arg, "--minimal"))
DIFF_XDL_SET(options, NEED_MINIMAL);
else if (!strcmp(arg, "--no-minimal"))
DIFF_XDL_CLR(options, NEED_MINIMAL);
else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
DIFF_XDL_SET(options, IGNORE_WHITESPACE);
else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
else if (!strcmp(arg, "--ignore-space-at-eol"))
DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
else if (!strcmp(arg, "--ignore-cr-at-eol"))
DIFF_XDL_SET(options, IGNORE_CR_AT_EOL);
else if (!strcmp(arg, "--ignore-blank-lines"))
DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
else if (!strcmp(arg, "--indent-heuristic"))
DIFF_XDL_SET(options, INDENT_HEURISTIC);
else if (!strcmp(arg, "--no-indent-heuristic"))
DIFF_XDL_CLR(options, INDENT_HEURISTIC);
else if (!strcmp(arg, "--patience")) {
int i;
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;
} else if (!strcmp(arg, "--histogram"))
options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
long value = parse_algorithm_value(optarg);
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 argcount;
} else if (skip_prefix(arg, "--anchored=", &arg)) {
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);
}
/* flags options */
else if (!strcmp(arg, "--binary")) {
enable_patch_output(&options->output_format);
options->flags.binary = 1;
}
else if (!strcmp(arg, "--full-index"))
options->flags.full_index = 1;
else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
options->flags.text = 1;
else if (!strcmp(arg, "-R"))
options->flags.reverse_diff = 1;
else if (!strcmp(arg, "--find-copies-harder"))
options->flags.find_copies_harder = 1;
else if (!strcmp(arg, "--follow"))
options->flags.follow_renames = 1;
else if (!strcmp(arg, "--no-follow")) {
options->flags.follow_renames = 0;
options->flags.default_follow_renames = 0;
} else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
int value = git_config_colorbool(NULL, arg);
if (value < 0)
return error("option `color' expects \"always\", \"auto\", or \"never\"");
options->use_color = value;
}
else if (!strcmp(arg, "--no-color"))
options->use_color = 0;
else if (!strcmp(arg, "--color-moved")) {
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 if (!strcmp(arg, "--no-color-moved"))
options->color_moved = COLOR_MOVED_NO;
else if (skip_prefix(arg, "--color-moved=", &arg)) {
int cm = parse_color_moved(arg);
if (cm < 0)
die("bad --color-moved argument: %s", arg);
options->color_moved = cm;
} else if (skip_prefix(arg, "--color-moved-ws=", &arg)) {
options->color_moved_ws_handling = parse_color_moved_ws(arg);
} else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
options->use_color = 1;
options->word_diff = DIFF_WORDS_COLOR;
}
else if (!strcmp(arg, "--word-diff")) {
if (options->word_diff == DIFF_WORDS_NONE)
options->word_diff = DIFF_WORDS_PLAIN;
}
else if (skip_prefix(arg, "--word-diff=", &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
die("bad --word-diff argument: %s", arg);
}
else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
if (options->word_diff == DIFF_WORDS_NONE)
options->word_diff = DIFF_WORDS_PLAIN;
options->word_regex = optarg;
return argcount;
}
else if (!strcmp(arg, "--exit-code"))
options->flags.exit_with_status = 1;
else if (!strcmp(arg, "--quiet"))
options->flags.quick = 1;
else if (!strcmp(arg, "--ext-diff"))
options->flags.allow_external = 1;
else if (!strcmp(arg, "--no-ext-diff"))
options->flags.allow_external = 0;
else if (!strcmp(arg, "--textconv")) {
options->flags.allow_textconv = 1;
options->flags.textconv_set_via_cmdline = 1;
} else if (!strcmp(arg, "--no-textconv"))
options->flags.allow_textconv = 0;
else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) {
options->flags.override_submodule_config = 1;
handle_ignore_submodules_arg(options, arg);
} else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
return parse_submodule_opt(options, arg);
else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
return parse_ws_error_highlight_opt(options, arg);
else if (!strcmp(arg, "--ita-invisible-in-index"))
options->ita_invisible_in_index = 1;
else if (!strcmp(arg, "--ita-visible-in-index"))
options->ita_invisible_in_index = 0;
/* misc options */
else if (!strcmp(arg, "-z"))
options->line_termination = 0;
else if ((argcount = short_opt('l', av, &optarg))) {
options->rename_limit = strtoul(optarg, NULL, 10);
return argcount;
}
else if ((argcount = short_opt('S', av, &optarg))) {
options->pickaxe = optarg;
options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
return argcount;
} else if ((argcount = short_opt('G', av, &optarg))) {
options->pickaxe = optarg;
options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
return argcount;
}
else if (!strcmp(arg, "--pickaxe-all"))
options->pickaxe_opts |= DIFF_PICKAXE_ALL;
else if (!strcmp(arg, "--pickaxe-regex"))
options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
else if ((argcount = short_opt('O', av, &optarg))) {
options->orderfile = prefix_filename(prefix, optarg);
return argcount;
} else if (skip_prefix(arg, "--find-object=", &arg))
return parse_objfind_opt(options, arg);
else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
int offending = parse_diff_filter_opt(optarg, options);
if (offending)
die("unknown change class '%c' in --diff-filter=%s",
offending, optarg);
return argcount;
}
else if (!strcmp(arg, "--no-abbrev"))
options->abbrev = 0;
else if (!strcmp(arg, "--abbrev"))
options->abbrev = DEFAULT_ABBREV;
else if (skip_prefix(arg, "--abbrev=", &arg)) {
options->abbrev = strtoul(arg, NULL, 10);
if (options->abbrev < MINIMUM_ABBREV)
options->abbrev = MINIMUM_ABBREV;
else if (the_hash_algo->hexsz < options->abbrev)
options->abbrev = the_hash_algo->hexsz;
}
else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
options->a_prefix = optarg;
return argcount;
}
else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
options->line_prefix = optarg;
options->line_prefix_length = strlen(options->line_prefix);
graph_setup_line_prefix(options);
return argcount;
}
else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
options->b_prefix = optarg;
return argcount;
}
else if (!strcmp(arg, "--no-prefix"))
options->a_prefix = options->b_prefix = "";
else if (opt_arg(arg, '\0', "inter-hunk-context",
&options->interhunkcontext))
;
else if (!strcmp(arg, "-W"))
options->flags.funccontext = 1;
else if (!strcmp(arg, "--function-context"))
options->flags.funccontext = 1;
else if (!strcmp(arg, "--no-function-context"))
options->flags.funccontext = 0;
else if ((argcount = parse_long_opt("output", av, &optarg))) {
char *path = prefix_filename(prefix, optarg);
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 argcount;
} else
return 0;
return 1;
}
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));
}
static int diff_scoreopt_parse(const char *opt)
{
int opt1, opt2, cmd;
if (*opt++ != '-')
return -1;
cmd = *opt++;
if (cmd == '-') {
/* convert the long-form arguments into short-form versions */
if (skip_prefix(opt, "break-rewrites", &opt)) {
if (*opt == 0 || *opt++ == '=')
cmd = 'B';
} else if (skip_prefix(opt, "find-copies", &opt)) {
if (*opt == 0 || *opt++ == '=')
cmd = 'C';
} else if (skip_prefix(opt, "find-renames", &opt)) {
if (*opt == 0 || *opt++ == '=')
cmd = 'M';
}
}
if (cmd != 'M' && cmd != 'C' && cmd != 'B')
return -1; /* that is not a -M, -C, or -B option */
opt1 = parse_rename_score(&opt);
if (cmd != 'B')
opt2 = 0;
else {
if (*opt == 0)
opt2 = 0;
else if (*opt != '/')
return -1; /* we expect -B80/99 or -B80 */
else {
opt++;
opt2 = parse_rename_score(&opt);
}
}
if (*opt != 0)
return -1;
return opt1 | (opt2 << 16);
}
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 &&
!oidcmp(&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 (oidcmp(&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_SHA_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;
}
static void patch_id_consume(void *priv, char *line, unsigned long len)
{
struct patch_id_t *data = priv;
int new_len;
/* Ignore line numbers when computing the SHA1 of the patch */
if (starts_with(line, "@@ -"))
return;
new_len = remove_space(line, len);
git_SHA1_Update(data->ctx, line, new_len);
data->patchlen += new_len;
}
static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
{
git_SHA1_Update(ctx, str, strlen(str));
}
static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
{
/* large enough for 2^32 in octal */
char buf[12];
int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
git_SHA1_Update(ctx, buf, len);
}
/* returns 0 upon success, and writes result into sha1 */
static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i;
git_SHA_CTX ctx;
struct patch_id_t data;
git_SHA1_Init(&ctx);
memset(&data, 0, sizeof(struct patch_id_t));
data.ctx = &ctx;
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);
diff_fill_oid_info(p->two);
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/");
git_SHA1_Update(&ctx, p->one->path, len1);
patch_id_add_string(&ctx, "b/");
git_SHA1_Update(&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/");
git_SHA1_Update(&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/");
git_SHA1_Update(&ctx, p->one->path, len1);
patch_id_add_string(&ctx, "+++/dev/null");
} else {
patch_id_add_string(&ctx, "---a/");
git_SHA1_Update(&ctx, p->one->path, len1);
patch_id_add_string(&ctx, "+++b/");
git_SHA1_Update(&ctx, p->two->path, len2);
}
if (diff_header_only)
continue;
if (fill_mmfile(&mf1, p->one) < 0 ||
fill_mmfile(&mf2, p->two) < 0)
return error("unable to read files to diff");
if (diff_filespec_is_binary(p->one) ||
diff_filespec_is_binary(p->two)) {
git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
GIT_SHA1_HEXSZ);
git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
GIT_SHA1_HEXSZ);
continue;
}
xpp.flags = 0;
xecfg.ctxlen = 3;
xecfg.flags = 0;
if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
&xpp, &xecfg))
return error("unable to generate patch-id diff for %s",
p->one->path);
}
git_SHA1_Final(oid->hash, &ctx);
return 0;
}
int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i;
int result = diff_get_patch_id(options, oid, diff_header_only);
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(&add_lines, 0);
hashmap_free(&del_lines, 0);
}
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;
}
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;
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);
}
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 diff_filespec *one,
struct diff_filespec *two)
{
if (S_ISGITLINK(one->mode))
return 0;
if (diff_populate_filespec(one, 0))
return 0;
if (diff_populate_filespec(two, 0))
return 0;
return !memcmp(one->data, two->data, one->size);
}
static int diff_filespec_check_stat_unmatch(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(p->one, CHECK_SIZE_ONLY) ||
diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
(p->one->size != p->two->size) ||
!diff_filespec_is_identical(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(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(struct diff_options *options)
{
struct diff_queue_struct *q = &diff_queued_diff;
QSORT(q->queue, q->nr, diffnamecmp);
}
void diffcore_std(struct diff_options *options)
{
/* 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->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 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(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(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(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 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(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(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(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(df);
if (!textconv) {
free_filespec(df);
return 0;
}
*buf_size = fill_textconv(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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