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git/diff.c
Junio C Hamano fb13227e08 git-diff: squelch "empty" diffs 
After starting to edit a working tree file but later when your edit ends
up identical to the original (this can also happen when you ran a
wholesale regexp replace with something like "perl -i" that does not
actually modify many of the paths), "git diff" between the index and the
working tree outputs many "empty" diffs that show "diff --git" headers
and nothing else, because these paths are stat-dirty.  While it was a
way to warn the user that the earlier action of the user made the index
ineffective as an optimization mechanism, it was felt too loud for the
purpose of warning even to experienced users, and also resulted in
confusing people new to git.

This replaces the "empty" diffs with a single warning message at the
end.  Having many such paths hurts performance, and you can run
"git-update-index --refresh" to update the lstat(2) information recorded
in the index in such a case.  "git-status" does so as a side effect, and
that is more familiar to the end-user, so we recommend it to them.

The change affects only "git diff" that outputs patch text, because that
is where the annoyance of too many "empty" diff is most strongly felt,
and because the warning message can be safely ignored by downstream
tools without getting mistaken as part of the patch.  For the low-level
"git diff-files" and "git diff-index", the traditional behaviour is
retained.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-08-14 01:55:00 -07:00

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/*
* Copyright (C) 2005 Junio C Hamano
*/
#include "cache.h"
#include "quote.h"
#include "diff.h"
#include "diffcore.h"
#include "delta.h"
#include "xdiff-interface.h"
#include "color.h"
#include "attr.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_rename_limit_default = -1;
static int diff_use_color_default;
static char diff_colors[][COLOR_MAXLEN] = {
"\033[m", /* reset */
"", /* PLAIN (normal) */
"\033[1m", /* METAINFO (bold) */
"\033[36m", /* FRAGINFO (cyan) */
"\033[31m", /* OLD (red) */
"\033[32m", /* NEW (green) */
"\033[33m", /* COMMIT (yellow) */
"\033[41m", /* WHITESPACE (red background) */
};
static int parse_diff_color_slot(const char *var, int ofs)
{
if (!strcasecmp(var+ofs, "plain"))
return DIFF_PLAIN;
if (!strcasecmp(var+ofs, "meta"))
return DIFF_METAINFO;
if (!strcasecmp(var+ofs, "frag"))
return DIFF_FRAGINFO;
if (!strcasecmp(var+ofs, "old"))
return DIFF_FILE_OLD;
if (!strcasecmp(var+ofs, "new"))
return DIFF_FILE_NEW;
if (!strcasecmp(var+ofs, "commit"))
return DIFF_COMMIT;
if (!strcasecmp(var+ofs, "whitespace"))
return DIFF_WHITESPACE;
die("bad config variable '%s'", var);
}
static struct ll_diff_driver {
const char *name;
struct ll_diff_driver *next;
char *cmd;
} *user_diff, **user_diff_tail;
static void read_config_if_needed(void)
{
if (!user_diff_tail) {
user_diff_tail = &user_diff;
git_config(git_diff_ui_config);
}
}
/*
* Currently there is only "diff.<drivername>.command" variable;
* because there are "diff.color.<slot>" variables, we are parsing
* this in a bit convoluted way to allow low level diff driver
* called "color".
*/
static int parse_lldiff_command(const char *var, const char *ep, const char *value)
{
const char *name;
int namelen;
struct ll_diff_driver *drv;
name = var + 5;
namelen = ep - name;
for (drv = user_diff; drv; drv = drv->next)
if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
break;
if (!drv) {
char *namebuf;
drv = xcalloc(1, sizeof(struct ll_diff_driver));
namebuf = xmalloc(namelen + 1);
memcpy(namebuf, name, namelen);
namebuf[namelen] = 0;
drv->name = namebuf;
drv->next = NULL;
if (!user_diff_tail)
user_diff_tail = &user_diff;
*user_diff_tail = drv;
user_diff_tail = &(drv->next);
}
if (!value)
return error("%s: lacks value", var);
drv->cmd = strdup(value);
return 0;
}
/*
* 'diff.<what>.funcname' attribute can be specified in the configuration
* to define a customized regexp to find the beginning of a function to
* be used for hunk header lines of "diff -p" style output.
*/
static struct funcname_pattern {
char *name;
char *pattern;
struct funcname_pattern *next;
} *funcname_pattern_list;
static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
{
const char *name;
int namelen;
struct funcname_pattern *pp;
name = var + 5; /* "diff." */
namelen = ep - name;
for (pp = funcname_pattern_list; pp; pp = pp->next)
if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
break;
if (!pp) {
char *namebuf;
pp = xcalloc(1, sizeof(*pp));
namebuf = xmalloc(namelen + 1);
memcpy(namebuf, name, namelen);
namebuf[namelen] = 0;
pp->name = namebuf;
pp->next = funcname_pattern_list;
funcname_pattern_list = pp;
}
if (pp->pattern)
free(pp->pattern);
pp->pattern = xstrdup(value);
return 0;
}
/*
* 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.
*/
int git_diff_ui_config(const char *var, const char *value)
{
if (!strcmp(var, "diff.renamelimit")) {
diff_rename_limit_default = git_config_int(var, value);
return 0;
}
if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
diff_use_color_default = git_config_colorbool(var, value);
return 0;
}
if (!strcmp(var, "diff.renames")) {
if (!value)
diff_detect_rename_default = DIFF_DETECT_RENAME;
else if (!strcasecmp(value, "copies") ||
!strcasecmp(value, "copy"))
diff_detect_rename_default = DIFF_DETECT_COPY;
else if (git_config_bool(var,value))
diff_detect_rename_default = DIFF_DETECT_RENAME;
return 0;
}
if (!prefixcmp(var, "diff.")) {
const char *ep = strrchr(var, '.');
if (ep != var + 4) {
if (!strcmp(ep, ".command"))
return parse_lldiff_command(var, ep, value);
if (!strcmp(ep, ".funcname"))
return parse_funcname_pattern(var, ep, value);
}
}
if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
int slot = parse_diff_color_slot(var, 11);
color_parse(value, var, diff_colors[slot]);
return 0;
}
return git_default_config(var, value);
}
static char *quote_one(const char *str)
{
int needlen;
char *xp;
if (!str)
return NULL;
needlen = quote_c_style(str, NULL, NULL, 0);
if (!needlen)
return xstrdup(str);
xp = xmalloc(needlen + 1);
quote_c_style(str, xp, NULL, 0);
return xp;
}
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);
char *xp;
if (need_one + need_two) {
if (!need_one) need_one = strlen(one);
if (!need_two) need_one = strlen(two);
xp = xmalloc(need_one + need_two + 3);
xp[0] = '"';
quote_c_style(one, xp + 1, NULL, 1);
quote_c_style(two, xp + need_one + 1, NULL, 1);
strcpy(xp + need_one + need_two + 1, "\"");
return xp;
}
need_one = strlen(one);
need_two = strlen(two);
xp = xmalloc(need_one + need_two + 1);
strcpy(xp, one);
strcpy(xp + need_one, two);
return xp;
}
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");
done_preparing = 1;
return external_diff_cmd;
}
static struct diff_tempfile {
const char *name; /* filename external diff should read from */
char hex[41];
char mode[10];
char tmp_path[PATH_MAX];
} diff_temp[2];
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 void print_line_count(int count)
{
switch (count) {
case 0:
printf("0,0");
break;
case 1:
printf("1");
break;
default:
printf("1,%d", count);
break;
}
}
static void copy_file(int prefix, const char *data, int size,
const char *set, const char *reset)
{
int ch, nl_just_seen = 1;
while (0 < size--) {
ch = *data++;
if (nl_just_seen) {
fputs(set, stdout);
putchar(prefix);
}
if (ch == '\n') {
nl_just_seen = 1;
fputs(reset, stdout);
} else
nl_just_seen = 0;
putchar(ch);
}
if (!nl_just_seen)
printf("%s\n\\ No newline at end of file\n", reset);
}
static void emit_rewrite_diff(const char *name_a,
const char *name_b,
struct diff_filespec *one,
struct diff_filespec *two,
int color_diff)
{
int lc_a, lc_b;
const char *name_a_tab, *name_b_tab;
const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
const char *reset = diff_get_color(color_diff, DIFF_RESET);
name_a += (*name_a == '/');
name_b += (*name_b == '/');
name_a_tab = strchr(name_a, ' ') ? "\t" : "";
name_b_tab = strchr(name_b, ' ') ? "\t" : "";
diff_populate_filespec(one, 0);
diff_populate_filespec(two, 0);
lc_a = count_lines(one->data, one->size);
lc_b = count_lines(two->data, two->size);
printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
metainfo, name_a, name_a_tab, reset,
metainfo, name_b, name_b_tab, reset, fraginfo);
print_line_count(lc_a);
printf(" +");
print_line_count(lc_b);
printf(" @@%s\n", reset);
if (lc_a)
copy_file('-', one->data, one->size, old, reset);
if (lc_b)
copy_file('+', two->data, two->size, new, reset);
}
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;
}
struct diff_words_buffer {
mmfile_t text;
long alloc;
long current; /* output pointer */
int suppressed_newline;
};
static void diff_words_append(char *line, unsigned long len,
struct diff_words_buffer *buffer)
{
if (buffer->text.size + len > buffer->alloc) {
buffer->alloc = (buffer->text.size + len) * 3 / 2;
buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
}
line++;
len--;
memcpy(buffer->text.ptr + buffer->text.size, line, len);
buffer->text.size += len;
}
struct diff_words_data {
struct xdiff_emit_state xm;
struct diff_words_buffer minus, plus;
};
static void print_word(struct diff_words_buffer *buffer, int len, int color,
int suppress_newline)
{
const char *ptr;
int eol = 0;
if (len == 0)
return;
ptr = buffer->text.ptr + buffer->current;
buffer->current += len;
if (ptr[len - 1] == '\n') {
eol = 1;
len--;
}
fputs(diff_get_color(1, color), stdout);
fwrite(ptr, len, 1, stdout);
fputs(diff_get_color(1, DIFF_RESET), stdout);
if (eol) {
if (suppress_newline)
buffer->suppressed_newline = 1;
else
putchar('\n');
}
}
static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
{
struct diff_words_data *diff_words = priv;
if (diff_words->minus.suppressed_newline) {
if (line[0] != '+')
putchar('\n');
diff_words->minus.suppressed_newline = 0;
}
len--;
switch (line[0]) {
case '-':
print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
break;
case '+':
print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
break;
case ' ':
print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
diff_words->minus.current += len;
break;
}
}
/* 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;
xdemitcb_t ecb;
mmfile_t minus, plus;
int i;
memset(&xecfg, 0, sizeof(xecfg));
minus.size = diff_words->minus.text.size;
minus.ptr = xmalloc(minus.size);
memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
for (i = 0; i < minus.size; i++)
if (isspace(minus.ptr[i]))
minus.ptr[i] = '\n';
diff_words->minus.current = 0;
plus.size = diff_words->plus.text.size;
plus.ptr = xmalloc(plus.size);
memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
for (i = 0; i < plus.size; i++)
if (isspace(plus.ptr[i]))
plus.ptr[i] = '\n';
diff_words->plus.current = 0;
xpp.flags = XDF_NEED_MINIMAL;
xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
ecb.outf = xdiff_outf;
ecb.priv = diff_words;
diff_words->xm.consume = fn_out_diff_words_aux;
xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
free(minus.ptr);
free(plus.ptr);
diff_words->minus.text.size = diff_words->plus.text.size = 0;
if (diff_words->minus.suppressed_newline) {
putchar('\n');
diff_words->minus.suppressed_newline = 0;
}
}
struct emit_callback {
struct xdiff_emit_state xm;
int nparents, color_diff;
const char **label_path;
struct diff_words_data *diff_words;
int *found_changesp;
};
static void free_diff_words_data(struct emit_callback *ecbdata)
{
if (ecbdata->diff_words) {
/* flush buffers */
if (ecbdata->diff_words->minus.text.size ||
ecbdata->diff_words->plus.text.size)
diff_words_show(ecbdata->diff_words);
if (ecbdata->diff_words->minus.text.ptr)
free (ecbdata->diff_words->minus.text.ptr);
if (ecbdata->diff_words->plus.text.ptr)
free (ecbdata->diff_words->plus.text.ptr);
free(ecbdata->diff_words);
ecbdata->diff_words = NULL;
}
}
const char *diff_get_color(int diff_use_color, enum color_diff ix)
{
if (diff_use_color)
return diff_colors[ix];
return "";
}
static void emit_line(const char *set, const char *reset, const char *line, int len)
{
if (len > 0 && line[len-1] == '\n')
len--;
fputs(set, stdout);
fwrite(line, len, 1, stdout);
puts(reset);
}
static void emit_line_with_ws(int nparents,
const char *set, const char *reset, const char *ws,
const char *line, int len)
{
int col0 = nparents;
int last_tab_in_indent = -1;
int last_space_in_indent = -1;
int i;
int tail = len;
int need_highlight_leading_space = 0;
/* The line is a newly added line. Does it have funny leading
* whitespaces? In indent, SP should never precede a TAB.
*/
for (i = col0; i < len; i++) {
if (line[i] == '\t') {
last_tab_in_indent = i;
if (0 <= last_space_in_indent)
need_highlight_leading_space = 1;
}
else if (line[i] == ' ')
last_space_in_indent = i;
else
break;
}
fputs(set, stdout);
fwrite(line, col0, 1, stdout);
fputs(reset, stdout);
if (((i == len) || line[i] == '\n') && i != col0) {
/* The whole line was indent */
emit_line(ws, reset, line + col0, len - col0);
return;
}
i = col0;
if (need_highlight_leading_space) {
while (i < last_tab_in_indent) {
if (line[i] == ' ') {
fputs(ws, stdout);
putchar(' ');
fputs(reset, stdout);
}
else
putchar(line[i]);
i++;
}
}
tail = len - 1;
if (line[tail] == '\n' && i < tail)
tail--;
while (i < tail) {
if (!isspace(line[tail]))
break;
tail--;
}
if ((i < tail && line[tail + 1] != '\n')) {
/* This has whitespace between tail+1..len */
fputs(set, stdout);
fwrite(line + i, tail - i + 1, 1, stdout);
fputs(reset, stdout);
emit_line(ws, reset, line + tail + 1, len - tail - 1);
}
else
emit_line(set, reset, line + i, len - i);
}
static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
{
const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
if (!*ws)
emit_line(set, reset, line, len);
else
emit_line_with_ws(ecbdata->nparents, set, reset, ws,
line, len);
}
static void fn_out_consume(void *priv, char *line, unsigned long len)
{
int i;
int color;
struct emit_callback *ecbdata = priv;
const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
*(ecbdata->found_changesp) = 1;
if (ecbdata->label_path[0]) {
const char *name_a_tab, *name_b_tab;
name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
printf("%s--- %s%s%s\n",
set, ecbdata->label_path[0], reset, name_a_tab);
printf("%s+++ %s%s%s\n",
set, ecbdata->label_path[1], reset, name_b_tab);
ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
}
/* This is not really necessary for now because
* this codepath only deals with two-way diffs.
*/
for (i = 0; i < len && line[i] == '@'; i++)
;
if (2 <= i && i < len && line[i] == ' ') {
ecbdata->nparents = i - 1;
emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
reset, line, len);
return;
}
if (len < ecbdata->nparents) {
set = reset;
emit_line(reset, reset, line, len);
return;
}
color = DIFF_PLAIN;
if (ecbdata->diff_words && ecbdata->nparents != 1)
/* fall back to normal diff */
free_diff_words_data(ecbdata);
if (ecbdata->diff_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;
}
if (ecbdata->diff_words->minus.text.size ||
ecbdata->diff_words->plus.text.size)
diff_words_show(ecbdata->diff_words);
line++;
len--;
emit_line(set, reset, line, len);
return;
}
for (i = 0; i < ecbdata->nparents && len; i++) {
if (line[i] == '-')
color = DIFF_FILE_OLD;
else if (line[i] == '+')
color = DIFF_FILE_NEW;
}
if (color != DIFF_FILE_NEW) {
emit_line(diff_get_color(ecbdata->color_diff, color),
reset, line, len);
return;
}
emit_add_line(reset, ecbdata, line, len);
}
static char *pprint_rename(const char *a, const char *b)
{
const char *old = a;
const char *new = b;
char *name = NULL;
int pfx_length, sfx_length;
int len_a = strlen(a);
int len_b = strlen(b);
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) {
if (qlen_a) len_a = qlen_a;
if (qlen_b) len_b = qlen_b;
name = xmalloc( len_a + len_b + 5 );
if (qlen_a)
quote_c_style(a, name, NULL, 0);
else
memcpy(name, a, len_a);
memcpy(name + len_a, " => ", 4);
if (qlen_b)
quote_c_style(b, name + len_a + 4, NULL, 0);
else
memcpy(name + len_a + 4, b, len_b + 1);
return name;
}
/* Find common prefix */
pfx_length = 0;
while (*old && *new && *old == *new) {
if (*old == '/')
pfx_length = old - a + 1;
old++;
new++;
}
/* Find common suffix */
old = a + len_a;
new = b + len_b;
sfx_length = 0;
while (a <= old && b <= new && *old == *new) {
if (*old == '/')
sfx_length = len_a - (old - a);
old--;
new--;
}
/*
* pfx{mid-a => mid-b}sfx
* {pfx-a => pfx-b}sfx
* pfx{sfx-a => sfx-b}
* name-a => name-b
*/
if (pfx_length + sfx_length) {
int a_midlen = len_a - pfx_length - sfx_length;
int b_midlen = len_b - pfx_length - sfx_length;
if (a_midlen < 0) a_midlen = 0;
if (b_midlen < 0) b_midlen = 0;
name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
sprintf(name, "%.*s{%.*s => %.*s}%s",
pfx_length, a,
a_midlen, a + pfx_length,
b_midlen, b + pfx_length,
a + len_a - sfx_length);
}
else {
name = xmalloc(len_a + len_b + 5);
sprintf(name, "%s => %s", a, b);
}
return name;
}
struct diffstat_t {
struct xdiff_emit_state xm;
int nr;
int alloc;
struct diffstat_file {
char *name;
unsigned is_unmerged:1;
unsigned is_binary:1;
unsigned is_renamed:1;
unsigned int 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(sizeof (*x), 1);
if (diffstat->nr == diffstat->alloc) {
diffstat->alloc = alloc_nr(diffstat->alloc);
diffstat->files = xrealloc(diffstat->files,
diffstat->alloc * sizeof(x));
}
diffstat->files[diffstat->nr++] = x;
if (name_b) {
x->name = pprint_rename(name_a, name_b);
x->is_renamed = 1;
}
else
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)
{
/*
* make sure that at least one '-' is printed if there were deletions,
* and likewise for '+'.
*/
if (max_change < 2)
return it;
return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
}
static void show_name(const char *prefix, const char *name, int len,
const char *reset, const char *set)
{
printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
}
static void show_graph(char ch, int cnt, const char *set, const char *reset)
{
if (cnt <= 0)
return;
printf("%s", set);
while (cnt--)
putchar(ch);
printf("%s", reset);
}
static void show_stats(struct diffstat_t* data, struct diff_options *options)
{
int i, len, add, del, total, adds = 0, dels = 0;
int max_change = 0, max_len = 0;
int total_files = data->nr;
int width, name_width;
const char *reset, *set, *add_c, *del_c;
if (data->nr == 0)
return;
width = options->stat_width ? options->stat_width : 80;
name_width = options->stat_name_width ? options->stat_name_width : 50;
/* Sanity: give at least 5 columns to the graph,
* but leave at least 10 columns for the name.
*/
if (width < name_width + 15) {
if (name_width <= 25)
width = name_width + 15;
else
name_width = width - 15;
}
/* Find the longest filename and max number of changes */
reset = diff_get_color(options->color_diff, DIFF_RESET);
set = diff_get_color(options->color_diff, DIFF_PLAIN);
add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
for (i = 0; i < data->nr; i++) {
struct diffstat_file *file = data->files[i];
int change = file->added + file->deleted;
if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
len = quote_c_style(file->name, NULL, NULL, 0);
if (len) {
char *qname = xmalloc(len + 1);
quote_c_style(file->name, qname, NULL, 0);
free(file->name);
file->name = qname;
}
}
len = strlen(file->name);
if (max_len < len)
max_len = len;
if (file->is_binary || file->is_unmerged)
continue;
if (max_change < change)
max_change = change;
}
/* Compute the width of the graph part;
* 10 is for one blank at the beginning of the line plus
* " | count " between the name and the graph.
*
* From here on, name_width is the width of the name area,
* and width is the width of the graph area.
*/
name_width = (name_width < max_len) ? name_width : max_len;
if (width < (name_width + 10) + max_change)
width = width - (name_width + 10);
else
width = max_change;
for (i = 0; i < data->nr; i++) {
const char *prefix = "";
char *name = data->files[i]->name;
int added = data->files[i]->added;
int deleted = data->files[i]->deleted;
int name_len;
/*
* "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 (data->files[i]->is_binary) {
show_name(prefix, name, len, reset, set);
printf(" Bin ");
printf("%s%d%s", del_c, deleted, reset);
printf(" -> ");
printf("%s%d%s", add_c, added, reset);
printf(" bytes");
printf("\n");
goto free_diffstat_file;
}
else if (data->files[i]->is_unmerged) {
show_name(prefix, name, len, reset, set);
printf(" Unmerged\n");
goto free_diffstat_file;
}
else if (!data->files[i]->is_renamed &&
(added + deleted == 0)) {
total_files--;
goto free_diffstat_file;
}
/*
* scale the add/delete
*/
add = added;
del = deleted;
total = add + del;
adds += add;
dels += del;
if (width <= max_change) {
add = scale_linear(add, width, max_change);
del = scale_linear(del, width, max_change);
total = add + del;
}
show_name(prefix, name, len, reset, set);
printf("%5d ", added + deleted);
show_graph('+', add, add_c, reset);
show_graph('-', del, del_c, reset);
putchar('\n');
free_diffstat_file:
free(data->files[i]->name);
free(data->files[i]);
}
free(data->files);
printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
set, total_files, adds, dels, reset);
}
static void show_shortstats(struct diffstat_t* data)
{
int i, adds = 0, dels = 0, total_files = data->nr;
if (data->nr == 0)
return;
for (i = 0; i < data->nr; i++) {
if (!data->files[i]->is_binary &&
!data->files[i]->is_unmerged) {
int added = data->files[i]->added;
int deleted= data->files[i]->deleted;
if (!data->files[i]->is_renamed &&
(added + deleted == 0)) {
total_files--;
} else {
adds += added;
dels += deleted;
}
}
free(data->files[i]->name);
free(data->files[i]);
}
free(data->files);
printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
total_files, adds, dels);
}
static void show_numstat(struct diffstat_t* data, struct diff_options *options)
{
int i;
for (i = 0; i < data->nr; i++) {
struct diffstat_file *file = data->files[i];
if (file->is_binary)
printf("-\t-\t");
else
printf("%d\t%d\t", file->added, file->deleted);
if (options->line_termination && !file->is_renamed &&
quote_c_style(file->name, NULL, NULL, 0))
quote_c_style(file->name, NULL, stdout, 0);
else
fputs(file->name, stdout);
putchar(options->line_termination);
}
}
struct checkdiff_t {
struct xdiff_emit_state xm;
const char *filename;
int lineno, color_diff;
};
static void checkdiff_consume(void *priv, char *line, unsigned long len)
{
struct checkdiff_t *data = priv;
const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
if (line[0] == '+') {
int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
/* check space before tab */
for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
if (line[i] == ' ')
spaces++;
if (line[i - 1] == '\t' && spaces)
space_before_tab = 1;
/* check white space at line end */
if (line[len - 1] == '\n')
len--;
if (isspace(line[len - 1]))
white_space_at_end = 1;
if (space_before_tab || white_space_at_end) {
printf("%s:%d: %s", data->filename, data->lineno, ws);
if (space_before_tab) {
printf("space before tab");
if (white_space_at_end)
putchar(',');
}
if (white_space_at_end)
printf("white space at end");
printf(":%s ", reset);
emit_line_with_ws(1, set, reset, ws, line, len);
}
data->lineno++;
} else if (line[0] == ' ')
data->lineno++;
else if (line[0] == '@') {
char *plus = strchr(line, '+');
if (plus)
data->lineno = strtol(plus, NULL, 10);
else
die("invalid diff");
}
}
static unsigned char *deflate_it(char *data,
unsigned long size,
unsigned long *result_size)
{
int bound;
unsigned char *deflated;
z_stream stream;
memset(&stream, 0, sizeof(stream));
deflateInit(&stream, zlib_compression_level);
bound = deflateBound(&stream, size);
deflated = xmalloc(bound);
stream.next_out = deflated;
stream.avail_out = bound;
stream.next_in = (unsigned char *)data;
stream.avail_in = size;
while (deflate(&stream, Z_FINISH) == Z_OK)
; /* nothing */
deflateEnd(&stream);
*result_size = stream.total_out;
return deflated;
}
static void emit_binary_diff_body(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) {
printf("delta %lu\n", orig_size);
free(deflated);
data = delta;
data_size = delta_size;
}
else {
printf("literal %lu\n", two->size);
free(delta);
data = deflated;
data_size = deflate_size;
}
/* emit data encoded in base85 */
cp = data;
while (data_size) {
int bytes = (52 < data_size) ? 52 : data_size;
char line[70];
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;
puts(line);
}
printf("\n");
free(data);
}
static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
{
printf("GIT binary patch\n");
emit_binary_diff_body(one, two);
emit_binary_diff_body(two, one);
}
static void setup_diff_attr_check(struct git_attr_check *check)
{
static struct git_attr *attr_diff;
if (!attr_diff) {
attr_diff = git_attr("diff", 4);
}
check[0].attr = attr_diff;
}
static void diff_filespec_check_attr(struct diff_filespec *one)
{
struct git_attr_check attr_diff_check;
int check_from_data = 0;
if (one->checked_attr)
return;
setup_diff_attr_check(&attr_diff_check);
one->is_binary = 0;
one->funcname_pattern_ident = NULL;
if (!git_checkattr(one->path, 1, &attr_diff_check)) {
const char *value;
/* binaryness */
value = attr_diff_check.value;
if (ATTR_TRUE(value))
;
else if (ATTR_FALSE(value))
one->is_binary = 1;
else
check_from_data = 1;
/* funcname pattern ident */
if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
;
else
one->funcname_pattern_ident = value;
}
if (check_from_data) {
if (!one->data && DIFF_FILE_VALID(one))
diff_populate_filespec(one, 0);
if (one->data)
one->is_binary = buffer_is_binary(one->data, one->size);
}
}
int diff_filespec_is_binary(struct diff_filespec *one)
{
diff_filespec_check_attr(one);
return one->is_binary;
}
static const char *funcname_pattern(const char *ident)
{
struct funcname_pattern *pp;
read_config_if_needed();
for (pp = funcname_pattern_list; pp; pp = pp->next)
if (!strcmp(ident, pp->name))
return pp->pattern;
return NULL;
}
static struct builtin_funcname_pattern {
const char *name;
const char *pattern;
} builtin_funcname_pattern[] = {
{ "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
"new\\|return\\|switch\\|throw\\|while\\)\n"
"^[ ]*\\(\\([ ]*"
"[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
"[ ]*([^;]*$\\)" },
{ "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
};
static const char *diff_funcname_pattern(struct diff_filespec *one)
{
const char *ident, *pattern;
int i;
diff_filespec_check_attr(one);
ident = one->funcname_pattern_ident;
if (!ident)
/*
* If the config file has "funcname.default" defined, that
* regexp is used; otherwise NULL is returned and xemit uses
* the built-in default.
*/
return funcname_pattern("default");
/* Look up custom "funcname.$ident" regexp from config. */
pattern = funcname_pattern(ident);
if (pattern)
return pattern;
/*
* And define built-in fallback patterns here. Note that
* these can be overriden by the user's config settings.
*/
for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
if (!strcmp(ident, builtin_funcname_pattern[i].name))
return builtin_funcname_pattern[i].pattern;
return NULL;
}
static void builtin_diff(const char *name_a,
const char *name_b,
struct diff_filespec *one,
struct diff_filespec *two,
const char *xfrm_msg,
struct diff_options *o,
int complete_rewrite)
{
mmfile_t mf1, mf2;
const char *lbl[2];
char *a_one, *b_two;
const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
a_one = quote_two("a/", name_a + (*name_a == '/'));
b_two = quote_two("b/", name_b + (*name_b == '/'));
lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
if (lbl[0][0] == '/') {
/* /dev/null */
printf("%snew file mode %06o%s\n", set, two->mode, reset);
if (xfrm_msg && xfrm_msg[0])
printf("%s%s%s\n", set, xfrm_msg, reset);
}
else if (lbl[1][0] == '/') {
printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
if (xfrm_msg && xfrm_msg[0])
printf("%s%s%s\n", set, xfrm_msg, reset);
}
else {
if (one->mode != two->mode) {
printf("%sold mode %06o%s\n", set, one->mode, reset);
printf("%snew mode %06o%s\n", set, two->mode, reset);
}
if (xfrm_msg && xfrm_msg[0])
printf("%s%s%s\n", set, xfrm_msg, reset);
/*
* 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) {
emit_rewrite_diff(name_a, name_b, one, two,
o->color_diff);
o->found_changes = 1;
goto free_ab_and_return;
}
}
if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
die("unable to read files to diff");
if (!o->text &&
(diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
/* Quite common confusing case */
if (mf1.size == mf2.size &&
!memcmp(mf1.ptr, mf2.ptr, mf1.size))
goto free_ab_and_return;
if (o->binary)
emit_binary_diff(&mf1, &mf2);
else
printf("Binary files %s and %s differ\n",
lbl[0], lbl[1]);
o->found_changes = 1;
}
else {
/* Crazy xdl interfaces.. */
const char *diffopts = getenv("GIT_DIFF_OPTS");
xpparam_t xpp;
xdemitconf_t xecfg;
xdemitcb_t ecb;
struct emit_callback ecbdata;
const char *funcname_pattern;
funcname_pattern = diff_funcname_pattern(one);
if (!funcname_pattern)
funcname_pattern = diff_funcname_pattern(two);
memset(&xecfg, 0, sizeof(xecfg));
memset(&ecbdata, 0, sizeof(ecbdata));
ecbdata.label_path = lbl;
ecbdata.color_diff = o->color_diff;
ecbdata.found_changesp = &o->found_changes;
xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
xecfg.ctxlen = o->context;
xecfg.flags = XDL_EMIT_FUNCNAMES;
if (funcname_pattern)
xdiff_set_find_func(&xecfg, funcname_pattern);
if (!diffopts)
;
else if (!prefixcmp(diffopts, "--unified="))
xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
else if (!prefixcmp(diffopts, "-u"))
xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
ecb.outf = xdiff_outf;
ecb.priv = &ecbdata;
ecbdata.xm.consume = fn_out_consume;
if (o->color_diff_words)
ecbdata.diff_words =
xcalloc(1, sizeof(struct diff_words_data));
xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
if (o->color_diff_words)
free_diff_words_data(&ecbdata);
}
free_ab_and_return:
diff_free_filespec_data(one);
diff_free_filespec_data(two);
free(a_one);
free(b_two);
return;
}
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,
int complete_rewrite)
{
mmfile_t mf1, mf2;
struct diffstat_file *data;
data = diffstat_add(diffstat, name_a, name_b);
if (!one || !two) {
data->is_unmerged = 1;
return;
}
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);
goto free_and_return;
}
if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
die("unable to read files to diff");
if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
data->is_binary = 1;
data->added = mf2.size;
data->deleted = mf1.size;
} else {
/* Crazy xdl interfaces.. */
xpparam_t xpp;
xdemitconf_t xecfg;
xdemitcb_t ecb;
memset(&xecfg, 0, sizeof(xecfg));
xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
ecb.outf = xdiff_outf;
ecb.priv = diffstat;
xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
}
free_and_return:
diff_free_filespec_data(one);
diff_free_filespec_data(two);
}
static void builtin_checkdiff(const char *name_a, const char *name_b,
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.xm.consume = checkdiff_consume;
data.filename = name_b ? name_b : name_a;
data.lineno = 0;
data.color_diff = o->color_diff;
if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
die("unable to read files to diff");
if (diff_filespec_is_binary(two))
goto free_and_return;
else {
/* Crazy xdl interfaces.. */
xpparam_t xpp;
xdemitconf_t xecfg;
xdemitcb_t ecb;
memset(&xecfg, 0, sizeof(xecfg));
xpp.flags = XDF_NEED_MINIMAL;
ecb.outf = xdiff_outf;
ecb.priv = &data;
xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
}
free_and_return:
diff_free_filespec_data(one);
diff_free_filespec_data(two);
}
struct diff_filespec *alloc_filespec(const char *path)
{
int namelen = strlen(path);
struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
memset(spec, 0, sizeof(*spec));
spec->path = (char *)(spec + 1);
memcpy(spec->path, path, namelen+1);
return spec;
}
void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
unsigned short mode)
{
if (mode) {
spec->mode = canon_mode(mode);
hashcpy(spec->sha1, sha1);
spec->sha1_valid = !is_null_sha1(sha1);
}
}
/*
* 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 unsigned char *sha1, int want_file)
{
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_sha1_pack(sha1, NULL))
return 0;
len = strlen(name);
pos = cache_name_pos(name, len);
if (pos < 0)
return 0;
ce = active_cache[pos];
if ((lstat(name, &st) < 0) ||
!S_ISREG(st.st_mode) || /* careful! */
ce_match_stat(ce, &st, 0) ||
hashcmp(sha1, ce->sha1))
return 0;
/* we return 1 only when we can stat, it is a regular file,
* stat information matches, and sha1 recorded in the cache
* matches. I.e. we know the file in the work tree really is
* the same as the <name, sha1> pair.
*/
return 1;
}
static int populate_from_stdin(struct diff_filespec *s)
{
#define INCREMENT 1024
char *buf;
unsigned long size;
ssize_t got;
size = 0;
buf = NULL;
while (1) {
buf = xrealloc(buf, size + INCREMENT);
got = xread(0, buf + size, INCREMENT);
if (!got)
break; /* EOF */
if (got < 0)
return error("error while reading from stdin %s",
strerror(errno));
size += got;
}
s->should_munmap = 0;
s->data = buf;
s->size = size;
s->should_free = 1;
return 0;
}
static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
{
int len;
char *data = xmalloc(100);
len = snprintf(data, 100,
"Subproject commit %s\n", sha1_to_hex(s->sha1));
s->data = data;
s->size = len;
s->should_free = 1;
if (size_only) {
s->data = NULL;
free(data);
}
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, int size_only)
{
int err = 0;
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->sha1_valid ||
reuse_worktree_file(s->path, s->sha1, 0)) {
struct stat st;
int fd;
char *buf;
unsigned long size;
if (!strcmp(s->path, "-"))
return populate_from_stdin(s);
if (lstat(s->path, &st) < 0) {
if (errno == ENOENT) {
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 (size_only)
return 0;
if (S_ISLNK(st.st_mode)) {
int ret;
s->data = xmalloc(s->size);
s->should_free = 1;
ret = readlink(s->path, s->data, s->size);
if (ret < 0) {
free(s->data);
goto err_empty;
}
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
*/
size = s->size;
buf = convert_to_git(s->path, s->data, &size);
if (buf) {
munmap(s->data, s->size);
s->should_munmap = 0;
s->data = buf;
s->size = size;
s->should_free = 1;
}
}
else {
enum object_type type;
if (size_only)
type = sha1_object_info(s->sha1, &s->size);
else {
s->data = read_sha1_file(s->sha1, &type, &s->size);
s->should_free = 1;
}
}
return 0;
}
void diff_free_filespec_data(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;
}
free(s->cnt_data);
s->cnt_data = NULL;
}
static void prep_temp_blob(struct diff_tempfile *temp,
void *blob,
unsigned long size,
const unsigned char *sha1,
int mode)
{
int fd;
fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
if (fd < 0)
die("unable to create temp-file: %s", strerror(errno));
if (write_in_full(fd, blob, size) != size)
die("unable to write temp-file");
close(fd);
temp->name = temp->tmp_path;
strcpy(temp->hex, sha1_to_hex(sha1));
temp->hex[40] = 0;
sprintf(temp->mode, "%06o", mode);
}
static void prepare_temp_file(const char *name,
struct diff_tempfile *temp,
struct diff_filespec *one)
{
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";
strcpy(temp->hex, ".");
strcpy(temp->mode, ".");
return;
}
if (!one->sha1_valid ||
reuse_worktree_file(name, one->sha1, 1)) {
struct stat st;
if (lstat(name, &st) < 0) {
if (errno == ENOENT)
goto not_a_valid_file;
die("stat(%s): %s", name, strerror(errno));
}
if (S_ISLNK(st.st_mode)) {
int ret;
char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
size_t sz = xsize_t(st.st_size);
if (sizeof(buf) <= st.st_size)
die("symlink too long: %s", name);
ret = readlink(name, buf, sz);
if (ret < 0)
die("readlink(%s)", name);
prep_temp_blob(temp, buf, sz,
(one->sha1_valid ?
one->sha1 : null_sha1),
(one->sha1_valid ?
one->mode : S_IFLNK));
}
else {
/* we can borrow from the file in the work tree */
temp->name = name;
if (!one->sha1_valid)
strcpy(temp->hex, sha1_to_hex(null_sha1));
else
strcpy(temp->hex, sha1_to_hex(one->sha1));
/* Even though we may sometimes borrow the
* contents from the work tree, we always want
* one->mode. mode is trustworthy even when
* !(one->sha1_valid), as long as
* DIFF_FILE_VALID(one).
*/
sprintf(temp->mode, "%06o", one->mode);
}
return;
}
else {
if (diff_populate_filespec(one, 0))
die("cannot read data blob for %s", one->path);
prep_temp_blob(temp, one->data, one->size,
one->sha1, one->mode);
}
}
static void remove_tempfile(void)
{
int i;
for (i = 0; i < 2; i++)
if (diff_temp[i].name == diff_temp[i].tmp_path) {
unlink(diff_temp[i].name);
diff_temp[i].name = NULL;
}
}
static void remove_tempfile_on_signal(int signo)
{
remove_tempfile();
signal(SIGINT, SIG_DFL);
raise(signo);
}
static int spawn_prog(const char *pgm, const char **arg)
{
pid_t pid;
int status;
fflush(NULL);
pid = fork();
if (pid < 0)
die("unable to fork");
if (!pid) {
execvp(pgm, (char *const*) arg);
exit(255);
}
while (waitpid(pid, &status, 0) < 0) {
if (errno == EINTR)
continue;
return -1;
}
/* Earlier we did not check the exit status because
* diff exits non-zero if files are different, and
* we are not interested in knowing that. It was a
* mistake which made it harder to quit a diff-*
* session that uses the git-apply-patch-script as
* the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
* should also exit non-zero only when it wants to
* abort the entire diff-* session.
*/
if (WIFEXITED(status) && !WEXITSTATUS(status))
return 0;
return -1;
}
/* 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)
{
const char *spawn_arg[10];
struct diff_tempfile *temp = diff_temp;
int retval;
static int atexit_asked = 0;
const char *othername;
const char **arg = &spawn_arg[0];
othername = (other? other : name);
if (one && two) {
prepare_temp_file(name, &temp[0], one);
prepare_temp_file(othername, &temp[1], two);
if (! atexit_asked &&
(temp[0].name == temp[0].tmp_path ||
temp[1].name == temp[1].tmp_path)) {
atexit_asked = 1;
atexit(remove_tempfile);
}
signal(SIGINT, remove_tempfile_on_signal);
}
if (one && two) {
*arg++ = pgm;
*arg++ = name;
*arg++ = temp[0].name;
*arg++ = temp[0].hex;
*arg++ = temp[0].mode;
*arg++ = temp[1].name;
*arg++ = temp[1].hex;
*arg++ = temp[1].mode;
if (other) {
*arg++ = other;
*arg++ = xfrm_msg;
}
} else {
*arg++ = pgm;
*arg++ = name;
}
*arg = NULL;
retval = spawn_prog(pgm, spawn_arg);
remove_tempfile();
if (retval) {
fprintf(stderr, "external diff died, stopping at %s.\n", name);
exit(1);
}
}
static const char *external_diff_attr(const char *name)
{
struct git_attr_check attr_diff_check;
setup_diff_attr_check(&attr_diff_check);
if (!git_checkattr(name, 1, &attr_diff_check)) {
const char *value = attr_diff_check.value;
if (!ATTR_TRUE(value) &&
!ATTR_FALSE(value) &&
!ATTR_UNSET(value)) {
struct ll_diff_driver *drv;
read_config_if_needed();
for (drv = user_diff; drv; drv = drv->next)
if (!strcmp(drv->name, value))
return drv->cmd;
}
}
return NULL;
}
static void run_diff_cmd(const char *pgm,
const char *name,
const char *other,
struct diff_filespec *one,
struct diff_filespec *two,
const char *xfrm_msg,
struct diff_options *o,
int complete_rewrite)
{
if (!o->allow_external)
pgm = NULL;
else {
const char *cmd = external_diff_attr(name);
if (cmd)
pgm = cmd;
}
if (pgm) {
run_external_diff(pgm, name, other, one, two, xfrm_msg,
complete_rewrite);
return;
}
if (one && two)
builtin_diff(name, other ? other : name,
one, two, xfrm_msg, o, complete_rewrite);
else
printf("* Unmerged path %s\n", name);
}
static void diff_fill_sha1_info(struct diff_filespec *one)
{
if (DIFF_FILE_VALID(one)) {
if (!one->sha1_valid) {
struct stat st;
if (!strcmp(one->path, "-")) {
hashcpy(one->sha1, null_sha1);
return;
}
if (lstat(one->path, &st) < 0)
die("stat %s", one->path);
if (index_path(one->sha1, one->path, &st, 0))
die("cannot hash %s\n", one->path);
}
}
else
hashclr(one->sha1);
}
static int similarity_index(struct diff_filepair *p)
{
return p->score * 100 / MAX_SCORE;
}
static void run_diff(struct diff_filepair *p, struct diff_options *o)
{
const char *pgm = external_diff();
char msg[PATH_MAX*2+300], *xfrm_msg;
struct diff_filespec *one;
struct diff_filespec *two;
const char *name;
const char *other;
char *name_munged, *other_munged;
int complete_rewrite = 0;
int len;
if (DIFF_PAIR_UNMERGED(p)) {
/* unmerged */
run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
return;
}
name = p->one->path;
other = (strcmp(name, p->two->path) ? p->two->path : NULL);
name_munged = quote_one(name);
other_munged = quote_one(other);
one = p->one; two = p->two;
diff_fill_sha1_info(one);
diff_fill_sha1_info(two);
len = 0;
switch (p->status) {
case DIFF_STATUS_COPIED:
len += snprintf(msg + len, sizeof(msg) - len,
"similarity index %d%%\n"
"copy from %s\n"
"copy to %s\n",
similarity_index(p), name_munged, other_munged);
break;
case DIFF_STATUS_RENAMED:
len += snprintf(msg + len, sizeof(msg) - len,
"similarity index %d%%\n"
"rename from %s\n"
"rename to %s\n",
similarity_index(p), name_munged, other_munged);
break;
case DIFF_STATUS_MODIFIED:
if (p->score) {
len += snprintf(msg + len, sizeof(msg) - len,
"dissimilarity index %d%%\n",
similarity_index(p));
complete_rewrite = 1;
break;
}
/* fallthru */
default:
/* nothing */
;
}
if (hashcmp(one->sha1, two->sha1)) {
int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
if (o->binary) {
mmfile_t mf;
if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
(!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
abbrev = 40;
}
len += snprintf(msg + len, sizeof(msg) - len,
"index %.*s..%.*s",
abbrev, sha1_to_hex(one->sha1),
abbrev, sha1_to_hex(two->sha1));
if (one->mode == two->mode)
len += snprintf(msg + len, sizeof(msg) - len,
" %06o", one->mode);
len += snprintf(msg + len, sizeof(msg) - len, "\n");
}
if (len)
msg[--len] = 0;
xfrm_msg = len ? msg : NULL;
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, one, null, xfrm_msg, o, 0);
free(null);
null = alloc_filespec(one->path);
run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
free(null);
}
else
run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
complete_rewrite);
free(name_munged);
free(other_munged);
}
static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
struct diffstat_t *diffstat)
{
const char *name;
const char *other;
int complete_rewrite = 0;
if (DIFF_PAIR_UNMERGED(p)) {
/* unmerged */
builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
return;
}
name = p->one->path;
other = (strcmp(name, p->two->path) ? p->two->path : NULL);
diff_fill_sha1_info(p->one);
diff_fill_sha1_info(p->two);
if (p->status == DIFF_STATUS_MODIFIED && p->score)
complete_rewrite = 1;
builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
}
static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
{
const char *name;
const char *other;
if (DIFF_PAIR_UNMERGED(p)) {
/* unmerged */
return;
}
name = p->one->path;
other = (strcmp(name, p->two->path) ? p->two->path : NULL);
diff_fill_sha1_info(p->one);
diff_fill_sha1_info(p->two);
builtin_checkdiff(name, other, p->one, p->two, o);
}
void diff_setup(struct diff_options *options)
{
memset(options, 0, sizeof(*options));
options->line_termination = '\n';
options->break_opt = -1;
options->rename_limit = -1;
options->context = 3;
options->msg_sep = "";
options->change = diff_change;
options->add_remove = diff_addremove;
options->color_diff = diff_use_color_default;
options->detect_rename = diff_detect_rename_default;
}
int diff_setup_done(struct diff_options *options)
{
int count = 0;
if (options->output_format & DIFF_FORMAT_NAME)
count++;
if (options->output_format & DIFF_FORMAT_NAME_STATUS)
count++;
if (options->output_format & DIFF_FORMAT_CHECKDIFF)
count++;
if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
count++;
if (count > 1)
die("--name-only, --name-status, --check and -s are mutually exclusive");
if (options->find_copies_harder)
options->detect_rename = DIFF_DETECT_COPY;
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_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_SUMMARY |
DIFF_FORMAT_CHECKDIFF))
options->recursive = 1;
/*
* Also pickaxe would not work very well if you do not say recursive
*/
if (options->pickaxe)
options->recursive = 1;
if (options->detect_rename && options->rename_limit < 0)
options->rename_limit = diff_rename_limit_default;
if (options->setup & DIFF_SETUP_USE_CACHE) {
if (!active_cache)
/* read-cache does not die even when it fails
* so it is safe for us to do this here. Also
* it does not smudge active_cache or active_nr
* when it fails, so we do not have to worry about
* cleaning it up ourselves either.
*/
read_cache();
}
if (options->abbrev <= 0 || 40 < options->abbrev)
options->abbrev = 40; /* 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->quiet) {
options->output_format = DIFF_FORMAT_NO_OUTPUT;
options->exit_with_status = 1;
}
/*
* If we postprocess in diffcore, we cannot simply return
* upon the first hit. We need to run diff as usual.
*/
if (options->pickaxe || options->filter)
options->quiet = 0;
return 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 = strchr(arg, '=');
if (eq)
len = eq - arg;
else
len = strlen(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);
int diff_opt_parse(struct diff_options *options, const char **av, int ac)
{
const char *arg = av[0];
if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
options->output_format |= DIFF_FORMAT_PATCH;
else if (opt_arg(arg, 'U', "unified", &options->context))
options->output_format |= DIFF_FORMAT_PATCH;
else if (!strcmp(arg, "--raw"))
options->output_format |= DIFF_FORMAT_RAW;
else if (!strcmp(arg, "--patch-with-raw")) {
options->output_format |= DIFF_FORMAT_PATCH | 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 (!prefixcmp(arg, "--stat")) {
char *end;
int width = options->stat_width;
int name_width = options->stat_name_width;
arg += 6;
end = (char *)arg;
switch (*arg) {
case '-':
if (!prefixcmp(arg, "-width="))
width = strtoul(arg + 7, &end, 10);
else if (!prefixcmp(arg, "-name-width="))
name_width = strtoul(arg + 12, &end, 10);
break;
case '=':
width = strtoul(arg+1, &end, 10);
if (*end == ',')
name_width = 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_width = width;
}
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")) {
options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
}
else if (!strcmp(arg, "-z"))
options->line_termination = 0;
else if (!prefixcmp(arg, "-l"))
options->rename_limit = strtoul(arg+2, NULL, 10);
else if (!strcmp(arg, "--full-index"))
options->full_index = 1;
else if (!strcmp(arg, "--binary")) {
options->output_format |= DIFF_FORMAT_PATCH;
options->binary = 1;
}
else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
options->text = 1;
}
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, "-R"))
options->reverse_diff = 1;
else if (!prefixcmp(arg, "-S"))
options->pickaxe = arg + 2;
else if (!strcmp(arg, "-s")) {
options->output_format |= DIFF_FORMAT_NO_OUTPUT;
}
else if (!prefixcmp(arg, "-O"))
options->orderfile = arg + 2;
else if (!prefixcmp(arg, "--diff-filter="))
options->filter = arg + 14;
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 (!prefixcmp(arg, "-B")) {
if ((options->break_opt =
diff_scoreopt_parse(arg)) == -1)
return -1;
}
else if (!prefixcmp(arg, "-M")) {
if ((options->rename_score =
diff_scoreopt_parse(arg)) == -1)
return -1;
options->detect_rename = DIFF_DETECT_RENAME;
}
else if (!prefixcmp(arg, "-C")) {
if (options->detect_rename == DIFF_DETECT_COPY)
options->find_copies_harder = 1;
if ((options->rename_score =
diff_scoreopt_parse(arg)) == -1)
return -1;
options->detect_rename = DIFF_DETECT_COPY;
}
else if (!strcmp(arg, "--find-copies-harder"))
options->find_copies_harder = 1;
else if (!strcmp(arg, "--follow"))
options->follow_renames = 1;
else if (!strcmp(arg, "--abbrev"))
options->abbrev = DEFAULT_ABBREV;
else if (!prefixcmp(arg, "--abbrev=")) {
options->abbrev = strtoul(arg + 9, NULL, 10);
if (options->abbrev < MINIMUM_ABBREV)
options->abbrev = MINIMUM_ABBREV;
else if (40 < options->abbrev)
options->abbrev = 40;
}
else if (!strcmp(arg, "--color"))
options->color_diff = 1;
else if (!strcmp(arg, "--no-color"))
options->color_diff = 0;
else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
options->xdl_opts |= XDF_IGNORE_WHITESPACE;
else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
else if (!strcmp(arg, "--ignore-space-at-eol"))
options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
else if (!strcmp(arg, "--color-words"))
options->color_diff = options->color_diff_words = 1;
else if (!strcmp(arg, "--no-renames"))
options->detect_rename = 0;
else if (!strcmp(arg, "--exit-code"))
options->exit_with_status = 1;
else if (!strcmp(arg, "--quiet"))
options->quiet = 1;
else if (!strcmp(arg, "--ext-diff"))
options->allow_external = 1;
else if (!strcmp(arg, "--no-ext-diff"))
options->allow_external = 0;
else
return 0;
return 1;
}
static int parse_num(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 != 'M' && cmd != 'C' && cmd != 'B')
return -1; /* that is not a -M, -C nor -B option */
opt1 = parse_num(&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_num(&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)
{
if (queue->alloc <= queue->nr) {
queue->alloc = alloc_nr(queue->alloc);
queue->queue = xrealloc(queue->queue,
sizeof(dp) * 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)
{
diff_free_filespec_data(p->one);
diff_free_filespec_data(p->two);
free(p->one);
free(p->two);
free(p);
}
/* This is different from find_unique_abbrev() in that
* it stuffs the result with dots for alignment.
*/
const char *diff_unique_abbrev(const unsigned char *sha1, int len)
{
int abblen;
const char *abbrev;
if (len == 40)
return sha1_to_hex(sha1);
abbrev = find_unique_abbrev(sha1, len);
if (!abbrev)
return sha1_to_hex(sha1);
abblen = strlen(abbrev);
if (abblen < 37) {
static char hex[41];
if (len < abblen && abblen <= len + 2)
sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
else
sprintf(hex, "%s...", abbrev);
return hex;
}
return sha1_to_hex(sha1);
}
static void diff_flush_raw(struct diff_filepair *p,
struct diff_options *options)
{
int two_paths;
char status[10];
int abbrev = options->abbrev;
const char *path_one, *path_two;
int inter_name_termination = '\t';
int line_termination = options->line_termination;
if (!line_termination)
inter_name_termination = 0;
path_one = p->one->path;
path_two = p->two->path;
if (line_termination) {
path_one = quote_one(path_one);
path_two = quote_one(path_two);
}
if (p->score)
sprintf(status, "%c%03d", p->status, similarity_index(p));
else {
status[0] = p->status;
status[1] = 0;
}
switch (p->status) {
case DIFF_STATUS_COPIED:
case DIFF_STATUS_RENAMED:
two_paths = 1;
break;
case DIFF_STATUS_ADDED:
case DIFF_STATUS_DELETED:
two_paths = 0;
break;
default:
two_paths = 0;
break;
}
if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
printf(":%06o %06o %s ",
p->one->mode, p->two->mode,
diff_unique_abbrev(p->one->sha1, abbrev));
printf("%s ",
diff_unique_abbrev(p->two->sha1, abbrev));
}
printf("%s%c%s", status, inter_name_termination,
two_paths || p->one->mode ? path_one : path_two);
if (two_paths)
printf("%c%s", inter_name_termination, path_two);
putchar(line_termination);
if (path_one != p->one->path)
free((void*)path_one);
if (path_two != p->two->path)
free((void*)path_two);
}
static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
{
char *path = p->two->path;
if (opt->line_termination)
path = quote_one(p->two->path);
printf("%s%c", path, opt->line_termination);
if (p->two->path != path)
free(path);
}
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, *two;
if (DIFF_PAIR_UNMERGED(p))
return 0; /* unmerged is interesting */
one = p->one;
two = p->two;
/* 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->sha1_valid && two->sha1_valid &&
!hashcmp(one->sha1, two->sha1))
return 1; /* no change */
if (!one->sha1_valid && !two->sha1_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 tree diffs in patch format */
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; /* no tree diffs in patch format */
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->sha1_valid ? sha1_to_hex(s->sha1) : "");
fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
x, one ? one : "",
s->size, s->xfrm_flags);
}
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 stays %d broken %d\n",
p->score, p->status ? p->status : '?',
p->source_stays, 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, j;
struct diff_filepair *p, *pp;
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)) {
if (p->source_stays) {
p->status = DIFF_STATUS_COPIED;
continue;
}
/* See if there is some other filepair that
* copies from the same source as us. If so
* we are a copy. Otherwise we are either a
* copy if the path stays, or a rename if it
* does not, but we already handled "stays" case.
*/
for (j = i + 1; j < q->nr; j++) {
pp = q->queue[j];
if (strcmp(pp->one->path, p->one->path))
continue; /* not us */
if (!DIFF_PAIR_RENAME(pp))
continue; /* not a rename/copy */
/* pp is a rename/copy from the same source */
p->status = DIFF_STATUS_COPIED;
break;
}
if (!p->status)
p->status = DIFF_STATUS_RENAMED;
}
else if (hashcmp(p->one->sha1, p->two->sha1) ||
p->one->mode != p->two->mode ||
is_null_sha1(p->one->sha1))
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)
diff_flush_name(p, opt);
}
static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
{
char *name = quote_one(fs->path);
if (fs->mode)
printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
else
printf(" %s %s\n", newdelete, name);
free(name);
}
static void show_mode_change(struct diff_filepair *p, int show_name)
{
if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
if (show_name) {
char *name = quote_one(p->two->path);
printf(" mode change %06o => %06o %s\n",
p->one->mode, p->two->mode, name);
free(name);
}
else
printf(" mode change %06o => %06o\n",
p->one->mode, p->two->mode);
}
}
static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
{
char *names = pprint_rename(p->one->path, p->two->path);
printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
free(names);
show_mode_change(p, 0);
}
static void diff_summary(struct diff_filepair *p)
{
switch(p->status) {
case DIFF_STATUS_DELETED:
show_file_mode_name("delete", p->one);
break;
case DIFF_STATUS_ADDED:
show_file_mode_name("create", p->two);
break;
case DIFF_STATUS_COPIED:
show_rename_copy("copy", p);
break;
case DIFF_STATUS_RENAMED:
show_rename_copy("rename", p);
break;
default:
if (p->score) {
char *name = quote_one(p->two->path);
printf(" rewrite %s (%d%%)\n", name,
similarity_index(p));
free(name);
show_mode_change(p, 0);
} else show_mode_change(p, 1);
break;
}
}
struct patch_id_t {
struct xdiff_emit_state xm;
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 (!prefixcmp(line, "@@ -"))
return;
new_len = remove_space(line, len);
SHA1_Update(data->ctx, line, new_len);
data->patchlen += new_len;
}
/* returns 0 upon success, and writes result into sha1 */
static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i;
SHA_CTX ctx;
struct patch_id_t data;
char buffer[PATH_MAX * 4 + 20];
SHA1_Init(&ctx);
memset(&data, 0, sizeof(struct patch_id_t));
data.ctx = &ctx;
data.xm.consume = patch_id_consume;
for (i = 0; i < q->nr; i++) {
xpparam_t xpp;
xdemitconf_t xecfg;
xdemitcb_t ecb;
mmfile_t mf1, mf2;
struct diff_filepair *p = q->queue[i];
int len1, len2;
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_sha1_info(p->one);
diff_fill_sha1_info(p->two);
if (fill_mmfile(&mf1, p->one) < 0 ||
fill_mmfile(&mf2, p->two) < 0)
return error("unable to read files to diff");
/* Maybe hash p->two? into the patch id? */
if (diff_filespec_is_binary(p->two))
continue;
len1 = remove_space(p->one->path, strlen(p->one->path));
len2 = remove_space(p->two->path, strlen(p->two->path));
if (p->one->mode == 0)
len1 = snprintf(buffer, sizeof(buffer),
"diff--gita/%.*sb/%.*s"
"newfilemode%06o"
"---/dev/null"
"+++b/%.*s",
len1, p->one->path,
len2, p->two->path,
p->two->mode,
len2, p->two->path);
else if (p->two->mode == 0)
len1 = snprintf(buffer, sizeof(buffer),
"diff--gita/%.*sb/%.*s"
"deletedfilemode%06o"
"---a/%.*s"
"+++/dev/null",
len1, p->one->path,
len2, p->two->path,
p->one->mode,
len1, p->one->path);
else
len1 = snprintf(buffer, sizeof(buffer),
"diff--gita/%.*sb/%.*s"
"---a/%.*s"
"+++b/%.*s",
len1, p->one->path,
len2, p->two->path,
len1, p->one->path,
len2, p->two->path);
SHA1_Update(&ctx, buffer, len1);
xpp.flags = XDF_NEED_MINIMAL;
xecfg.ctxlen = 3;
xecfg.flags = XDL_EMIT_FUNCNAMES;
ecb.outf = xdiff_outf;
ecb.priv = &data;
xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
}
SHA1_Final(sha1, &ctx);
return 0;
}
int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i;
int result = diff_get_patch_id(options, sha1);
for (i = 0; i < q->nr; i++)
diff_free_filepair(q->queue[i]);
free(q->queue);
q->queue = NULL;
q->nr = q->alloc = 0;
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;
}
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;
/*
* 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_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
struct diffstat_t diffstat;
memset(&diffstat, 0, sizeof(struct diffstat_t));
diffstat.xm.consume = diffstat_consume;
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);
else if (output_format & DIFF_FORMAT_SHORTSTAT)
show_shortstats(&diffstat);
separator++;
}
if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
for (i = 0; i < q->nr; i++)
diff_summary(q->queue[i]);
separator++;
}
if (output_format & DIFF_FORMAT_PATCH) {
if (separator) {
if (options->stat_sep) {
/* attach patch instead of inline */
fputs(options->stat_sep, stdout);
} else {
putchar(options->line_termination);
}
}
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 (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);
q->queue = NULL;
q->nr = q->alloc = 0;
}
static void diffcore_apply_filter(const char *filter)
{
int i;
struct diff_queue_struct *q = &diff_queued_diff;
struct diff_queue_struct outq;
outq.queue = NULL;
outq.nr = outq.alloc = 0;
if (!filter)
return;
if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
int found;
for (i = found = 0; !found && i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (((p->status == DIFF_STATUS_MODIFIED) &&
((p->score &&
strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
(!p->score &&
strchr(filter, DIFF_STATUS_MODIFIED)))) ||
((p->status != DIFF_STATUS_MODIFIED) &&
strchr(filter, p->status)))
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 (((p->status == DIFF_STATUS_MODIFIED) &&
((p->score &&
strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
(!p->score &&
strchr(filter, DIFF_STATUS_MODIFIED)))) ||
((p->status != DIFF_STATUS_MODIFIED) &&
strchr(filter, p->status)))
diff_q(&outq, p);
else
diff_free_filepair(p);
}
}
free(q->queue);
*q = outq;
}
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;
outq.queue = NULL;
outq.nr = outq.alloc = 0;
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
/*
* 1. Entries that come from stat info dirtyness
* 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->sha1_valid && p->two->sha1_valid) ||
(p->one->mode != p->two->mode) ||
diff_populate_filespec(p->one, 1) ||
diff_populate_filespec(p->two, 1) ||
(p->one->size != p->two->size) ||
diff_populate_filespec(p->one, 0) || /* (2) */
diff_populate_filespec(p->two, 0) ||
memcmp(p->one->data, p->two->data, p->one->size))
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.
*/
diffopt->skip_stat_unmatch++;
diff_free_filepair(p);
}
}
free(q->queue);
*q = outq;
}
void diffcore_std(struct diff_options *options)
{
if (options->quiet)
return;
if (options->skip_stat_unmatch && !options->find_copies_harder)
diffcore_skip_stat_unmatch(options);
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)
diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
if (options->orderfile)
diffcore_order(options->orderfile);
diff_resolve_rename_copy();
diffcore_apply_filter(options->filter);
options->has_changes = !!diff_queued_diff.nr;
}
void diff_addremove(struct diff_options *options,
int addremove, unsigned mode,
const unsigned char *sha1,
const char *base, const char *path)
{
char concatpath[PATH_MAX];
struct diff_filespec *one, *two;
/* 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->reverse_diff)
addremove = (addremove == '+' ? '-' :
addremove == '-' ? '+' : addremove);
if (!path) path = "";
sprintf(concatpath, "%s%s", base, path);
one = alloc_filespec(concatpath);
two = alloc_filespec(concatpath);
if (addremove != '+')
fill_filespec(one, sha1, mode);
if (addremove != '-')
fill_filespec(two, sha1, mode);
diff_queue(&diff_queued_diff, one, two);
options->has_changes = 1;
}
void diff_change(struct diff_options *options,
unsigned old_mode, unsigned new_mode,
const unsigned char *old_sha1,
const unsigned char *new_sha1,
const char *base, const char *path)
{
char concatpath[PATH_MAX];
struct diff_filespec *one, *two;
if (options->reverse_diff) {
unsigned tmp;
const unsigned char *tmp_c;
tmp = old_mode; old_mode = new_mode; new_mode = tmp;
tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
}
if (!path) path = "";
sprintf(concatpath, "%s%s", base, path);
one = alloc_filespec(concatpath);
two = alloc_filespec(concatpath);
fill_filespec(one, old_sha1, old_mode);
fill_filespec(two, new_sha1, new_mode);
diff_queue(&diff_queued_diff, one, two);
options->has_changes = 1;
}
void diff_unmerge(struct diff_options *options,
const char *path,
unsigned mode, const unsigned char *sha1)
{
struct diff_filespec *one, *two;
one = alloc_filespec(path);
two = alloc_filespec(path);
fill_filespec(one, sha1, mode);
diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
}
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