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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
static char *diff_cmd = "diff -L 'a/%s' -L 'b/%s' ";
static char *diff_opts = "-p -u";
static char *diff_arg_forward = " - '%s'";
static char *diff_arg_reverse = " '%s' -";
static void prepare_diff_cmd(void)
{
/*
* Default values above are meant to match the
* Linux kernel development style. Examples of
* alternative styles you can specify via environment
* variables are:
*
* GIT_DIFF_CMD="diff -L '%s' -L '%s'"
* GIT_DIFF_OPTS="-c";
*/
diff_cmd = getenv("GIT_DIFF_CMD") ? : diff_cmd;
diff_opts = getenv("GIT_DIFF_OPTS") ? : diff_opts;
}
/* Help to copy the thing properly quoted for the shell safety.
* any single quote is replaced with '\'', and the caller is
* expected to enclose the result within a single quote pair.
*
* E.g.
* original sq_expand result
* name ==> name ==> 'name'
* a b ==> a b ==> 'a b'
* a'b ==> a'\''b ==> 'a'\''b'
*/
static char *sq_expand(char *src)
{
static char *buf = NULL;
int cnt, c;
char *cp;
/* count bytes needed to store the quoted string. */
for (cnt = 1, cp = src; *cp; cnt++, cp++)
if (*cp == '\'')
cnt += 3;
if (! (buf = malloc(cnt)))
return buf;
cp = buf;
while ((c = *src++)) {
if (c != '\'')
*cp++ = c;
else {
cp = strcpy(cp, "'\\''");
cp += 4;
}
}
*cp = 0;
return buf;
}
static void show_differences(char *name, char *label, void *old_contents,
unsigned long long old_size, int reverse)
{
FILE *f;
char *name_sq = sq_expand(name);
char *label_sq = (name != label) ? sq_expand(label) : name_sq;
char *diff_arg = reverse ? diff_arg_reverse : diff_arg_forward;
int cmd_size = strlen(name_sq) + strlen(label_sq) * 2 +
strlen(diff_cmd) + strlen(diff_opts) + strlen(diff_arg);
char *cmd = malloc(cmd_size);
int next_at;
fflush(stdout);
next_at = snprintf(cmd, cmd_size, diff_cmd, label_sq, label_sq);
next_at += snprintf(cmd+next_at, cmd_size-next_at, "%s", diff_opts);
next_at += snprintf(cmd+next_at, cmd_size-next_at, diff_arg, name_sq);
f = popen(cmd, "w");
if (old_size)
fwrite(old_contents, old_size, 1, f);
pclose(f);
if (label_sq != name_sq)
free(label_sq);
free(name_sq);
free(cmd);
}
static void show_diff_empty(struct cache_entry *ce, int reverse)
{
char *old;
unsigned long int size;
unsigned char type[20];
old = read_sha1_file(ce->sha1, type, &size);
if (! old) {
error("unable to read blob object for %s (%s)", ce->name,
sha1_to_hex(ce->sha1));
return;
}
show_differences("/dev/null", ce->name, old, size, reverse);
}
static const char *show_diff_usage = "show-diff [-q] [-s] [-z] [paths...]";
static int matches_pathspec(struct cache_entry *ce, char **spec, int cnt)
{
int i;
int namelen = ce_namelen(ce);
for (i = 0; i < cnt; i++) {
int speclen = strlen(spec[i]);
if (! strncmp(spec[i], ce->name, speclen) &&
speclen <= namelen &&
(ce->name[speclen] == 0 ||
ce->name[speclen] == '/'))
return 1;
}
return 0;
}
int main(int argc, char **argv)
{
int silent = 0;
int silent_on_nonexisting_files = 0;
int machine_readable = 0;
int reverse = 0;
int entries = read_cache();
int i;
while (1 < argc && argv[1][0] == '-') {
if (!strcmp(argv[1], "-R"))
reverse = 1;
else if (!strcmp(argv[1], "-s"))
silent_on_nonexisting_files = silent = 1;
else if (!strcmp(argv[1], "-q"))
silent_on_nonexisting_files = 1;
else if (!strcmp(argv[1], "-z"))
machine_readable = 1;
else
usage(show_diff_usage);
argv++; argc--;
}
/* At this point, if argc == 1, then we are doing everything.
* Otherwise argv[1] .. argv[argc-1] have the explicit paths.
*/
if (entries < 0) {
perror("read_cache");
exit(1);
}
prepare_diff_cmd();
for (i = 0; i < entries; i++) {
struct stat st;
struct cache_entry *ce = active_cache[i];
int changed;
unsigned long size;
char type[20];
void *old;
if (1 < argc &&
! matches_pathspec(ce, argv+1, argc-1))
continue;
if (ce_stage(ce)) {
if (machine_readable)
printf("U %s%c", ce->name, 0);
else
printf("%s: Unmerged\n",
ce->name);
while (i < entries &&
!strcmp(ce->name, active_cache[i]->name))
i++;
i--; /* compensate for loop control increments */
continue;
}
if (stat(ce->name, &st) < 0) {
if (errno == ENOENT && silent_on_nonexisting_files)
continue;
if (machine_readable)
printf("X %s%c", ce->name, 0);
else {
printf("%s: %s\n", ce->name, strerror(errno));
if (errno == ENOENT)
show_diff_empty(ce, reverse);
}
continue;
}
changed = cache_match_stat(ce, &st);
if (!changed)
continue;
if (!machine_readable)
printf("%s: %s\n", ce->name, sha1_to_hex(ce->sha1));
else {
printf("%s %s%c", sha1_to_hex(ce->sha1), ce->name, 0);
continue;
}
if (silent)
continue;
old = read_sha1_file(ce->sha1, type, &size);
if (! old)
error("unable to read blob object for %s (%s)",
ce->name, sha1_to_hex(ce->sha1));
else
show_differences(ce->name, ce->name, old, size,
reverse);
free(old);
}
return 0;
}
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