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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
static void show_differences(char *name,
void *old_contents, unsigned long long old_size)
{
static char cmd[1000];
FILE *f;
snprintf(cmd, sizeof(cmd), "diff -L %s -u -N - %s", name, name);
f = popen(cmd, "w");
if (old_size)
fwrite(old_contents, old_size, 1, f);
pclose(f);
}
static void show_diff_empty(struct cache_entry *ce)
{
char *old;
unsigned long int size;
int lines=0;
unsigned char type[20], *p, *end;
old = read_sha1_file(ce->sha1, type, &size);
if (size > 0) {
int startline = 1;
int c = 0;
printf("--- %s\n", ce->name);
printf("+++ /dev/null\n");
p = old;
end = old + size;
while (p < end)
if (*p++ == '\n')
lines ++;
printf("@@ -1,%d +0,0 @@\n", lines);
p = old;
while (p < end) {
c = *p++;
if (startline) {
putchar('-');
startline = 0;
}
putchar(c);
if (c == '\n')
startline = 1;
}
if (c!='\n')
printf("\n");
fflush(stdout);
}
}
static const char *show_diff_usage = "show-diff [-s] [-q] [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 entries = read_cache();
int i;
while (1 < argc && argv[1][0] == '-') {
if (!strcmp(argv[1], "-s"))
silent_on_nonexisting_files = silent = 1;
else if (!strcmp(argv[1], "-q"))
silent_on_nonexisting_files = 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);
}
for (i = 0; i < entries; i++) {
struct stat st;
struct cache_entry *ce = active_cache[i];
int n, changed;
unsigned long size;
char type[20];
void *new;
if (1 <argc &&
! matches_pathspec(ce, argv+1, argc-1))
continue;
if (stat(ce->name, &st) < 0) {
if (errno == ENOENT && silent_on_nonexisting_files)
continue;
printf("%s: %s\n", ce->name, strerror(errno));
if (errno == ENOENT)
show_diff_empty(ce);
continue;
}
changed = cache_match_stat(ce, &st);
if (!changed)
continue;
printf("%s: ", ce->name);
for (n = 0; n < 20; n++)
printf("%02x", ce->sha1[n]);
printf("\n");
fflush(stdout);
if (silent)
continue;
new = read_sha1_file(ce->sha1, type, &size);
show_differences(ce->name, new, size);
free(new);
}
return 0;
}
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