show-diff.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 static void show_differences(struct cache_entry *ce, struct stat *cur,
   9         void *old_contents, unsigned long long old_size)
  10 {
  11         static char cmd[1000];
  12         FILE *f;
  13
  14         snprintf(cmd, sizeof(cmd), "diff -u - %s", ce->name);
  15         f = popen(cmd, "w");
  16         fwrite(old_contents, old_size, 1, f);
  17         pclose(f);
  18 }
  19
  20 int main(int argc, char **argv)
  21 {
  22         int entries = read_cache();
  23         int i;
  24
  25         if (entries < 0) {
  26                 perror("read_cache");
  27                 exit(1);
  28         }
  29         for (i = 0; i < entries; i++) {
  30                 struct stat st;
  31                 struct cache_entry *ce = active_cache[i];
  32                 int n, changed;
  33                 unsigned long size;
  34                 char type[20];
  35                 void *new;
  36
  37                 if (stat(ce->name, &st) < 0) {
  38                         printf("%s: %s\n", ce->name, strerror(errno));
  39                         continue;
  40                 }
  41                 changed = cache_match_stat(ce, &st);
  42                 if (!changed)
  43                         continue;
  44                 printf("%.*s:  ", ce->namelen, ce->name);
  45                 for (n = 0; n < 20; n++)
  46                         printf("%02x", ce->sha1[n]);
  47                 printf("\n");
  48                 new = read_sha1_file(ce->sha1, type, &size);
  49                 show_differences(ce, &st, new, size);
  50                 free(new);
  51         }
  52         return 0;
  53 }