show-diff.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "diff.h"
   8
   9 static const char *show_diff_usage = "show-diff [-q] [-s] [-z] [paths...]";
  10
  11 static int matches_pathspec(struct cache_entry *ce, char **spec, int cnt)
  12 {
  13         int i;
  14         int namelen = ce_namelen(ce);
  15         for (i = 0; i < cnt; i++) {
  16                 int speclen = strlen(spec[i]);
  17                 if (! strncmp(spec[i], ce->name, speclen) &&
  18                     speclen <= namelen &&
  19                     (ce->name[speclen] == 0 ||
  20                      ce->name[speclen] == '/'))
  21                         return 1;
  22         }
  23         return 0;
  24 }
  25
  26 int main(int argc, char **argv)
  27 {
  28         int silent = 0;
  29         int silent_on_nonexisting_files = 0;
  30         int machine_readable = 0;
  31         int reverse = 0;
  32         int entries = read_cache();
  33         int i;
  34
  35         while (1 < argc && argv[1][0] == '-') {
  36                 if  (!strcmp(argv[1], "-R"))
  37                         reverse = 1;
  38                 else if (!strcmp(argv[1], "-s"))
  39                         silent_on_nonexisting_files = silent = 1;
  40                 else if (!strcmp(argv[1], "-q"))
  41                         silent_on_nonexisting_files = 1;
  42                 else if (!strcmp(argv[1], "-z"))
  43                         machine_readable = 1;
  44                 else
  45                         usage(show_diff_usage);
  46                 argv++; argc--;
  47         }
  48
  49         /* At this point, if argc == 1, then we are doing everything.
  50          * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
  51          */
  52         if (entries < 0) {
  53                 perror("read_cache");
  54                 exit(1);
  55         }
  56         prepare_diff_cmd();
  57         for (i = 0; i < entries; i++) {
  58                 struct stat st;
  59                 struct cache_entry *ce = active_cache[i];
  60                 int changed;
  61                 unsigned long size;
  62                 char type[20];
  63                 void *old;
  64
  65                 if (1 < argc &&
  66                     ! matches_pathspec(ce, argv+1, argc-1))
  67                         continue;
  68
  69                 if (ce_stage(ce)) {
  70                         if (machine_readable)
  71                                 printf("U %s%c", ce->name, 0);
  72                         else
  73                                 printf("%s: Unmerged\n",
  74                                        ce->name);
  75                         while (i < entries &&
  76                                !strcmp(ce->name, active_cache[i]->name))
  77                                 i++;
  78                         i--; /* compensate for loop control increments */
  79                         continue;
  80                 }
  81
  82                 if (stat(ce->name, &st) < 0) {
  83                         if (errno == ENOENT && silent_on_nonexisting_files)
  84                                 continue;
  85                         if (machine_readable)
  86                                 printf("X %s%c", ce->name, 0);
  87                         else {
  88                                 printf("%s: %s\n", ce->name, strerror(errno));
  89                                 if (errno == ENOENT)
  90                                         show_diff_empty(ce->sha1, ce->name,
  91                                                         reverse);
  92                         }
  93                         continue;
  94                 }
  95                 changed = cache_match_stat(ce, &st);
  96                 if (!changed)
  97                         continue;
  98                 if (!machine_readable)
  99                         printf("%s: %s\n", ce->name, sha1_to_hex(ce->sha1));
 100                 else {
 101                         printf("%s %s%c", sha1_to_hex(ce->sha1), ce->name, 0);
 102                         continue;
 103                 }
 104                 if (silent)
 105                         continue;
 106
 107                 old = read_sha1_file(ce->sha1, type, &size);
 108                 if (! old)
 109                         error("unable to read blob object for %s (%s)",
 110                               ce->name, sha1_to_hex(ce->sha1));
 111                 else
 112                         show_differences(ce->name, ce->name, old, size,
 113                                          reverse);
 114                 free(old);
 115         }
 116         return 0;
 117 }