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 const char *show_diff_usage = "show-diff [-q] [-s] [-z] [paths...]";
   9
  10 static int recursive = 0;
  11 static int line_termination = '\n';
  12 static int silent = 0;
  13 static int silent_on_nonexisting_files = 0;
  14
  15 static int matches_pathspec(struct cache_entry *ce, char **spec, int cnt)
  16 {
  17         int i;
  18         int namelen = ce_namelen(ce);
  19         for (i = 0; i < cnt; i++) {
  20                 int speclen = strlen(spec[i]);
  21                 if (! strncmp(spec[i], ce->name, speclen) &&
  22                     speclen <= namelen &&
  23                     (ce->name[speclen] == 0 ||
  24                      ce->name[speclen] == '/'))
  25                         return 1;
  26         }
  27         return 0;
  28 }
  29
  30 static void show_file(const char *prefix, struct cache_entry *ce)
  31 {
  32         printf("%s%o\t%s\t%s\t%s%c", prefix, ntohl(ce->ce_mode), "blob",
  33                 sha1_to_hex(ce->sha1), ce->name, line_termination);
  34 }
  35
  36 int main(int argc, char **argv)
  37 {
  38         static const char null_sha1_hex[] = "0000000000000000000000000000000000000000";
  39         int entries = read_cache();
  40         int i;
  41
  42         while (1 < argc && argv[1][0] == '-') {
  43                 if (!strcmp(argv[1], "-s"))
  44                         silent_on_nonexisting_files = silent = 1;
  45                 else if (!strcmp(argv[1], "-q"))
  46                         silent_on_nonexisting_files = 1;
  47                 else if (!strcmp(argv[1], "-z"))
  48                         line_termination = 0;
  49                 else if (!strcmp(argv[1], "-r"))
  50                         recursive = 1;          /* No-op */
  51                 else
  52                         usage(show_diff_usage);
  53                 argv++; argc--;
  54         }
  55
  56         /* At this point, if argc == 1, then we are doing everything.
  57          * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
  58          */
  59         if (entries < 0) {
  60                 perror("read_cache");
  61                 exit(1);
  62         }
  63
  64         for (i = 0; i < entries; i++) {
  65                 struct stat st;
  66                 unsigned int oldmode, mode;
  67                 struct cache_entry *ce = active_cache[i];
  68                 int changed;
  69
  70                 if (1 < argc &&
  71                     ! matches_pathspec(ce, argv+1, argc-1))
  72                         continue;
  73
  74                 if (ce_stage(ce)) {
  75                         printf("U %s%c", ce->name, line_termination);
  76
  77                         while (i < entries &&
  78                                !strcmp(ce->name, active_cache[i]->name))
  79                                 i++;
  80                         i--; /* compensate for loop control increments */
  81                         continue;
  82                 }
  83
  84                 if (stat(ce->name, &st) < 0) {
  85                         if (errno != ENOENT) {
  86                                 perror(ce->name);
  87                                 continue;
  88                         }
  89                         if (silent_on_nonexisting_files)
  90                                 continue;
  91                         show_file("-", ce);
  92                         continue;
  93                 }
  94                 changed = cache_match_stat(ce, &st);
  95                 if (!changed)
  96                         continue;
  97
  98                 oldmode = ntohl(ce->ce_mode);
  99                 mode = S_IFREG | ce_permissions(st.st_mode);
 100
 101                 printf("*%o->%o\t%s\t%s->%s\t%s%c",
 102                         oldmode, mode, "blob",
 103                         sha1_to_hex(ce->sha1), null_sha1_hex,
 104                         ce->name, line_termination);
 105         }
 106         return 0;
 107 }