diff-cache.c

   1 #include "cache.h"
   2
   3 static int cached_only = 0;
   4 static int line_termination = '\n';
   5
   6 /* A file entry went away or appeared */
   7 static void show_file(const char *prefix, struct cache_entry *ce)
   8 {
   9         printf("%s%o\t%s\t%s\t%s%c", prefix, ntohl(ce->ce_mode), "blob",
  10                sha1_to_hex(ce->sha1), ce->name, line_termination);
  11 }
  12
  13 static int show_modified(struct cache_entry *old, struct cache_entry *new)
  14 {
  15         unsigned int mode = ntohl(new->ce_mode), oldmode;
  16         unsigned char *sha1 = new->sha1;
  17         unsigned char old_sha1_hex[60];
  18
  19         if (!cached_only) {
  20                 static unsigned char no_sha1[20];
  21                 int changed;
  22                 struct stat st;
  23                 if (stat(new->name, &st) < 0) {
  24                         show_file("-", old);
  25                         return -1;
  26                 }
  27                 changed = cache_match_stat(new, &st);
  28                 if (changed) {
  29                         mode = st.st_mode;
  30                         sha1 = no_sha1;
  31                 }
  32         }
  33
  34         oldmode = ntohl(old->ce_mode);
  35         if (mode == oldmode && !memcmp(sha1, old->sha1, 20))
  36                 return 0;
  37
  38         strcpy(old_sha1_hex, sha1_to_hex(old->sha1));
  39         printf("*%o->%o\t%s\t%s->%s\t%s%c", oldmode, mode,
  40                "blob",
  41                old_sha1_hex, sha1_to_hex(sha1),
  42                old->name, line_termination);
  43         return 0;
  44 }
  45
  46 static int diff_cache(struct cache_entry **ac, int entries)
  47 {
  48         while (entries) {
  49                 struct cache_entry *ce = *ac;
  50
  51                 /* No matching 0-stage (current) entry? Show it as deleted */
  52                 if (ce_stage(ce)) {
  53                         show_file("-", ce);
  54                         ac++;
  55                         entries--;
  56                         continue;
  57                 }
  58                 /* No matching 1-stage (tree) entry? Show the current one as added */
  59                 if (entries == 1 || !same_name(ce, ac[1])) {
  60                         show_file("-", ce);
  61                         ac++;
  62                         entries--;
  63                         continue;
  64                 }
  65                 show_modified(ac[1], ce);
  66                 ac += 2;
  67                 entries -= 2;
  68                 continue;
  69         }
  70         return 0;
  71 }
  72
  73 static void remove_merge_entries(void)
  74 {
  75         int i;
  76         for (i = 0; i < active_nr; i++) {
  77                 struct cache_entry *ce = active_cache[i];
  78                 if (!ce_stage(ce))
  79                         break;
  80                 printf("%s: unmerged\n", ce->name);
  81                 while (remove_entry_at(i)) {
  82                         if (!ce_stage(active_cache[i]))
  83                                 break;
  84                 }
  85         }
  86 }
  87
  88 static char *diff_cache_usage = "diff-cache [-r] [-z] [--cached] <tree sha1>";
  89
  90 int main(int argc, char **argv)
  91 {
  92         unsigned char tree_sha1[20];
  93         void *tree;
  94         unsigned long size;
  95
  96         read_cache();
  97         while (argc > 2) {
  98                 char *arg = argv[1];
  99                 argv++;
 100                 argc--;
 101                 if (!strcmp(arg, "-r")) {
 102                         /* We accept the -r flag just to look like diff-tree */
 103                         continue;
 104                 }
 105                 if (!strcmp(arg, "-z")) {
 106                         line_termination = '\0';
 107                         continue;
 108                 }
 109                 if (!strcmp(arg, "--cached")) {
 110                         cached_only = 1;
 111                         continue;
 112                 }
 113                 usage(diff_cache_usage);
 114         }
 115
 116         if (argc != 2 || get_sha1_hex(argv[1], tree_sha1))
 117                 usage(diff_cache_usage);
 118
 119         remove_merge_entries();
 120
 121         tree = read_tree_with_tree_or_commit_sha1(tree_sha1, &size, 0);
 122         if (!tree)
 123                 die("bad tree object %s", argv[1]);
 124         if (read_tree(tree, size, 1))
 125                 die("unable to read tree object %s", argv[1]);
 126
 127         return diff_cache(active_cache, active_nr);
 128 }