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 =
  10 "show-diff [-p] [-q] [-r] [-z] [paths...]";
  11
  12 static int generate_patch = 0;
  13 static int line_termination = '\n';
  14 static int silent = 0;
  15
  16 static int matches_pathspec(struct cache_entry *ce, char **spec, int cnt)
  17 {
  18         int i;
  19         int namelen = ce_namelen(ce);
  20         for (i = 0; i < cnt; i++) {
  21                 int speclen = strlen(spec[i]);
  22                 if (! strncmp(spec[i], ce->name, speclen) &&
  23                     speclen <= namelen &&
  24                     (ce->name[speclen] == 0 ||
  25                      ce->name[speclen] == '/'))
  26                         return 1;
  27         }
  28         return 0;
  29 }
  30
  31 static void show_unmerge(const char *path)
  32 {
  33         if (generate_patch)
  34                 diff_unmerge(path);
  35         else
  36                 printf("U %s%c", path, line_termination);
  37 }
  38
  39 static void show_file(int pfx, struct cache_entry *ce)
  40 {
  41         if (generate_patch)
  42                 diff_addremove(pfx, ntohl(ce->ce_mode), ce->sha1,
  43                                ce->name, NULL);
  44         else
  45                 printf("%c%06o\t%s\t%s\t%s%c",
  46                        pfx, ntohl(ce->ce_mode), "blob",
  47                        sha1_to_hex(ce->sha1), ce->name, line_termination);
  48 }
  49
  50 static void show_modified(int oldmode, int mode,
  51                           const char *old_sha1, const char *sha1,
  52                           char *path)
  53 {
  54         char old_sha1_hex[41];
  55         strcpy(old_sha1_hex, sha1_to_hex(old_sha1));
  56
  57         if (generate_patch)
  58                 diff_change(oldmode, mode, old_sha1, sha1, path, NULL);
  59         else
  60                 printf("*%06o->%06o\tblob\t%s->%s\t%s%c",
  61                        oldmode, mode, old_sha1_hex, sha1_to_hex(sha1), path,
  62                        line_termination);
  63 }
  64
  65 int main(int argc, char **argv)
  66 {
  67         static const char null_sha1[20] = { 0, };
  68         int entries = read_cache();
  69         int i;
  70
  71         while (1 < argc && argv[1][0] == '-') {
  72                 if (!strcmp(argv[1], "-p"))
  73                         generate_patch = 1;
  74                 else if (!strcmp(argv[1], "-q"))
  75                         silent = 1;
  76                 else if (!strcmp(argv[1], "-r"))
  77                         ; /* no-op */
  78                 else if (!strcmp(argv[1], "-s"))
  79                         ; /* no-op */
  80                 else if (!strcmp(argv[1], "-z"))
  81                         line_termination = 0;
  82                 else
  83                         usage(show_diff_usage);
  84                 argv++; argc--;
  85         }
  86
  87         /* At this point, if argc == 1, then we are doing everything.
  88          * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
  89          */
  90         if (entries < 0) {
  91                 perror("read_cache");
  92                 exit(1);
  93         }
  94
  95         for (i = 0; i < entries; i++) {
  96                 struct stat st;
  97                 unsigned int oldmode, mode;
  98                 struct cache_entry *ce = active_cache[i];
  99                 int changed;
 100
 101                 if (1 < argc &&
 102                     ! matches_pathspec(ce, argv+1, argc-1))
 103                         continue;
 104
 105                 if (ce_stage(ce)) {
 106                         show_unmerge(ce->name);
 107                         while (i < entries &&
 108                                !strcmp(ce->name, active_cache[i]->name))
 109                                 i++;
 110                         i--; /* compensate for loop control increments */
 111                         continue;
 112                 }
 113
 114                 if (stat(ce->name, &st) < 0) {
 115                         if (errno != ENOENT) {
 116                                 perror(ce->name);
 117                                 continue;
 118                         }
 119                         if (silent)
 120                                 continue;
 121                         show_file('-', ce);
 122                         continue;
 123                 }
 124                 changed = cache_match_stat(ce, &st);
 125                 if (!changed)
 126                         continue;
 127
 128                 oldmode = ntohl(ce->ce_mode);
 129                 mode = S_IFREG | ce_permissions(st.st_mode);
 130
 131                 show_modified(oldmode, mode, ce->sha1, null_sha1,
 132                               ce->name);
 133         }
 134         return 0;
 135 }