diff-files.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 diff_files_usage[] =
  10 "git-diff-files [-q] [-0/-1/2/3] [<common diff options>] [<path>...]"
  11 COMMON_DIFF_OPTIONS_HELP;
  12
  13 static struct diff_options diff_options;
  14 static int silent = 0;
  15 static int diff_unmerged_stage = -1;
  16
  17 static void show_unmerge(const char *path)
  18 {
  19         diff_unmerge(&diff_options, path);
  20 }
  21
  22 static void show_file(int pfx, struct cache_entry *ce)
  23 {
  24         diff_addremove(&diff_options, pfx, ntohl(ce->ce_mode),
  25                        ce->sha1, ce->name, NULL);
  26 }
  27
  28 static void show_modified(int oldmode, int mode,
  29                           const unsigned char *old_sha1, const unsigned char *sha1,
  30                           char *path)
  31 {
  32         diff_change(&diff_options, oldmode, mode, old_sha1, sha1, path, NULL);
  33 }
  34
  35 int main(int argc, const char **argv)
  36 {
  37         const char **pathspec;
  38         const char *prefix = setup_git_directory();
  39         int entries, i;
  40
  41         git_config(git_diff_config);
  42         diff_setup(&diff_options);
  43         while (1 < argc && argv[1][0] == '-') {
  44                 if (!strcmp(argv[1], "--")) {
  45                         argv++;
  46                         argc--;
  47                         break;
  48                 }
  49                 if (!strcmp(argv[1], "-0"))
  50                         diff_unmerged_stage = 0;
  51                 else if (!strcmp(argv[1], "-1"))
  52                         diff_unmerged_stage = 1;
  53                 else if (!strcmp(argv[1], "-2"))
  54                         diff_unmerged_stage = 2;
  55                 else if (!strcmp(argv[1], "-3"))
  56                         diff_unmerged_stage = 3;
  57                 else if (!strcmp(argv[1], "--base"))
  58                         diff_unmerged_stage = 1;
  59                 else if (!strcmp(argv[1], "--ours"))
  60                         diff_unmerged_stage = 2;
  61                 else if (!strcmp(argv[1], "--theirs"))
  62                         diff_unmerged_stage = 3;
  63                 else if (!strcmp(argv[1], "-q"))
  64                         silent = 1;
  65                 else if (!strcmp(argv[1], "-r"))
  66                         ; /* no-op */
  67                 else if (!strcmp(argv[1], "-s"))
  68                         ; /* no-op */
  69                 else {
  70                         int diff_opt_cnt;
  71                         diff_opt_cnt = diff_opt_parse(&diff_options,
  72                                                       argv+1, argc-1);
  73                         if (diff_opt_cnt < 0)
  74                                 usage(diff_files_usage);
  75                         else if (diff_opt_cnt) {
  76                                 argv += diff_opt_cnt;
  77                                 argc -= diff_opt_cnt;
  78                                 continue;
  79                         }
  80                         else
  81                                 usage(diff_files_usage);
  82                 }
  83                 argv++; argc--;
  84         }
  85
  86         /* Find the directory, and set up the pathspec */
  87         pathspec = get_pathspec(prefix, argv + 1);
  88         entries = read_cache();
  89
  90         if (diff_unmerged_stage < 0) {
  91                 /* default to "ours" if unmerged index, otherwise 0 */
  92                 for (i = 0; i < entries; i++) {
  93                         struct cache_entry *ce = active_cache[i];
  94                         if (ce_stage(ce)) {
  95                                 diff_unmerged_stage = 2;
  96                                 break;
  97                         }
  98                 }
  99                 if (diff_unmerged_stage < 0)
 100                         diff_unmerged_stage = 0;
 101         }
 102
 103
 104         if (diff_setup_done(&diff_options) < 0)
 105                 usage(diff_files_usage);
 106
 107         /* At this point, if argc == 1, then we are doing everything.
 108          * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
 109          */
 110         if (entries < 0) {
 111                 perror("read_cache");
 112                 exit(1);
 113         }
 114
 115         for (i = 0; i < entries; i++) {
 116                 struct stat st;
 117                 unsigned int oldmode, newmode;
 118                 struct cache_entry *ce = active_cache[i];
 119                 int changed;
 120
 121                 if (!ce_path_match(ce, pathspec))
 122                         continue;
 123
 124                 if (ce_stage(ce)) {
 125                         if (!diff_unmerged_stage)
 126                                 show_unmerge(ce->name);
 127                         while (i < entries) {
 128                                 struct cache_entry *nce = active_cache[i];
 129
 130                                 if (strcmp(ce->name, nce->name))
 131                                         break;
 132                                 /* diff against the proper unmerged stage */
 133                                 if (ce_stage(nce) == diff_unmerged_stage)
 134                                         ce = nce;
 135                                 i++;
 136                         }
 137                         /*
 138                          * Compensate for loop update
 139                          */
 140                         i--;
 141                         /*
 142                          * Show the diff for the 'ce' if we found the one
 143                          * from the desired stage.
 144                          */
 145                         if (ce_stage(ce) != diff_unmerged_stage)
 146                                 continue;
 147                 }
 148                 else if (diff_unmerged_stage)
 149                         continue;
 150
 151                 if (lstat(ce->name, &st) < 0) {
 152                         if (errno != ENOENT && errno != ENOTDIR) {
 153                                 perror(ce->name);
 154                                 continue;
 155                         }
 156                         if (silent)
 157                                 continue;
 158                         show_file('-', ce);
 159                         continue;
 160                 }
 161                 changed = ce_match_stat(ce, &st);
 162                 if (!changed && !diff_options.find_copies_harder)
 163                         continue;
 164                 oldmode = ntohl(ce->ce_mode);
 165
 166                 newmode = DIFF_FILE_CANON_MODE(st.st_mode);
 167                 if (!trust_executable_bit &&
 168                     S_ISREG(newmode) && S_ISREG(oldmode) &&
 169                     ((newmode ^ oldmode) == 0111))
 170                         newmode = oldmode;
 171                 show_modified(oldmode, newmode,
 172                               ce->sha1, (changed ? null_sha1 : ce->sha1),
 173                               ce->name);
 174         }
 175         diffcore_std(&diff_options);
 176         diff_flush(&diff_options);
 177         return 0;
 178 }