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 |-c|--cc] [<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 = 2;
  16 static int combine_merges = 0;
  17 static int dense_combined_merges = 0;
  18
  19 static void show_unmerge(const char *path)
  20 {
  21         diff_unmerge(&diff_options, path);
  22 }
  23
  24 static void show_file(int pfx, struct cache_entry *ce)
  25 {
  26         diff_addremove(&diff_options, pfx, ntohl(ce->ce_mode),
  27                        ce->sha1, ce->name, NULL);
  28 }
  29
  30 static void show_modified(int oldmode, int mode,
  31                           const unsigned char *old_sha1, const unsigned char *sha1,
  32                           char *path)
  33 {
  34         diff_change(&diff_options, oldmode, mode, old_sha1, sha1, path, NULL);
  35 }
  36
  37 int main(int argc, const char **argv)
  38 {
  39         const char **pathspec;
  40         const char *prefix = setup_git_directory();
  41         int entries, i;
  42
  43         git_config(git_diff_config);
  44         diff_setup(&diff_options);
  45         while (1 < argc && argv[1][0] == '-') {
  46                 if (!strcmp(argv[1], "--")) {
  47                         argv++;
  48                         argc--;
  49                         break;
  50                 }
  51                 if (!strcmp(argv[1], "-0"))
  52                         diff_unmerged_stage = 0;
  53                 else if (!strcmp(argv[1], "-1"))
  54                         diff_unmerged_stage = 1;
  55                 else if (!strcmp(argv[1], "-2"))
  56                         diff_unmerged_stage = 2;
  57                 else if (!strcmp(argv[1], "-3"))
  58                         diff_unmerged_stage = 3;
  59                 else if (!strcmp(argv[1], "--base"))
  60                         diff_unmerged_stage = 1;
  61                 else if (!strcmp(argv[1], "--ours"))
  62                         diff_unmerged_stage = 2;
  63                 else if (!strcmp(argv[1], "--theirs"))
  64                         diff_unmerged_stage = 3;
  65                 else if (!strcmp(argv[1], "-q"))
  66                         silent = 1;
  67                 else if (!strcmp(argv[1], "-r"))
  68                         ; /* no-op */
  69                 else if (!strcmp(argv[1], "-s"))
  70                         ; /* no-op */
  71                 else if (!strcmp(argv[1], "-c"))
  72                         combine_merges = 1;
  73                 else if (!strcmp(argv[1], "--cc"))
  74                         dense_combined_merges = combine_merges = 1;
  75                 else {
  76                         int diff_opt_cnt;
  77                         diff_opt_cnt = diff_opt_parse(&diff_options,
  78                                                       argv+1, argc-1);
  79                         if (diff_opt_cnt < 0)
  80                                 usage(diff_files_usage);
  81                         else if (diff_opt_cnt) {
  82                                 argv += diff_opt_cnt;
  83                                 argc -= diff_opt_cnt;
  84                                 continue;
  85                         }
  86                         else
  87                                 usage(diff_files_usage);
  88                 }
  89                 argv++; argc--;
  90         }
  91         if (combine_merges) {
  92                 diff_options.output_format = DIFF_FORMAT_PATCH;
  93         }
  94
  95         /* Find the directory, and set up the pathspec */
  96         pathspec = get_pathspec(prefix, argv + 1);
  97         entries = read_cache();
  98
  99         if (diff_setup_done(&diff_options) < 0)
 100                 usage(diff_files_usage);
 101
 102         /* At this point, if argc == 1, then we are doing everything.
 103          * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
 104          */
 105         if (entries < 0) {
 106                 perror("read_cache");
 107                 exit(1);
 108         }
 109
 110         for (i = 0; i < entries; i++) {
 111                 struct stat st;
 112                 unsigned int oldmode, newmode;
 113                 struct cache_entry *ce = active_cache[i];
 114                 int changed;
 115
 116                 if (!ce_path_match(ce, pathspec))
 117                         continue;
 118
 119                 if (ce_stage(ce)) {
 120                         struct {
 121                                 struct combine_diff_path p;
 122                                 struct combine_diff_parent filler[5];
 123                         } combine;
 124                         int num_compare_stages = 0;
 125
 126                         combine.p.next = NULL;
 127                         combine.p.len = ce_namelen(ce);
 128                         combine.p.path = xmalloc(combine.p.len + 1);
 129                         memcpy(combine.p.path, ce->name, combine.p.len);
 130                         combine.p.path[combine.p.len] = 0;
 131                         combine.p.mode = 0;
 132                         memset(combine.p.sha1, 0, 20);
 133                         memset(&combine.p.parent[0], 0,
 134                                sizeof(combine.filler));
 135
 136                         while (i < entries) {
 137                                 struct cache_entry *nce = active_cache[i];
 138                                 int stage;
 139
 140                                 if (strcmp(ce->name, nce->name))
 141                                         break;
 142
 143                                 /* Stage #2 (ours) is the first parent,
 144                                  * stage #3 (theirs) is the second.
 145                                  */
 146                                 stage = ce_stage(nce);
 147                                 if (2 <= stage) {
 148                                         int mode = ntohl(nce->ce_mode);
 149                                         num_compare_stages++;
 150                                         memcpy(combine.p.parent[stage-2].sha1,
 151                                                nce->sha1, 20);
 152                                         combine.p.parent[stage-2].mode =
 153                                                 DIFF_FILE_CANON_MODE(mode);
 154                                 }
 155
 156                                 /* diff against the proper unmerged stage */
 157                                 if (stage == diff_unmerged_stage)
 158                                         ce = nce;
 159                                 i++;
 160                         }
 161                         /*
 162                          * Compensate for loop update
 163                          */
 164                         i--;
 165
 166                         if (combine_merges && num_compare_stages == 2) {
 167                                 show_combined_diff(&combine.p, 2,
 168                                                    dense_combined_merges,
 169                                                    NULL);
 170                                 free(combine.p.path);
 171                                 continue;
 172                         }
 173                         free(combine.p.path);
 174
 175                         /*
 176                          * Show the diff for the 'ce' if we found the one
 177                          * from the desired stage.
 178                          */
 179                         show_unmerge(ce->name);
 180                         if (ce_stage(ce) != diff_unmerged_stage)
 181                                 continue;
 182                 }
 183
 184                 if (lstat(ce->name, &st) < 0) {
 185                         if (errno != ENOENT && errno != ENOTDIR) {
 186                                 perror(ce->name);
 187                                 continue;
 188                         }
 189                         if (silent)
 190                                 continue;
 191                         show_file('-', ce);
 192                         continue;
 193                 }
 194                 changed = ce_match_stat(ce, &st);
 195                 if (!changed && !diff_options.find_copies_harder)
 196                         continue;
 197                 oldmode = ntohl(ce->ce_mode);
 198
 199                 newmode = DIFF_FILE_CANON_MODE(st.st_mode);
 200                 if (!trust_executable_bit &&
 201                     S_ISREG(newmode) && S_ISREG(oldmode) &&
 202                     ((newmode ^ oldmode) == 0111))
 203                         newmode = oldmode;
 204                 show_modified(oldmode, newmode,
 205                               ce->sha1, (changed ? null_sha1 : ce->sha1),
 206                               ce->name);
 207         }
 208         diffcore_std(&diff_options);
 209         diff_flush(&diff_options);
 210         return 0;
 211 }