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 #include "commit.h"
   9 #include "revision.h"
  10
  11 static const char diff_files_usage[] =
  12 "git-diff-files [-q] [-0/-1/2/3 |-c|--cc] [<common diff options>] [<path>...]"
  13 COMMON_DIFF_OPTIONS_HELP;
  14
  15 static struct rev_info rev;
  16 static int silent = 0;
  17 static int diff_unmerged_stage = 2;
  18 static int combine_merges = 0;
  19 static int dense_combined_merges = 0;
  20
  21 static void show_unmerge(const char *path)
  22 {
  23         diff_unmerge(&rev.diffopt, path);
  24 }
  25
  26 static void show_file(int pfx, struct cache_entry *ce)
  27 {
  28         diff_addremove(&rev.diffopt, pfx, ntohl(ce->ce_mode),
  29                        ce->sha1, ce->name, NULL);
  30 }
  31
  32 static void show_modified(int oldmode, int mode,
  33                           const unsigned char *old_sha1, const unsigned char *sha1,
  34                           char *path)
  35 {
  36         diff_change(&rev.diffopt, oldmode, mode, old_sha1, sha1, path, NULL);
  37 }
  38
  39 int main(int argc, const char **argv)
  40 {
  41         const char **pathspec;
  42         const char *prefix = setup_git_directory();
  43         int entries, i;
  44
  45         git_config(git_diff_config);
  46         diff_setup(&rev.diffopt);
  47         while (1 < argc && argv[1][0] == '-') {
  48                 if (!strcmp(argv[1], "--")) {
  49                         argv++;
  50                         argc--;
  51                         break;
  52                 }
  53                 if (!strcmp(argv[1], "-0"))
  54                         diff_unmerged_stage = 0;
  55                 else if (!strcmp(argv[1], "-1"))
  56                         diff_unmerged_stage = 1;
  57                 else if (!strcmp(argv[1], "-2"))
  58                         diff_unmerged_stage = 2;
  59                 else if (!strcmp(argv[1], "-3"))
  60                         diff_unmerged_stage = 3;
  61                 else if (!strcmp(argv[1], "--base"))
  62                         diff_unmerged_stage = 1;
  63                 else if (!strcmp(argv[1], "--ours"))
  64                         diff_unmerged_stage = 2;
  65                 else if (!strcmp(argv[1], "--theirs"))
  66                         diff_unmerged_stage = 3;
  67                 else if (!strcmp(argv[1], "-q"))
  68                         silent = 1;
  69                 else if (!strcmp(argv[1], "-r"))
  70                         ; /* no-op */
  71                 else if (!strcmp(argv[1], "-s"))
  72                         ; /* no-op */
  73                 else if (!strcmp(argv[1], "-c"))
  74                         combine_merges = 1;
  75                 else if (!strcmp(argv[1], "--cc"))
  76                         dense_combined_merges = combine_merges = 1;
  77                 else {
  78                         int diff_opt_cnt;
  79                         diff_opt_cnt = diff_opt_parse(&rev.diffopt,
  80                                                       argv+1, argc-1);
  81                         if (diff_opt_cnt < 0)
  82                                 usage(diff_files_usage);
  83                         else if (diff_opt_cnt) {
  84                                 argv += diff_opt_cnt;
  85                                 argc -= diff_opt_cnt;
  86                                 continue;
  87                         }
  88                         else
  89                                 usage(diff_files_usage);
  90                 }
  91                 argv++; argc--;
  92         }
  93         if (dense_combined_merges)
  94                 rev.diffopt.output_format = DIFF_FORMAT_PATCH;
  95
  96         /* Find the directory, and set up the pathspec */
  97         pathspec = get_pathspec(prefix, argv + 1);
  98         entries = read_cache();
  99
 100         if (diff_setup_done(&rev.diffopt) < 0)
 101                 usage(diff_files_usage);
 102
 103         /* At this point, if argc == 1, then we are doing everything.
 104          * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
 105          */
 106         if (entries < 0) {
 107                 perror("read_cache");
 108                 exit(1);
 109         }
 110
 111         for (i = 0; i < entries; i++) {
 112                 struct stat st;
 113                 unsigned int oldmode, newmode;
 114                 struct cache_entry *ce = active_cache[i];
 115                 int changed;
 116
 117                 if (!ce_path_match(ce, pathspec))
 118                         continue;
 119
 120                 if (ce_stage(ce)) {
 121                         struct {
 122                                 struct combine_diff_path p;
 123                                 struct combine_diff_parent filler[5];
 124                         } combine;
 125                         int num_compare_stages = 0;
 126
 127                         combine.p.next = NULL;
 128                         combine.p.len = ce_namelen(ce);
 129                         combine.p.path = xmalloc(combine.p.len + 1);
 130                         memcpy(combine.p.path, ce->name, combine.p.len);
 131                         combine.p.path[combine.p.len] = 0;
 132                         combine.p.mode = 0;
 133                         memset(combine.p.sha1, 0, 20);
 134                         memset(&combine.p.parent[0], 0,
 135                                sizeof(combine.filler));
 136
 137                         while (i < entries) {
 138                                 struct cache_entry *nce = active_cache[i];
 139                                 int stage;
 140
 141                                 if (strcmp(ce->name, nce->name))
 142                                         break;
 143
 144                                 /* Stage #2 (ours) is the first parent,
 145                                  * stage #3 (theirs) is the second.
 146                                  */
 147                                 stage = ce_stage(nce);
 148                                 if (2 <= stage) {
 149                                         int mode = ntohl(nce->ce_mode);
 150                                         num_compare_stages++;
 151                                         memcpy(combine.p.parent[stage-2].sha1,
 152                                                nce->sha1, 20);
 153                                         combine.p.parent[stage-2].mode =
 154                                                 canon_mode(mode);
 155                                         combine.p.parent[stage-2].status =
 156                                                 DIFF_STATUS_MODIFIED;
 157                                 }
 158
 159                                 /* diff against the proper unmerged stage */
 160                                 if (stage == diff_unmerged_stage)
 161                                         ce = nce;
 162                                 i++;
 163                         }
 164                         /*
 165                          * Compensate for loop update
 166                          */
 167                         i--;
 168
 169                         if (combine_merges && num_compare_stages == 2) {
 170                                 show_combined_diff(&combine.p, 2,
 171                                                    dense_combined_merges,
 172                                                    &rev);
 173                                 free(combine.p.path);
 174                                 continue;
 175                         }
 176                         free(combine.p.path);
 177
 178                         /*
 179                          * Show the diff for the 'ce' if we found the one
 180                          * from the desired stage.
 181                          */
 182                         show_unmerge(ce->name);
 183                         if (ce_stage(ce) != diff_unmerged_stage)
 184                                 continue;
 185                 }
 186
 187                 if (lstat(ce->name, &st) < 0) {
 188                         if (errno != ENOENT && errno != ENOTDIR) {
 189                                 perror(ce->name);
 190                                 continue;
 191                         }
 192                         if (silent)
 193                                 continue;
 194                         show_file('-', ce);
 195                         continue;
 196                 }
 197                 changed = ce_match_stat(ce, &st, 0);
 198                 if (!changed && !rev.diffopt.find_copies_harder)
 199                         continue;
 200                 oldmode = ntohl(ce->ce_mode);
 201
 202                 newmode = canon_mode(st.st_mode);
 203                 if (!trust_executable_bit &&
 204                     S_ISREG(newmode) && S_ISREG(oldmode) &&
 205                     ((newmode ^ oldmode) == 0111))
 206                         newmode = oldmode;
 207                 show_modified(oldmode, newmode,
 208                               ce->sha1, (changed ? null_sha1 : ce->sha1),
 209                               ce->name);
 210         }
 211         diffcore_std(&rev.diffopt);
 212         diff_flush(&rev.diffopt);
 213         return 0;
 214 }