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] "
  11 "[<common diff options>] [<path>...]"
  12 COMMON_DIFF_OPTIONS_HELP;
  13
  14 static struct diff_options diff_options;
  15 static int silent = 0;
  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_default_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], "-q"))
  50                         silent = 1;
  51                 else if (!strcmp(argv[1], "-r"))
  52                         ; /* no-op */
  53                 else if (!strcmp(argv[1], "-s"))
  54                         ; /* no-op */
  55                 else {
  56                         int diff_opt_cnt;
  57                         diff_opt_cnt = diff_opt_parse(&diff_options,
  58                                                       argv+1, argc-1);
  59                         if (diff_opt_cnt < 0)
  60                                 usage(diff_files_usage);
  61                         else if (diff_opt_cnt) {
  62                                 argv += diff_opt_cnt;
  63                                 argc -= diff_opt_cnt;
  64                                 continue;
  65                         }
  66                         else
  67                                 usage(diff_files_usage);
  68                 }
  69                 argv++; argc--;
  70         }
  71
  72         /* Find the directory, and set up the pathspec */
  73         pathspec = get_pathspec(prefix, argv + 1);
  74         entries = read_cache();
  75
  76         if (diff_setup_done(&diff_options) < 0)
  77                 usage(diff_files_usage);
  78
  79         /* At this point, if argc == 1, then we are doing everything.
  80          * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
  81          */
  82         if (entries < 0) {
  83                 perror("read_cache");
  84                 exit(1);
  85         }
  86
  87         for (i = 0; i < entries; i++) {
  88                 struct stat st;
  89                 unsigned int oldmode, newmode;
  90                 struct cache_entry *ce = active_cache[i];
  91                 int changed;
  92
  93                 if (!ce_path_match(ce, pathspec))
  94                         continue;
  95
  96                 if (ce_stage(ce)) {
  97                         show_unmerge(ce->name);
  98                         while (i < entries &&
  99                                !strcmp(ce->name, active_cache[i]->name))
 100                                 i++;
 101                         i--; /* compensate for loop control increments */
 102                         continue;
 103                 }
 104
 105                 if (lstat(ce->name, &st) < 0) {
 106                         if (errno != ENOENT && errno != ENOTDIR) {
 107                                 perror(ce->name);
 108                                 continue;
 109                         }
 110                         if (silent)
 111                                 continue;
 112                         show_file('-', ce);
 113                         continue;
 114                 }
 115                 changed = ce_match_stat(ce, &st);
 116                 if (!changed && !diff_options.find_copies_harder)
 117                         continue;
 118                 oldmode = ntohl(ce->ce_mode);
 119
 120                 newmode = DIFF_FILE_CANON_MODE(st.st_mode);
 121                 if (!trust_executable_bit &&
 122                     S_ISREG(newmode) && S_ISREG(oldmode) &&
 123                     ((newmode ^ oldmode) == 0111))
 124                         newmode = oldmode;
 125                 show_modified(oldmode, newmode,
 126                               ce->sha1, (changed ? null_sha1 : ce->sha1),
 127                               ce->name);
 128         }
 129         diffcore_std(&diff_options);
 130         diff_flush(&diff_options);
 131         return 0;
 132 }