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