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 int diff_output_format = DIFF_FORMAT_HUMAN;
  15 static int detect_rename = 0;
  16 static int find_copies_harder = 0;
  17 static int diff_setup_opt = 0;
  18 static int diff_score_opt = 0;
  19 static const char *pickaxe = NULL;
  20 static int pickaxe_opts = 0;
  21 static int diff_break_opt = -1;
  22 static const char *orderfile = NULL;
  23 static const char *diff_filter = NULL;
  24 static int silent = 0;
  25
  26 static void show_unmerge(const char *path)
  27 {
  28         diff_unmerge(path);
  29 }
  30
  31 static void show_file(int pfx, struct cache_entry *ce)
  32 {
  33         diff_addremove(pfx, ntohl(ce->ce_mode), ce->sha1, ce->name, NULL);
  34 }
  35
  36 static void show_modified(int oldmode, int mode,
  37                           const unsigned char *old_sha1, const unsigned char *sha1,
  38                           char *path)
  39 {
  40         diff_change(oldmode, mode, old_sha1, sha1, path, NULL);
  41 }
  42
  43 int main(int argc, const char **argv)
  44 {
  45         static const unsigned char null_sha1[20] = { 0, };
  46         const char **pathspec;
  47         int entries = read_cache();
  48         int i;
  49
  50         while (1 < argc && argv[1][0] == '-') {
  51                 if (!strcmp(argv[1], "-p") || !strcmp(argv[1], "-u"))
  52                         diff_output_format = DIFF_FORMAT_PATCH;
  53                 else if (!strcmp(argv[1], "-q"))
  54                         silent = 1;
  55                 else if (!strcmp(argv[1], "-r"))
  56                         ; /* no-op */
  57                 else if (!strcmp(argv[1], "-s"))
  58                         ; /* no-op */
  59                 else if (!strcmp(argv[1], "-z"))
  60                         diff_output_format = DIFF_FORMAT_MACHINE;
  61                 else if (!strcmp(argv[1], "--name-only"))
  62                         diff_output_format = DIFF_FORMAT_NAME;
  63                 else if (!strcmp(argv[1], "--name-only-z"))
  64                         diff_output_format = DIFF_FORMAT_NAME_Z;
  65                 else if (!strcmp(argv[1], "-R"))
  66                         diff_setup_opt |= DIFF_SETUP_REVERSE;
  67                 else if (!strncmp(argv[1], "-S", 2))
  68                         pickaxe = argv[1] + 2;
  69                 else if (!strncmp(argv[1], "-O", 2))
  70                         orderfile = argv[1] + 2;
  71                 else if (!strncmp(argv[1], "--diff-filter=", 14))
  72                         diff_filter = argv[1] + 14;
  73                 else if (!strcmp(argv[1], "--pickaxe-all"))
  74                         pickaxe_opts = DIFF_PICKAXE_ALL;
  75                 else if (!strncmp(argv[1], "-B", 2)) {
  76                         if ((diff_break_opt =
  77                              diff_scoreopt_parse(argv[1])) == -1)
  78                                 usage(diff_files_usage);
  79                 }
  80                 else if (!strncmp(argv[1], "-M", 2)) {
  81                         if ((diff_score_opt =
  82                              diff_scoreopt_parse(argv[1])) == -1)
  83                                 usage(diff_files_usage);
  84                         detect_rename = DIFF_DETECT_RENAME;
  85                 }
  86                 else if (!strncmp(argv[1], "-C", 2)) {
  87                         if ((diff_score_opt =
  88                              diff_scoreopt_parse(argv[1])) == -1)
  89                                 usage(diff_files_usage);
  90                         detect_rename = DIFF_DETECT_COPY;
  91                 }
  92                 else if (!strcmp(argv[1], "--find-copies-harder"))
  93                         find_copies_harder = 1;
  94                 else
  95                         usage(diff_files_usage);
  96                 argv++; argc--;
  97         }
  98
  99         /* Do we have a pathspec? */
 100         pathspec = (argc > 1) ? argv + 1 : NULL;
 101
 102         if (find_copies_harder && detect_rename != DIFF_DETECT_COPY)
 103                 usage(diff_files_usage);
 104
 105         /* At this point, if argc == 1, then we are doing everything.
 106          * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
 107          */
 108         if (entries < 0) {
 109                 perror("read_cache");
 110                 exit(1);
 111         }
 112
 113         diff_setup(diff_setup_opt);
 114
 115         for (i = 0; i < entries; i++) {
 116                 struct stat st;
 117                 unsigned int oldmode;
 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                         show_unmerge(ce->name);
 126                         while (i < entries &&
 127                                !strcmp(ce->name, active_cache[i]->name))
 128                                 i++;
 129                         i--; /* compensate for loop control increments */
 130                         continue;
 131                 }
 132
 133                 if (lstat(ce->name, &st) < 0) {
 134                         if (errno != ENOENT && errno != ENOTDIR) {
 135                                 perror(ce->name);
 136                                 continue;
 137                         }
 138                         if (silent)
 139                                 continue;
 140                         show_file('-', ce);
 141                         continue;
 142                 }
 143                 changed = ce_match_stat(ce, &st);
 144                 if (!changed && !find_copies_harder)
 145                         continue;
 146                 oldmode = ntohl(ce->ce_mode);
 147                 show_modified(oldmode, DIFF_FILE_CANON_MODE(st.st_mode),
 148                               ce->sha1, (changed ? null_sha1 : ce->sha1),
 149                               ce->name);
 150         }
 151         diffcore_std(pathspec,
 152                      detect_rename, diff_score_opt,
 153                      pickaxe, pickaxe_opts,
 154                      diff_break_opt,
 155                      orderfile, diff_filter);
 156         diff_flush(diff_output_format);
 157         return 0;
 158 }