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_RAW;
  15 static int diff_line_termination = '\n';
  16 static int detect_rename = 0;
  17 static int find_copies_harder = 0;
  18 static int diff_setup_opt = 0;
  19 static int diff_score_opt = 0;
  20 static const char *pickaxe = NULL;
  21 static int pickaxe_opts = 0;
  22 static int diff_break_opt = -1;
  23 static const char *orderfile = NULL;
  24 static const char *diff_filter = NULL;
  25 static int silent = 0;
  26
  27 static void show_unmerge(const char *path)
  28 {
  29         diff_unmerge(path);
  30 }
  31
  32 static void show_file(int pfx, struct cache_entry *ce)
  33 {
  34         diff_addremove(pfx, ntohl(ce->ce_mode), ce->sha1, ce->name, NULL);
  35 }
  36
  37 static void show_modified(int oldmode, int mode,
  38                           const unsigned char *old_sha1, const unsigned char *sha1,
  39                           char *path)
  40 {
  41         diff_change(oldmode, mode, old_sha1, sha1, path, NULL);
  42 }
  43
  44 int main(int argc, const char **argv)
  45 {
  46         static const unsigned char null_sha1[20] = { 0, };
  47         const char **pathspec;
  48         int entries = read_cache();
  49         int i;
  50
  51         while (1 < argc && argv[1][0] == '-') {
  52                 if (!strcmp(argv[1], "-p") || !strcmp(argv[1], "-u"))
  53                         diff_output_format = DIFF_FORMAT_PATCH;
  54                 else if (!strcmp(argv[1], "-q"))
  55                         silent = 1;
  56                 else if (!strcmp(argv[1], "-r"))
  57                         ; /* no-op */
  58                 else if (!strcmp(argv[1], "-s"))
  59                         ; /* no-op */
  60                 else if (!strcmp(argv[1], "-z"))
  61                         diff_line_termination = 0;
  62                 else if (!strcmp(argv[1], "--name-only"))
  63                         diff_output_format = DIFF_FORMAT_NAME;
  64                 else if (!strcmp(argv[1], "-R"))
  65                         diff_setup_opt |= DIFF_SETUP_REVERSE;
  66                 else if (!strncmp(argv[1], "-S", 2))
  67                         pickaxe = argv[1] + 2;
  68                 else if (!strncmp(argv[1], "-O", 2))
  69                         orderfile = argv[1] + 2;
  70                 else if (!strncmp(argv[1], "--diff-filter=", 14))
  71                         diff_filter = argv[1] + 14;
  72                 else if (!strcmp(argv[1], "--pickaxe-all"))
  73                         pickaxe_opts = DIFF_PICKAXE_ALL;
  74                 else if (!strncmp(argv[1], "-B", 2)) {
  75                         if ((diff_break_opt =
  76                              diff_scoreopt_parse(argv[1])) == -1)
  77                                 usage(diff_files_usage);
  78                 }
  79                 else if (!strncmp(argv[1], "-M", 2)) {
  80                         if ((diff_score_opt =
  81                              diff_scoreopt_parse(argv[1])) == -1)
  82                                 usage(diff_files_usage);
  83                         detect_rename = DIFF_DETECT_RENAME;
  84                 }
  85                 else if (!strncmp(argv[1], "-C", 2)) {
  86                         if ((diff_score_opt =
  87                              diff_scoreopt_parse(argv[1])) == -1)
  88                                 usage(diff_files_usage);
  89                         detect_rename = DIFF_DETECT_COPY;
  90                 }
  91                 else if (!strcmp(argv[1], "--find-copies-harder"))
  92                         find_copies_harder = 1;
  93                 else
  94                         usage(diff_files_usage);
  95                 argv++; argc--;
  96         }
  97
  98         /* Do we have a pathspec? */
  99         pathspec = (argc > 1) ? argv + 1 : NULL;
 100
 101         if (find_copies_harder && detect_rename != DIFF_DETECT_COPY)
 102                 usage(diff_files_usage);
 103
 104         /* At this point, if argc == 1, then we are doing everything.
 105          * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
 106          */
 107         if (entries < 0) {
 108                 perror("read_cache");
 109                 exit(1);
 110         }
 111
 112         diff_setup(diff_setup_opt);
 113
 114         for (i = 0; i < entries; i++) {
 115                 struct stat st;
 116                 unsigned int oldmode;
 117                 struct cache_entry *ce = active_cache[i];
 118                 int changed;
 119
 120                 if (!ce_path_match(ce, pathspec))
 121                         continue;
 122
 123                 if (ce_stage(ce)) {
 124                         show_unmerge(ce->name);
 125                         while (i < entries &&
 126                                !strcmp(ce->name, active_cache[i]->name))
 127                                 i++;
 128                         i--; /* compensate for loop control increments */
 129                         continue;
 130                 }
 131
 132                 if (lstat(ce->name, &st) < 0) {
 133                         if (errno != ENOENT && errno != ENOTDIR) {
 134                                 perror(ce->name);
 135                                 continue;
 136                         }
 137                         if (silent)
 138                                 continue;
 139                         show_file('-', ce);
 140                         continue;
 141                 }
 142                 changed = ce_match_stat(ce, &st);
 143                 if (!changed && !find_copies_harder)
 144                         continue;
 145                 oldmode = ntohl(ce->ce_mode);
 146                 show_modified(oldmode, DIFF_FILE_CANON_MODE(st.st_mode),
 147                               ce->sha1, (changed ? null_sha1 : ce->sha1),
 148                               ce->name);
 149         }
 150         diffcore_std(pathspec,
 151                      detect_rename, diff_score_opt,
 152                      pickaxe, pickaxe_opts,
 153                      diff_break_opt,
 154                      orderfile, diff_filter);
 155         diff_flush(diff_output_format, diff_line_termination);
 156         return 0;
 157 }