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 [-p] [-q] [-r] [-z] [-R] [-B] [-M] [-C] [--find-copies-harder] [-O<orderfile>] [-S<string>] [--pickaxe-all] [<path>...]";
  11
  12 static int diff_output_format = DIFF_FORMAT_HUMAN;
  13 static int detect_rename = 0;
  14 static int find_copies_harder = 0;
  15 static int diff_setup_opt = 0;
  16 static int diff_score_opt = 0;
  17 static const char *pickaxe = NULL;
  18 static int pickaxe_opts = 0;
  19 static int diff_break_opt = -1;
  20 static const char *orderfile = NULL;
  21 static const char *diff_filter = NULL;
  22 static int silent = 0;
  23
  24 static void show_unmerge(const char *path)
  25 {
  26         diff_unmerge(path);
  27 }
  28
  29 static void show_file(int pfx, struct cache_entry *ce)
  30 {
  31         diff_addremove(pfx, ntohl(ce->ce_mode), ce->sha1, ce->name, NULL);
  32 }
  33
  34 static void show_modified(int oldmode, int mode,
  35                           const unsigned char *old_sha1, const unsigned char *sha1,
  36                           char *path)
  37 {
  38         diff_change(oldmode, mode, old_sha1, sha1, path, NULL);
  39 }
  40
  41 int main(int argc, const char **argv)
  42 {
  43         static const unsigned char null_sha1[20] = { 0, };
  44         int entries = read_cache();
  45         int i;
  46
  47         while (1 < argc && argv[1][0] == '-') {
  48                 if (!strcmp(argv[1], "-p") || !strcmp(argv[1], "-u"))
  49                         diff_output_format = DIFF_FORMAT_PATCH;
  50                 else if (!strcmp(argv[1], "-q"))
  51                         silent = 1;
  52                 else if (!strcmp(argv[1], "-r"))
  53                         ; /* no-op */
  54                 else if (!strcmp(argv[1], "-s"))
  55                         ; /* no-op */
  56                 else if (!strcmp(argv[1], "-z"))
  57                         diff_output_format = DIFF_FORMAT_MACHINE;
  58                 else if (!strcmp(argv[1], "-R"))
  59                         diff_setup_opt |= DIFF_SETUP_REVERSE;
  60                 else if (!strncmp(argv[1], "-S", 2))
  61                         pickaxe = argv[1] + 2;
  62                 else if (!strncmp(argv[1], "-O", 2))
  63                         orderfile = argv[1] + 2;
  64                 else if (!strncmp(argv[1], "--diff-filter=", 14))
  65                         diff_filter = argv[1] + 14;
  66                 else if (!strcmp(argv[1], "--pickaxe-all"))
  67                         pickaxe_opts = DIFF_PICKAXE_ALL;
  68                 else if (!strncmp(argv[1], "-B", 2)) {
  69                         if ((diff_break_opt =
  70                              diff_scoreopt_parse(argv[1])) == -1)
  71                                 usage(diff_files_usage);
  72                 }
  73                 else if (!strncmp(argv[1], "-M", 2)) {
  74                         if ((diff_score_opt =
  75                              diff_scoreopt_parse(argv[1])) == -1)
  76                                 usage(diff_files_usage);
  77                         detect_rename = DIFF_DETECT_RENAME;
  78                 }
  79                 else if (!strncmp(argv[1], "-C", 2)) {
  80                         if ((diff_score_opt =
  81                              diff_scoreopt_parse(argv[1])) == -1)
  82                                 usage(diff_files_usage);
  83                         detect_rename = DIFF_DETECT_COPY;
  84                 }
  85                 else if (!strcmp(argv[1], "--find-copies-harder"))
  86                         find_copies_harder = 1;
  87                 else
  88                         usage(diff_files_usage);
  89                 argv++; argc--;
  90         }
  91
  92         if (find_copies_harder && detect_rename != DIFF_DETECT_COPY)
  93                 usage(diff_files_usage);
  94
  95         /* At this point, if argc == 1, then we are doing everything.
  96          * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
  97          */
  98         if (entries < 0) {
  99                 perror("read_cache");
 100                 exit(1);
 101         }
 102
 103         diff_setup(diff_setup_opt);
 104
 105         for (i = 0; i < entries; i++) {
 106                 struct stat st;
 107                 unsigned int oldmode;
 108                 struct cache_entry *ce = active_cache[i];
 109                 int changed;
 110
 111                 if (ce_stage(ce)) {
 112                         show_unmerge(ce->name);
 113                         while (i < entries &&
 114                                !strcmp(ce->name, active_cache[i]->name))
 115                                 i++;
 116                         i--; /* compensate for loop control increments */
 117                         continue;
 118                 }
 119
 120                 if (lstat(ce->name, &st) < 0) {
 121                         if (errno != ENOENT && errno != ENOTDIR) {
 122                                 perror(ce->name);
 123                                 continue;
 124                         }
 125                         if (silent)
 126                                 continue;
 127                         show_file('-', ce);
 128                         continue;
 129                 }
 130                 changed = ce_match_stat(ce, &st);
 131                 if (!changed && !find_copies_harder)
 132                         continue;
 133                 oldmode = ntohl(ce->ce_mode);
 134                 show_modified(oldmode, DIFF_FILE_CANON_MODE(st.st_mode),
 135                               ce->sha1, (changed ? null_sha1 : ce->sha1),
 136                               ce->name);
 137         }
 138         diffcore_std((1 < argc) ? argv + 1 : NULL,
 139                      detect_rename, diff_score_opt,
 140                      pickaxe, pickaxe_opts,
 141                      diff_break_opt,
 142                      orderfile, diff_filter);
 143         diff_flush(diff_output_format);
 144         return 0;
 145 }