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