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