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