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