builtin-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 #include "commit.h"
   9 #include "revision.h"
  10 #include "builtin.h"
  11
  12 static const char diff_files_usage[] =
  13 "git-diff-files [-q] [-0/-1/2/3 |-c|--cc] [<common diff options>] [<path>...]"
  14 COMMON_DIFF_OPTIONS_HELP;
  15
  16 int cmd_diff_files(int argc, const char **argv, const char *prefix)
  17 {
  18         struct rev_info rev;
  19         int result;
  20         unsigned options = 0;
  21
  22         init_revisions(&rev, prefix);
  23         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
  24         rev.abbrev = 0;
  25
  26         argc = setup_revisions(argc, argv, &rev, NULL);
  27         while (1 < argc && argv[1][0] == '-') {
  28                 if (!strcmp(argv[1], "--base"))
  29                         rev.max_count = 1;
  30                 else if (!strcmp(argv[1], "--ours"))
  31                         rev.max_count = 2;
  32                 else if (!strcmp(argv[1], "--theirs"))
  33                         rev.max_count = 3;
  34                 else if (!strcmp(argv[1], "-q"))
  35                         options |= DIFF_SILENT_ON_REMOVED;
  36                 else
  37                         usage(diff_files_usage);
  38                 argv++; argc--;
  39         }
  40         if (!rev.diffopt.output_format)
  41                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  42
  43         /*
  44          * Make sure there are NO revision (i.e. pending object) parameter,
  45          * rev.max_count is reasonable (0 <= n <= 3), and
  46          * there is no other revision filtering parameters.
  47          */
  48         if (rev.pending.nr ||
  49             rev.min_age != -1 || rev.max_age != -1 ||
  50             3 < rev.max_count)
  51                 usage(diff_files_usage);
  52
  53         if (rev.max_count == -1 &&
  54             (rev.diffopt.output_format & DIFF_FORMAT_PATCH))
  55                 rev.combine_merges = rev.dense_combined_merges = 1;
  56
  57         if (read_cache() < 0) {
  58                 perror("read_cache");
  59                 return -1;
  60         }
  61         result = run_diff_files(&rev, options);
  62         return diff_result_code(&rev.diffopt, result);
  63 }