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 "config.h"
   8 #include "diff.h"
   9 #include "commit.h"
  10 #include "revision.h"
  11 #include "builtin.h"
  12 #include "submodule.h"
  13
  14 static const char diff_files_usage[] =
  15 "git diff-files [-q] [-0 | -1 | -2 | -3 | -c | --cc] [<common-diff-options>] [<path>...]"
  16 COMMON_DIFF_OPTIONS_HELP;
  17
  18 int cmd_diff_files(int argc, const char **argv, const char *prefix)
  19 {
  20         struct rev_info rev;
  21         int result;
  22         unsigned options = 0;
  23
  24         if (argc == 2 && !strcmp(argv[1], "-h"))
  25                 usage(diff_files_usage);
  26
  27         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
  28         init_revisions(&rev, prefix);
  29         rev.abbrev = 0;
  30         precompose_argv(argc, argv);
  31
  32         argc = setup_revisions(argc, argv, &rev, NULL);
  33         while (1 < argc && argv[1][0] == '-') {
  34                 if (!strcmp(argv[1], "--base"))
  35                         rev.max_count = 1;
  36                 else if (!strcmp(argv[1], "--ours"))
  37                         rev.max_count = 2;
  38                 else if (!strcmp(argv[1], "--theirs"))
  39                         rev.max_count = 3;
  40                 else if (!strcmp(argv[1], "-q"))
  41                         options |= DIFF_SILENT_ON_REMOVED;
  42                 else
  43                         usage(diff_files_usage);
  44                 argv++; argc--;
  45         }
  46         if (!rev.diffopt.output_format)
  47                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  48
  49         /*
  50          * Make sure there are NO revision (i.e. pending object) parameter,
  51          * rev.max_count is reasonable (0 <= n <= 3), and
  52          * there is no other revision filtering parameters.
  53          */
  54         if (rev.pending.nr ||
  55             rev.min_age != -1 || rev.max_age != -1 ||
  56             3 < rev.max_count)
  57                 usage(diff_files_usage);
  58
  59         /*
  60          * "diff-files --base -p" should not combine merges because it
  61          * was not asked to.  "diff-files -c -p" should not densify
  62          * (the user should ask with "diff-files --cc" explicitly).
  63          */
  64         if (rev.max_count == -1 && !rev.combine_merges &&
  65             (rev.diffopt.output_format & DIFF_FORMAT_PATCH))
  66                 rev.combine_merges = rev.dense_combined_merges = 1;
  67
  68         if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
  69                 perror("read_cache_preload");
  70                 return -1;
  71         }
  72         result = run_diff_files(&rev, options);
  73         return diff_result_code(&rev.diffopt, result);
  74 }