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, char **envp)
  17 {
  18         struct rev_info rev;
  19         int silent = 0;
  20
  21         git_config(git_default_config); /* no "diff" UI options */
  22         init_revisions(&rev);
  23         rev.abbrev = 0;
  24
  25         argc = setup_revisions(argc, argv, &rev, NULL);
  26         while (1 < argc && argv[1][0] == '-') {
  27                 if (!strcmp(argv[1], "--base"))
  28                         rev.max_count = 1;
  29                 else if (!strcmp(argv[1], "--ours"))
  30                         rev.max_count = 2;
  31                 else if (!strcmp(argv[1], "--theirs"))
  32                         rev.max_count = 3;
  33                 else if (!strcmp(argv[1], "-q"))
  34                         silent = 1;
  35                 else
  36                         usage(diff_files_usage);
  37                 argv++; argc--;
  38         }
  39         if (!rev.diffopt.output_format)
  40                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  41
  42         /*
  43          * Make sure there are NO revision (i.e. pending object) parameter,
  44          * rev.max_count is reasonable (0 <= n <= 3),
  45          * there is no other revision filtering parameters.
  46          */
  47         if (rev.pending.nr ||
  48             rev.min_age != -1 || rev.max_age != -1)
  49                 usage(diff_files_usage);
  50         /*
  51          * Backward compatibility wart - "diff-files -s" used to
  52          * defeat the common diff option "-s" which asked for
  53          * DIFF_FORMAT_NO_OUTPUT.
  54          */
  55         if (rev.diffopt.output_format == DIFF_FORMAT_NO_OUTPUT)
  56                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  57         return run_diff_files(&rev, silent);
  58 }