builtin/diff-files.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "builtin.h"
   7 #include "config.h"
   8 #include "diff.h"
   9 #include "diff-merges.h"
  10 #include "commit.h"
  11 #include "preload-index.h"
  12 #include "repository.h"
  13 #include "revision.h"
  14 #include "submodule.h"
  15
  16 static const char diff_files_usage[] =
  17 "git diff-files [-q] [-0 | -1 | -2 | -3 | -c | --cc] [<common-diff-options>] [<path>...]"
  18 "\n"
  19 COMMON_DIFF_OPTIONS_HELP;
  20
  21 int cmd_diff_files(int argc, const char **argv, const char *prefix)
  22 {
  23         struct rev_info rev;
  24         int result;
  25         unsigned options = 0;
  26
  27         if (argc == 2 && !strcmp(argv[1], "-h"))
  28                 usage(diff_files_usage);
  29
  30         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
  31
  32         prepare_repo_settings(the_repository);
  33         the_repository->settings.command_requires_full_index = 0;
  34
  35         repo_init_revisions(the_repository, &rev, prefix);
  36         rev.abbrev = 0;
  37
  38         /*
  39          * Consider "intent-to-add" files as new by default, unless
  40          * explicitly specified in the command line or anywhere else.
  41          */
  42         rev.diffopt.ita_invisible_in_index = 1;
  43
  44         prefix = precompose_argv_prefix(argc, argv, prefix);
  45
  46         argc = setup_revisions(argc, argv, &rev, NULL);
  47         while (1 < argc && argv[1][0] == '-') {
  48                 if (!strcmp(argv[1], "--base"))
  49                         rev.max_count = 1;
  50                 else if (!strcmp(argv[1], "--ours"))
  51                         rev.max_count = 2;
  52                 else if (!strcmp(argv[1], "--theirs"))
  53                         rev.max_count = 3;
  54                 else if (!strcmp(argv[1], "-q"))
  55                         options |= DIFF_SILENT_ON_REMOVED;
  56                 else
  57                         usage(diff_files_usage);
  58                 argv++; argc--;
  59         }
  60         if (!rev.diffopt.output_format)
  61                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  62         rev.diffopt.rotate_to_strict = 1;
  63
  64         /*
  65          * Make sure there are NO revision (i.e. pending object) parameter,
  66          * rev.max_count is reasonable (0 <= n <= 3), and
  67          * there is no other revision filtering parameters.
  68          */
  69         if (rev.pending.nr ||
  70             rev.min_age != -1 || rev.max_age != -1 ||
  71             3 < rev.max_count)
  72                 usage(diff_files_usage);
  73
  74         /*
  75          * "diff-files --base -p" should not combine merges because it
  76          * was not asked to.  "diff-files -c -p" should not densify
  77          * (the user should ask with "diff-files --cc" explicitly).
  78          */
  79         if (rev.max_count == -1 &&
  80             (rev.diffopt.output_format & DIFF_FORMAT_PATCH))
  81                 diff_merges_set_dense_combined_if_unset(&rev);
  82
  83         if (repo_read_index_preload(the_repository, &rev.diffopt.pathspec, 0) < 0) {
  84                 perror("repo_read_index_preload");
  85                 result = -1;
  86                 goto cleanup;
  87         }
  88         result = run_diff_files(&rev, options);
  89         result = diff_result_code(&rev.diffopt, result);
  90 cleanup:
  91         release_revisions(&rev);
  92         return result;
  93 }