builtin/diff-tree.c

   1 #define USE_THE_INDEX_COMPATIBILITY_MACROS
   2 #include "cache.h"
   3 #include "config.h"
   4 #include "diff.h"
   5 #include "commit.h"
   6 #include "log-tree.h"
   7 #include "builtin.h"
   8 #include "submodule.h"
   9 #include "repository.h"
  10
  11 static struct rev_info log_tree_opt;
  12
  13 static int diff_tree_commit_oid(const struct object_id *oid)
  14 {
  15         struct commit *commit = lookup_commit_reference(the_repository, oid);
  16         if (!commit)
  17                 return -1;
  18         return log_tree_commit(&log_tree_opt, commit);
  19 }
  20
  21 /* Diff one or more commits. */
  22 static int stdin_diff_commit(struct commit *commit, const char *p)
  23 {
  24         struct object_id oid;
  25         struct commit_list **pptr = NULL;
  26
  27         /* Graft the fake parents locally to the commit */
  28         while (isspace(*p++) && !parse_oid_hex(p, &oid, &p)) {
  29                 struct commit *parent = lookup_commit(the_repository, &oid);
  30                 if (!pptr) {
  31                         /* Free the real parent list */
  32                         free_commit_list(commit->parents);
  33                         commit->parents = NULL;
  34                         pptr = &(commit->parents);
  35                 }
  36                 if (parent) {
  37                         pptr = &commit_list_insert(parent, pptr)->next;
  38                 }
  39         }
  40         return log_tree_commit(&log_tree_opt, commit);
  41 }
  42
  43 /* Diff two trees. */
  44 static int stdin_diff_trees(struct tree *tree1, const char *p)
  45 {
  46         struct object_id oid;
  47         struct tree *tree2;
  48         if (!isspace(*p++) || parse_oid_hex(p, &oid, &p) || *p)
  49                 return error("Need exactly two trees, separated by a space");
  50         tree2 = lookup_tree(the_repository, &oid);
  51         if (!tree2 || parse_tree(tree2))
  52                 return -1;
  53         printf("%s %s\n", oid_to_hex(&tree1->object.oid),
  54                           oid_to_hex(&tree2->object.oid));
  55         diff_tree_oid(&tree1->object.oid, &tree2->object.oid,
  56                       "", &log_tree_opt.diffopt);
  57         log_tree_diff_flush(&log_tree_opt);
  58         return 0;
  59 }
  60
  61 static int diff_tree_stdin(char *line)
  62 {
  63         int len = strlen(line);
  64         struct object_id oid;
  65         struct object *obj;
  66         const char *p;
  67
  68         if (!len || line[len-1] != '\n')
  69                 return -1;
  70         line[len-1] = 0;
  71         if (parse_oid_hex(line, &oid, &p))
  72                 return -1;
  73         obj = parse_object(the_repository, &oid);
  74         if (!obj)
  75                 return -1;
  76         if (obj->type == OBJ_COMMIT)
  77                 return stdin_diff_commit((struct commit *)obj, p);
  78         if (obj->type == OBJ_TREE)
  79                 return stdin_diff_trees((struct tree *)obj, p);
  80         error("Object %s is a %s, not a commit or tree",
  81               oid_to_hex(&oid), type_name(obj->type));
  82         return -1;
  83 }
  84
  85 static const char diff_tree_usage[] =
  86 "git diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
  87 "[<common-diff-options>] <tree-ish> [<tree-ish>] [<path>...]\n"
  88 "  -r            diff recursively\n"
  89 "  --root        include the initial commit as diff against /dev/null\n"
  90 COMMON_DIFF_OPTIONS_HELP;
  91
  92 static void diff_tree_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
  93 {
  94         if (!rev->diffopt.output_format) {
  95                 if (rev->dense_combined_merges)
  96                         rev->diffopt.output_format = DIFF_FORMAT_PATCH;
  97                 else
  98                         rev->diffopt.output_format = DIFF_FORMAT_RAW;
  99         }
 100 }
 101
 102 int cmd_diff_tree(int argc, const char **argv, const char *prefix)
 103 {
 104         char line[1000];
 105         struct object *tree1, *tree2;
 106         static struct rev_info *opt = &log_tree_opt;
 107         struct setup_revision_opt s_r_opt;
 108         int read_stdin = 0;
 109
 110         if (argc == 2 && !strcmp(argv[1], "-h"))
 111                 usage(diff_tree_usage);
 112
 113         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
 114         repo_init_revisions(the_repository, opt, prefix);
 115         if (read_cache() < 0)
 116                 die(_("index file corrupt"));
 117         opt->abbrev = 0;
 118         opt->diff = 1;
 119         opt->disable_stdin = 1;
 120         memset(&s_r_opt, 0, sizeof(s_r_opt));
 121         s_r_opt.tweak = diff_tree_tweak_rev;
 122
 123         precompose_argv(argc, argv);
 124         argc = setup_revisions(argc, argv, opt, &s_r_opt);
 125
 126         while (--argc > 0) {
 127                 const char *arg = *++argv;
 128
 129                 if (!strcmp(arg, "--stdin")) {
 130                         read_stdin = 1;
 131                         continue;
 132                 }
 133                 usage(diff_tree_usage);
 134         }
 135
 136         /*
 137          * NOTE!  We expect "a..b" to expand to "^a b" but it is
 138          * perfectly valid for revision range parser to yield "b ^a",
 139          * which means the same thing. If we get the latter, i.e. the
 140          * second one is marked UNINTERESTING, we recover the original
 141          * order the user gave, i.e. "a..b", by swapping the trees.
 142          */
 143         switch (opt->pending.nr) {
 144         case 0:
 145                 if (!read_stdin)
 146                         usage(diff_tree_usage);
 147                 break;
 148         case 1:
 149                 tree1 = opt->pending.objects[0].item;
 150                 diff_tree_commit_oid(&tree1->oid);
 151                 break;
 152         case 2:
 153                 tree1 = opt->pending.objects[0].item;
 154                 tree2 = opt->pending.objects[1].item;
 155                 if (tree2->flags & UNINTERESTING) {
 156                         SWAP(tree2, tree1);
 157                 }
 158                 diff_tree_oid(&tree1->oid, &tree2->oid, "", &opt->diffopt);
 159                 log_tree_diff_flush(opt);
 160                 break;
 161         }
 162
 163         if (read_stdin) {
 164                 int saved_nrl = 0;
 165                 int saved_dcctc = 0;
 166
 167                 if (opt->diffopt.detect_rename) {
 168                         if (!the_index.cache)
 169                                 repo_read_index(the_repository);
 170                         opt->diffopt.setup |= DIFF_SETUP_USE_SIZE_CACHE;
 171                 }
 172                 while (fgets(line, sizeof(line), stdin)) {
 173                         struct object_id oid;
 174
 175                         if (get_oid_hex(line, &oid)) {
 176                                 fputs(line, stdout);
 177                                 fflush(stdout);
 178                         }
 179                         else {
 180                                 diff_tree_stdin(line);
 181                                 if (saved_nrl < opt->diffopt.needed_rename_limit)
 182                                         saved_nrl = opt->diffopt.needed_rename_limit;
 183                                 if (opt->diffopt.degraded_cc_to_c)
 184                                         saved_dcctc = 1;
 185                         }
 186                 }
 187                 opt->diffopt.degraded_cc_to_c = saved_dcctc;
 188                 opt->diffopt.needed_rename_limit = saved_nrl;
 189         }
 190
 191         return diff_result_code(&opt->diffopt, 0);
 192 }