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 "  -c            show combined diff for merge commits\n"
  90 "  --cc          show combined diff for merge commits removing uninteresting hunks\n"
  91 "  --combined-all-paths\n"
  92 "                show name of file in all parents for combined diffs\n"
  93 "  --root        include the initial commit as diff against /dev/null\n"
  94 COMMON_DIFF_OPTIONS_HELP;
  95
  96 static void diff_tree_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
  97 {
  98         if (!rev->diffopt.output_format) {
  99                 if (rev->dense_combined_merges)
 100                         rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 101                 else
 102                         rev->diffopt.output_format = DIFF_FORMAT_RAW;
 103         }
 104 }
 105
 106 int cmd_diff_tree(int argc, const char **argv, const char *prefix)
 107 {
 108         char line[1000];
 109         struct object *tree1, *tree2;
 110         static struct rev_info *opt = &log_tree_opt;
 111         struct setup_revision_opt s_r_opt;
 112         struct userformat_want w;
 113         int read_stdin = 0;
 114         int merge_base = 0;
 115
 116         if (argc == 2 && !strcmp(argv[1], "-h"))
 117                 usage(diff_tree_usage);
 118
 119         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
 120         repo_init_revisions(the_repository, opt, prefix);
 121         if (read_cache() < 0)
 122                 die(_("index file corrupt"));
 123         opt->abbrev = 0;
 124         opt->diff = 1;
 125         opt->disable_stdin = 1;
 126         memset(&s_r_opt, 0, sizeof(s_r_opt));
 127         s_r_opt.tweak = diff_tree_tweak_rev;
 128
 129         prefix = precompose_argv_prefix(argc, argv, prefix);
 130         argc = setup_revisions(argc, argv, opt, &s_r_opt);
 131
 132         memset(&w, 0, sizeof(w));
 133         userformat_find_requirements(NULL, &w);
 134
 135         if (!opt->show_notes_given && w.notes)
 136                 opt->show_notes = 1;
 137         if (opt->show_notes)
 138                 load_display_notes(&opt->notes_opt);
 139
 140         while (--argc > 0) {
 141                 const char *arg = *++argv;
 142
 143                 if (!strcmp(arg, "--stdin")) {
 144                         read_stdin = 1;
 145                         continue;
 146                 }
 147                 if (!strcmp(arg, "--merge-base")) {
 148                         merge_base = 1;
 149                         continue;
 150                 }
 151                 usage(diff_tree_usage);
 152         }
 153
 154         if (read_stdin && merge_base)
 155                 die(_("options '%s' and '%s' cannot be used together"), "--stdin", "--merge-base");
 156         if (merge_base && opt->pending.nr != 2)
 157                 die(_("--merge-base only works with two commits"));
 158
 159         opt->diffopt.rotate_to_strict = 1;
 160
 161         /*
 162          * NOTE!  We expect "a..b" to expand to "^a b" but it is
 163          * perfectly valid for revision range parser to yield "b ^a",
 164          * which means the same thing. If we get the latter, i.e. the
 165          * second one is marked UNINTERESTING, we recover the original
 166          * order the user gave, i.e. "a..b", by swapping the trees.
 167          */
 168         switch (opt->pending.nr) {
 169         case 0:
 170                 if (!read_stdin)
 171                         usage(diff_tree_usage);
 172                 break;
 173         case 1:
 174                 tree1 = opt->pending.objects[0].item;
 175                 diff_tree_commit_oid(&tree1->oid);
 176                 break;
 177         case 2:
 178                 tree1 = opt->pending.objects[0].item;
 179                 tree2 = opt->pending.objects[1].item;
 180                 if (merge_base) {
 181                         struct object_id oid;
 182
 183                         diff_get_merge_base(opt, &oid);
 184                         tree1 = lookup_object(the_repository, &oid);
 185                 } else if (tree2->flags & UNINTERESTING) {
 186                         SWAP(tree2, tree1);
 187                 }
 188                 diff_tree_oid(&tree1->oid, &tree2->oid, "", &opt->diffopt);
 189                 log_tree_diff_flush(opt);
 190                 break;
 191         }
 192
 193         if (read_stdin) {
 194                 int saved_nrl = 0;
 195                 int saved_dcctc = 0;
 196
 197                 opt->diffopt.rotate_to_strict = 0;
 198                 if (opt->diffopt.detect_rename) {
 199                         if (!the_index.cache)
 200                                 repo_read_index(the_repository);
 201                         opt->diffopt.setup |= DIFF_SETUP_USE_SIZE_CACHE;
 202                 }
 203                 while (fgets(line, sizeof(line), stdin)) {
 204                         struct object_id oid;
 205
 206                         if (get_oid_hex(line, &oid)) {
 207                                 fputs(line, stdout);
 208                                 fflush(stdout);
 209                         }
 210                         else {
 211                                 diff_tree_stdin(line);
 212                                 if (saved_nrl < opt->diffopt.needed_rename_limit)
 213                                         saved_nrl = opt->diffopt.needed_rename_limit;
 214                                 if (opt->diffopt.degraded_cc_to_c)
 215                                         saved_dcctc = 1;
 216                         }
 217                 }
 218                 opt->diffopt.degraded_cc_to_c = saved_dcctc;
 219                 opt->diffopt.needed_rename_limit = saved_nrl;
 220         }
 221
 222         return diff_result_code(&opt->diffopt, 0);
 223 }