builtin/diff-tree.c

   1 #define USE_THE_INDEX_VARIABLE
   2 #include "builtin.h"
   3 #include "config.h"
   4 #include "diff.h"
   5 #include "commit.h"
   6 #include "gettext.h"
   7 #include "hex.h"
   8 #include "log-tree.h"
   9 #include "submodule.h"
  10 #include "read-cache-ll.h"
  11 #include "repository.h"
  12 #include "revision.h"
  13 #include "tree.h"
  14
  15 static struct rev_info log_tree_opt;
  16
  17 static int diff_tree_commit_oid(const struct object_id *oid)
  18 {
  19         struct commit *commit = lookup_commit_reference(the_repository, oid);
  20         if (!commit)
  21                 return -1;
  22         return log_tree_commit(&log_tree_opt, commit);
  23 }
  24
  25 /* Diff one or more commits. */
  26 static int stdin_diff_commit(struct commit *commit, const char *p)
  27 {
  28         struct object_id oid;
  29         struct commit_list **pptr = NULL;
  30
  31         /* Graft the fake parents locally to the commit */
  32         while (isspace(*p++) && !parse_oid_hex(p, &oid, &p)) {
  33                 struct commit *parent = lookup_commit(the_repository, &oid);
  34                 if (!pptr) {
  35                         /* Free the real parent list */
  36                         free_commit_list(commit->parents);
  37                         commit->parents = NULL;
  38                         pptr = &(commit->parents);
  39                 }
  40                 if (parent) {
  41                         pptr = &commit_list_insert(parent, pptr)->next;
  42                 }
  43         }
  44         return log_tree_commit(&log_tree_opt, commit);
  45 }
  46
  47 /* Diff two trees. */
  48 static int stdin_diff_trees(struct tree *tree1, const char *p)
  49 {
  50         struct object_id oid;
  51         struct tree *tree2;
  52         if (!isspace(*p++) || parse_oid_hex(p, &oid, &p) || *p)
  53                 return error("Need exactly two trees, separated by a space");
  54         tree2 = lookup_tree(the_repository, &oid);
  55         if (!tree2 || parse_tree(tree2))
  56                 return -1;
  57         printf("%s %s\n", oid_to_hex(&tree1->object.oid),
  58                           oid_to_hex(&tree2->object.oid));
  59         diff_tree_oid(&tree1->object.oid, &tree2->object.oid,
  60                       "", &log_tree_opt.diffopt);
  61         log_tree_diff_flush(&log_tree_opt);
  62         return 0;
  63 }
  64
  65 static int diff_tree_stdin(char *line)
  66 {
  67         int len = strlen(line);
  68         struct object_id oid;
  69         struct object *obj;
  70         const char *p;
  71
  72         if (!len || line[len-1] != '\n')
  73                 return -1;
  74         line[len-1] = 0;
  75         if (parse_oid_hex(line, &oid, &p))
  76                 return -1;
  77         obj = parse_object(the_repository, &oid);
  78         if (!obj)
  79                 return -1;
  80         if (obj->type == OBJ_COMMIT)
  81                 return stdin_diff_commit((struct commit *)obj, p);
  82         if (obj->type == OBJ_TREE)
  83                 return stdin_diff_trees((struct tree *)obj, p);
  84         error("Object %s is a %s, not a commit or tree",
  85               oid_to_hex(&oid), type_name(obj->type));
  86         return -1;
  87 }
  88
  89 static const char diff_tree_usage[] =
  90 "git diff-tree [--stdin] [-m] [-s] [-v] [--no-commit-id] [--pretty]\n"
  91 "              [-t] [-r] [-c | --cc] [--combined-all-paths] [--root] [--merge-base]\n"
  92 "              [<common-diff-options>] <tree-ish> [<tree-ish>] [<path>...]\n"
  93 "\n"
  94 "  -r            diff recursively\n"
  95 "  -c            show combined diff for merge commits\n"
  96 "  --cc          show combined diff for merge commits removing uninteresting hunks\n"
  97 "  --combined-all-paths\n"
  98 "                show name of file in all parents for combined diffs\n"
  99 "  --root        include the initial commit as diff against /dev/null\n"
 100 COMMON_DIFF_OPTIONS_HELP;
 101
 102 static void diff_tree_tweak_rev(struct rev_info *rev)
 103 {
 104         if (!rev->diffopt.output_format) {
 105                 if (rev->dense_combined_merges)
 106                         rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 107                 else
 108                         rev->diffopt.output_format = DIFF_FORMAT_RAW;
 109         }
 110 }
 111
 112 int cmd_diff_tree(int argc, const char **argv, const char *prefix)
 113 {
 114         char line[1000];
 115         struct object *tree1, *tree2;
 116         static struct rev_info *opt = &log_tree_opt;
 117         struct setup_revision_opt s_r_opt;
 118         struct userformat_want w;
 119         int read_stdin = 0;
 120         int merge_base = 0;
 121
 122         if (argc == 2 && !strcmp(argv[1], "-h"))
 123                 usage(diff_tree_usage);
 124
 125         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
 126
 127         prepare_repo_settings(the_repository);
 128         the_repository->settings.command_requires_full_index = 0;
 129
 130         repo_init_revisions(the_repository, opt, prefix);
 131         if (repo_read_index(the_repository) < 0)
 132                 die(_("index file corrupt"));
 133         opt->abbrev = 0;
 134         opt->diff = 1;
 135         opt->disable_stdin = 1;
 136         memset(&s_r_opt, 0, sizeof(s_r_opt));
 137         s_r_opt.tweak = diff_tree_tweak_rev;
 138
 139         prefix = precompose_argv_prefix(argc, argv, prefix);
 140         argc = setup_revisions(argc, argv, opt, &s_r_opt);
 141
 142         memset(&w, 0, sizeof(w));
 143         userformat_find_requirements(NULL, &w);
 144
 145         if (!opt->show_notes_given && w.notes)
 146                 opt->show_notes = 1;
 147         if (opt->show_notes)
 148                 load_display_notes(&opt->notes_opt);
 149
 150         while (--argc > 0) {
 151                 const char *arg = *++argv;
 152
 153                 if (!strcmp(arg, "--stdin")) {
 154                         read_stdin = 1;
 155                         continue;
 156                 }
 157                 if (!strcmp(arg, "--merge-base")) {
 158                         merge_base = 1;
 159                         continue;
 160                 }
 161                 usage(diff_tree_usage);
 162         }
 163
 164         if (read_stdin && merge_base)
 165                 die(_("options '%s' and '%s' cannot be used together"), "--stdin", "--merge-base");
 166         if (merge_base && opt->pending.nr != 2)
 167                 die(_("--merge-base only works with two commits"));
 168
 169         opt->diffopt.rotate_to_strict = 1;
 170
 171         /*
 172          * NOTE!  We expect "a..b" to expand to "^a b" but it is
 173          * perfectly valid for revision range parser to yield "b ^a",
 174          * which means the same thing. If we get the latter, i.e. the
 175          * second one is marked UNINTERESTING, we recover the original
 176          * order the user gave, i.e. "a..b", by swapping the trees.
 177          */
 178         switch (opt->pending.nr) {
 179         case 0:
 180                 if (!read_stdin)
 181                         usage(diff_tree_usage);
 182                 break;
 183         case 1:
 184                 tree1 = opt->pending.objects[0].item;
 185                 diff_tree_commit_oid(&tree1->oid);
 186                 break;
 187         case 2:
 188                 tree1 = opt->pending.objects[0].item;
 189                 tree2 = opt->pending.objects[1].item;
 190                 if (merge_base) {
 191                         struct object_id oid;
 192
 193                         diff_get_merge_base(opt, &oid);
 194                         tree1 = lookup_object(the_repository, &oid);
 195                 } else if (tree2->flags & UNINTERESTING) {
 196                         SWAP(tree2, tree1);
 197                 }
 198                 diff_tree_oid(&tree1->oid, &tree2->oid, "", &opt->diffopt);
 199                 log_tree_diff_flush(opt);
 200                 break;
 201         }
 202
 203         if (read_stdin) {
 204                 int saved_nrl = 0;
 205                 int saved_dcctc = 0;
 206
 207                 opt->diffopt.rotate_to_strict = 0;
 208                 opt->diffopt.no_free = 1;
 209                 if (opt->diffopt.detect_rename) {
 210                         if (!the_index.cache)
 211                                 repo_read_index(the_repository);
 212                         opt->diffopt.setup |= DIFF_SETUP_USE_SIZE_CACHE;
 213                 }
 214                 while (fgets(line, sizeof(line), stdin)) {
 215                         struct object_id oid;
 216
 217                         if (get_oid_hex(line, &oid)) {
 218                                 fputs(line, stdout);
 219                                 fflush(stdout);
 220                         }
 221                         else {
 222                                 diff_tree_stdin(line);
 223                                 if (saved_nrl < opt->diffopt.needed_rename_limit)
 224                                         saved_nrl = opt->diffopt.needed_rename_limit;
 225                                 if (opt->diffopt.degraded_cc_to_c)
 226                                         saved_dcctc = 1;
 227                         }
 228                 }
 229                 opt->diffopt.degraded_cc_to_c = saved_dcctc;
 230                 opt->diffopt.needed_rename_limit = saved_nrl;
 231                 opt->diffopt.no_free = 0;
 232                 diff_free(&opt->diffopt);
 233         }
 234
 235         return diff_result_code(&opt->diffopt, 0);
 236 }