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