builtin/diff-tree.c

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