builtin/diff-tree.c

   1 #include "cache.h"
   2 #include "diff.h"
   3 #include "commit.h"
   4 #include "log-tree.h"
   5 #include "builtin.h"
   6 #include "submodule.h"
   7
   8 static struct rev_info log_tree_opt;
   9
  10 static int diff_tree_commit_sha1(const struct object_id *oid)
  11 {
  12         struct commit *commit = lookup_commit_reference(oid);
  13         if (!commit)
  14                 return -1;
  15         return log_tree_commit(&log_tree_opt, commit);
  16 }
  17
  18 /* Diff one or more commits. */
  19 static int stdin_diff_commit(struct commit *commit, const char *p)
  20 {
  21         struct object_id oid;
  22         struct commit_list **pptr = NULL;
  23
  24         /* Graft the fake parents locally to the commit */
  25         while (isspace(*p++) && !parse_oid_hex(p, &oid, &p)) {
  26                 struct commit *parent = lookup_commit(&oid);
  27                 if (!pptr) {
  28                         /* Free the real parent list */
  29                         free_commit_list(commit->parents);
  30                         commit->parents = NULL;
  31                         pptr = &(commit->parents);
  32                 }
  33                 if (parent) {
  34                         pptr = &commit_list_insert(parent, pptr)->next;
  35                 }
  36         }
  37         return log_tree_commit(&log_tree_opt, commit);
  38 }
  39
  40 /* Diff two trees. */
  41 static int stdin_diff_trees(struct tree *tree1, const char *p)
  42 {
  43         struct object_id oid;
  44         struct tree *tree2;
  45         if (!isspace(*p++) || parse_oid_hex(p, &oid, &p) || *p)
  46                 return error("Need exactly two trees, separated by a space");
  47         tree2 = lookup_tree(&oid);
  48         if (!tree2 || parse_tree(tree2))
  49                 return -1;
  50         printf("%s %s\n", oid_to_hex(&tree1->object.oid),
  51                           oid_to_hex(&tree2->object.oid));
  52         diff_tree_sha1(tree1->object.oid.hash, tree2->object.oid.hash,
  53                        "", &log_tree_opt.diffopt);
  54         log_tree_diff_flush(&log_tree_opt);
  55         return 0;
  56 }
  57
  58 static int diff_tree_stdin(char *line)
  59 {
  60         int len = strlen(line);
  61         struct object_id oid;
  62         struct object *obj;
  63         const char *p;
  64
  65         if (!len || line[len-1] != '\n')
  66                 return -1;
  67         line[len-1] = 0;
  68         if (parse_oid_hex(line, &oid, &p))
  69                 return -1;
  70         obj = parse_object(&oid);
  71         if (!obj)
  72                 return -1;
  73         if (obj->type == OBJ_COMMIT)
  74                 return stdin_diff_commit((struct commit *)obj, p);
  75         if (obj->type == OBJ_TREE)
  76                 return stdin_diff_trees((struct tree *)obj, p);
  77         error("Object %s is a %s, not a commit or tree",
  78               oid_to_hex(&oid), typename(obj->type));
  79         return -1;
  80 }
  81
  82 static const char diff_tree_usage[] =
  83 "git diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
  84 "[<common-diff-options>] <tree-ish> [<tree-ish>] [<path>...]\n"
  85 "  -r            diff recursively\n"
  86 "  --root        include the initial commit as diff against /dev/null\n"
  87 COMMON_DIFF_OPTIONS_HELP;
  88
  89 static void diff_tree_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
  90 {
  91         if (!rev->diffopt.output_format) {
  92                 if (rev->dense_combined_merges)
  93                         rev->diffopt.output_format = DIFF_FORMAT_PATCH;
  94                 else
  95                         rev->diffopt.output_format = DIFF_FORMAT_RAW;
  96         }
  97 }
  98
  99 int cmd_diff_tree(int argc, const char **argv, const char *prefix)
 100 {
 101         int nr_sha1;
 102         char line[1000];
 103         struct object *tree1, *tree2;
 104         static struct rev_info *opt = &log_tree_opt;
 105         struct setup_revision_opt s_r_opt;
 106         int read_stdin = 0;
 107
 108         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
 109         init_revisions(opt, prefix);
 110         gitmodules_config();
 111         opt->abbrev = 0;
 112         opt->diff = 1;
 113         opt->disable_stdin = 1;
 114         memset(&s_r_opt, 0, sizeof(s_r_opt));
 115         s_r_opt.tweak = diff_tree_tweak_rev;
 116
 117         precompose_argv(argc, argv);
 118         argc = setup_revisions(argc, argv, opt, &s_r_opt);
 119
 120         while (--argc > 0) {
 121                 const char *arg = *++argv;
 122
 123                 if (!strcmp(arg, "--stdin")) {
 124                         read_stdin = 1;
 125                         continue;
 126                 }
 127                 usage(diff_tree_usage);
 128         }
 129
 130         /*
 131          * NOTE!  We expect "a..b" to expand to "^a b" but it is
 132          * perfectly valid for revision range parser to yield "b ^a",
 133          * which means the same thing. If we get the latter, i.e. the
 134          * second one is marked UNINTERESTING, we recover the original
 135          * order the user gave, i.e. "a..b", by swapping the trees.
 136          */
 137         nr_sha1 = opt->pending.nr;
 138         switch (nr_sha1) {
 139         case 0:
 140                 if (!read_stdin)
 141                         usage(diff_tree_usage);
 142                 break;
 143         case 1:
 144                 tree1 = opt->pending.objects[0].item;
 145                 diff_tree_commit_sha1(&tree1->oid);
 146                 break;
 147         case 2:
 148                 tree1 = opt->pending.objects[0].item;
 149                 tree2 = opt->pending.objects[1].item;
 150                 if (tree2->flags & UNINTERESTING) {
 151                         SWAP(tree2, tree1);
 152                 }
 153                 diff_tree_sha1(tree1->oid.hash,
 154                                tree2->oid.hash,
 155                                "", &opt->diffopt);
 156                 log_tree_diff_flush(opt);
 157                 break;
 158         }
 159
 160         if (read_stdin) {
 161                 int saved_nrl = 0;
 162                 int saved_dcctc = 0;
 163
 164                 if (opt->diffopt.detect_rename)
 165                         opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 166                                                DIFF_SETUP_USE_CACHE);
 167                 while (fgets(line, sizeof(line), stdin)) {
 168                         struct object_id oid;
 169
 170                         if (get_oid_hex(line, &oid)) {
 171                                 fputs(line, stdout);
 172                                 fflush(stdout);
 173                         }
 174                         else {
 175                                 diff_tree_stdin(line);
 176                                 if (saved_nrl < opt->diffopt.needed_rename_limit)
 177                                         saved_nrl = opt->diffopt.needed_rename_limit;
 178                                 if (opt->diffopt.degraded_cc_to_c)
 179                                         saved_dcctc = 1;
 180                         }
 181                 }
 182                 opt->diffopt.degraded_cc_to_c = saved_dcctc;
 183                 opt->diffopt.needed_rename_limit = saved_nrl;
 184         }
 185
 186         return diff_result_code(&opt->diffopt, 0);
 187 }