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 unsigned char *sha1)
  11 {
  12         struct commit *commit = lookup_commit_reference(sha1);
  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, char *line, int len)
  20 {
  21         unsigned char sha1[20];
  22         if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
  23                 /* Graft the fake parents locally to the commit */
  24                 int pos = 41;
  25                 struct commit_list **pptr;
  26
  27                 /* Free the real parent list */
  28                 free_commit_list(commit->parents);
  29                 commit->parents = NULL;
  30                 pptr = &(commit->parents);
  31                 while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
  32                         struct commit *parent = lookup_commit(sha1);
  33                         if (parent) {
  34                                 pptr = &commit_list_insert(parent, pptr)->next;
  35                         }
  36                         pos += 41;
  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, char *line, int len)
  44 {
  45         unsigned char sha1[20];
  46         struct tree *tree2;
  47         if (len != 82 || !isspace(line[40]) || get_sha1_hex(line + 41, sha1))
  48                 return error("Need exactly two trees, separated by a space");
  49         tree2 = lookup_tree(sha1);
  50         if (!tree2 || parse_tree(tree2))
  51                 return -1;
  52         printf("%s %s\n", sha1_to_hex(tree1->object.sha1),
  53                           sha1_to_hex(tree2->object.sha1));
  54         diff_tree_sha1(tree1->object.sha1, tree2->object.sha1,
  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         unsigned char sha1[20];
  64         struct object *obj;
  65
  66         if (!len || line[len-1] != '\n')
  67                 return -1;
  68         line[len-1] = 0;
  69         if (get_sha1_hex(line, sha1))
  70                 return -1;
  71         obj = lookup_unknown_object(sha1);
  72         if (!obj || !obj->parsed)
  73                 obj = parse_object(sha1);
  74         if (!obj)
  75                 return -1;
  76         if (obj->type == OBJ_COMMIT)
  77                 return stdin_diff_commit((struct commit *)obj, line, len);
  78         if (obj->type == OBJ_TREE)
  79                 return stdin_diff_trees((struct tree *)obj, line, len);
  80         error("Object %s is a %s, not a commit or tree",
  81               sha1_to_hex(sha1), typename(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 "  --root        include the initial commit as diff against /dev/null\n"
  90 COMMON_DIFF_OPTIONS_HELP;
  91
  92 static void diff_tree_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
  93 {
  94         if (!rev->diffopt.output_format) {
  95                 if (rev->dense_combined_merges)
  96                         rev->diffopt.output_format = DIFF_FORMAT_PATCH;
  97                 else
  98                         rev->diffopt.output_format = DIFF_FORMAT_RAW;
  99         }
 100 }
 101
 102 int cmd_diff_tree(int argc, const char **argv, const char *prefix)
 103 {
 104         int nr_sha1;
 105         char line[1000];
 106         struct object *tree1, *tree2;
 107         static struct rev_info *opt = &log_tree_opt;
 108         struct setup_revision_opt s_r_opt;
 109         int read_stdin = 0;
 110
 111         init_revisions(opt, prefix);
 112         gitmodules_config();
 113         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
 114         opt->abbrev = 0;
 115         opt->diff = 1;
 116         opt->disable_stdin = 1;
 117         memset(&s_r_opt, 0, sizeof(s_r_opt));
 118         s_r_opt.tweak = diff_tree_tweak_rev;
 119         argc = setup_revisions(argc, argv, opt, &s_r_opt);
 120
 121         while (--argc > 0) {
 122                 const char *arg = *++argv;
 123
 124                 if (!strcmp(arg, "--stdin")) {
 125                         read_stdin = 1;
 126                         continue;
 127                 }
 128                 usage(diff_tree_usage);
 129         }
 130
 131         /*
 132          * NOTE! We expect "a ^b" to be equal to "a..b", so we
 133          * reverse the order of the objects if the second one
 134          * is marked UNINTERESTING.
 135          */
 136         nr_sha1 = opt->pending.nr;
 137         switch (nr_sha1) {
 138         case 0:
 139                 if (!read_stdin)
 140                         usage(diff_tree_usage);
 141                 break;
 142         case 1:
 143                 tree1 = opt->pending.objects[0].item;
 144                 diff_tree_commit_sha1(tree1->sha1);
 145                 break;
 146         case 2:
 147                 tree1 = opt->pending.objects[0].item;
 148                 tree2 = opt->pending.objects[1].item;
 149                 if (tree2->flags & UNINTERESTING) {
 150                         struct object *tmp = tree2;
 151                         tree2 = tree1;
 152                         tree1 = tmp;
 153                 }
 154                 diff_tree_sha1(tree1->sha1,
 155                                tree2->sha1,
 156                                "", &opt->diffopt);
 157                 log_tree_diff_flush(opt);
 158                 break;
 159         }
 160
 161         if (read_stdin) {
 162                 int saved_nrl = 0;
 163                 int saved_dcctc = 0;
 164
 165                 if (opt->diffopt.detect_rename)
 166                         opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 167                                                DIFF_SETUP_USE_CACHE);
 168                 while (fgets(line, sizeof(line), stdin)) {
 169                         unsigned char sha1[20];
 170
 171                         if (get_sha1_hex(line, sha1)) {
 172                                 fputs(line, stdout);
 173                                 fflush(stdout);
 174                         }
 175                         else {
 176                                 diff_tree_stdin(line);
 177                                 if (saved_nrl < opt->diffopt.needed_rename_limit)
 178                                         saved_nrl = opt->diffopt.needed_rename_limit;
 179                                 if (opt->diffopt.degraded_cc_to_c)
 180                                         saved_dcctc = 1;
 181                         }
 182                 }
 183                 opt->diffopt.degraded_cc_to_c = saved_dcctc;
 184                 opt->diffopt.needed_rename_limit = saved_nrl;
 185         }
 186
 187         return diff_result_code(&opt->diffopt, 0);
 188 }