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
   7 static struct rev_info log_tree_opt;
   8
   9 static int diff_tree_commit_sha1(const unsigned char *sha1)
  10 {
  11         struct commit *commit = lookup_commit_reference(sha1);
  12         if (!commit)
  13                 return -1;
  14         return log_tree_commit(&log_tree_opt, commit);
  15 }
  16
  17 /* Diff one or more commits. */
  18 static int stdin_diff_commit(struct commit *commit, char *line, int len)
  19 {
  20         unsigned char sha1[20];
  21         if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
  22                 /* Graft the fake parents locally to the commit */
  23                 int pos = 41;
  24                 struct commit_list **pptr, *parents;
  25
  26                 /* Free the real parent list */
  27                 for (parents = commit->parents; parents; ) {
  28                         struct commit_list *tmp = parents->next;
  29                         free(parents);
  30                         parents = tmp;
  31                 }
  32                 commit->parents = NULL;
  33                 pptr = &(commit->parents);
  34                 while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
  35                         struct commit *parent = lookup_commit(sha1);
  36                         if (parent) {
  37                                 pptr = &commit_list_insert(parent, pptr)->next;
  38                         }
  39                         pos += 41;
  40                 }
  41         }
  42         return log_tree_commit(&log_tree_opt, commit);
  43 }
  44
  45 /* Diff two trees. */
  46 static int stdin_diff_trees(struct tree *tree1, char *line, int len)
  47 {
  48         unsigned char sha1[20];
  49         struct tree *tree2;
  50         if (len != 82 || !isspace(line[40]) || get_sha1_hex(line + 41, sha1))
  51                 return error("Need exactly two trees, separated by a space");
  52         tree2 = lookup_tree(sha1);
  53         if (!tree2 || parse_tree(tree2))
  54                 return -1;
  55         printf("%s %s\n", sha1_to_hex(tree1->object.sha1),
  56                           sha1_to_hex(tree2->object.sha1));
  57         diff_tree_sha1(tree1->object.sha1, tree2->object.sha1,
  58                        "", &log_tree_opt.diffopt);
  59         log_tree_diff_flush(&log_tree_opt);
  60         return 0;
  61 }
  62
  63 static int diff_tree_stdin(char *line)
  64 {
  65         int len = strlen(line);
  66         unsigned char sha1[20];
  67         struct object *obj;
  68
  69         if (!len || line[len-1] != '\n')
  70                 return -1;
  71         line[len-1] = 0;
  72         if (get_sha1_hex(line, sha1))
  73                 return -1;
  74         obj = lookup_unknown_object(sha1);
  75         if (!obj || !obj->parsed)
  76                 obj = parse_object(sha1);
  77         if (!obj)
  78                 return -1;
  79         if (obj->type == OBJ_COMMIT)
  80                 return stdin_diff_commit((struct commit *)obj, line, len);
  81         if (obj->type == OBJ_TREE)
  82                 return stdin_diff_trees((struct tree *)obj, line, len);
  83         error("Object %s is a %s, not a commit or tree",
  84               sha1_to_hex(sha1), typename(obj->type));
  85         return -1;
  86 }
  87
  88 static const char diff_tree_usage[] =
  89 "git diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
  90 "[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
  91 "  -r            diff recursively\n"
  92 "  --root        include the initial commit as diff against /dev/null\n"
  93 COMMON_DIFF_OPTIONS_HELP;
  94
  95 static void diff_tree_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
  96 {
  97         if (!rev->diffopt.output_format) {
  98                 if (rev->dense_combined_merges)
  99                         rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 100                 else
 101                         rev->diffopt.output_format = DIFF_FORMAT_RAW;
 102         }
 103 }
 104
 105 int cmd_diff_tree(int argc, const char **argv, const char *prefix)
 106 {
 107         int nr_sha1;
 108         char line[1000];
 109         struct object *tree1, *tree2;
 110         static struct rev_info *opt = &log_tree_opt;
 111         struct setup_revision_opt s_r_opt;
 112         int read_stdin = 0;
 113
 114         init_revisions(opt, prefix);
 115         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
 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         argc = setup_revisions(argc, argv, opt, &s_r_opt);
 122
 123         while (--argc > 0) {
 124                 const char *arg = *++argv;
 125
 126                 if (!strcmp(arg, "--stdin")) {
 127                         read_stdin = 1;
 128                         continue;
 129                 }
 130                 usage(diff_tree_usage);
 131         }
 132
 133         /*
 134          * NOTE! We expect "a ^b" to be equal to "a..b", so we
 135          * reverse the order of the objects if the second one
 136          * is marked UNINTERESTING.
 137          */
 138         nr_sha1 = opt->pending.nr;
 139         switch (nr_sha1) {
 140         case 0:
 141                 if (!read_stdin)
 142                         usage(diff_tree_usage);
 143                 break;
 144         case 1:
 145                 tree1 = opt->pending.objects[0].item;
 146                 diff_tree_commit_sha1(tree1->sha1);
 147                 break;
 148         case 2:
 149                 tree1 = opt->pending.objects[0].item;
 150                 tree2 = opt->pending.objects[1].item;
 151                 if (tree2->flags & UNINTERESTING) {
 152                         struct object *tmp = tree2;
 153                         tree2 = tree1;
 154                         tree1 = tmp;
 155                 }
 156                 diff_tree_sha1(tree1->sha1,
 157                                tree2->sha1,
 158                                "", &opt->diffopt);
 159                 log_tree_diff_flush(opt);
 160                 break;
 161         }
 162
 163         if (read_stdin) {
 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                         unsigned char sha1[20];
 169
 170                         if (get_sha1_hex(line, sha1)) {
 171                                 fputs(line, stdout);
 172                                 fflush(stdout);
 173                         }
 174                         else
 175                                 diff_tree_stdin(line);
 176                 }
 177         }
 178
 179         return diff_result_code(&opt->diffopt, 0);
 180 }