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, *parents;
  26
  27                 /* Free the real parent list */
  28                 for (parents = commit->parents; parents; ) {
  29                         struct commit_list *tmp = parents->next;
  30                         free(parents);
  31                         parents = tmp;
  32                 }
  33                 commit->parents = NULL;
  34                 pptr = &(commit->parents);
  35                 while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
  36                         struct commit *parent = lookup_commit(sha1);
  37                         if (parent) {
  38                                 pptr = &commit_list_insert(parent, pptr)->next;
  39                         }
  40                         pos += 41;
  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, char *line, int len)
  48 {
  49         unsigned char sha1[20];
  50         struct tree *tree2;
  51         if (len != 82 || !isspace(line[40]) || get_sha1_hex(line + 41, sha1))
  52                 return error("Need exactly two trees, separated by a space");
  53         tree2 = lookup_tree(sha1);
  54         if (!tree2 || parse_tree(tree2))
  55                 return -1;
  56         printf("%s %s\n", sha1_to_hex(tree1->object.sha1),
  57                           sha1_to_hex(tree2->object.sha1));
  58         diff_tree_sha1(tree1->object.sha1, tree2->object.sha1,
  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         unsigned char sha1[20];
  68         struct object *obj;
  69
  70         if (!len || line[len-1] != '\n')
  71                 return -1;
  72         line[len-1] = 0;
  73         if (get_sha1_hex(line, sha1))
  74                 return -1;
  75         obj = lookup_unknown_object(sha1);
  76         if (!obj || !obj->parsed)
  77                 obj = parse_object(sha1);
  78         if (!obj)
  79                 return -1;
  80         if (obj->type == OBJ_COMMIT)
  81                 return stdin_diff_commit((struct commit *)obj, line, len);
  82         if (obj->type == OBJ_TREE)
  83                 return stdin_diff_trees((struct tree *)obj, line, len);
  84         error("Object %s is a %s, not a commit or tree",
  85               sha1_to_hex(sha1), typename(obj->type));
  86         return -1;
  87 }
  88
  89 static const char diff_tree_usage[] =
  90 "git diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
  91 "[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
  92 "  -r            diff recursively\n"
  93 "  --root        include the initial commit as diff against /dev/null\n"
  94 COMMON_DIFF_OPTIONS_HELP;
  95
  96 static void diff_tree_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
  97 {
  98         if (!rev->diffopt.output_format) {
  99                 if (rev->dense_combined_merges)
 100                         rev->diffopt.output_format = DIFF_FORMAT_PATCH;
 101                 else
 102                         rev->diffopt.output_format = DIFF_FORMAT_RAW;
 103         }
 104 }
 105
 106 int cmd_diff_tree(int argc, const char **argv, const char *prefix)
 107 {
 108         int nr_sha1;
 109         char line[1000];
 110         struct object *tree1, *tree2;
 111         static struct rev_info *opt = &log_tree_opt;
 112         struct setup_revision_opt s_r_opt;
 113         int read_stdin = 0;
 114
 115         init_revisions(opt, prefix);
 116         gitmodules_config();
 117         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
 118         opt->abbrev = 0;
 119         opt->diff = 1;
 120         opt->disable_stdin = 1;
 121         memset(&s_r_opt, 0, sizeof(s_r_opt));
 122         s_r_opt.tweak = diff_tree_tweak_rev;
 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 be equal to "a..b", so we
 137          * reverse the order of the objects if the second one
 138          * is marked UNINTERESTING.
 139          */
 140         nr_sha1 = opt->pending.nr;
 141         switch (nr_sha1) {
 142         case 0:
 143                 if (!read_stdin)
 144                         usage(diff_tree_usage);
 145                 break;
 146         case 1:
 147                 tree1 = opt->pending.objects[0].item;
 148                 diff_tree_commit_sha1(tree1->sha1);
 149                 break;
 150         case 2:
 151                 tree1 = opt->pending.objects[0].item;
 152                 tree2 = opt->pending.objects[1].item;
 153                 if (tree2->flags & UNINTERESTING) {
 154                         struct object *tmp = tree2;
 155                         tree2 = tree1;
 156                         tree1 = tmp;
 157                 }
 158                 diff_tree_sha1(tree1->sha1,
 159                                tree2->sha1,
 160                                "", &opt->diffopt);
 161                 log_tree_diff_flush(opt);
 162                 break;
 163         }
 164
 165         if (read_stdin) {
 166                 int saved_nrl = 0;
 167                 int saved_dcctc = 0;
 168
 169                 if (opt->diffopt.detect_rename)
 170                         opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 171                                                DIFF_SETUP_USE_CACHE);
 172                 while (fgets(line, sizeof(line), stdin)) {
 173                         unsigned char sha1[20];
 174
 175                         if (get_sha1_hex(line, sha1)) {
 176                                 fputs(line, stdout);
 177                                 fflush(stdout);
 178                         }
 179                         else {
 180                                 diff_tree_stdin(line);
 181                                 if (saved_nrl < opt->diffopt.needed_rename_limit)
 182                                         saved_nrl = opt->diffopt.needed_rename_limit;
 183                                 if (opt->diffopt.degraded_cc_to_c)
 184                                         saved_dcctc = 1;
 185                         }
 186                 }
 187                 opt->diffopt.degraded_cc_to_c = saved_dcctc;
 188                 opt->diffopt.needed_rename_limit = saved_nrl;
 189         }
 190
 191         return diff_result_code(&opt->diffopt, 0);
 192 }