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 static int diff_tree_stdin(char *line)
  18 {
  19         int len = strlen(line);
  20         unsigned char sha1[20];
  21         struct commit *commit;
  22
  23         if (!len || line[len-1] != '\n')
  24                 return -1;
  25         line[len-1] = 0;
  26         if (get_sha1_hex(line, sha1))
  27                 return -1;
  28         commit = lookup_commit(sha1);
  29         if (!commit || parse_commit(commit))
  30                 return -1;
  31         if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
  32                 /* Graft the fake parents locally to the commit */
  33                 int pos = 41;
  34                 struct commit_list **pptr, *parents;
  35
  36                 /* Free the real parent list */
  37                 for (parents = commit->parents; parents; ) {
  38                         struct commit_list *tmp = parents->next;
  39                         free(parents);
  40                         parents = tmp;
  41                 }
  42                 commit->parents = NULL;
  43                 pptr = &(commit->parents);
  44                 while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
  45                         struct commit *parent = lookup_commit(sha1);
  46                         if (parent) {
  47                                 pptr = &commit_list_insert(parent, pptr)->next;
  48                         }
  49                         pos += 41;
  50                 }
  51         }
  52         return log_tree_commit(&log_tree_opt, commit);
  53 }
  54
  55 static const char diff_tree_usage[] =
  56 "git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
  57 "[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
  58 "  -r            diff recursively\n"
  59 "  --root        include the initial commit as diff against /dev/null\n"
  60 COMMON_DIFF_OPTIONS_HELP;
  61
  62 int cmd_diff_tree(int argc, const char **argv, const char *prefix)
  63 {
  64         int nr_sha1;
  65         char line[1000];
  66         struct object *tree1, *tree2;
  67         static struct rev_info *opt = &log_tree_opt;
  68         int read_stdin = 0;
  69
  70         init_revisions(opt, prefix);
  71         git_config(git_default_config); /* no "diff" UI options */
  72         nr_sha1 = 0;
  73         opt->abbrev = 0;
  74         opt->diff = 1;
  75         argc = setup_revisions(argc, argv, opt, NULL);
  76
  77         while (--argc > 0) {
  78                 const char *arg = *++argv;
  79
  80                 if (!strcmp(arg, "--stdin")) {
  81                         read_stdin = 1;
  82                         continue;
  83                 }
  84                 usage(diff_tree_usage);
  85         }
  86
  87         if (!opt->diffopt.output_format)
  88                 opt->diffopt.output_format = DIFF_FORMAT_RAW;
  89
  90         /*
  91          * NOTE! We expect "a ^b" to be equal to "a..b", so we
  92          * reverse the order of the objects if the second one
  93          * is marked UNINTERESTING.
  94          */
  95         nr_sha1 = opt->pending.nr;
  96         switch (nr_sha1) {
  97         case 0:
  98                 if (!read_stdin)
  99                         usage(diff_tree_usage);
 100                 break;
 101         case 1:
 102                 tree1 = opt->pending.objects[0].item;
 103                 diff_tree_commit_sha1(tree1->sha1);
 104                 break;
 105         case 2:
 106                 tree1 = opt->pending.objects[0].item;
 107                 tree2 = opt->pending.objects[1].item;
 108                 if (tree2->flags & UNINTERESTING) {
 109                         struct object *tmp = tree2;
 110                         tree2 = tree1;
 111                         tree1 = tmp;
 112                 }
 113                 diff_tree_sha1(tree1->sha1,
 114                                tree2->sha1,
 115                                "", &opt->diffopt);
 116                 log_tree_diff_flush(opt);
 117                 break;
 118         }
 119
 120         if (!read_stdin)
 121                 return opt->diffopt.exit_with_status ?
 122                     opt->diffopt.has_changes: 0;
 123
 124         if (opt->diffopt.detect_rename)
 125                 opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 126                                        DIFF_SETUP_USE_CACHE);
 127         while (fgets(line, sizeof(line), stdin)) {
 128                 unsigned char sha1[20];
 129
 130                 if (get_sha1_hex(line, sha1)) {
 131                         fputs(line, stdout);
 132                         fflush(stdout);
 133                 }
 134                 else
 135                         diff_tree_stdin(line);
 136         }
 137         return opt->diffopt.exit_with_status ? opt->diffopt.has_changes: 0;
 138 }