diff-tree.c

   1 #include "cache.h"
   2 #include "diff.h"
   3 #include "commit.h"
   4 #include "log-tree.h"
   5
   6 static struct rev_info log_tree_opt;
   7
   8 static int diff_tree_commit_sha1(const unsigned char *sha1)
   9 {
  10         struct commit *commit = lookup_commit_reference(sha1);
  11         if (!commit)
  12                 return -1;
  13         return log_tree_commit(&log_tree_opt, commit);
  14 }
  15
  16 static int diff_tree_stdin(char *line)
  17 {
  18         int len = strlen(line);
  19         unsigned char sha1[20];
  20         struct commit *commit;
  21
  22         if (!len || line[len-1] != '\n')
  23                 return -1;
  24         line[len-1] = 0;
  25         if (get_sha1_hex(line, sha1))
  26                 return -1;
  27         commit = lookup_commit(sha1);
  28         if (!commit || parse_commit(commit))
  29                 return -1;
  30         if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
  31                 /* Graft the fake parents locally to the commit */
  32                 int pos = 41;
  33                 struct commit_list **pptr, *parents;
  34
  35                 /* Free the real parent list */
  36                 for (parents = commit->parents; parents; ) {
  37                         struct commit_list *tmp = parents->next;
  38                         free(parents);
  39                         parents = tmp;
  40                 }
  41                 commit->parents = NULL;
  42                 pptr = &(commit->parents);
  43                 while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
  44                         struct commit *parent = lookup_commit(sha1);
  45                         if (parent) {
  46                                 pptr = &commit_list_insert(parent, pptr)->next;
  47                         }
  48                         pos += 41;
  49                 }
  50         }
  51         return log_tree_commit(&log_tree_opt, commit);
  52 }
  53
  54 static const char diff_tree_usage[] =
  55 "git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
  56 "[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
  57 "  -r            diff recursively\n"
  58 "  --root        include the initial commit as diff against /dev/null\n"
  59 COMMON_DIFF_OPTIONS_HELP;
  60
  61 int main(int argc, const char **argv)
  62 {
  63         int nr_sha1;
  64         char line[1000];
  65         struct object *tree1, *tree2;
  66         static struct rev_info *opt = &log_tree_opt;
  67         struct object_list *list;
  68         int read_stdin = 0;
  69
  70         git_config(git_diff_config);
  71         nr_sha1 = 0;
  72         init_revisions(opt);
  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         /*
  88          * NOTE! "setup_revisions()" will have inserted the revisions
  89          * it parsed in reverse order. So if you do
  90          *
  91          *      git-diff-tree a b
  92          *
  93          * the commit list will be "b" -> "a" -> NULL, so we reverse
  94          * the order of the objects if the first one is not marked
  95          * UNINTERESTING.
  96          */
  97         nr_sha1 = 0;
  98         list = opt->pending_objects;
  99         if (list) {
 100                 nr_sha1++;
 101                 tree1 = list->item;
 102                 list = list->next;
 103                 if (list) {
 104                         nr_sha1++;
 105                         tree2 = tree1;
 106                         tree1 = list->item;
 107                         if (list->next)
 108                                 usage(diff_tree_usage);
 109                         /* Switch them around if the second one was uninteresting.. */
 110                         if (tree2->flags & UNINTERESTING) {
 111                                 struct object *tmp = tree2;
 112                                 tree2 = tree1;
 113                                 tree1 = tmp;
 114                         }
 115                 }
 116         }
 117
 118         switch (nr_sha1) {
 119         case 0:
 120                 if (!read_stdin)
 121                         usage(diff_tree_usage);
 122                 break;
 123         case 1:
 124                 diff_tree_commit_sha1(tree1->sha1);
 125                 break;
 126         case 2:
 127                 diff_tree_sha1(tree1->sha1,
 128                                tree2->sha1,
 129                                "", &opt->diffopt);
 130                 log_tree_diff_flush(opt);
 131                 break;
 132         }
 133
 134         if (!read_stdin)
 135                 return 0;
 136
 137         if (opt->diffopt.detect_rename)
 138                 opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 139                                        DIFF_SETUP_USE_CACHE);
 140         while (fgets(line, sizeof(line), stdin))
 141                 diff_tree_stdin(line);
 142
 143         return 0;
 144 }