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, char **envp)
  63 {
  64         int nr_sha1;
  65         char line[1000];
  66         struct object *tree1, *tree2;
  67         static struct rev_info *opt = &log_tree_opt;
  68         struct object_list *list;
  69         int read_stdin = 0;
  70
  71         git_config(git_diff_config);
  72         nr_sha1 = 0;
  73         init_revisions(opt);
  74         opt->abbrev = 0;
  75         opt->diff = 1;
  76         argc = setup_revisions(argc, argv, opt, NULL);
  77
  78         while (--argc > 0) {
  79                 const char *arg = *++argv;
  80
  81                 if (!strcmp(arg, "--stdin")) {
  82                         read_stdin = 1;
  83                         continue;
  84                 }
  85                 usage(diff_tree_usage);
  86         }
  87
  88         /*
  89          * NOTE! "setup_revisions()" will have inserted the revisions
  90          * it parsed in reverse order. So if you do
  91          *
  92          *      git-diff-tree a b
  93          *
  94          * the commit list will be "b" -> "a" -> NULL, so we reverse
  95          * the order of the objects if the first one is not marked
  96          * UNINTERESTING.
  97          */
  98         nr_sha1 = 0;
  99         list = opt->pending_objects;
 100         if (list) {
 101                 nr_sha1++;
 102                 tree1 = list->item;
 103                 list = list->next;
 104                 if (list) {
 105                         nr_sha1++;
 106                         tree2 = tree1;
 107                         tree1 = list->item;
 108                         if (list->next)
 109                                 usage(diff_tree_usage);
 110                         /* Switch them around if the second one was uninteresting.. */
 111                         if (tree2->flags & UNINTERESTING) {
 112                                 struct object *tmp = tree2;
 113                                 tree2 = tree1;
 114                                 tree1 = tmp;
 115                         }
 116                 }
 117         }
 118
 119         switch (nr_sha1) {
 120         case 0:
 121                 if (!read_stdin)
 122                         usage(diff_tree_usage);
 123                 break;
 124         case 1:
 125                 diff_tree_commit_sha1(tree1->sha1);
 126                 break;
 127         case 2:
 128                 diff_tree_sha1(tree1->sha1,
 129                                tree2->sha1,
 130                                "", &opt->diffopt);
 131                 log_tree_diff_flush(opt);
 132                 break;
 133         }
 134
 135         if (!read_stdin)
 136                 return 0;
 137
 138         if (opt->diffopt.detect_rename)
 139                 opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 140                                        DIFF_SETUP_USE_CACHE);
 141         while (fgets(line, sizeof(line), stdin))
 142                 if (line[0] == '\n')
 143                         fflush(stdout);
 144                 else
 145                         diff_tree_stdin(line);
 146
 147         return 0;
 148 }