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 int cmd_diff_tree(int argc, const char **argv, const char *prefix)
  96 {
  97         int nr_sha1;
  98         char line[1000];
  99         struct object *tree1, *tree2;
 100         static struct rev_info *opt = &log_tree_opt;
 101         int read_stdin = 0;
 102
 103         init_revisions(opt, prefix);
 104         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
 105         opt->abbrev = 0;
 106         opt->diff = 1;
 107         opt->disable_stdin = 1;
 108         argc = setup_revisions(argc, argv, opt, NULL);
 109
 110         while (--argc > 0) {
 111                 const char *arg = *++argv;
 112
 113                 if (!strcmp(arg, "--stdin")) {
 114                         read_stdin = 1;
 115                         continue;
 116                 }
 117                 usage(diff_tree_usage);
 118         }
 119
 120         if (!opt->diffopt.output_format)
 121                 opt->diffopt.output_format = DIFF_FORMAT_RAW;
 122
 123         /*
 124          * NOTE! We expect "a ^b" to be equal to "a..b", so we
 125          * reverse the order of the objects if the second one
 126          * is marked UNINTERESTING.
 127          */
 128         nr_sha1 = opt->pending.nr;
 129         switch (nr_sha1) {
 130         case 0:
 131                 if (!read_stdin)
 132                         usage(diff_tree_usage);
 133                 break;
 134         case 1:
 135                 tree1 = opt->pending.objects[0].item;
 136                 diff_tree_commit_sha1(tree1->sha1);
 137                 break;
 138         case 2:
 139                 tree1 = opt->pending.objects[0].item;
 140                 tree2 = opt->pending.objects[1].item;
 141                 if (tree2->flags & UNINTERESTING) {
 142                         struct object *tmp = tree2;
 143                         tree2 = tree1;
 144                         tree1 = tmp;
 145                 }
 146                 diff_tree_sha1(tree1->sha1,
 147                                tree2->sha1,
 148                                "", &opt->diffopt);
 149                 log_tree_diff_flush(opt);
 150                 break;
 151         }
 152
 153         if (read_stdin) {
 154                 if (opt->diffopt.detect_rename)
 155                         opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
 156                                                DIFF_SETUP_USE_CACHE);
 157                 while (fgets(line, sizeof(line), stdin)) {
 158                         unsigned char sha1[20];
 159
 160                         if (get_sha1_hex(line, sha1)) {
 161                                 fputs(line, stdout);
 162                                 fflush(stdout);
 163                         }
 164                         else
 165                                 diff_tree_stdin(line);
 166                 }
 167         }
 168
 169         return diff_result_code(&opt->diffopt, 0);
 170 }