Merge branch 'fix'
[git/git.git] / 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 }