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[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 }