Merge branch 'bc/hash-transition-part-15'
[git] / builtin / diff-tree.c
1 #include "cache.h"
2 #include "config.h"
3 #include "diff.h"
4 #include "commit.h"
5 #include "log-tree.h"
6 #include "builtin.h"
7 #include "submodule.h"
8 #include "repository.h"
9
10 static struct rev_info log_tree_opt;
11
12 static int diff_tree_commit_oid(const struct object_id *oid)
13 {
14         struct commit *commit = lookup_commit_reference(the_repository, oid);
15         if (!commit)
16                 return -1;
17         return log_tree_commit(&log_tree_opt, commit);
18 }
19
20 /* Diff one or more commits. */
21 static int stdin_diff_commit(struct commit *commit, const char *p)
22 {
23         struct object_id oid;
24         struct commit_list **pptr = NULL;
25
26         /* Graft the fake parents locally to the commit */
27         while (isspace(*p++) && !parse_oid_hex(p, &oid, &p)) {
28                 struct commit *parent = lookup_commit(the_repository, &oid);
29                 if (!pptr) {
30                         /* Free the real parent list */
31                         free_commit_list(commit->parents);
32                         commit->parents = NULL;
33                         pptr = &(commit->parents);
34                 }
35                 if (parent) {
36                         pptr = &commit_list_insert(parent, pptr)->next;
37                 }
38         }
39         return log_tree_commit(&log_tree_opt, commit);
40 }
41
42 /* Diff two trees. */
43 static int stdin_diff_trees(struct tree *tree1, const char *p)
44 {
45         struct object_id oid;
46         struct tree *tree2;
47         if (!isspace(*p++) || parse_oid_hex(p, &oid, &p) || *p)
48                 return error("Need exactly two trees, separated by a space");
49         tree2 = lookup_tree(the_repository, &oid);
50         if (!tree2 || parse_tree(tree2))
51                 return -1;
52         printf("%s %s\n", oid_to_hex(&tree1->object.oid),
53                           oid_to_hex(&tree2->object.oid));
54         diff_tree_oid(&tree1->object.oid, &tree2->object.oid,
55                       "", &log_tree_opt.diffopt);
56         log_tree_diff_flush(&log_tree_opt);
57         return 0;
58 }
59
60 static int diff_tree_stdin(char *line)
61 {
62         int len = strlen(line);
63         struct object_id oid;
64         struct object *obj;
65         const char *p;
66
67         if (!len || line[len-1] != '\n')
68                 return -1;
69         line[len-1] = 0;
70         if (parse_oid_hex(line, &oid, &p))
71                 return -1;
72         obj = parse_object(the_repository, &oid);
73         if (!obj)
74                 return -1;
75         if (obj->type == OBJ_COMMIT)
76                 return stdin_diff_commit((struct commit *)obj, p);
77         if (obj->type == OBJ_TREE)
78                 return stdin_diff_trees((struct tree *)obj, p);
79         error("Object %s is a %s, not a commit or tree",
80               oid_to_hex(&oid), type_name(obj->type));
81         return -1;
82 }
83
84 static const char diff_tree_usage[] =
85 "git diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
86 "[<common-diff-options>] <tree-ish> [<tree-ish>] [<path>...]\n"
87 "  -r            diff recursively\n"
88 "  --root        include the initial commit as diff against /dev/null\n"
89 COMMON_DIFF_OPTIONS_HELP;
90
91 static void diff_tree_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
92 {
93         if (!rev->diffopt.output_format) {
94                 if (rev->dense_combined_merges)
95                         rev->diffopt.output_format = DIFF_FORMAT_PATCH;
96                 else
97                         rev->diffopt.output_format = DIFF_FORMAT_RAW;
98         }
99 }
100
101 int cmd_diff_tree(int argc, const char **argv, const char *prefix)
102 {
103         char line[1000];
104         struct object *tree1, *tree2;
105         static struct rev_info *opt = &log_tree_opt;
106         struct setup_revision_opt s_r_opt;
107         int read_stdin = 0;
108
109         if (argc == 2 && !strcmp(argv[1], "-h"))
110                 usage(diff_tree_usage);
111
112         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
113         repo_init_revisions(the_repository, opt, prefix);
114         if (read_cache() < 0)
115                 die(_("index file corrupt"));
116         opt->abbrev = 0;
117         opt->diff = 1;
118         opt->disable_stdin = 1;
119         memset(&s_r_opt, 0, sizeof(s_r_opt));
120         s_r_opt.tweak = diff_tree_tweak_rev;
121
122         precompose_argv(argc, argv);
123         argc = setup_revisions(argc, argv, opt, &s_r_opt);
124
125         while (--argc > 0) {
126                 const char *arg = *++argv;
127
128                 if (!strcmp(arg, "--stdin")) {
129                         read_stdin = 1;
130                         continue;
131                 }
132                 usage(diff_tree_usage);
133         }
134
135         /*
136          * NOTE!  We expect "a..b" to expand to "^a b" but it is
137          * perfectly valid for revision range parser to yield "b ^a",
138          * which means the same thing. If we get the latter, i.e. the
139          * second one is marked UNINTERESTING, we recover the original
140          * order the user gave, i.e. "a..b", by swapping the trees.
141          */
142         switch (opt->pending.nr) {
143         case 0:
144                 if (!read_stdin)
145                         usage(diff_tree_usage);
146                 break;
147         case 1:
148                 tree1 = opt->pending.objects[0].item;
149                 diff_tree_commit_oid(&tree1->oid);
150                 break;
151         case 2:
152                 tree1 = opt->pending.objects[0].item;
153                 tree2 = opt->pending.objects[1].item;
154                 if (tree2->flags & UNINTERESTING) {
155                         SWAP(tree2, tree1);
156                 }
157                 diff_tree_oid(&tree1->oid, &tree2->oid, "", &opt->diffopt);
158                 log_tree_diff_flush(opt);
159                 break;
160         }
161
162         if (read_stdin) {
163                 int saved_nrl = 0;
164                 int saved_dcctc = 0;
165
166                 if (opt->diffopt.detect_rename) {
167                         if (!the_index.cache)
168                                 read_index(&the_index);
169                         opt->diffopt.setup |= DIFF_SETUP_USE_SIZE_CACHE;
170                 }
171                 while (fgets(line, sizeof(line), stdin)) {
172                         struct object_id oid;
173
174                         if (get_oid_hex(line, &oid)) {
175                                 fputs(line, stdout);
176                                 fflush(stdout);
177                         }
178                         else {
179                                 diff_tree_stdin(line);
180                                 if (saved_nrl < opt->diffopt.needed_rename_limit)
181                                         saved_nrl = opt->diffopt.needed_rename_limit;
182                                 if (opt->diffopt.degraded_cc_to_c)
183                                         saved_dcctc = 1;
184                         }
185                 }
186                 opt->diffopt.degraded_cc_to_c = saved_dcctc;
187                 opt->diffopt.needed_rename_limit = saved_nrl;
188         }
189
190         return diff_result_code(&opt->diffopt, 0);
191 }