mailinfo: iconv does not like "latin-1" -- should spell it "latin1"
[git.git] / diff-tree.c
1 #include "cache.h"
2 #include "diff.h"
3 #include "commit.h"
4
5 static int show_root_diff = 0;
6 static int no_commit_id = 0;
7 static int verbose_header = 0;
8 static int ignore_merges = 1;
9 static int read_stdin = 0;
10
11 static const char *header = NULL;
12 static const char *header_prefix = "";
13 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
14
15 static struct diff_options diff_options;
16
17 static int call_diff_flush(void)
18 {
19         diffcore_std(&diff_options);
20         if (diff_queue_is_empty()) {
21                 int saved_fmt = diff_options.output_format;
22                 diff_options.output_format = DIFF_FORMAT_NO_OUTPUT;
23                 diff_flush(&diff_options);
24                 diff_options.output_format = saved_fmt;
25                 return 0;
26         }
27         if (header) {
28                 if (!no_commit_id)
29                         printf("%s%c", header, diff_options.line_termination);
30                 header = NULL;
31         }
32         diff_flush(&diff_options);
33         return 1;
34 }
35
36 static int diff_tree_sha1_top(const unsigned char *old,
37                               const unsigned char *new, const char *base)
38 {
39         int ret;
40
41         ret = diff_tree_sha1(old, new, base, &diff_options);
42         call_diff_flush();
43         return ret;
44 }
45
46 static int diff_root_tree(const unsigned char *new, const char *base)
47 {
48         int retval;
49         void *tree;
50         struct tree_desc empty, real;
51
52         tree = read_object_with_reference(new, "tree", &real.size, NULL);
53         if (!tree)
54                 die("unable to read root tree (%s)", sha1_to_hex(new));
55         real.buf = tree;
56
57         empty.buf = "";
58         empty.size = 0;
59         retval = diff_tree(&empty, &real, base, &diff_options);
60         free(tree);
61         call_diff_flush();
62         return retval;
63 }
64
65 static const char *generate_header(const unsigned char *commit_sha1,
66                                    const unsigned char *parent_sha1,
67                                    const char *msg)
68 {
69         static char this_header[16384];
70         int offset;
71         unsigned long len;
72         int abbrev = diff_options.abbrev;
73
74         if (!verbose_header)
75                 return sha1_to_hex(commit_sha1);
76
77         len = strlen(msg);
78
79         offset = sprintf(this_header, "%s%s ",
80                          header_prefix,
81                          diff_unique_abbrev(commit_sha1, abbrev));
82         offset += sprintf(this_header + offset, "(from %s)\n",
83                          parent_sha1 ?
84                          diff_unique_abbrev(parent_sha1, abbrev) : "root");
85         offset += pretty_print_commit(commit_format, msg, len,
86                                       this_header + offset,
87                                       sizeof(this_header) - offset);
88         return this_header;
89 }
90
91 static int diff_tree_commit(const unsigned char *commit_sha1)
92 {
93         struct commit *commit;
94         struct commit_list *parents;
95         char name[50];
96         unsigned char sha1[20];
97
98         sprintf(name, "%s^0", sha1_to_hex(commit_sha1));
99         if (get_sha1(name, sha1))
100                 return -1;
101         name[40] = 0;
102         commit = lookup_commit(sha1);
103         
104         /* Root commit? */
105         if (show_root_diff && !commit->parents) {
106                 header = generate_header(sha1, NULL, commit->buffer);
107                 diff_root_tree(commit_sha1, "");
108         }
109
110         /* More than one parent? */
111         if (ignore_merges && commit->parents && commit->parents->next)
112                 return 0;
113
114         for (parents = commit->parents; parents; parents = parents->next) {
115                 struct commit *parent = parents->item;
116                 header = generate_header(sha1,
117                                          parent->object.sha1,
118                                          commit->buffer);
119                 diff_tree_sha1_top(parent->object.sha1, commit_sha1, "");
120                 if (!header && verbose_header) {
121                         header_prefix = "\ndiff-tree ";
122                         /*
123                          * Don't print multiple merge entries if we
124                          * don't print the diffs.
125                          */
126                 }
127         }
128         return 0;
129 }
130
131 static int diff_tree_stdin(char *line)
132 {
133         int len = strlen(line);
134         unsigned char commit[20], parent[20];
135         static char this_header[1000];
136         int abbrev = diff_options.abbrev;
137
138         if (!len || line[len-1] != '\n')
139                 return -1;
140         line[len-1] = 0;
141         if (get_sha1_hex(line, commit))
142                 return -1;
143         if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
144                 line[40] = 0;
145                 line[81] = 0;
146                 sprintf(this_header, "%s (from %s)\n",
147                         diff_unique_abbrev(commit, abbrev),
148                         diff_unique_abbrev(parent, abbrev));
149                 header = this_header;
150                 return diff_tree_sha1_top(parent, commit, "");
151         }
152         line[40] = 0;
153         return diff_tree_commit(commit);
154 }
155
156 static const char diff_tree_usage[] =
157 "git-diff-tree [--stdin] [-m] [-s] [-v] [--pretty] [-t] [-r] [--root] "
158 "[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
159 "  -r            diff recursively\n"
160 "  --root        include the initial commit as diff against /dev/null\n"
161 COMMON_DIFF_OPTIONS_HELP;
162
163 int main(int argc, const char **argv)
164 {
165         int nr_sha1;
166         char line[1000];
167         unsigned char sha1[2][20];
168         const char *prefix = setup_git_directory();
169
170         git_config(git_diff_config);
171         nr_sha1 = 0;
172         diff_setup(&diff_options);
173
174         for (;;) {
175                 int diff_opt_cnt;
176                 const char *arg;
177
178                 argv++;
179                 argc--;
180                 arg = *argv;
181                 if (!arg)
182                         break;
183
184                 if (*arg != '-') {
185                         if (nr_sha1 < 2 && !get_sha1(arg, sha1[nr_sha1])) {
186                                 nr_sha1++;
187                                 continue;
188                         }
189                         break;
190                 }
191
192                 diff_opt_cnt = diff_opt_parse(&diff_options, argv, argc);
193                 if (diff_opt_cnt < 0)
194                         usage(diff_tree_usage);
195                 else if (diff_opt_cnt) {
196                         argv += diff_opt_cnt - 1;
197                         argc -= diff_opt_cnt - 1;
198                         continue;
199                 }
200
201
202                 if (!strcmp(arg, "--")) {
203                         argv++;
204                         argc--;
205                         break;
206                 }
207                 if (!strcmp(arg, "-r")) {
208                         diff_options.recursive = 1;
209                         continue;
210                 }
211                 if (!strcmp(arg, "-t")) {
212                         diff_options.recursive = 1;
213                         diff_options.tree_in_recursive = 1;
214                         continue;
215                 }
216                 if (!strcmp(arg, "-m")) {
217                         ignore_merges = 0;
218                         continue;
219                 }
220                 if (!strcmp(arg, "-v")) {
221                         verbose_header = 1;
222                         header_prefix = "diff-tree ";
223                         continue;
224                 }
225                 if (!strncmp(arg, "--pretty", 8)) {
226                         verbose_header = 1;
227                         header_prefix = "diff-tree ";
228                         commit_format = get_commit_format(arg+8);
229                         continue;
230                 }
231                 if (!strcmp(arg, "--stdin")) {
232                         read_stdin = 1;
233                         continue;
234                 }
235                 if (!strcmp(arg, "--root")) {
236                         show_root_diff = 1;
237                         continue;
238                 }
239                 if (!strcmp(arg, "--no-commit-id")) {
240                         no_commit_id = 1;
241                         continue;
242                 }
243                 usage(diff_tree_usage);
244         }
245         if (diff_options.output_format == DIFF_FORMAT_PATCH)
246                 diff_options.recursive = 1;
247
248         diff_tree_setup_paths(get_pathspec(prefix, argv));
249         diff_setup_done(&diff_options);
250
251         switch (nr_sha1) {
252         case 0:
253                 if (!read_stdin)
254                         usage(diff_tree_usage);
255                 break;
256         case 1:
257                 diff_tree_commit(sha1[0]);
258                 break;
259         case 2:
260                 diff_tree_sha1_top(sha1[0], sha1[1], "");
261                 break;
262         }
263
264         if (!read_stdin)
265                 return 0;
266
267         if (diff_options.detect_rename)
268                 diff_options.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
269                                        DIFF_SETUP_USE_CACHE);
270         while (fgets(line, sizeof(line), stdin))
271                 diff_tree_stdin(line);
272
273         return 0;
274 }