Merge branch 'em/checkout-orphan'
[git] / builtin / fmt-merge-msg.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "commit.h"
4 #include "diff.h"
5 #include "revision.h"
6 #include "tag.h"
7 #include "string-list.h"
8
9 static const char * const fmt_merge_msg_usage[] = {
10         "git fmt-merge-msg [--log|--no-log] [--file <file>]",
11         NULL
12 };
13
14 static int merge_summary;
15
16 static int fmt_merge_msg_config(const char *key, const char *value, void *cb)
17 {
18         static int found_merge_log = 0;
19         if (!strcmp("merge.log", key)) {
20                 found_merge_log = 1;
21                 merge_summary = git_config_bool(key, value);
22         }
23         if (!found_merge_log && !strcmp("merge.summary", key))
24                 merge_summary = git_config_bool(key, value);
25         return 0;
26 }
27
28 struct src_data {
29         struct string_list branch, tag, r_branch, generic;
30         int head_status;
31 };
32
33 void init_src_data(struct src_data *data)
34 {
35         data->branch.strdup_strings = 1;
36         data->tag.strdup_strings = 1;
37         data->r_branch.strdup_strings = 1;
38         data->generic.strdup_strings = 1;
39 }
40
41 static struct string_list srcs = { NULL, 0, 0, 1 };
42 static struct string_list origins = { NULL, 0, 0, 1 };
43
44 static int handle_line(char *line)
45 {
46         int i, len = strlen(line);
47         unsigned char *sha1;
48         char *src, *origin;
49         struct src_data *src_data;
50         struct string_list_item *item;
51         int pulling_head = 0;
52
53         if (len < 43 || line[40] != '\t')
54                 return 1;
55
56         if (!prefixcmp(line + 41, "not-for-merge"))
57                 return 0;
58
59         if (line[41] != '\t')
60                 return 2;
61
62         line[40] = 0;
63         sha1 = xmalloc(20);
64         i = get_sha1(line, sha1);
65         line[40] = '\t';
66         if (i)
67                 return 3;
68
69         if (line[len - 1] == '\n')
70                 line[len - 1] = 0;
71         line += 42;
72
73         src = strstr(line, " of ");
74         if (src) {
75                 *src = 0;
76                 src += 4;
77                 pulling_head = 0;
78         } else {
79                 src = line;
80                 pulling_head = 1;
81         }
82
83         item = unsorted_string_list_lookup(&srcs, src);
84         if (!item) {
85                 item = string_list_append(src, &srcs);
86                 item->util = xcalloc(1, sizeof(struct src_data));
87                 init_src_data(item->util);
88         }
89         src_data = item->util;
90
91         if (pulling_head) {
92                 origin = src;
93                 src_data->head_status |= 1;
94         } else if (!prefixcmp(line, "branch ")) {
95                 origin = line + 7;
96                 string_list_append(origin, &src_data->branch);
97                 src_data->head_status |= 2;
98         } else if (!prefixcmp(line, "tag ")) {
99                 origin = line;
100                 string_list_append(origin + 4, &src_data->tag);
101                 src_data->head_status |= 2;
102         } else if (!prefixcmp(line, "remote branch ")) {
103                 origin = line + 14;
104                 string_list_append(origin, &src_data->r_branch);
105                 src_data->head_status |= 2;
106         } else {
107                 origin = src;
108                 string_list_append(line, &src_data->generic);
109                 src_data->head_status |= 2;
110         }
111
112         if (!strcmp(".", src) || !strcmp(src, origin)) {
113                 int len = strlen(origin);
114                 if (origin[0] == '\'' && origin[len - 1] == '\'')
115                         origin = xmemdupz(origin + 1, len - 2);
116         } else {
117                 char *new_origin = xmalloc(strlen(origin) + strlen(src) + 5);
118                 sprintf(new_origin, "%s of %s", origin, src);
119                 origin = new_origin;
120         }
121         string_list_append(origin, &origins)->util = sha1;
122         return 0;
123 }
124
125 static void print_joined(const char *singular, const char *plural,
126                 struct string_list *list, struct strbuf *out)
127 {
128         if (list->nr == 0)
129                 return;
130         if (list->nr == 1) {
131                 strbuf_addf(out, "%s%s", singular, list->items[0].string);
132         } else {
133                 int i;
134                 strbuf_addstr(out, plural);
135                 for (i = 0; i < list->nr - 1; i++)
136                         strbuf_addf(out, "%s%s", i > 0 ? ", " : "",
137                                     list->items[i].string);
138                 strbuf_addf(out, " and %s", list->items[list->nr - 1].string);
139         }
140 }
141
142 static void shortlog(const char *name, unsigned char *sha1,
143                 struct commit *head, struct rev_info *rev, int limit,
144                 struct strbuf *out)
145 {
146         int i, count = 0;
147         struct commit *commit;
148         struct object *branch;
149         struct string_list subjects = { NULL, 0, 0, 1 };
150         int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;
151         struct strbuf sb = STRBUF_INIT;
152
153         branch = deref_tag(parse_object(sha1), sha1_to_hex(sha1), 40);
154         if (!branch || branch->type != OBJ_COMMIT)
155                 return;
156
157         setup_revisions(0, NULL, rev, NULL);
158         rev->ignore_merges = 1;
159         add_pending_object(rev, branch, name);
160         add_pending_object(rev, &head->object, "^HEAD");
161         head->object.flags |= UNINTERESTING;
162         if (prepare_revision_walk(rev))
163                 die("revision walk setup failed");
164         while ((commit = get_revision(rev)) != NULL) {
165                 struct pretty_print_context ctx = {0};
166
167                 /* ignore merges */
168                 if (commit->parents && commit->parents->next)
169                         continue;
170
171                 count++;
172                 if (subjects.nr > limit)
173                         continue;
174
175                 format_commit_message(commit, "%s", &sb, &ctx);
176                 strbuf_ltrim(&sb);
177
178                 if (!sb.len)
179                         string_list_append(sha1_to_hex(commit->object.sha1),
180                                            &subjects);
181                 else
182                         string_list_append(strbuf_detach(&sb, NULL), &subjects);
183         }
184
185         if (count > limit)
186                 strbuf_addf(out, "\n* %s: (%d commits)\n", name, count);
187         else
188                 strbuf_addf(out, "\n* %s:\n", name);
189
190         for (i = 0; i < subjects.nr; i++)
191                 if (i >= limit)
192                         strbuf_addf(out, "  ...\n");
193                 else
194                         strbuf_addf(out, "  %s\n", subjects.items[i].string);
195
196         clear_commit_marks((struct commit *)branch, flags);
197         clear_commit_marks(head, flags);
198         free_commit_list(rev->commits);
199         rev->commits = NULL;
200         rev->pending.nr = 0;
201
202         string_list_clear(&subjects, 0);
203 }
204
205 static void do_fmt_merge_msg_title(struct strbuf *out,
206         const char *current_branch) {
207         int i = 0;
208         char *sep = "";
209
210         strbuf_addstr(out, "Merge ");
211         for (i = 0; i < srcs.nr; i++) {
212                 struct src_data *src_data = srcs.items[i].util;
213                 const char *subsep = "";
214
215                 strbuf_addstr(out, sep);
216                 sep = "; ";
217
218                 if (src_data->head_status == 1) {
219                         strbuf_addstr(out, srcs.items[i].string);
220                         continue;
221                 }
222                 if (src_data->head_status == 3) {
223                         subsep = ", ";
224                         strbuf_addstr(out, "HEAD");
225                 }
226                 if (src_data->branch.nr) {
227                         strbuf_addstr(out, subsep);
228                         subsep = ", ";
229                         print_joined("branch ", "branches ", &src_data->branch,
230                                         out);
231                 }
232                 if (src_data->r_branch.nr) {
233                         strbuf_addstr(out, subsep);
234                         subsep = ", ";
235                         print_joined("remote branch ", "remote branches ",
236                                         &src_data->r_branch, out);
237                 }
238                 if (src_data->tag.nr) {
239                         strbuf_addstr(out, subsep);
240                         subsep = ", ";
241                         print_joined("tag ", "tags ", &src_data->tag, out);
242                 }
243                 if (src_data->generic.nr) {
244                         strbuf_addstr(out, subsep);
245                         print_joined("commit ", "commits ", &src_data->generic,
246                                         out);
247                 }
248                 if (strcmp(".", srcs.items[i].string))
249                         strbuf_addf(out, " of %s", srcs.items[i].string);
250         }
251
252         if (!strcmp("master", current_branch))
253                 strbuf_addch(out, '\n');
254         else
255                 strbuf_addf(out, " into %s\n", current_branch);
256 }
257
258 static int do_fmt_merge_msg(int merge_title, int merge_summary,
259         struct strbuf *in, struct strbuf *out) {
260         int limit = 20, i = 0, pos = 0;
261         unsigned char head_sha1[20];
262         const char *current_branch;
263
264         /* get current branch */
265         current_branch = resolve_ref("HEAD", head_sha1, 1, NULL);
266         if (!current_branch)
267                 die("No current branch");
268         if (!prefixcmp(current_branch, "refs/heads/"))
269                 current_branch += 11;
270
271         /* get a line */
272         while (pos < in->len) {
273                 int len;
274                 char *newline, *p = in->buf + pos;
275
276                 newline = strchr(p, '\n');
277                 len = newline ? newline - p : strlen(p);
278                 pos += len + !!newline;
279                 i++;
280                 p[len] = 0;
281                 if (handle_line(p))
282                         die ("Error in line %d: %.*s", i, len, p);
283         }
284
285         if (!srcs.nr)
286                 return 0;
287
288         if (merge_title)
289                 do_fmt_merge_msg_title(out, current_branch);
290
291         if (merge_summary) {
292                 struct commit *head;
293                 struct rev_info rev;
294
295                 head = lookup_commit(head_sha1);
296                 init_revisions(&rev, NULL);
297                 rev.commit_format = CMIT_FMT_ONELINE;
298                 rev.ignore_merges = 1;
299                 rev.limited = 1;
300
301                 if (suffixcmp(out->buf, "\n"))
302                         strbuf_addch(out, '\n');
303
304                 for (i = 0; i < origins.nr; i++)
305                         shortlog(origins.items[i].string, origins.items[i].util,
306                                         head, &rev, limit, out);
307         }
308         return 0;
309 }
310
311 int fmt_merge_msg(int merge_summary, struct strbuf *in, struct strbuf *out) {
312         return do_fmt_merge_msg(1, merge_summary, in, out);
313 }
314
315 int fmt_merge_msg_shortlog(struct strbuf *in, struct strbuf *out) {
316         return do_fmt_merge_msg(0, 1, in, out);
317 }
318
319 int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
320 {
321         const char *inpath = NULL;
322         struct option options[] = {
323                 OPT_BOOLEAN(0, "log",     &merge_summary, "populate log with the shortlog"),
324                 { OPTION_BOOLEAN, 0, "summary", &merge_summary, NULL,
325                   "alias for --log (deprecated)",
326                   PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
327                 OPT_FILENAME('F', "file", &inpath, "file to read from"),
328                 OPT_END()
329         };
330
331         FILE *in = stdin;
332         struct strbuf input = STRBUF_INIT, output = STRBUF_INIT;
333         int ret;
334
335         git_config(fmt_merge_msg_config, NULL);
336         argc = parse_options(argc, argv, prefix, options, fmt_merge_msg_usage,
337                              0);
338         if (argc > 0)
339                 usage_with_options(fmt_merge_msg_usage, options);
340
341         if (inpath && strcmp(inpath, "-")) {
342                 in = fopen(inpath, "r");
343                 if (!in)
344                         die_errno("cannot open '%s'", inpath);
345         }
346
347         if (strbuf_read(&input, fileno(in), 0) < 0)
348                 die_errno("could not read input file");
349         ret = fmt_merge_msg(merge_summary, &input, &output);
350         if (ret)
351                 return ret;
352         write_in_full(STDOUT_FILENO, output.buf, output.len);
353         return 0;
354 }