Merge branch 'dk/reflog-walk-with-non-commit'
[git/git.git] / reflog-walk.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "refs.h"
4 #include "diff.h"
5 #include "revision.h"
6 #include "string-list.h"
7 #include "reflog-walk.h"
8
9 struct complete_reflogs {
10 char *ref;
11 const char *short_ref;
12 struct reflog_info {
13 unsigned char osha1[20], nsha1[20];
14 char *email;
15 unsigned long timestamp;
16 int tz;
17 char *message;
18 } *items;
19 int nr, alloc;
20 };
21
22 static int read_one_reflog(unsigned char *osha1, unsigned char *nsha1,
23 const char *email, unsigned long timestamp, int tz,
24 const char *message, void *cb_data)
25 {
26 struct complete_reflogs *array = cb_data;
27 struct reflog_info *item;
28
29 ALLOC_GROW(array->items, array->nr + 1, array->alloc);
30 item = array->items + array->nr;
31 hashcpy(item->osha1, osha1);
32 hashcpy(item->nsha1, nsha1);
33 item->email = xstrdup(email);
34 item->timestamp = timestamp;
35 item->tz = tz;
36 item->message = xstrdup(message);
37 array->nr++;
38 return 0;
39 }
40
41 static struct complete_reflogs *read_complete_reflog(const char *ref)
42 {
43 struct complete_reflogs *reflogs =
44 xcalloc(1, sizeof(struct complete_reflogs));
45 reflogs->ref = xstrdup(ref);
46 for_each_reflog_ent(ref, read_one_reflog, reflogs);
47 if (reflogs->nr == 0) {
48 unsigned char sha1[20];
49 const char *name;
50 void *name_to_free;
51 name = name_to_free = resolve_refdup(ref, RESOLVE_REF_READING,
52 sha1, NULL);
53 if (name) {
54 for_each_reflog_ent(name, read_one_reflog, reflogs);
55 free(name_to_free);
56 }
57 }
58 if (reflogs->nr == 0) {
59 char *refname = xstrfmt("refs/%s", ref);
60 for_each_reflog_ent(refname, read_one_reflog, reflogs);
61 if (reflogs->nr == 0) {
62 free(refname);
63 refname = xstrfmt("refs/heads/%s", ref);
64 for_each_reflog_ent(refname, read_one_reflog, reflogs);
65 }
66 free(refname);
67 }
68 return reflogs;
69 }
70
71 static int get_reflog_recno_by_time(struct complete_reflogs *array,
72 unsigned long timestamp)
73 {
74 int i;
75 for (i = array->nr - 1; i >= 0; i--)
76 if (timestamp >= array->items[i].timestamp)
77 return i;
78 return -1;
79 }
80
81 struct commit_info_lifo {
82 struct commit_info {
83 struct commit *commit;
84 void *util;
85 } *items;
86 int nr, alloc;
87 };
88
89 static struct commit_info *get_commit_info(struct commit *commit,
90 struct commit_info_lifo *lifo, int pop)
91 {
92 int i;
93 for (i = 0; i < lifo->nr; i++)
94 if (lifo->items[i].commit == commit) {
95 struct commit_info *result = &lifo->items[i];
96 if (pop) {
97 if (i + 1 < lifo->nr)
98 memmove(lifo->items + i,
99 lifo->items + i + 1,
100 (lifo->nr - i) *
101 sizeof(struct commit_info));
102 lifo->nr--;
103 }
104 return result;
105 }
106 return NULL;
107 }
108
109 static void add_commit_info(struct commit *commit, void *util,
110 struct commit_info_lifo *lifo)
111 {
112 struct commit_info *info;
113 ALLOC_GROW(lifo->items, lifo->nr + 1, lifo->alloc);
114 info = lifo->items + lifo->nr;
115 info->commit = commit;
116 info->util = util;
117 lifo->nr++;
118 }
119
120 struct commit_reflog {
121 int recno;
122 enum selector_type {
123 SELECTOR_NONE,
124 SELECTOR_INDEX,
125 SELECTOR_DATE
126 } selector;
127 struct complete_reflogs *reflogs;
128 };
129
130 struct reflog_walk_info {
131 struct commit_info_lifo reflogs;
132 struct string_list complete_reflogs;
133 struct commit_reflog *last_commit_reflog;
134 };
135
136 void init_reflog_walk(struct reflog_walk_info **info)
137 {
138 *info = xcalloc(1, sizeof(struct reflog_walk_info));
139 }
140
141 int add_reflog_for_walk(struct reflog_walk_info *info,
142 struct commit *commit, const char *name)
143 {
144 unsigned long timestamp = 0;
145 int recno = -1;
146 struct string_list_item *item;
147 struct complete_reflogs *reflogs;
148 char *branch, *at = strchr(name, '@');
149 struct commit_reflog *commit_reflog;
150 enum selector_type selector = SELECTOR_NONE;
151
152 if (commit->object.flags & UNINTERESTING)
153 die ("Cannot walk reflogs for %s", name);
154
155 branch = xstrdup(name);
156 if (at && at[1] == '{') {
157 char *ep;
158 branch[at - name] = '\0';
159 recno = strtoul(at + 2, &ep, 10);
160 if (*ep != '}') {
161 recno = -1;
162 timestamp = approxidate(at + 2);
163 selector = SELECTOR_DATE;
164 }
165 else
166 selector = SELECTOR_INDEX;
167 } else
168 recno = 0;
169
170 item = string_list_lookup(&info->complete_reflogs, branch);
171 if (item)
172 reflogs = item->util;
173 else {
174 if (*branch == '\0') {
175 unsigned char sha1[20];
176 free(branch);
177 branch = resolve_refdup("HEAD", 0, sha1, NULL);
178 if (!branch)
179 die ("No current branch");
180
181 }
182 reflogs = read_complete_reflog(branch);
183 if (!reflogs || reflogs->nr == 0) {
184 unsigned char sha1[20];
185 char *b;
186 if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
187 if (reflogs) {
188 free(reflogs->ref);
189 free(reflogs);
190 }
191 free(branch);
192 branch = b;
193 reflogs = read_complete_reflog(branch);
194 }
195 }
196 if (!reflogs || reflogs->nr == 0)
197 return -1;
198 string_list_insert(&info->complete_reflogs, branch)->util
199 = reflogs;
200 }
201
202 commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
203 if (recno < 0) {
204 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
205 if (commit_reflog->recno < 0) {
206 free(branch);
207 free(commit_reflog);
208 return -1;
209 }
210 } else
211 commit_reflog->recno = reflogs->nr - recno - 1;
212 commit_reflog->selector = selector;
213 commit_reflog->reflogs = reflogs;
214
215 add_commit_info(commit, commit_reflog, &info->reflogs);
216 return 0;
217 }
218
219 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
220 {
221 struct commit_info *commit_info =
222 get_commit_info(commit, &info->reflogs, 0);
223 struct commit_reflog *commit_reflog;
224 struct object *logobj;
225 struct reflog_info *reflog;
226
227 info->last_commit_reflog = NULL;
228 if (!commit_info)
229 return;
230
231 commit_reflog = commit_info->util;
232 if (commit_reflog->recno < 0) {
233 commit->parents = NULL;
234 return;
235 }
236 info->last_commit_reflog = commit_reflog;
237
238 do {
239 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
240 commit_reflog->recno--;
241 logobj = parse_object(reflog->osha1);
242 } while (commit_reflog->recno && (logobj && logobj->type != OBJ_COMMIT));
243
244 if (!logobj || logobj->type != OBJ_COMMIT) {
245 commit_info->commit = NULL;
246 commit->parents = NULL;
247 return;
248 }
249 commit_info->commit = (struct commit *)logobj;
250
251 commit->parents = xcalloc(1, sizeof(struct commit_list));
252 commit->parents->item = commit_info->commit;
253 }
254
255 void get_reflog_selector(struct strbuf *sb,
256 struct reflog_walk_info *reflog_info,
257 const struct date_mode *dmode, int force_date,
258 int shorten)
259 {
260 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
261 struct reflog_info *info;
262 const char *printed_ref;
263
264 if (!commit_reflog)
265 return;
266
267 if (shorten) {
268 if (!commit_reflog->reflogs->short_ref)
269 commit_reflog->reflogs->short_ref
270 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
271 printed_ref = commit_reflog->reflogs->short_ref;
272 } else {
273 printed_ref = commit_reflog->reflogs->ref;
274 }
275
276 strbuf_addf(sb, "%s@{", printed_ref);
277 if (commit_reflog->selector == SELECTOR_DATE ||
278 (commit_reflog->selector == SELECTOR_NONE && force_date)) {
279 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
280 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
281 } else {
282 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
283 - 2 - commit_reflog->recno);
284 }
285
286 strbuf_addch(sb, '}');
287 }
288
289 void get_reflog_message(struct strbuf *sb,
290 struct reflog_walk_info *reflog_info)
291 {
292 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
293 struct reflog_info *info;
294 size_t len;
295
296 if (!commit_reflog)
297 return;
298
299 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
300 len = strlen(info->message);
301 if (len > 0)
302 len--; /* strip away trailing newline */
303 strbuf_add(sb, info->message, len);
304 }
305
306 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
307 {
308 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
309 struct reflog_info *info;
310
311 if (!commit_reflog)
312 return NULL;
313
314 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
315 return info->email;
316 }
317
318 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
319 const struct date_mode *dmode, int force_date)
320 {
321 if (reflog_info && reflog_info->last_commit_reflog) {
322 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
323 struct reflog_info *info;
324 struct strbuf selector = STRBUF_INIT;
325
326 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
327 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
328 if (oneline) {
329 printf("%s: %s", selector.buf, info->message);
330 }
331 else {
332 printf("Reflog: %s (%s)\nReflog message: %s",
333 selector.buf, info->email, info->message);
334 }
335
336 strbuf_release(&selector);
337 }
338 }