Merge branch 'ad/pull-remote-doc'
[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                 struct object_id ooid, noid;
14                 char *email;
15                 timestamp_t timestamp;
16                 int tz;
17                 char *message;
18         } *items;
19         int nr, alloc;
20 };
21
22 static int read_one_reflog(struct object_id *ooid, struct object_id *noid,
23                 const char *email, timestamp_t 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         oidcpy(&item->ooid, ooid);
32         oidcpy(&item->noid, noid);
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                 struct object_id oid;
49                 const char *name;
50                 void *name_to_free;
51                 name = name_to_free = resolve_refdup(ref, RESOLVE_REF_READING,
52                                                      oid.hash, 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         timestamp_t 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         timestamp_t 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                         struct object_id oid;
176                         free(branch);
177                         branch = resolve_refdup("HEAD", 0, oid.hash, NULL);
178                         if (!branch)
179                                 die ("No current branch");
180
181                 }
182                 reflogs = read_complete_reflog(branch);
183                 if (!reflogs || reflogs->nr == 0) {
184                         struct object_id oid;
185                         char *b;
186                         int ret = dwim_log(branch, strlen(branch),
187                                            oid.hash, &b);
188                         if (ret > 1)
189                                 free(b);
190                         else if (ret == 1) {
191                                 if (reflogs) {
192                                         free(reflogs->ref);
193                                         free(reflogs);
194                                 }
195                                 free(branch);
196                                 branch = b;
197                                 reflogs = read_complete_reflog(branch);
198                         }
199                 }
200                 if (!reflogs || reflogs->nr == 0) {
201                         if (reflogs) {
202                                 free(reflogs->ref);
203                                 free(reflogs);
204                         }
205                         free(branch);
206                         return -1;
207                 }
208                 string_list_insert(&info->complete_reflogs, branch)->util
209                         = reflogs;
210         }
211         free(branch);
212
213         commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
214         if (recno < 0) {
215                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
216                 if (commit_reflog->recno < 0) {
217                         if (reflogs) {
218                                 free(reflogs->ref);
219                                 free(reflogs);
220                         }
221                         free(commit_reflog);
222                         return -1;
223                 }
224         } else
225                 commit_reflog->recno = reflogs->nr - recno - 1;
226         commit_reflog->selector = selector;
227         commit_reflog->reflogs = reflogs;
228
229         add_commit_info(commit, commit_reflog, &info->reflogs);
230         return 0;
231 }
232
233 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
234 {
235         struct commit_info *commit_info =
236                 get_commit_info(commit, &info->reflogs, 0);
237         struct commit_reflog *commit_reflog;
238         struct object *logobj;
239         struct reflog_info *reflog;
240
241         info->last_commit_reflog = NULL;
242         if (!commit_info)
243                 return;
244
245         commit_reflog = commit_info->util;
246         if (commit_reflog->recno < 0) {
247                 commit->parents = NULL;
248                 return;
249         }
250         info->last_commit_reflog = commit_reflog;
251
252         do {
253                 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
254                 commit_reflog->recno--;
255                 logobj = parse_object(&reflog->ooid);
256         } while (commit_reflog->recno && (logobj && logobj->type != OBJ_COMMIT));
257
258         if (!logobj && commit_reflog->recno >= 0 && is_null_oid(&reflog->ooid)) {
259                 /* a root commit, but there are still more entries to show */
260                 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
261                 logobj = parse_object(&reflog->noid);
262         }
263
264         if (!logobj || logobj->type != OBJ_COMMIT) {
265                 commit_info->commit = NULL;
266                 commit->parents = NULL;
267                 return;
268         }
269         commit_info->commit = (struct commit *)logobj;
270
271         commit->parents = xcalloc(1, sizeof(struct commit_list));
272         commit->parents->item = commit_info->commit;
273 }
274
275 void get_reflog_selector(struct strbuf *sb,
276                          struct reflog_walk_info *reflog_info,
277                          const struct date_mode *dmode, int force_date,
278                          int shorten)
279 {
280         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
281         struct reflog_info *info;
282         const char *printed_ref;
283
284         if (!commit_reflog)
285                 return;
286
287         if (shorten) {
288                 if (!commit_reflog->reflogs->short_ref)
289                         commit_reflog->reflogs->short_ref
290                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
291                 printed_ref = commit_reflog->reflogs->short_ref;
292         } else {
293                 printed_ref = commit_reflog->reflogs->ref;
294         }
295
296         strbuf_addf(sb, "%s@{", printed_ref);
297         if (commit_reflog->selector == SELECTOR_DATE ||
298             (commit_reflog->selector == SELECTOR_NONE && force_date)) {
299                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
300                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
301         } else {
302                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
303                             - 2 - commit_reflog->recno);
304         }
305
306         strbuf_addch(sb, '}');
307 }
308
309 void get_reflog_message(struct strbuf *sb,
310                         struct reflog_walk_info *reflog_info)
311 {
312         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
313         struct reflog_info *info;
314         size_t len;
315
316         if (!commit_reflog)
317                 return;
318
319         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
320         len = strlen(info->message);
321         if (len > 0)
322                 len--; /* strip away trailing newline */
323         strbuf_add(sb, info->message, len);
324 }
325
326 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
327 {
328         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
329         struct reflog_info *info;
330
331         if (!commit_reflog)
332                 return NULL;
333
334         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
335         return info->email;
336 }
337
338 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
339                          const struct date_mode *dmode, int force_date)
340 {
341         if (reflog_info && reflog_info->last_commit_reflog) {
342                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
343                 struct reflog_info *info;
344                 struct strbuf selector = STRBUF_INIT;
345
346                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
347                 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
348                 if (oneline) {
349                         printf("%s: %s", selector.buf, info->message);
350                 }
351                 else {
352                         printf("Reflog: %s (%s)\nReflog message: %s",
353                                selector.buf, info->email, info->message);
354                 }
355
356                 strbuf_release(&selector);
357         }
358 }