log -L: store the path instead of a diff_filespec
[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         if (array->nr >= array->alloc) {
30                 array->alloc = alloc_nr(array->nr + 1);
31                 array->items = xrealloc(array->items, array->alloc *
32                         sizeof(struct reflog_info));
33         }
34         item = array->items + array->nr;
35         memcpy(item->osha1, osha1, 20);
36         memcpy(item->nsha1, nsha1, 20);
37         item->email = xstrdup(email);
38         item->timestamp = timestamp;
39         item->tz = tz;
40         item->message = xstrdup(message);
41         array->nr++;
42         return 0;
43 }
44
45 static struct complete_reflogs *read_complete_reflog(const char *ref)
46 {
47         struct complete_reflogs *reflogs =
48                 xcalloc(sizeof(struct complete_reflogs), 1);
49         reflogs->ref = xstrdup(ref);
50         for_each_reflog_ent(ref, read_one_reflog, reflogs);
51         if (reflogs->nr == 0) {
52                 unsigned char sha1[20];
53                 const char *name;
54                 void *name_to_free;
55                 name = name_to_free = resolve_refdup(ref, sha1, 1, NULL);
56                 if (name) {
57                         for_each_reflog_ent(name, read_one_reflog, reflogs);
58                         free(name_to_free);
59                 }
60         }
61         if (reflogs->nr == 0) {
62                 int len = strlen(ref);
63                 char *refname = xmalloc(len + 12);
64                 sprintf(refname, "refs/%s", ref);
65                 for_each_reflog_ent(refname, read_one_reflog, reflogs);
66                 if (reflogs->nr == 0) {
67                         sprintf(refname, "refs/heads/%s", ref);
68                         for_each_reflog_ent(refname, read_one_reflog, reflogs);
69                 }
70                 free(refname);
71         }
72         return reflogs;
73 }
74
75 static int get_reflog_recno_by_time(struct complete_reflogs *array,
76         unsigned long timestamp)
77 {
78         int i;
79         for (i = array->nr - 1; i >= 0; i--)
80                 if (timestamp >= array->items[i].timestamp)
81                         return i;
82         return -1;
83 }
84
85 struct commit_info_lifo {
86         struct commit_info {
87                 struct commit *commit;
88                 void *util;
89         } *items;
90         int nr, alloc;
91 };
92
93 static struct commit_info *get_commit_info(struct commit *commit,
94                 struct commit_info_lifo *lifo, int pop)
95 {
96         int i;
97         for (i = 0; i < lifo->nr; i++)
98                 if (lifo->items[i].commit == commit) {
99                         struct commit_info *result = &lifo->items[i];
100                         if (pop) {
101                                 if (i + 1 < lifo->nr)
102                                         memmove(lifo->items + i,
103                                                 lifo->items + i + 1,
104                                                 (lifo->nr - i) *
105                                                 sizeof(struct commit_info));
106                                 lifo->nr--;
107                         }
108                         return result;
109                 }
110         return NULL;
111 }
112
113 static void add_commit_info(struct commit *commit, void *util,
114                 struct commit_info_lifo *lifo)
115 {
116         struct commit_info *info;
117         if (lifo->nr >= lifo->alloc) {
118                 lifo->alloc = alloc_nr(lifo->nr + 1);
119                 lifo->items = xrealloc(lifo->items,
120                         lifo->alloc * sizeof(struct commit_info));
121         }
122         info = lifo->items + lifo->nr;
123         info->commit = commit;
124         info->util = util;
125         lifo->nr++;
126 }
127
128 struct commit_reflog {
129         int recno;
130         enum selector_type {
131                 SELECTOR_NONE,
132                 SELECTOR_INDEX,
133                 SELECTOR_DATE
134         } selector;
135         struct complete_reflogs *reflogs;
136 };
137
138 struct reflog_walk_info {
139         struct commit_info_lifo reflogs;
140         struct string_list complete_reflogs;
141         struct commit_reflog *last_commit_reflog;
142 };
143
144 void init_reflog_walk(struct reflog_walk_info** info)
145 {
146         *info = xcalloc(sizeof(struct reflog_walk_info), 1);
147 }
148
149 int add_reflog_for_walk(struct reflog_walk_info *info,
150                 struct commit *commit, const char *name)
151 {
152         unsigned long timestamp = 0;
153         int recno = -1;
154         struct string_list_item *item;
155         struct complete_reflogs *reflogs;
156         char *branch, *at = strchr(name, '@');
157         struct commit_reflog *commit_reflog;
158         enum selector_type selector = SELECTOR_NONE;
159
160         if (commit->object.flags & UNINTERESTING)
161                 die ("Cannot walk reflogs for %s", name);
162
163         branch = xstrdup(name);
164         if (at && at[1] == '{') {
165                 char *ep;
166                 branch[at - name] = '\0';
167                 recno = strtoul(at + 2, &ep, 10);
168                 if (*ep != '}') {
169                         recno = -1;
170                         timestamp = approxidate(at + 2);
171                         selector = SELECTOR_DATE;
172                 }
173                 else
174                         selector = SELECTOR_INDEX;
175         } else
176                 recno = 0;
177
178         item = string_list_lookup(&info->complete_reflogs, branch);
179         if (item)
180                 reflogs = item->util;
181         else {
182                 if (*branch == '\0') {
183                         unsigned char sha1[20];
184                         free(branch);
185                         branch = resolve_refdup("HEAD", sha1, 0, NULL);
186                         if (!branch)
187                                 die ("No current branch");
188
189                 }
190                 reflogs = read_complete_reflog(branch);
191                 if (!reflogs || reflogs->nr == 0) {
192                         unsigned char sha1[20];
193                         char *b;
194                         if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
195                                 if (reflogs) {
196                                         free(reflogs->ref);
197                                         free(reflogs);
198                                 }
199                                 free(branch);
200                                 branch = b;
201                                 reflogs = read_complete_reflog(branch);
202                         }
203                 }
204                 if (!reflogs || reflogs->nr == 0)
205                         return -1;
206                 string_list_insert(&info->complete_reflogs, branch)->util
207                         = reflogs;
208         }
209
210         commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
211         if (recno < 0) {
212                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
213                 if (commit_reflog->recno < 0) {
214                         free(branch);
215                         free(commit_reflog);
216                         return -1;
217                 }
218         } else
219                 commit_reflog->recno = reflogs->nr - recno - 1;
220         commit_reflog->selector = selector;
221         commit_reflog->reflogs = reflogs;
222
223         add_commit_info(commit, commit_reflog, &info->reflogs);
224         return 0;
225 }
226
227 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
228 {
229         struct commit_info *commit_info =
230                 get_commit_info(commit, &info->reflogs, 0);
231         struct commit_reflog *commit_reflog;
232         struct reflog_info *reflog;
233
234         info->last_commit_reflog = NULL;
235         if (!commit_info)
236                 return;
237
238         commit_reflog = commit_info->util;
239         if (commit_reflog->recno < 0) {
240                 commit->parents = NULL;
241                 return;
242         }
243
244         reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
245         info->last_commit_reflog = commit_reflog;
246         commit_reflog->recno--;
247         commit_info->commit = (struct commit *)parse_object(reflog->osha1);
248         if (!commit_info->commit) {
249                 commit->parents = NULL;
250                 return;
251         }
252
253         commit->parents = xcalloc(sizeof(struct commit_list), 1);
254         commit->parents->item = commit_info->commit;
255 }
256
257 void get_reflog_selector(struct strbuf *sb,
258                          struct reflog_walk_info *reflog_info,
259                          enum date_mode dmode, int force_date,
260                          int shorten)
261 {
262         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
263         struct reflog_info *info;
264         const char *printed_ref;
265
266         if (!commit_reflog)
267                 return;
268
269         if (shorten) {
270                 if (!commit_reflog->reflogs->short_ref)
271                         commit_reflog->reflogs->short_ref
272                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
273                 printed_ref = commit_reflog->reflogs->short_ref;
274         } else {
275                 printed_ref = commit_reflog->reflogs->ref;
276         }
277
278         strbuf_addf(sb, "%s@{", printed_ref);
279         if (commit_reflog->selector == SELECTOR_DATE ||
280             (commit_reflog->selector == SELECTOR_NONE && force_date)) {
281                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
282                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
283         } else {
284                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
285                             - 2 - commit_reflog->recno);
286         }
287
288         strbuf_addch(sb, '}');
289 }
290
291 void get_reflog_message(struct strbuf *sb,
292                         struct reflog_walk_info *reflog_info)
293 {
294         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
295         struct reflog_info *info;
296         size_t len;
297
298         if (!commit_reflog)
299                 return;
300
301         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
302         len = strlen(info->message);
303         if (len > 0)
304                 len--; /* strip away trailing newline */
305         strbuf_add(sb, info->message, len);
306 }
307
308 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
309 {
310         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
311         struct reflog_info *info;
312
313         if (!commit_reflog)
314                 return NULL;
315
316         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
317         return info->email;
318 }
319
320 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
321                          enum date_mode dmode, int force_date)
322 {
323         if (reflog_info && reflog_info->last_commit_reflog) {
324                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
325                 struct reflog_info *info;
326                 struct strbuf selector = STRBUF_INIT;
327
328                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
329                 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
330                 if (oneline) {
331                         printf("%s: %s", selector.buf, info->message);
332                 }
333                 else {
334                         printf("Reflog: %s (%s)\nReflog message: %s",
335                                selector.buf, info->email, info->message);
336                 }
337
338                 strbuf_release(&selector);
339         }
340 }