git-p4: test --keep-path
[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 = resolve_ref(ref, sha1, 1, NULL);
54                 if (name) {
55                         name = xstrdup(name);
56                         for_each_reflog_ent(name, read_one_reflog, reflogs);
57                         free((char *)name);
58                 }
59         }
60         if (reflogs->nr == 0) {
61                 int len = strlen(ref);
62                 char *refname = xmalloc(len + 12);
63                 sprintf(refname, "refs/%s", ref);
64                 for_each_reflog_ent(refname, read_one_reflog, reflogs);
65                 if (reflogs->nr == 0) {
66                         sprintf(refname, "refs/heads/%s", ref);
67                         for_each_reflog_ent(refname, read_one_reflog, reflogs);
68                 }
69                 free(refname);
70         }
71         return reflogs;
72 }
73
74 static int get_reflog_recno_by_time(struct complete_reflogs *array,
75         unsigned long timestamp)
76 {
77         int i;
78         for (i = array->nr - 1; i >= 0; i--)
79                 if (timestamp >= array->items[i].timestamp)
80                         return i;
81         return -1;
82 }
83
84 struct commit_info_lifo {
85         struct commit_info {
86                 struct commit *commit;
87                 void *util;
88         } *items;
89         int nr, alloc;
90 };
91
92 static struct commit_info *get_commit_info(struct commit *commit,
93                 struct commit_info_lifo *lifo, int pop)
94 {
95         int i;
96         for (i = 0; i < lifo->nr; i++)
97                 if (lifo->items[i].commit == commit) {
98                         struct commit_info *result = &lifo->items[i];
99                         if (pop) {
100                                 if (i + 1 < lifo->nr)
101                                         memmove(lifo->items + i,
102                                                 lifo->items + i + 1,
103                                                 (lifo->nr - i) *
104                                                 sizeof(struct commit_info));
105                                 lifo->nr--;
106                         }
107                         return result;
108                 }
109         return NULL;
110 }
111
112 static void add_commit_info(struct commit *commit, void *util,
113                 struct commit_info_lifo *lifo)
114 {
115         struct commit_info *info;
116         if (lifo->nr >= lifo->alloc) {
117                 lifo->alloc = alloc_nr(lifo->nr + 1);
118                 lifo->items = xrealloc(lifo->items,
119                         lifo->alloc * sizeof(struct commit_info));
120         }
121         info = lifo->items + lifo->nr;
122         info->commit = commit;
123         info->util = util;
124         lifo->nr++;
125 }
126
127 struct commit_reflog {
128         int flag, recno;
129         struct complete_reflogs *reflogs;
130 };
131
132 struct reflog_walk_info {
133         struct commit_info_lifo reflogs;
134         struct string_list complete_reflogs;
135         struct commit_reflog *last_commit_reflog;
136 };
137
138 void init_reflog_walk(struct reflog_walk_info** info)
139 {
140         *info = xcalloc(sizeof(struct reflog_walk_info), 1);
141 }
142
143 int add_reflog_for_walk(struct reflog_walk_info *info,
144                 struct commit *commit, const char *name)
145 {
146         unsigned long timestamp = 0;
147         int recno = -1;
148         struct string_list_item *item;
149         struct complete_reflogs *reflogs;
150         char *branch, *at = strchr(name, '@');
151         struct commit_reflog *commit_reflog;
152
153         if (commit->object.flags & UNINTERESTING)
154                 die ("Cannot walk reflogs for %s", name);
155
156         branch = xstrdup(name);
157         if (at && at[1] == '{') {
158                 char *ep;
159                 branch[at - name] = '\0';
160                 recno = strtoul(at + 2, &ep, 10);
161                 if (*ep != '}') {
162                         recno = -1;
163                         timestamp = approxidate(at + 2);
164                 }
165         } else
166                 recno = 0;
167
168         item = string_list_lookup(&info->complete_reflogs, branch);
169         if (item)
170                 reflogs = item->util;
171         else {
172                 if (*branch == '\0') {
173                         unsigned char sha1[20];
174                         const char *head = resolve_ref("HEAD", sha1, 0, NULL);
175                         if (!head)
176                                 die ("No current branch");
177                         free(branch);
178                         branch = xstrdup(head);
179                 }
180                 reflogs = read_complete_reflog(branch);
181                 if (!reflogs || reflogs->nr == 0) {
182                         unsigned char sha1[20];
183                         char *b;
184                         if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
185                                 if (reflogs) {
186                                         free(reflogs->ref);
187                                         free(reflogs);
188                                 }
189                                 free(branch);
190                                 branch = b;
191                                 reflogs = read_complete_reflog(branch);
192                         }
193                 }
194                 if (!reflogs || reflogs->nr == 0)
195                         return -1;
196                 string_list_insert(&info->complete_reflogs, branch)->util
197                         = reflogs;
198         }
199
200         commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
201         if (recno < 0) {
202                 commit_reflog->flag = 1;
203                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
204                 if (commit_reflog->recno < 0) {
205                         free(branch);
206                         free(commit_reflog);
207                         return -1;
208                 }
209         } else
210                 commit_reflog->recno = reflogs->nr - recno - 1;
211         commit_reflog->reflogs = reflogs;
212
213         add_commit_info(commit, commit_reflog, &info->reflogs);
214         return 0;
215 }
216
217 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
218 {
219         struct commit_info *commit_info =
220                 get_commit_info(commit, &info->reflogs, 0);
221         struct commit_reflog *commit_reflog;
222         struct reflog_info *reflog;
223
224         info->last_commit_reflog = NULL;
225         if (!commit_info)
226                 return;
227
228         commit_reflog = commit_info->util;
229         if (commit_reflog->recno < 0) {
230                 commit->parents = NULL;
231                 return;
232         }
233
234         reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
235         info->last_commit_reflog = commit_reflog;
236         commit_reflog->recno--;
237         commit_info->commit = (struct commit *)parse_object(reflog->osha1);
238         if (!commit_info->commit) {
239                 commit->parents = NULL;
240                 return;
241         }
242
243         commit->parents = xcalloc(sizeof(struct commit_list), 1);
244         commit->parents->item = commit_info->commit;
245 }
246
247 void get_reflog_selector(struct strbuf *sb,
248                          struct reflog_walk_info *reflog_info,
249                          enum date_mode dmode,
250                          int shorten)
251 {
252         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
253         struct reflog_info *info;
254         const char *printed_ref;
255
256         if (!commit_reflog)
257                 return;
258
259         if (shorten) {
260                 if (!commit_reflog->reflogs->short_ref)
261                         commit_reflog->reflogs->short_ref
262                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
263                 printed_ref = commit_reflog->reflogs->short_ref;
264         } else {
265                 printed_ref = commit_reflog->reflogs->ref;
266         }
267
268         strbuf_addf(sb, "%s@{", printed_ref);
269         if (commit_reflog->flag || dmode) {
270                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
271                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
272         } else {
273                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
274                             - 2 - commit_reflog->recno);
275         }
276
277         strbuf_addch(sb, '}');
278 }
279
280 void get_reflog_message(struct strbuf *sb,
281                         struct reflog_walk_info *reflog_info)
282 {
283         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
284         struct reflog_info *info;
285         size_t len;
286
287         if (!commit_reflog)
288                 return;
289
290         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
291         len = strlen(info->message);
292         if (len > 0)
293                 len--; /* strip away trailing newline */
294         strbuf_add(sb, info->message, len);
295 }
296
297 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
298         enum date_mode dmode)
299 {
300         if (reflog_info && reflog_info->last_commit_reflog) {
301                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
302                 struct reflog_info *info;
303                 struct strbuf selector = STRBUF_INIT;
304
305                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
306                 get_reflog_selector(&selector, reflog_info, dmode, 0);
307                 if (oneline) {
308                         printf("%s: %s", selector.buf, info->message);
309                 }
310                 else {
311                         printf("Reflog: %s (%s)\nReflog message: %s",
312                                selector.buf, info->email, info->message);
313                 }
314
315                 strbuf_release(&selector);
316         }
317 }