replace_object.c: use ALLOC_GROW() in register_replace_object()
[git/git.git] / reflog-walk.c
CommitLineData
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1#include "cache.h"
2#include "commit.h"
3#include "refs.h"
4#include "diff.h"
5#include "revision.h"
c455c87c 6#include "string-list.h"
53645a3a 7#include "reflog-walk.h"
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8
9struct complete_reflogs {
10 char *ref;
8f8f5476 11 const char *short_ref;
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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
22static 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
45static 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];
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53 const char *name;
54 void *name_to_free;
55 name = name_to_free = resolve_refdup(ref, sha1, 1, NULL);
d5a35c11 56 if (name) {
8860fd42 57 for_each_reflog_ent(name, read_one_reflog, reflogs);
96ec7b1e 58 free(name_to_free);
d5a35c11 59 }
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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
75static int get_reflog_recno_by_time(struct complete_reflogs *array,
76 unsigned long timestamp)
77{
78 int i;
40ab7c33 79 for (i = array->nr - 1; i >= 0; i--)
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80 if (timestamp >= array->items[i].timestamp)
81 return i;
82 return -1;
83}
84
85struct commit_info_lifo {
86 struct commit_info {
87 struct commit *commit;
88 void *util;
89 } *items;
90 int nr, alloc;
91};
92
93static 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
113static 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
128struct commit_reflog {
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129 int recno;
130 enum selector_type {
131 SELECTOR_NONE,
132 SELECTOR_INDEX,
133 SELECTOR_DATE
134 } selector;
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135 struct complete_reflogs *reflogs;
136};
137
138struct reflog_walk_info {
139 struct commit_info_lifo reflogs;
c455c87c 140 struct string_list complete_reflogs;
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141 struct commit_reflog *last_commit_reflog;
142};
143
144void init_reflog_walk(struct reflog_walk_info** info)
145{
146 *info = xcalloc(sizeof(struct reflog_walk_info), 1);
147}
148
7b69b873 149int add_reflog_for_walk(struct reflog_walk_info *info,
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150 struct commit *commit, const char *name)
151{
152 unsigned long timestamp = 0;
153 int recno = -1;
c455c87c 154 struct string_list_item *item;
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155 struct complete_reflogs *reflogs;
156 char *branch, *at = strchr(name, '@');
157 struct commit_reflog *commit_reflog;
a763126b 158 enum selector_type selector = SELECTOR_NONE;
8860fd42 159
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160 if (commit->object.flags & UNINTERESTING)
161 die ("Cannot walk reflogs for %s", name);
162
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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);
a763126b 171 selector = SELECTOR_DATE;
8860fd42 172 }
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173 else
174 selector = SELECTOR_INDEX;
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175 } else
176 recno = 0;
177
e8c8b713 178 item = string_list_lookup(&info->complete_reflogs, branch);
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179 if (item)
180 reflogs = item->util;
181 else {
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182 if (*branch == '\0') {
183 unsigned char sha1[20];
d271fd53 184 free(branch);
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185 branch = resolve_refdup("HEAD", sha1, 0, NULL);
186 if (!branch)
187 die ("No current branch");
188
d271fd53 189 }
8860fd42 190 reflogs = read_complete_reflog(branch);
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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 }
8860fd42 204 if (!reflogs || reflogs->nr == 0)
7b69b873 205 return -1;
78a395d3 206 string_list_insert(&info->complete_reflogs, branch)->util
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207 = reflogs;
208 }
209
210 commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
211 if (recno < 0) {
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212 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
213 if (commit_reflog->recno < 0) {
214 free(branch);
215 free(commit_reflog);
7b69b873 216 return -1;
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217 }
218 } else
219 commit_reflog->recno = reflogs->nr - recno - 1;
a763126b 220 commit_reflog->selector = selector;
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221 commit_reflog->reflogs = reflogs;
222
223 add_commit_info(commit, commit_reflog, &info->reflogs);
7b69b873 224 return 0;
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225}
226
227void 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;
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255}
256
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257void get_reflog_selector(struct strbuf *sb,
258 struct reflog_walk_info *reflog_info,
55ccf85a 259 enum date_mode dmode, int force_date,
8f8f5476 260 int shorten)
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261{
262 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
263 struct reflog_info *info;
8f8f5476 264 const char *printed_ref;
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265
266 if (!commit_reflog)
267 return;
268
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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);
794151e9 279 if (commit_reflog->selector == SELECTOR_DATE ||
55ccf85a 280 (commit_reflog->selector == SELECTOR_NONE && force_date)) {
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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
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291void 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
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308const 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
72b103fe 320void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
55ccf85a 321 enum date_mode dmode, int force_date)
8860fd42 322{
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323 if (reflog_info && reflog_info->last_commit_reflog) {
324 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
8860fd42 325 struct reflog_info *info;
72b103fe 326 struct strbuf selector = STRBUF_INIT;
8860fd42 327
4d12a471 328 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
55ccf85a 329 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
4d12a471 330 if (oneline) {
72b103fe 331 printf("%s: %s", selector.buf, info->message);
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332 }
333 else {
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334 printf("Reflog: %s (%s)\nReflog message: %s",
335 selector.buf, info->email, info->message);
4d12a471 336 }
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337
338 strbuf_release(&selector);
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339 }
340}