Convert many resolve_ref() calls to read_ref*() and ref_exists()
[git/git.git] / reflog-walk.c
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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];
53 const char *name = resolve_ref(ref, sha1, 1, NULL);
54 if (name)
55 for_each_reflog_ent(name, read_one_reflog, reflogs);
56 }
57 if (reflogs->nr == 0) {
58 int len = strlen(ref);
59 char *refname = xmalloc(len + 12);
60 sprintf(refname, "refs/%s", ref);
61 for_each_reflog_ent(refname, read_one_reflog, reflogs);
62 if (reflogs->nr == 0) {
63 sprintf(refname, "refs/heads/%s", ref);
64 for_each_reflog_ent(refname, read_one_reflog, reflogs);
65 }
66 free(refname);
67 }
68 return reflogs;
69}
70
71static int get_reflog_recno_by_time(struct complete_reflogs *array,
72 unsigned long timestamp)
73{
74 int i;
40ab7c33 75 for (i = array->nr - 1; i >= 0; i--)
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76 if (timestamp >= array->items[i].timestamp)
77 return i;
78 return -1;
79}
80
81struct commit_info_lifo {
82 struct commit_info {
83 struct commit *commit;
84 void *util;
85 } *items;
86 int nr, alloc;
87};
88
89static 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
109static void add_commit_info(struct commit *commit, void *util,
110 struct commit_info_lifo *lifo)
111{
112 struct commit_info *info;
113 if (lifo->nr >= lifo->alloc) {
114 lifo->alloc = alloc_nr(lifo->nr + 1);
115 lifo->items = xrealloc(lifo->items,
116 lifo->alloc * sizeof(struct commit_info));
117 }
118 info = lifo->items + lifo->nr;
119 info->commit = commit;
120 info->util = util;
121 lifo->nr++;
122}
123
124struct commit_reflog {
125 int flag, recno;
126 struct complete_reflogs *reflogs;
127};
128
129struct reflog_walk_info {
130 struct commit_info_lifo reflogs;
c455c87c 131 struct string_list complete_reflogs;
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132 struct commit_reflog *last_commit_reflog;
133};
134
135void init_reflog_walk(struct reflog_walk_info** info)
136{
137 *info = xcalloc(sizeof(struct reflog_walk_info), 1);
138}
139
7b69b873 140int add_reflog_for_walk(struct reflog_walk_info *info,
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141 struct commit *commit, const char *name)
142{
143 unsigned long timestamp = 0;
144 int recno = -1;
c455c87c 145 struct string_list_item *item;
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146 struct complete_reflogs *reflogs;
147 char *branch, *at = strchr(name, '@');
148 struct commit_reflog *commit_reflog;
149
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150 if (commit->object.flags & UNINTERESTING)
151 die ("Cannot walk reflogs for %s", name);
152
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153 branch = xstrdup(name);
154 if (at && at[1] == '{') {
155 char *ep;
156 branch[at - name] = '\0';
157 recno = strtoul(at + 2, &ep, 10);
158 if (*ep != '}') {
159 recno = -1;
160 timestamp = approxidate(at + 2);
161 }
162 } else
163 recno = 0;
164
e8c8b713 165 item = string_list_lookup(&info->complete_reflogs, branch);
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166 if (item)
167 reflogs = item->util;
168 else {
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169 if (*branch == '\0') {
170 unsigned char sha1[20];
171 const char *head = resolve_ref("HEAD", sha1, 0, NULL);
172 if (!head)
173 die ("No current branch");
174 free(branch);
175 branch = xstrdup(head);
176 }
8860fd42 177 reflogs = read_complete_reflog(branch);
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178 if (!reflogs || reflogs->nr == 0) {
179 unsigned char sha1[20];
180 char *b;
181 if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
182 if (reflogs) {
183 free(reflogs->ref);
184 free(reflogs);
185 }
186 free(branch);
187 branch = b;
188 reflogs = read_complete_reflog(branch);
189 }
190 }
8860fd42 191 if (!reflogs || reflogs->nr == 0)
7b69b873 192 return -1;
78a395d3 193 string_list_insert(&info->complete_reflogs, branch)->util
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194 = reflogs;
195 }
196
197 commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
198 if (recno < 0) {
199 commit_reflog->flag = 1;
200 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
201 if (commit_reflog->recno < 0) {
202 free(branch);
203 free(commit_reflog);
7b69b873 204 return -1;
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205 }
206 } else
207 commit_reflog->recno = reflogs->nr - recno - 1;
208 commit_reflog->reflogs = reflogs;
209
210 add_commit_info(commit, commit_reflog, &info->reflogs);
7b69b873 211 return 0;
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212}
213
214void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
215{
216 struct commit_info *commit_info =
217 get_commit_info(commit, &info->reflogs, 0);
218 struct commit_reflog *commit_reflog;
219 struct reflog_info *reflog;
220
221 info->last_commit_reflog = NULL;
222 if (!commit_info)
223 return;
224
225 commit_reflog = commit_info->util;
226 if (commit_reflog->recno < 0) {
227 commit->parents = NULL;
228 return;
229 }
230
231 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
232 info->last_commit_reflog = commit_reflog;
233 commit_reflog->recno--;
234 commit_info->commit = (struct commit *)parse_object(reflog->osha1);
235 if (!commit_info->commit) {
236 commit->parents = NULL;
237 return;
238 }
239
240 commit->parents = xcalloc(sizeof(struct commit_list), 1);
241 commit->parents->item = commit_info->commit;
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242}
243
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244void get_reflog_selector(struct strbuf *sb,
245 struct reflog_walk_info *reflog_info,
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246 enum date_mode dmode,
247 int shorten)
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248{
249 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
250 struct reflog_info *info;
8f8f5476 251 const char *printed_ref;
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252
253 if (!commit_reflog)
254 return;
255
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256 if (shorten) {
257 if (!commit_reflog->reflogs->short_ref)
258 commit_reflog->reflogs->short_ref
259 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
260 printed_ref = commit_reflog->reflogs->short_ref;
261 } else {
262 printed_ref = commit_reflog->reflogs->ref;
263 }
264
265 strbuf_addf(sb, "%s@{", printed_ref);
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266 if (commit_reflog->flag || dmode) {
267 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
268 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
269 } else {
270 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
271 - 2 - commit_reflog->recno);
272 }
273
274 strbuf_addch(sb, '}');
275}
276
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277void get_reflog_message(struct strbuf *sb,
278 struct reflog_walk_info *reflog_info)
279{
280 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
281 struct reflog_info *info;
282 size_t len;
283
284 if (!commit_reflog)
285 return;
286
287 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
288 len = strlen(info->message);
289 if (len > 0)
290 len--; /* strip away trailing newline */
291 strbuf_add(sb, info->message, len);
292}
293
72b103fe 294void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
cd437120 295 enum date_mode dmode)
8860fd42 296{
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297 if (reflog_info && reflog_info->last_commit_reflog) {
298 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
8860fd42 299 struct reflog_info *info;
72b103fe 300 struct strbuf selector = STRBUF_INIT;
8860fd42 301
4d12a471 302 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
8f8f5476 303 get_reflog_selector(&selector, reflog_info, dmode, 0);
4d12a471 304 if (oneline) {
72b103fe 305 printf("%s: %s", selector.buf, info->message);
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306 }
307 else {
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308 printf("Reflog: %s (%s)\nReflog message: %s",
309 selector.buf, info->email, info->message);
4d12a471 310 }
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311
312 strbuf_release(&selector);
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313 }
314}