Merge branch 'jk/tag-sort'
[git.git] / reflog-walk.c
blob9ce8b53ccc85abcf27d7aff8f86a350ef2cd36b2
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"
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;
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)
26 struct complete_reflogs *array = cb_data;
27 struct reflog_info *item;
29 ALLOC_GROW(array->items, array->nr + 1, array->alloc);
30 item = array->items + array->nr;
31 hashcpy(item->osha1, osha1);
32 hashcpy(item->nsha1, nsha1);
33 item->email = xstrdup(email);
34 item->timestamp = timestamp;
35 item->tz = tz;
36 item->message = xstrdup(message);
37 array->nr++;
38 return 0;
41 static struct complete_reflogs *read_complete_reflog(const char *ref)
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 unsigned char sha1[20];
49 const char *name;
50 void *name_to_free;
51 name = name_to_free = resolve_refdup(ref, sha1, 1, NULL);
52 if (name) {
53 for_each_reflog_ent(name, read_one_reflog, reflogs);
54 free(name_to_free);
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);
66 free(refname);
68 return reflogs;
71 static int get_reflog_recno_by_time(struct complete_reflogs *array,
72 unsigned long timestamp)
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;
81 struct commit_info_lifo {
82 struct commit_info {
83 struct commit *commit;
84 void *util;
85 } *items;
86 int nr, alloc;
89 static struct commit_info *get_commit_info(struct commit *commit,
90 struct commit_info_lifo *lifo, int pop)
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--;
104 return result;
106 return NULL;
109 static void add_commit_info(struct commit *commit, void *util,
110 struct commit_info_lifo *lifo)
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++;
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;
130 struct reflog_walk_info {
131 struct commit_info_lifo reflogs;
132 struct string_list complete_reflogs;
133 struct commit_reflog *last_commit_reflog;
136 void init_reflog_walk(struct reflog_walk_info** info)
138 *info = xcalloc(1, sizeof(struct reflog_walk_info));
141 int add_reflog_for_walk(struct reflog_walk_info *info,
142 struct commit *commit, const char *name)
144 unsigned long 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;
152 if (commit->object.flags & UNINTERESTING)
153 die ("Cannot walk reflogs for %s", name);
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;
165 else
166 selector = SELECTOR_INDEX;
167 } else
168 recno = 0;
170 item = string_list_lookup(&info->complete_reflogs, branch);
171 if (item)
172 reflogs = item->util;
173 else {
174 if (*branch == '\0') {
175 unsigned char sha1[20];
176 free(branch);
177 branch = resolve_refdup("HEAD", sha1, 0, NULL);
178 if (!branch)
179 die ("No current branch");
182 reflogs = read_complete_reflog(branch);
183 if (!reflogs || reflogs->nr == 0) {
184 unsigned char sha1[20];
185 char *b;
186 if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
187 if (reflogs) {
188 free(reflogs->ref);
189 free(reflogs);
191 free(branch);
192 branch = b;
193 reflogs = read_complete_reflog(branch);
196 if (!reflogs || reflogs->nr == 0)
197 return -1;
198 string_list_insert(&info->complete_reflogs, branch)->util
199 = reflogs;
202 commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
203 if (recno < 0) {
204 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
205 if (commit_reflog->recno < 0) {
206 free(branch);
207 free(commit_reflog);
208 return -1;
210 } else
211 commit_reflog->recno = reflogs->nr - recno - 1;
212 commit_reflog->selector = selector;
213 commit_reflog->reflogs = reflogs;
215 add_commit_info(commit, commit_reflog, &info->reflogs);
216 return 0;
219 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
221 struct commit_info *commit_info =
222 get_commit_info(commit, &info->reflogs, 0);
223 struct commit_reflog *commit_reflog;
224 struct reflog_info *reflog;
226 info->last_commit_reflog = NULL;
227 if (!commit_info)
228 return;
230 commit_reflog = commit_info->util;
231 if (commit_reflog->recno < 0) {
232 commit->parents = NULL;
233 return;
236 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
237 info->last_commit_reflog = commit_reflog;
238 commit_reflog->recno--;
239 commit_info->commit = (struct commit *)parse_object(reflog->osha1);
240 if (!commit_info->commit) {
241 commit->parents = NULL;
242 return;
245 commit->parents = xcalloc(1, sizeof(struct commit_list));
246 commit->parents->item = commit_info->commit;
249 void get_reflog_selector(struct strbuf *sb,
250 struct reflog_walk_info *reflog_info,
251 enum date_mode dmode, int force_date,
252 int shorten)
254 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
255 struct reflog_info *info;
256 const char *printed_ref;
258 if (!commit_reflog)
259 return;
261 if (shorten) {
262 if (!commit_reflog->reflogs->short_ref)
263 commit_reflog->reflogs->short_ref
264 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
265 printed_ref = commit_reflog->reflogs->short_ref;
266 } else {
267 printed_ref = commit_reflog->reflogs->ref;
270 strbuf_addf(sb, "%s@{", printed_ref);
271 if (commit_reflog->selector == SELECTOR_DATE ||
272 (commit_reflog->selector == SELECTOR_NONE && force_date)) {
273 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
274 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
275 } else {
276 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
277 - 2 - commit_reflog->recno);
280 strbuf_addch(sb, '}');
283 void get_reflog_message(struct strbuf *sb,
284 struct reflog_walk_info *reflog_info)
286 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
287 struct reflog_info *info;
288 size_t len;
290 if (!commit_reflog)
291 return;
293 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
294 len = strlen(info->message);
295 if (len > 0)
296 len--; /* strip away trailing newline */
297 strbuf_add(sb, info->message, len);
300 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
302 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
303 struct reflog_info *info;
305 if (!commit_reflog)
306 return NULL;
308 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
309 return info->email;
312 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
313 enum date_mode dmode, int force_date)
315 if (reflog_info && reflog_info->last_commit_reflog) {
316 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
317 struct reflog_info *info;
318 struct strbuf selector = STRBUF_INIT;
320 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
321 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
322 if (oneline) {
323 printf("%s: %s", selector.buf, info->message);
325 else {
326 printf("Reflog: %s (%s)\nReflog message: %s",
327 selector.buf, info->email, info->message);
330 strbuf_release(&selector);