gitweb: use new Git::Repo API, and add optional caching
[git/gitweb-caching.git] / reflog-walk.c
blobf751fdc8d832cae54647c1a70d888e979d324fd8
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 struct reflog_info {
12 unsigned char osha1[20], nsha1[20];
13 char *email;
14 unsigned long timestamp;
15 int tz;
16 char *message;
17 } *items;
18 int nr, alloc;
21 static int read_one_reflog(unsigned char *osha1, unsigned char *nsha1,
22 const char *email, unsigned long timestamp, int tz,
23 const char *message, void *cb_data)
25 struct complete_reflogs *array = cb_data;
26 struct reflog_info *item;
28 if (array->nr >= array->alloc) {
29 array->alloc = alloc_nr(array->nr + 1);
30 array->items = xrealloc(array->items, array->alloc *
31 sizeof(struct reflog_info));
33 item = array->items + array->nr;
34 memcpy(item->osha1, osha1, 20);
35 memcpy(item->nsha1, nsha1, 20);
36 item->email = xstrdup(email);
37 item->timestamp = timestamp;
38 item->tz = tz;
39 item->message = xstrdup(message);
40 array->nr++;
41 return 0;
44 static struct complete_reflogs *read_complete_reflog(const char *ref)
46 struct complete_reflogs *reflogs =
47 xcalloc(sizeof(struct complete_reflogs), 1);
48 reflogs->ref = xstrdup(ref);
49 for_each_reflog_ent(ref, read_one_reflog, reflogs);
50 if (reflogs->nr == 0) {
51 unsigned char sha1[20];
52 const char *name = resolve_ref(ref, sha1, 1, NULL);
53 if (name)
54 for_each_reflog_ent(name, read_one_reflog, reflogs);
56 if (reflogs->nr == 0) {
57 int len = strlen(ref);
58 char *refname = xmalloc(len + 12);
59 sprintf(refname, "refs/%s", ref);
60 for_each_reflog_ent(refname, read_one_reflog, reflogs);
61 if (reflogs->nr == 0) {
62 sprintf(refname, "refs/heads/%s", ref);
63 for_each_reflog_ent(refname, read_one_reflog, reflogs);
65 free(refname);
67 return reflogs;
70 static int get_reflog_recno_by_time(struct complete_reflogs *array,
71 unsigned long timestamp)
73 int i;
74 for (i = array->nr - 1; i >= 0; i--)
75 if (timestamp >= array->items[i].timestamp)
76 return i;
77 return -1;
80 struct commit_info_lifo {
81 struct commit_info {
82 struct commit *commit;
83 void *util;
84 } *items;
85 int nr, alloc;
88 static struct commit_info *get_commit_info(struct commit *commit,
89 struct commit_info_lifo *lifo, int pop)
91 int i;
92 for (i = 0; i < lifo->nr; i++)
93 if (lifo->items[i].commit == commit) {
94 struct commit_info *result = &lifo->items[i];
95 if (pop) {
96 if (i + 1 < lifo->nr)
97 memmove(lifo->items + i,
98 lifo->items + i + 1,
99 (lifo->nr - i) *
100 sizeof(struct commit_info));
101 lifo->nr--;
103 return result;
105 return NULL;
108 static void add_commit_info(struct commit *commit, void *util,
109 struct commit_info_lifo *lifo)
111 struct commit_info *info;
112 if (lifo->nr >= lifo->alloc) {
113 lifo->alloc = alloc_nr(lifo->nr + 1);
114 lifo->items = xrealloc(lifo->items,
115 lifo->alloc * sizeof(struct commit_info));
117 info = lifo->items + lifo->nr;
118 info->commit = commit;
119 info->util = util;
120 lifo->nr++;
123 struct commit_reflog {
124 int flag, recno;
125 struct complete_reflogs *reflogs;
128 struct reflog_walk_info {
129 struct commit_info_lifo reflogs;
130 struct string_list complete_reflogs;
131 struct commit_reflog *last_commit_reflog;
134 void init_reflog_walk(struct reflog_walk_info** info)
136 *info = xcalloc(sizeof(struct reflog_walk_info), 1);
139 int add_reflog_for_walk(struct reflog_walk_info *info,
140 struct commit *commit, const char *name)
142 unsigned long timestamp = 0;
143 int recno = -1;
144 struct string_list_item *item;
145 struct complete_reflogs *reflogs;
146 char *branch, *at = strchr(name, '@');
147 struct commit_reflog *commit_reflog;
149 if (commit->object.flags & UNINTERESTING)
150 die ("Cannot walk reflogs for %s", name);
152 branch = xstrdup(name);
153 if (at && at[1] == '{') {
154 char *ep;
155 branch[at - name] = '\0';
156 recno = strtoul(at + 2, &ep, 10);
157 if (*ep != '}') {
158 recno = -1;
159 timestamp = approxidate(at + 2);
161 } else
162 recno = 0;
164 item = string_list_lookup(branch, &info->complete_reflogs);
165 if (item)
166 reflogs = item->util;
167 else {
168 if (*branch == '\0') {
169 unsigned char sha1[20];
170 const char *head = resolve_ref("HEAD", sha1, 0, NULL);
171 if (!head)
172 die ("No current branch");
173 free(branch);
174 branch = xstrdup(head);
176 reflogs = read_complete_reflog(branch);
177 if (!reflogs || reflogs->nr == 0) {
178 unsigned char sha1[20];
179 char *b;
180 if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
181 if (reflogs) {
182 free(reflogs->ref);
183 free(reflogs);
185 free(branch);
186 branch = b;
187 reflogs = read_complete_reflog(branch);
190 if (!reflogs || reflogs->nr == 0)
191 return -1;
192 string_list_insert(branch, &info->complete_reflogs)->util
193 = reflogs;
196 commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
197 if (recno < 0) {
198 commit_reflog->flag = 1;
199 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
200 if (commit_reflog->recno < 0) {
201 free(branch);
202 free(commit_reflog);
203 return -1;
205 } else
206 commit_reflog->recno = reflogs->nr - recno - 1;
207 commit_reflog->reflogs = reflogs;
209 add_commit_info(commit, commit_reflog, &info->reflogs);
210 return 0;
213 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
215 struct commit_info *commit_info =
216 get_commit_info(commit, &info->reflogs, 0);
217 struct commit_reflog *commit_reflog;
218 struct reflog_info *reflog;
220 info->last_commit_reflog = NULL;
221 if (!commit_info)
222 return;
224 commit_reflog = commit_info->util;
225 if (commit_reflog->recno < 0) {
226 commit->parents = NULL;
227 return;
230 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
231 info->last_commit_reflog = commit_reflog;
232 commit_reflog->recno--;
233 commit_info->commit = (struct commit *)parse_object(reflog->osha1);
234 if (!commit_info->commit) {
235 commit->parents = NULL;
236 return;
239 commit->parents = xcalloc(sizeof(struct commit_list), 1);
240 commit->parents->item = commit_info->commit;
241 commit->object.flags &= ~(ADDED | SEEN | SHOWN);
244 void show_reflog_message(struct reflog_walk_info* info, int oneline,
245 int relative_date)
247 if (info && info->last_commit_reflog) {
248 struct commit_reflog *commit_reflog = info->last_commit_reflog;
249 struct reflog_info *info;
251 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
252 if (oneline) {
253 printf("%s@{", commit_reflog->reflogs->ref);
254 if (commit_reflog->flag || relative_date)
255 printf("%s", show_date(info->timestamp, 0, 1));
256 else
257 printf("%d", commit_reflog->reflogs->nr
258 - 2 - commit_reflog->recno);
259 printf("}: %s", info->message);
261 else {
262 printf("Reflog: %s@{", commit_reflog->reflogs->ref);
263 if (commit_reflog->flag || relative_date)
264 printf("%s", show_date(info->timestamp,
265 info->tz,
266 relative_date));
267 else
268 printf("%d", commit_reflog->reflogs->nr
269 - 2 - commit_reflog->recno);
270 printf("} (%s)\nReflog message: %s",
271 info->email, info->message);