provide a nice @{...} syntax to always mean the current branch reflog
[git/git.git] / reflog-walk.c
CommitLineData
8860fd42
JS
1#include "cache.h"
2#include "commit.h"
3#include "refs.h"
4#include "diff.h"
5#include "revision.h"
6#include "path-list.h"
53645a3a 7#include "reflog-walk.h"
8860fd42
JS
8
9struct 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;
19};
20
21static 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)
24{
25 struct complete_reflogs *array = cb_data;
26 struct reflog_info *item;
27
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));
32 }
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;
42}
43
44static struct complete_reflogs *read_complete_reflog(const char *ref)
45{
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);
55 }
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);
64 }
65 free(refname);
66 }
67 return reflogs;
68}
69
70static int get_reflog_recno_by_time(struct complete_reflogs *array,
71 unsigned long timestamp)
72{
73 int i;
40ab7c33 74 for (i = array->nr - 1; i >= 0; i--)
8860fd42
JS
75 if (timestamp >= array->items[i].timestamp)
76 return i;
77 return -1;
78}
79
80struct commit_info_lifo {
81 struct commit_info {
82 struct commit *commit;
83 void *util;
84 } *items;
85 int nr, alloc;
86};
87
88static struct commit_info *get_commit_info(struct commit *commit,
89 struct commit_info_lifo *lifo, int pop)
90{
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--;
102 }
103 return result;
104 }
105 return NULL;
106}
107
108static void add_commit_info(struct commit *commit, void *util,
109 struct commit_info_lifo *lifo)
110{
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));
116 }
117 info = lifo->items + lifo->nr;
118 info->commit = commit;
119 info->util = util;
120 lifo->nr++;
121}
122
123struct commit_reflog {
124 int flag, recno;
125 struct complete_reflogs *reflogs;
126};
127
128struct reflog_walk_info {
129 struct commit_info_lifo reflogs;
130 struct path_list complete_reflogs;
131 struct commit_reflog *last_commit_reflog;
132};
133
134void init_reflog_walk(struct reflog_walk_info** info)
135{
136 *info = xcalloc(sizeof(struct reflog_walk_info), 1);
137}
138
139void add_reflog_for_walk(struct reflog_walk_info *info,
140 struct commit *commit, const char *name)
141{
142 unsigned long timestamp = 0;
143 int recno = -1;
144 struct path_list_item *item;
145 struct complete_reflogs *reflogs;
146 char *branch, *at = strchr(name, '@');
147 struct commit_reflog *commit_reflog;
148
db055e65
JS
149 if (commit->object.flags & UNINTERESTING)
150 die ("Cannot walk reflogs for %s", name);
151
8860fd42
JS
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);
160 }
161 } else
162 recno = 0;
163
164 item = path_list_lookup(branch, &info->complete_reflogs);
165 if (item)
166 reflogs = item->util;
167 else {
168 reflogs = read_complete_reflog(branch);
169 if (!reflogs || reflogs->nr == 0)
170 die("No reflogs found for '%s'", branch);
171 path_list_insert(branch, &info->complete_reflogs)->util
172 = reflogs;
173 }
174
175 commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
176 if (recno < 0) {
177 commit_reflog->flag = 1;
178 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
179 if (commit_reflog->recno < 0) {
180 free(branch);
181 free(commit_reflog);
182 return;
183 }
184 } else
185 commit_reflog->recno = reflogs->nr - recno - 1;
186 commit_reflog->reflogs = reflogs;
187
188 add_commit_info(commit, commit_reflog, &info->reflogs);
189}
190
191void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
192{
193 struct commit_info *commit_info =
194 get_commit_info(commit, &info->reflogs, 0);
195 struct commit_reflog *commit_reflog;
196 struct reflog_info *reflog;
197
198 info->last_commit_reflog = NULL;
199 if (!commit_info)
200 return;
201
202 commit_reflog = commit_info->util;
203 if (commit_reflog->recno < 0) {
204 commit->parents = NULL;
205 return;
206 }
207
208 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
209 info->last_commit_reflog = commit_reflog;
210 commit_reflog->recno--;
211 commit_info->commit = (struct commit *)parse_object(reflog->osha1);
212 if (!commit_info->commit) {
213 commit->parents = NULL;
214 return;
215 }
216
217 commit->parents = xcalloc(sizeof(struct commit_list), 1);
218 commit->parents->item = commit_info->commit;
219 commit->object.flags &= ~(ADDED | SEEN | SHOWN);
220}
221
4d12a471 222void show_reflog_message(struct reflog_walk_info* info, int oneline)
8860fd42
JS
223{
224 if (info && info->last_commit_reflog) {
225 struct commit_reflog *commit_reflog = info->last_commit_reflog;
226 struct reflog_info *info;
227
4d12a471
JH
228 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
229 if (oneline) {
230 printf("%s@{", commit_reflog->reflogs->ref);
231 if (commit_reflog->flag)
232 printf("%s", show_date(info->timestamp, 0, 1));
233 else
234 printf("%d", commit_reflog->reflogs->nr
235 - 2 - commit_reflog->recno);
903b45fe 236 printf("}: %s", info->message);
4d12a471
JH
237 }
238 else {
239 printf("Reflog: %s@{", commit_reflog->reflogs->ref);
240 if (commit_reflog->flag)
241 printf("%s", show_rfc2822_date(info->timestamp,
242 info->tz));
243 else
244 printf("%d", commit_reflog->reflogs->nr
245 - 2 - commit_reflog->recno);
246 printf("} (%s)\nReflog message: %s",
247 info->email, info->message);
248 }
8860fd42
JS
249 }
250}