gitk: Second try to work around the command line limit on Windows
[git/dscho.git] / reflog-walk.c
blobcaba4f743f2dcc1cf7046cec294f242b2af19052
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 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));
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;
45 static struct complete_reflogs *read_complete_reflog(const char *ref)
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);
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 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));
118 info = lifo->items + lifo->nr;
119 info->commit = commit;
120 info->util = util;
121 lifo->nr++;
124 struct commit_reflog {
125 int flag, recno;
126 struct complete_reflogs *reflogs;
129 struct reflog_walk_info {
130 struct commit_info_lifo reflogs;
131 struct string_list complete_reflogs;
132 struct commit_reflog *last_commit_reflog;
135 void init_reflog_walk(struct reflog_walk_info** info)
137 *info = xcalloc(sizeof(struct reflog_walk_info), 1);
140 int add_reflog_for_walk(struct reflog_walk_info *info,
141 struct commit *commit, const char *name)
143 unsigned long timestamp = 0;
144 int recno = -1;
145 struct string_list_item *item;
146 struct complete_reflogs *reflogs;
147 char *branch, *at = strchr(name, '@');
148 struct commit_reflog *commit_reflog;
150 if (commit->object.flags & UNINTERESTING)
151 die ("Cannot walk reflogs for %s", name);
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);
162 } else
163 recno = 0;
165 item = string_list_lookup(branch, &info->complete_reflogs);
166 if (item)
167 reflogs = item->util;
168 else {
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);
177 reflogs = read_complete_reflog(branch);
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);
186 free(branch);
187 branch = b;
188 reflogs = read_complete_reflog(branch);
191 if (!reflogs || reflogs->nr == 0)
192 return -1;
193 string_list_insert(branch, &info->complete_reflogs)->util
194 = reflogs;
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);
204 return -1;
206 } else
207 commit_reflog->recno = reflogs->nr - recno - 1;
208 commit_reflog->reflogs = reflogs;
210 add_commit_info(commit, commit_reflog, &info->reflogs);
211 return 0;
214 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
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;
221 info->last_commit_reflog = NULL;
222 if (!commit_info)
223 return;
225 commit_reflog = commit_info->util;
226 if (commit_reflog->recno < 0) {
227 commit->parents = NULL;
228 return;
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;
240 commit->parents = xcalloc(sizeof(struct commit_list), 1);
241 commit->parents->item = commit_info->commit;
242 commit->object.flags &= ~(ADDED | SEEN | SHOWN);
245 void get_reflog_selector(struct strbuf *sb,
246 struct reflog_walk_info *reflog_info,
247 enum date_mode dmode,
248 int shorten)
250 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
251 struct reflog_info *info;
252 const char *printed_ref;
254 if (!commit_reflog)
255 return;
257 if (shorten) {
258 if (!commit_reflog->reflogs->short_ref)
259 commit_reflog->reflogs->short_ref
260 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
261 printed_ref = commit_reflog->reflogs->short_ref;
262 } else {
263 printed_ref = commit_reflog->reflogs->ref;
266 strbuf_addf(sb, "%s@{", printed_ref);
267 if (commit_reflog->flag || dmode) {
268 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
269 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
270 } else {
271 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
272 - 2 - commit_reflog->recno);
275 strbuf_addch(sb, '}');
278 void get_reflog_message(struct strbuf *sb,
279 struct reflog_walk_info *reflog_info)
281 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
282 struct reflog_info *info;
283 size_t len;
285 if (!commit_reflog)
286 return;
288 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
289 len = strlen(info->message);
290 if (len > 0)
291 len--; /* strip away trailing newline */
292 strbuf_add(sb, info->message, len);
295 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
296 enum date_mode dmode)
298 if (reflog_info && reflog_info->last_commit_reflog) {
299 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
300 struct reflog_info *info;
301 struct strbuf selector = STRBUF_INIT;
303 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
304 get_reflog_selector(&selector, reflog_info, dmode, 0);
305 if (oneline) {
306 printf("%s: %s", selector.buf, info->message);
308 else {
309 printf("Reflog: %s (%s)\nReflog message: %s",
310 selector.buf, info->email, info->message);
313 strbuf_release(&selector);