Make "insert_by_date()" match "commit_list_insert()"
[git/git.git] / commit.c
1 #include <ctype.h>
2 #include "tag.h"
3 #include "commit.h"
4 #include "cache.h"
5
6 const char *commit_type = "commit";
7
8 enum cmit_fmt get_commit_format(const char *arg)
9 {
10 if (!*arg)
11 return CMIT_FMT_DEFAULT;
12 if (!strcmp(arg, "=raw"))
13 return CMIT_FMT_RAW;
14 if (!strcmp(arg, "=medium"))
15 return CMIT_FMT_MEDIUM;
16 if (!strcmp(arg, "=short"))
17 return CMIT_FMT_SHORT;
18 if (!strcmp(arg, "=full"))
19 return CMIT_FMT_FULL;
20 die("invalid --pretty format");
21 }
22
23 static struct commit *check_commit(struct object *obj, const unsigned char *sha1)
24 {
25 if (obj->type != commit_type) {
26 error("Object %s is a %s, not a commit",
27 sha1_to_hex(sha1), obj->type);
28 return NULL;
29 }
30 return (struct commit *) obj;
31 }
32
33 struct commit *lookup_commit_reference(const unsigned char *sha1)
34 {
35 struct object *obj = parse_object(sha1);
36
37 if (!obj)
38 return NULL;
39 if (obj->type == tag_type)
40 obj = ((struct tag *)obj)->tagged;
41 return check_commit(obj, sha1);
42 }
43
44 struct commit *lookup_commit(const unsigned char *sha1)
45 {
46 struct object *obj = lookup_object(sha1);
47 if (!obj) {
48 struct commit *ret = xmalloc(sizeof(struct commit));
49 memset(ret, 0, sizeof(struct commit));
50 created_object(sha1, &ret->object);
51 ret->object.type = commit_type;
52 return ret;
53 }
54 if (!obj->type)
55 obj->type = commit_type;
56 return check_commit(obj, sha1);
57 }
58
59 static unsigned long parse_commit_date(const char *buf)
60 {
61 unsigned long date;
62
63 if (memcmp(buf, "author", 6))
64 return 0;
65 while (*buf++ != '\n')
66 /* nada */;
67 if (memcmp(buf, "committer", 9))
68 return 0;
69 while (*buf++ != '>')
70 /* nada */;
71 date = strtoul(buf, NULL, 10);
72 if (date == ULONG_MAX)
73 date = 0;
74 return date;
75 }
76
77 int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
78 {
79 void *bufptr = buffer;
80 unsigned char parent[20];
81 struct commit_list **pptr;
82
83 if (item->object.parsed)
84 return 0;
85 item->object.parsed = 1;
86 get_sha1_hex(bufptr + 5, parent);
87 item->tree = lookup_tree(parent);
88 if (item->tree)
89 add_ref(&item->object, &item->tree->object);
90 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
91 pptr = &item->parents;
92 while (!memcmp(bufptr, "parent ", 7) &&
93 !get_sha1_hex(bufptr + 7, parent)) {
94 struct commit *new_parent = lookup_commit(parent);
95 if (new_parent) {
96 pptr = &commit_list_insert(new_parent, pptr)->next;
97 add_ref(&item->object, &new_parent->object);
98 }
99 bufptr += 48;
100 }
101 item->date = parse_commit_date(bufptr);
102 return 0;
103 }
104
105 int parse_commit(struct commit *item)
106 {
107 char type[20];
108 void *buffer;
109 unsigned long size;
110 int ret;
111
112 if (item->object.parsed)
113 return 0;
114 buffer = read_sha1_file(item->object.sha1, type, &size);
115 if (!buffer)
116 return error("Could not read %s",
117 sha1_to_hex(item->object.sha1));
118 if (strcmp(type, commit_type)) {
119 free(buffer);
120 return error("Object %s not a commit",
121 sha1_to_hex(item->object.sha1));
122 }
123 ret = parse_commit_buffer(item, buffer, size);
124 if (!ret) {
125 item->buffer = buffer;
126 return 0;
127 }
128 free(buffer);
129 return ret;
130 }
131
132 struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
133 {
134 struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
135 new_list->item = item;
136 new_list->next = *list_p;
137 *list_p = new_list;
138 return new_list;
139 }
140
141 void free_commit_list(struct commit_list *list)
142 {
143 while (list) {
144 struct commit_list *temp = list;
145 list = temp->next;
146 free(temp);
147 }
148 }
149
150 struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
151 {
152 struct commit_list **pp = list;
153 struct commit_list *p;
154 while ((p = *pp) != NULL) {
155 if (p->item->date < item->date) {
156 break;
157 }
158 pp = &p->next;
159 }
160 return commit_list_insert(item, pp);
161 }
162
163
164 void sort_by_date(struct commit_list **list)
165 {
166 struct commit_list *ret = NULL;
167 while (*list) {
168 insert_by_date((*list)->item, &ret);
169 *list = (*list)->next;
170 }
171 *list = ret;
172 }
173
174 struct commit *pop_most_recent_commit(struct commit_list **list,
175 unsigned int mark)
176 {
177 struct commit *ret = (*list)->item;
178 struct commit_list *parents = ret->parents;
179 struct commit_list *old = *list;
180
181 *list = (*list)->next;
182 free(old);
183
184 while (parents) {
185 struct commit *commit = parents->item;
186 parse_commit(commit);
187 if (!(commit->object.flags & mark)) {
188 commit->object.flags |= mark;
189 insert_by_date(commit, list);
190 }
191 parents = parents->next;
192 }
193 return ret;
194 }
195
196 /*
197 * Generic support for pretty-printing the header
198 */
199 static int get_one_line(const char *msg, unsigned long len)
200 {
201 int ret = 0;
202
203 while (len--) {
204 char c = *msg++;
205 ret++;
206 if (c == '\n')
207 break;
208 if (!c)
209 return 0;
210 }
211 return ret;
212 }
213
214 static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const char *line)
215 {
216 char *date;
217 unsigned int namelen;
218 unsigned long time;
219 int tz, ret;
220
221 date = strchr(line, '>');
222 if (!date)
223 return 0;
224 namelen = ++date - line;
225 time = strtoul(date, &date, 10);
226 tz = strtol(date, NULL, 10);
227
228 ret = sprintf(buf, "%s: %.*s\n", what, namelen, line);
229 if (fmt == CMIT_FMT_MEDIUM)
230 ret += sprintf(buf + ret, "Date: %s\n", show_date(time, tz));
231 return ret;
232 }
233
234 static int is_empty_line(const char *line, int len)
235 {
236 while (len && isspace(line[len-1]))
237 len--;
238 return !len;
239 }
240
241 static int add_parent_info(enum cmit_fmt fmt, char *buf, const char *line, int parents)
242 {
243 int offset = 0;
244 switch (parents) {
245 case 1:
246 break;
247 case 2:
248 /* Go back to the previous line: 40 characters of previous parent, and one '\n' */
249 offset = sprintf(buf, "Merge: %.40s\n", line-41);
250 /* Fallthrough */
251 default:
252 /* Replace the previous '\n' with a space */
253 buf[offset-1] = ' ';
254 offset += sprintf(buf + offset, "%.40s\n", line+7);
255 }
256 return offset;
257 }
258
259 unsigned long pretty_print_commit(enum cmit_fmt fmt, const char *msg, unsigned long len, char *buf, unsigned long space)
260 {
261 int hdr = 1, body = 0;
262 unsigned long offset = 0;
263 int parents = 0;
264
265 for (;;) {
266 const char *line = msg;
267 int linelen = get_one_line(msg, len);
268
269 if (!linelen)
270 break;
271
272 /*
273 * We want some slop for indentation and a possible
274 * final "...". Thus the "+ 20".
275 */
276 if (offset + linelen + 20 > space) {
277 memcpy(buf + offset, " ...\n", 8);
278 offset += 8;
279 break;
280 }
281
282 msg += linelen;
283 len -= linelen;
284 if (hdr) {
285 if (linelen == 1) {
286 hdr = 0;
287 buf[offset++] = '\n';
288 continue;
289 }
290 if (fmt == CMIT_FMT_RAW) {
291 memcpy(buf + offset, line, linelen);
292 offset += linelen;
293 continue;
294 }
295 if (!memcmp(line, "parent ", 7)) {
296 if (linelen != 48)
297 die("bad parent line in commit");
298 offset += add_parent_info(fmt, buf + offset, line, ++parents);
299 }
300 if (!memcmp(line, "author ", 7))
301 offset += add_user_info("Author", fmt, buf + offset, line + 7);
302 if (fmt == CMIT_FMT_FULL) {
303 if (!memcmp(line, "committer ", 10))
304 offset += add_user_info("Commit", fmt, buf + offset, line + 10);
305 }
306 continue;
307 }
308
309 if (is_empty_line(line, linelen)) {
310 if (!body)
311 continue;
312 if (fmt == CMIT_FMT_SHORT)
313 break;
314 } else {
315 body = 1;
316 }
317 memset(buf + offset, ' ', 4);
318 memcpy(buf + offset + 4, line, linelen);
319 offset += linelen + 4;
320 }
321 /* Make sure there is an EOLN */
322 if (buf[offset - 1] != '\n')
323 buf[offset++] = '\n';
324 buf[offset] = '\0';
325 return offset;
326 }
327
328 struct commit *pop_commit(struct commit_list **stack)
329 {
330 struct commit_list *top = *stack;
331 struct commit *item = top ? top->item : NULL;
332
333 if (top) {
334 *stack = top->next;
335 free(top);
336 }
337 return item;
338 }
339
340 int count_parents(struct commit * commit)
341 {
342 int count = 0;
343 struct commit_list * parents = commit->parents;
344 for (count=0;parents; parents=parents->next,count++)
345 ;
346 return count;
347 }
348