git-shortlog: add name translations for 'sparse' repo
[git/git.git] / commit.c
CommitLineData
961784ee 1#include "tag.h"
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2#include "commit.h"
3#include "cache.h"
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4
5const char *commit_type = "commit";
6
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LT
7static struct commit *check_commit(struct object *obj, unsigned char *sha1)
8{
9 if (obj->type != commit_type) {
10 error("Object %s is a %s, not a commit",
11 sha1_to_hex(sha1), obj->type);
12 return NULL;
13 }
14 return (struct commit *) obj;
15}
16
17struct commit *lookup_commit_reference(unsigned char *sha1)
18{
19 struct object *obj = parse_object(sha1);
20
21 if (!obj)
22 return NULL;
23 if (obj->type == tag_type)
24 obj = ((struct tag *)obj)->tagged;
25 return check_commit(obj, sha1);
26}
27
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28struct commit *lookup_commit(unsigned char *sha1)
29{
30 struct object *obj = lookup_object(sha1);
31 if (!obj) {
812666c8 32 struct commit *ret = xmalloc(sizeof(struct commit));
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33 memset(ret, 0, sizeof(struct commit));
34 created_object(sha1, &ret->object);
d32987be 35 ret->object.type = commit_type;
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36 return ret;
37 }
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38 if (!obj->type)
39 obj->type = commit_type;
961784ee 40 return check_commit(obj, sha1);
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41}
42
43static unsigned long parse_commit_date(const char *buf)
44{
45 unsigned long date;
46
47 if (memcmp(buf, "author", 6))
48 return 0;
49 while (*buf++ != '\n')
50 /* nada */;
51 if (memcmp(buf, "committer", 9))
52 return 0;
53 while (*buf++ != '>')
54 /* nada */;
55 date = strtoul(buf, NULL, 10);
56 if (date == ULONG_MAX)
57 date = 0;
58 return date;
59}
60
bd2c39f5 61int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
175785e5 62{
bd2c39f5 63 void *bufptr = buffer;
175785e5 64 unsigned char parent[20];
bd2c39f5 65
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66 if (item->object.parsed)
67 return 0;
68 item->object.parsed = 1;
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69 get_sha1_hex(bufptr + 5, parent);
70 item->tree = lookup_tree(parent);
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LT
71 if (item->tree)
72 add_ref(&item->object, &item->tree->object);
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73 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
74 while (!memcmp(bufptr, "parent ", 7) &&
75 !get_sha1_hex(bufptr + 7, parent)) {
dd97f850 76 struct commit *new_parent = lookup_commit(parent);
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77 if (new_parent) {
78 commit_list_insert(new_parent, &item->parents);
79 add_ref(&item->object, &new_parent->object);
80 }
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81 bufptr += 48;
82 }
83 item->date = parse_commit_date(bufptr);
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84 return 0;
85}
86
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87int parse_commit(struct commit *item)
88{
89 char type[20];
90 void *buffer;
91 unsigned long size;
92 int ret;
93
94 if (item->object.parsed)
95 return 0;
96 buffer = read_sha1_file(item->object.sha1, type, &size);
97 if (!buffer)
98 return error("Could not read %s",
99 sha1_to_hex(item->object.sha1));
100 if (strcmp(type, commit_type)) {
101 free(buffer);
102 return error("Object %s not a commit",
103 sha1_to_hex(item->object.sha1));
104 }
105 ret = parse_commit_buffer(item, buffer, size);
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106 if (!ret) {
107 item->buffer = buffer;
108 return 0;
109 }
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110 free(buffer);
111 return ret;
112}
113
ac5155ef 114struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
dd97f850 115{
812666c8 116 struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
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117 new_list->item = item;
118 new_list->next = *list_p;
119 *list_p = new_list;
ac5155ef 120 return new_list;
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121}
122
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123void free_commit_list(struct commit_list *list)
124{
125 while (list) {
126 struct commit_list *temp = list;
127 list = temp->next;
128 free(temp);
129 }
130}
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131
132static void insert_by_date(struct commit_list **list, struct commit *item)
133{
134 struct commit_list **pp = list;
135 struct commit_list *p;
136 while ((p = *pp) != NULL) {
137 if (p->item->date < item->date) {
138 break;
139 }
140 pp = &p->next;
141 }
142 commit_list_insert(item, pp);
143}
144
145
146void sort_by_date(struct commit_list **list)
147{
148 struct commit_list *ret = NULL;
149 while (*list) {
150 insert_by_date(&ret, (*list)->item);
151 *list = (*list)->next;
152 }
153 *list = ret;
154}
155
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156struct commit *pop_most_recent_commit(struct commit_list **list,
157 unsigned int mark)
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158{
159 struct commit *ret = (*list)->item;
160 struct commit_list *parents = ret->parents;
161 struct commit_list *old = *list;
162
163 *list = (*list)->next;
164 free(old);
165
166 while (parents) {
4056c091 167 struct commit *commit = parents->item;
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168 parse_commit(commit);
169 if (!(commit->object.flags & mark)) {
170 commit->object.flags |= mark;
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171 insert_by_date(list, commit);
172 }
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173 parents = parents->next;
174 }
175 return ret;
176}
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LT
177
178/*
179 * Generic support for pretty-printing the header
180 */
181static int get_one_line(const char *msg, unsigned long len)
182{
183 int ret = 0;
184
185 while (len--) {
186 char c = *msg++;
187 ret++;
188 if (c == '\n')
189 break;
190 if (!c)
191 return 0;
192 }
193 return ret;
194}
195
196static int add_author_info(char *buf, const char *line, int len)
197{
198 char *date;
199 unsigned int namelen;
200 unsigned long time;
201 int tz;
202
203 line += strlen("author ");
204 date = strchr(line, '>');
205 if (!date)
206 return 0;
207 namelen = ++date - line;
208 time = strtoul(date, &date, 10);
209 tz = strtol(date, NULL, 10);
210
211 return sprintf(buf, "Author: %.*s\nDate: %s\n",
212 namelen, line,
213 show_date(time, tz));
214}
215
216unsigned long pretty_print_commit(const char *msg, unsigned long len, char *buf, unsigned long space)
217{
218 int hdr = 1;
219 unsigned long offset = 0;
220
221 for (;;) {
222 const char *line = msg;
223 int linelen = get_one_line(msg, len);
224
225 if (!linelen)
226 break;
227
228 /*
229 * We want some slop for indentation and a possible
230 * final "...". Thus the "+ 20".
231 */
232 if (offset + linelen + 20 > space) {
233 memcpy(buf + offset, " ...\n", 8);
234 offset += 8;
235 break;
236 }
237
238 msg += linelen;
239 len -= linelen;
240 if (linelen == 1)
241 hdr = 0;
242 if (hdr) {
243 if (!memcmp(line, "author ", 7))
244 offset += add_author_info(buf + offset, line, linelen);
245 continue;
246 }
247 memset(buf + offset, ' ', 4);
248 memcpy(buf + offset + 4, line, linelen);
249 offset += linelen + 4;
250 }
251 /* Make sure there is an EOLN */
252 if (buf[offset - 1] != '\n')
253 buf[offset++] = '\n';
254 buf[offset] = '\0';
255 return offset;
256}