aboutsummaryrefslogtreecommitdiff
path: root/commit.c
blob: 60047a06d376d4f1144af6a14efc059cec5d2843 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
#include <ctype.h>
#include "tag.h"
#include "commit.h"
#include "cache.h"

const char *commit_type = "commit";

static struct commit *check_commit(struct object *obj, const unsigned char *sha1)
{
	if (obj->type != commit_type) {
		error("Object %s is a %s, not a commit", 
		      sha1_to_hex(sha1), obj->type);
		return NULL;
	}
	return (struct commit *) obj;
}

struct commit *lookup_commit_reference(const unsigned char *sha1)
{
	struct object *obj = parse_object(sha1);

	if (!obj)
		return NULL;
	if (obj->type == tag_type)
		obj = ((struct tag *)obj)->tagged;
	return check_commit(obj, sha1);
}

struct commit *lookup_commit(const unsigned char *sha1)
{
	struct object *obj = lookup_object(sha1);
	if (!obj) {
		struct commit *ret = xmalloc(sizeof(struct commit));
		memset(ret, 0, sizeof(struct commit));
		created_object(sha1, &ret->object);
		ret->object.type = commit_type;
		return ret;
	}
	if (!obj->type)
		obj->type = commit_type;
	return check_commit(obj, sha1);
}

static unsigned long parse_commit_date(const char *buf)
{
	unsigned long date;

	if (memcmp(buf, "author", 6))
		return 0;
	while (*buf++ != '\n')
		/* nada */;
	if (memcmp(buf, "committer", 9))
		return 0;
	while (*buf++ != '>')
		/* nada */;
	date = strtoul(buf, NULL, 10);
	if (date == ULONG_MAX)
		date = 0;
	return date;
}

int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
{
	void *bufptr = buffer;
	unsigned char parent[20];

	if (item->object.parsed)
		return 0;
	item->object.parsed = 1;
	get_sha1_hex(bufptr + 5, parent);
	item->tree = lookup_tree(parent);
	if (item->tree)
		add_ref(&item->object, &item->tree->object);
	bufptr += 46; /* "tree " + "hex sha1" + "\n" */
	while (!memcmp(bufptr, "parent ", 7) &&
	       !get_sha1_hex(bufptr + 7, parent)) {
		struct commit *new_parent = lookup_commit(parent);
		if (new_parent) {
			commit_list_insert(new_parent, &item->parents);
			add_ref(&item->object, &new_parent->object);
		}
		bufptr += 48;
	}
	item->date = parse_commit_date(bufptr);
	return 0;
}

int parse_commit(struct commit *item)
{
	char type[20];
	void *buffer;
	unsigned long size;
	int ret;

	if (item->object.parsed)
		return 0;
	buffer = read_sha1_file(item->object.sha1, type, &size);
	if (!buffer)
		return error("Could not read %s",
			     sha1_to_hex(item->object.sha1));
	if (strcmp(type, commit_type)) {
		free(buffer);
		return error("Object %s not a commit",
			     sha1_to_hex(item->object.sha1));
	}
	ret = parse_commit_buffer(item, buffer, size);
	if (!ret) {
		item->buffer = buffer;
		return 0;
	}
	free(buffer);
	return ret;
}

struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
{
	struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
	new_list->item = item;
	new_list->next = *list_p;
	*list_p = new_list;
	return new_list;
}

void free_commit_list(struct commit_list *list)
{
	while (list) {
		struct commit_list *temp = list;
		list = temp->next;
		free(temp);
	}
}

void insert_by_date(struct commit_list **list, struct commit *item)
{
	struct commit_list **pp = list;
	struct commit_list *p;
	while ((p = *pp) != NULL) {
		if (p->item->date < item->date) {
			break;
		}
		pp = &p->next;
	}
	commit_list_insert(item, pp);
}

	
void sort_by_date(struct commit_list **list)
{
	struct commit_list *ret = NULL;
	while (*list) {
		insert_by_date(&ret, (*list)->item);
		*list = (*list)->next;
	}
	*list = ret;
}

struct commit *pop_most_recent_commit(struct commit_list **list,
				      unsigned int mark)
{
	struct commit *ret = (*list)->item;
	struct commit_list *parents = ret->parents;
	struct commit_list *old = *list;

	*list = (*list)->next;
	free(old);

	while (parents) {
		struct commit *commit = parents->item;
		parse_commit(commit);
		if (!(commit->object.flags & mark)) {
			commit->object.flags |= mark;
			insert_by_date(list, commit);
		}
		parents = parents->next;
	}
	return ret;
}

/*
 * Generic support for pretty-printing the header
 */
static int get_one_line(const char *msg, unsigned long len)
{
	int ret = 0;

	while (len--) {
		char c = *msg++;
		ret++;
		if (c == '\n')
			break;
		if (!c)
			return 0;
	}
	return ret;
}

static int add_author_info(enum cmit_fmt fmt, char *buf, const char *line, int len)
{
	char *date;
	unsigned int namelen;
	unsigned long time;
	int tz, ret;

	line += strlen("author ");
	date = strchr(line, '>');
	if (!date)
		return 0;
	namelen = ++date - line;
	time = strtoul(date, &date, 10);
	tz = strtol(date, NULL, 10);

	ret = sprintf(buf, "Author: %.*s\n", namelen, line);
	if (fmt == CMIT_FMT_MEDIUM)
		ret += sprintf(buf + ret, "Date:   %s\n", show_date(time, tz));
	return ret;
}

static int is_empty_line(const char *line, int len)
{
	while (len && isspace(line[len-1]))
		len--;
	return !len;
}

static int add_parent_info(enum cmit_fmt fmt, char *buf, const char *line, int parents)
{
	int offset = 0;
	switch (parents) {
	case 1:
		break;
	case 2:
		/* Go back to the previous line: 40 characters of previous parent, and one '\n' */
		offset = sprintf(buf, "Merge: %.40s\n", line-41);
		/* Fallthrough */
	default:
		/* Replace the previous '\n' with a space */
		buf[offset-1] = ' ';
		offset += sprintf(buf + offset, "%.40s\n", line+7);
	}
	return offset;
}

unsigned long pretty_print_commit(enum cmit_fmt fmt, const char *msg, unsigned long len, char *buf, unsigned long space)
{
	int hdr = 1, body = 0;
	unsigned long offset = 0;
	int parents = 0;

	for (;;) {
		const char *line = msg;
		int linelen = get_one_line(msg, len);

		if (!linelen)
			break;

		/*
		 * We want some slop for indentation and a possible
		 * final "...". Thus the "+ 20".
		 */
		if (offset + linelen + 20 > space) {
			memcpy(buf + offset, "    ...\n", 8);
			offset += 8;
			break;
		}

		msg += linelen;
		len -= linelen;
		if (hdr) {
			if (linelen == 1) {
				hdr = 0;
				buf[offset++] = '\n';
				continue;
			}
			if (fmt == CMIT_FMT_RAW) {
				memcpy(buf + offset, line, linelen);
				offset += linelen;
				continue;
			}
			if (!memcmp(line, "parent ", 7)) {
				if (linelen != 48)
					die("bad parent line in commit");
				offset += add_parent_info(fmt, buf + offset, line, ++parents);
			}
			if (!memcmp(line, "author ", 7))
				offset += add_author_info(fmt, buf + offset, line, linelen);
			continue;
		}

		if (is_empty_line(line, linelen)) {
			if (!body)
				continue;
			if (fmt == CMIT_FMT_SHORT)
				break;
		} else {
			body = 1;
		}
		memset(buf + offset, ' ', 4);
		memcpy(buf + offset + 4, line, linelen);
		offset += linelen + 4;
	}
	/* Make sure there is an EOLN */
	if (buf[offset - 1] != '\n')
		buf[offset++] = '\n';
	buf[offset] = '\0';
	return offset;
}

struct commit *pop_commit(struct commit_list **stack)
{
	struct commit_list *top = *stack;
	struct commit *item = top ? top->item : NULL;

	if (top) {
		*stack = top->next;
		free(top);
	}
	return item;
}

int count_parents(struct commit * commit)
{
        int count = 0;
        struct commit_list * parents = commit->parents;
        for (count=0;parents; parents=parents->next,count++)
          ;
        return count;
}