[thirdparty/git.git] / revision.c

#include "cache.h"
#include "tag.h"
#include "blob.h"
#include "tree.h"
#include "commit.h"
#include "refs.h"
#include "revision.h"

static char *path_name(struct name_path *path, const char *name)
{
	struct name_path *p;
	char *n, *m;
	int nlen = strlen(name);
	int len = nlen + 1;

	for (p = path; p; p = p->up) {
		if (p->elem_len)
			len += p->elem_len + 1;
	}
	n = xmalloc(len);
	m = n + len - (nlen + 1);
	strcpy(m, name);
	for (p = path; p; p = p->up) {
		if (p->elem_len) {
			m -= p->elem_len + 1;
			memcpy(m, p->elem, p->elem_len);
			m[p->elem_len] = '/';
		}
	}
	return n;
}

struct object_list **add_object(struct object *obj,
				       struct object_list **p,
				       struct name_path *path,
				       const char *name)
{
	struct object_list *entry = xmalloc(sizeof(*entry));
	entry->item = obj;
	entry->next = *p;
	entry->name = path_name(path, name);
	*p = entry;
	return &entry->next;
}

static void mark_blob_uninteresting(struct blob *blob)
{
	if (blob->object.flags & UNINTERESTING)
		return;
	blob->object.flags |= UNINTERESTING;
}

void mark_tree_uninteresting(struct tree *tree)
{
	struct object *obj = &tree->object;
	struct tree_entry_list *entry;

	if (obj->flags & UNINTERESTING)
		return;
	obj->flags |= UNINTERESTING;
	if (!has_sha1_file(obj->sha1))
		return;
	if (parse_tree(tree) < 0)
		die("bad tree %s", sha1_to_hex(obj->sha1));
	entry = tree->entries;
	tree->entries = NULL;
	while (entry) {
		struct tree_entry_list *next = entry->next;
		if (entry->directory)
			mark_tree_uninteresting(entry->item.tree);
		else
			mark_blob_uninteresting(entry->item.blob);
		free(entry);
		entry = next;
	}
}

void mark_parents_uninteresting(struct commit *commit)
{
	struct commit_list *parents = commit->parents;

	while (parents) {
		struct commit *commit = parents->item;
		commit->object.flags |= UNINTERESTING;

		/*
		 * Normally we haven't parsed the parent
		 * yet, so we won't have a parent of a parent
		 * here. However, it may turn out that we've
		 * reached this commit some other way (where it
		 * wasn't uninteresting), in which case we need
		 * to mark its parents recursively too..
		 */
		if (commit->parents)
			mark_parents_uninteresting(commit);

		/*
		 * A missing commit is ok iff its parent is marked
		 * uninteresting.
		 *
		 * We just mark such a thing parsed, so that when
		 * it is popped next time around, we won't be trying
		 * to parse it and get an error.
		 */
		if (!has_sha1_file(commit->object.sha1))
			commit->object.parsed = 1;
		parents = parents->next;
	}
}

static void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
{
	add_object(obj, &revs->pending_objects, NULL, name);
}

static struct commit *get_commit_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
{
	struct object *object;

	object = parse_object(sha1);
	if (!object)
		die("bad object %s", name);

	/*
	 * Tag object? Look what it points to..
	 */
	while (object->type == tag_type) {
		struct tag *tag = (struct tag *) object;
		object->flags |= flags;
		if (revs->tag_objects && !(object->flags & UNINTERESTING))
			add_pending_object(revs, object, tag->tag);
		object = parse_object(tag->tagged->sha1);
		if (!object)
			die("bad object %s", sha1_to_hex(tag->tagged->sha1));
	}

	/*
	 * Commit object? Just return it, we'll do all the complex
	 * reachability crud.
	 */
	if (object->type == commit_type) {
		struct commit *commit = (struct commit *)object;
		object->flags |= flags;
		if (parse_commit(commit) < 0)
			die("unable to parse commit %s", name);
		if (flags & UNINTERESTING)
			mark_parents_uninteresting(commit);
		return commit;
	}

	/*
	 * Tree object? Either mark it uniniteresting, or add it
	 * to the list of objects to look at later..
	 */
	if (object->type == tree_type) {
		struct tree *tree = (struct tree *)object;
		if (!revs->tree_objects)
			return NULL;
		if (flags & UNINTERESTING) {
			mark_tree_uninteresting(tree);
			return NULL;
		}
		add_pending_object(revs, object, "");
		return NULL;
	}

	/*
	 * Blob object? You know the drill by now..
	 */
	if (object->type == blob_type) {
		struct blob *blob = (struct blob *)object;
		if (!revs->blob_objects)
			return NULL;
		if (flags & UNINTERESTING) {
			mark_blob_uninteresting(blob);
			return NULL;
		}
		add_pending_object(revs, object, "");
		return NULL;
	}
	die("%s is unknown object", name);
}

static void add_one_commit(struct commit *commit, struct rev_info *revs)
{
	if (!commit || (commit->object.flags & SEEN))
		return;
	commit->object.flags |= SEEN;
	commit_list_insert(commit, &revs->commits);
}

static int all_flags;
static struct rev_info *all_revs;

static int handle_one_ref(const char *path, const unsigned char *sha1)
{
	struct commit *commit = get_commit_reference(all_revs, path, sha1, all_flags);
	add_one_commit(commit, all_revs);
	return 0;
}

static void handle_all(struct rev_info *revs, unsigned flags)
{
	all_revs = revs;
	all_flags = flags;
	for_each_ref(handle_one_ref);
}

/*
 * Parse revision information, filling in the "rev_info" structure,
 * and removing the used arguments from the argument list.
 *
 * Returns the number of arguments left ("new argc").
 */
int setup_revisions(int argc, const char **argv, struct rev_info *revs)
{
	int i, flags, seen_dashdash;
	const char *def = NULL;
	const char **unrecognized = argv+1;
	int left = 1;

	memset(revs, 0, sizeof(*revs));
	revs->lifo = 1;
	revs->dense = 1;
	revs->prefix = setup_git_directory();
	revs->max_age = -1;
	revs->min_age = -1;
	revs->max_count = -1;

	/* First, search for "--" */
	seen_dashdash = 0;
	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];
		if (strcmp(arg, "--"))
			continue;
		argv[i] = NULL;
		argc = i;
		revs->paths = get_pathspec(revs->prefix, argv + i + 1);
		seen_dashdash = 1;
		break;
	}

	flags = 0;
	for (i = 1; i < argc; i++) {
		struct commit *commit;
		const char *arg = argv[i];
		unsigned char sha1[20];
		char *dotdot;
		int local_flags;

		if (*arg == '-') {
			if (!strncmp(arg, "--max-count=", 12)) {
				revs->max_count = atoi(arg + 12);
				continue;
			}
			if (!strncmp(arg, "--max-age=", 10)) {
				revs->max_age = atoi(arg + 10);
				continue;
			}
			if (!strncmp(arg, "--min-age=", 10)) {
				revs->min_age = atoi(arg + 10);
				continue;
			}
			if (!strcmp(arg, "--all")) {
				handle_all(revs, flags);
				continue;
			}
			if (!strcmp(arg, "--not")) {
				flags ^= UNINTERESTING;
				continue;
			}
			if (!strcmp(arg, "--default")) {
				if (++i >= argc)
					die("bad --default argument");
				def = argv[i];
				continue;
			}
			if (!strcmp(arg, "--topo-order")) {
				revs->topo_order = 1;
				continue;
			}
			if (!strcmp(arg, "--date-order")) {
				revs->lifo = 0;
				revs->topo_order = 1;
				continue;
			}
			if (!strcmp(arg, "--dense")) {
				revs->dense = 1;
				continue;
			}
			if (!strcmp(arg, "--sparse")) {
				revs->dense = 0;
				continue;
			}
			if (!strcmp(arg, "--remove-empty")) {
				revs->remove_empty_trees = 1;
				continue;
			}
			if (!strcmp(arg, "--objects")) {
				revs->tag_objects = 1;
				revs->tree_objects = 1;
				revs->blob_objects = 1;
				continue;
			}
			if (!strcmp(arg, "--objects-edge")) {
				revs->tag_objects = 1;
				revs->tree_objects = 1;
				revs->blob_objects = 1;
				revs->edge_hint = 1;
				continue;
			}
			*unrecognized++ = arg;
			left++;
			continue;
		}
		dotdot = strstr(arg, "..");
		if (dotdot) {
			unsigned char from_sha1[20];
			char *next = dotdot + 2;
			*dotdot = 0;
			if (!*next)
				next = "HEAD";
			if (!get_sha1(arg, from_sha1) && !get_sha1(next, sha1)) {
				struct commit *exclude;
				struct commit *include;

				exclude = get_commit_reference(revs, arg, from_sha1, flags ^ UNINTERESTING);
				include = get_commit_reference(revs, next, sha1, flags);
				if (!exclude || !include)
					die("Invalid revision range %s..%s", arg, next);
				add_one_commit(exclude, revs);
				add_one_commit(include, revs);
				continue;
			}
			*dotdot = '.';
		}
		local_flags = 0;
		if (*arg == '^') {
			local_flags = UNINTERESTING;
			arg++;
		}
		if (get_sha1(arg, sha1) < 0) {
			struct stat st;
			int j;

			if (seen_dashdash || local_flags)
				die("bad revision '%s'", arg);

			/* If we didn't have a "--", all filenames must exist */
			for (j = i; j < argc; j++) {
				if (lstat(argv[j], &st) < 0)
					die("'%s': %s", arg, strerror(errno));
			}
			revs->paths = get_pathspec(revs->prefix, argv + i);
			break;
		}
		commit = get_commit_reference(revs, arg, sha1, flags ^ local_flags);
		add_one_commit(commit, revs);
	}
	if (def && !revs->commits) {
		unsigned char sha1[20];
		struct commit *commit;
		if (get_sha1(def, sha1) < 0)
			die("bad default revision '%s'", def);
		commit = get_commit_reference(revs, def, sha1, 0);
		add_one_commit(commit, revs);
	}
	*unrecognized = NULL;
	return left;
}
Commit	Line	Data
ae563542 LT	1	#include "cache.h"
	2	#include "tag.h"
	3	#include "blob.h"
	4	#include "tree.h"
	5	#include "commit.h"
	6	#include "refs.h"
	7	#include "revision.h"
	8
	9	static char path_name(struct name_path path, const char *name)
	10	{
	11	struct name_path *p;
	12	char n, m;
	13	int nlen = strlen(name);
	14	int len = nlen + 1;
	15
	16	for (p = path; p; p = p->up) {
	17	if (p->elem_len)
	18	len += p->elem_len + 1;
	19	}
	20	n = xmalloc(len);
	21	m = n + len - (nlen + 1);
	22	strcpy(m, name);
	23	for (p = path; p; p = p->up) {
	24	if (p->elem_len) {
	25	m -= p->elem_len + 1;
	26	memcpy(m, p->elem, p->elem_len);
	27	m[p->elem_len] = '/';
	28	}
	29	}
	30	return n;
	31	}
	32
	33	struct object_list *add_object(struct object obj,
	34	struct object_list **p,
	35	struct name_path *path,
	36	const char *name)
	37	{
	38	struct object_list entry = xmalloc(sizeof(entry));
	39	entry->item = obj;
	40	entry->next = *p;
	41	entry->name = path_name(path, name);
	42	*p = entry;
	43	return &entry->next;
	44	}
	45
	46	static void mark_blob_uninteresting(struct blob *blob)
	47	{
	48	if (blob->object.flags & UNINTERESTING)
	49	return;
	50	blob->object.flags \|= UNINTERESTING;
	51	}
	52
	53	void mark_tree_uninteresting(struct tree *tree)
	54	{
	55	struct object *obj = &tree->object;
	56	struct tree_entry_list *entry;
	57
	58	if (obj->flags & UNINTERESTING)
	59	return;
	60	obj->flags \|= UNINTERESTING;
	61	if (!has_sha1_file(obj->sha1))
	62	return;
	63	if (parse_tree(tree) < 0)
	64	die("bad tree %s", sha1_to_hex(obj->sha1));
65	entry = tree->entries;
66	tree->entries = NULL;
67	while (entry) {
68	struct tree_entry_list *next = entry->next;
69	if (entry->directory)
70	mark_tree_uninteresting(entry->item.tree);
71	else
72	mark_blob_uninteresting(entry->item.blob);
73	free(entry);
74	entry = next;
75	}
76	}
77
78	void mark_parents_uninteresting(struct commit *commit)
79	{
80	struct commit_list *parents = commit->parents;
81
82	while (parents) {
83	struct commit *commit = parents->item;
84	commit->object.flags \|= UNINTERESTING;
85
86	/*
87	* Normally we haven't parsed the parent
88	* yet, so we won't have a parent of a parent
89	* here. However, it may turn out that we've
90	* reached this commit some other way (where it
91	* wasn't uninteresting), in which case we need
92	* to mark its parents recursively too..
93	*/
94	if (commit->parents)
95	mark_parents_uninteresting(commit);
96
97	/*
98	* A missing commit is ok iff its parent is marked
99	* uninteresting.
100	*
101	* We just mark such a thing parsed, so that when
102	* it is popped next time around, we won't be trying
103	* to parse it and get an error.
104	*/
105	if (!has_sha1_file(commit->object.sha1))
106	commit->object.parsed = 1;
107	parents = parents->next;
108	}
109	}
110
111	static void add_pending_object(struct rev_info revs, struct object obj, const char *name)
112	{
113	add_object(obj, &revs->pending_objects, NULL, name);
114	}
115
116	static struct commit get_commit_reference(struct rev_info revs, const char name, const unsigned char sha1, unsigned int flags)
117	{
118	struct object *object;
119
120	object = parse_object(sha1);
121	if (!object)
122	die("bad object %s", name);
123
124	/*
125	* Tag object? Look what it points to..
126	*/
127	while (object->type == tag_type) {
128	struct tag tag = (struct tag ) object;
129	object->flags \|= flags;
130	if (revs->tag_objects && !(object->flags & UNINTERESTING))
131	add_pending_object(revs, object, tag->tag);
132	object = parse_object(tag->tagged->sha1);
133	if (!object)
134	die("bad object %s", sha1_to_hex(tag->tagged->sha1));
135	}
136
137	/*
138	* Commit object? Just return it, we'll do all the complex
139	* reachability crud.
140	*/
141	if (object->type == commit_type) {
142	struct commit commit = (struct commit )object;
143	object->flags \|= flags;
144	if (parse_commit(commit) < 0)
145	die("unable to parse commit %s", name);
146	if (flags & UNINTERESTING)
147	mark_parents_uninteresting(commit);
148	return commit;
149	}
150
151	/*
152	* Tree object? Either mark it uniniteresting, or add it
153	* to the list of objects to look at later..
154	*/
155	if (object->type == tree_type) {
156	struct tree tree = (struct tree )object;
157	if (!revs->tree_objects)
158	return NULL;
159	if (flags & UNINTERESTING) {
160	mark_tree_uninteresting(tree);
161	return NULL;
162	}
163	add_pending_object(revs, object, "");
164	return NULL;
165	}
166
167	/*
168	* Blob object? You know the drill by now..
169	*/
170	if (object->type == blob_type) {
171	struct blob blob = (struct blob )object;
172	if (!revs->blob_objects)
173	return NULL;
174	if (flags & UNINTERESTING) {
175	mark_blob_uninteresting(blob);
176	return NULL;
177	}
178	add_pending_object(revs, object, "");
179	return NULL;
180	}
181	die("%s is unknown object", name);
182	}
183
184	static void add_one_commit(struct commit commit, struct rev_info revs)
185	{
186	if (!commit \|\| (commit->object.flags & SEEN))
187	return;
188	commit->object.flags \|= SEEN;
189	commit_list_insert(commit, &revs->commits);
190	}
191
192	static int all_flags;
193	static struct rev_info *all_revs;
194
195	static int handle_one_ref(const char path, const unsigned char sha1)
196	{
197	struct commit *commit = get_commit_reference(all_revs, path, sha1, all_flags);
198	add_one_commit(commit, all_revs);
199	return 0;
200	}
201
202	static void handle_all(struct rev_info *revs, unsigned flags)
203	{
204	all_revs = revs;
205	all_flags = flags;
206	for_each_ref(handle_one_ref);
207	}
208
209	/*
210	* Parse revision information, filling in the "rev_info" structure,
211	* and removing the used arguments from the argument list.
212	*
213	* Returns the number of arguments left ("new argc").
214	*/
215	int setup_revisions(int argc, const char *argv, struct rev_info revs)
216	{
217	int i, flags, seen_dashdash;
218	const char *def = NULL;
219	const char **unrecognized = argv+1;
220	int left = 1;
221
222	memset(revs, 0, sizeof(*revs));
223	revs->lifo = 1;
224	revs->dense = 1;
225	revs->prefix = setup_git_directory();
226	revs->max_age = -1;
227	revs->min_age = -1;
228	revs->max_count = -1;
229
230	/* First, search for "--" */
231	seen_dashdash = 0;
232	for (i = 1; i < argc; i++) {
233	const char *arg = argv[i];
234	if (strcmp(arg, "--"))
235	continue;
236	argv[i] = NULL;
237	argc = i;
238	revs->paths = get_pathspec(revs->prefix, argv + i + 1);
239	seen_dashdash = 1;
240	break;
241	}
242
243	flags = 0;
244	for (i = 1; i < argc; i++) {
245	struct commit *commit;
246	const char *arg = argv[i];
247	unsigned char sha1[20];
248	char *dotdot;
249	int local_flags;
250
251	if (*arg == '-') {
252	if (!strncmp(arg, "--max-count=", 12)) {
253	revs->max_count = atoi(arg + 12);
254	continue;
255	}
256	if (!strncmp(arg, "--max-age=", 10)) {
257	revs->max_age = atoi(arg + 10);
258	continue;
259	}
260	if (!strncmp(arg, "--min-age=", 10)) {
261	revs->min_age = atoi(arg + 10);
262	continue;
263	}
264	if (!strcmp(arg, "--all")) {
265	handle_all(revs, flags);
266	continue;
267	}
268	if (!strcmp(arg, "--not")) {
269	flags ^= UNINTERESTING;
270	continue;
271	}
272	if (!strcmp(arg, "--default")) {
273	if (++i >= argc)
274	die("bad --default argument");
275	def = argv[i];
276	continue;
277	}
278	if (!strcmp(arg, "--topo-order")) {
279	revs->topo_order = 1;
280	continue;
281	}
282	if (!strcmp(arg, "--date-order")) {
283	revs->lifo = 0;
284	revs->topo_order = 1;
285	continue;
286	}
287	if (!strcmp(arg, "--dense")) {
288	revs->dense = 1;
289	continue;
290	}
291	if (!strcmp(arg, "--sparse")) {
292	revs->dense = 0;
293	continue;
294	}
295	if (!strcmp(arg, "--remove-empty")) {
296	revs->remove_empty_trees = 1;
297	continue;
298	}
299	if (!strcmp(arg, "--objects")) {
300	revs->tag_objects = 1;
301	revs->tree_objects = 1;
302	revs->blob_objects = 1;
303	continue;
304	}
305	if (!strcmp(arg, "--objects-edge")) {
306	revs->tag_objects = 1;
307	revs->tree_objects = 1;
308	revs->blob_objects = 1;
309	revs->edge_hint = 1;
310	continue;
311	}
312	*unrecognized++ = arg;
313	left++;
314	continue;
315	}
316	dotdot = strstr(arg, "..");
317	if (dotdot) {
318	unsigned char from_sha1[20];
319	char *next = dotdot + 2;
320	*dotdot = 0;
321	if (!*next)
322	next = "HEAD";
323	if (!get_sha1(arg, from_sha1) && !get_sha1(next, sha1)) {
324	struct commit *exclude;
325	struct commit *include;
326
327	exclude = get_commit_reference(revs, arg, from_sha1, flags ^ UNINTERESTING);
328	include = get_commit_reference(revs, next, sha1, flags);
329	if (!exclude \|\| !include)
330	die("Invalid revision range %s..%s", arg, next);
331	add_one_commit(exclude, revs);
332	add_one_commit(include, revs);
333	continue;
334	}
335	*dotdot = '.';
336	}
337	local_flags = 0;
338	if (*arg == '^') {
339	local_flags = UNINTERESTING;
340	arg++;
341	}
342	if (get_sha1(arg, sha1) < 0) {
343	struct stat st;
344	int j;
345
346	if (seen_dashdash \|\| local_flags)
347	die("bad revision '%s'", arg);
348
349	/* If we didn't have a "--", all filenames must exist */
350	for (j = i; j < argc; j++) {
351	if (lstat(argv[j], &st) < 0)
352	die("'%s': %s", arg, strerror(errno));
353	}
354	revs->paths = get_pathspec(revs->prefix, argv + i);
355	break;
356	}
357	commit = get_commit_reference(revs, arg, sha1, flags ^ local_flags);
358	add_one_commit(commit, revs);
359	}
360	if (def && !revs->commits) {
361	unsigned char sha1[20];
362	struct commit *commit;
363	if (get_sha1(def, sha1) < 0)
364	die("bad default revision '%s'", def);
365	commit = get_commit_reference(revs, def, sha1, 0);
366	add_one_commit(commit, revs);
367	}
368	*unrecognized = NULL;
369	return left;
370	}