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#include "cache.h"
#include "cache-tree.h"
#include "tree.h"
#include "blob.h"
#include "commit.h"
#include "tag.h"
#include "tree-walk.h"

const char *tree_type = "tree";

static int read_one_entry_opt(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, int opt)
{
	int len;
	unsigned int size;
	struct cache_entry *ce;

	if (S_ISDIR(mode))
		return READ_TREE_RECURSIVE;

	len = strlen(pathname);
	size = cache_entry_size(baselen + len);
	ce = xcalloc(1, size);

	ce->ce_mode = create_ce_mode(mode);
	ce->ce_flags = create_ce_flags(stage);
	ce->ce_namelen = baselen + len;
	memcpy(ce->name, base, baselen);
	memcpy(ce->name + baselen, pathname, len+1);
	hashcpy(ce->sha1, sha1);
	return add_cache_entry(ce, opt);
}

static int read_one_entry(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, void *context)
{
	return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
				  ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
}

/*
 * This is used when the caller knows there is no existing entries at
 * the stage that will conflict with the entry being added.
 */
static int read_one_entry_quick(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, void *context)
{
	return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
				  ADD_CACHE_JUST_APPEND);
}

static int read_tree_1(struct tree *tree, struct strbuf *base,
		       int stage, struct pathspec *pathspec,
		       read_tree_fn_t fn, void *context)
{
	struct tree_desc desc;
	struct name_entry entry;
	unsigned char sha1[20];
	int len, oldlen = base->len;
	enum interesting retval = entry_not_interesting;

	if (parse_tree(tree))
		return -1;

	init_tree_desc(&desc, tree->buffer, tree->size);

	while (tree_entry(&desc, &entry)) {
		if (retval != all_entries_interesting) {
			retval = tree_entry_interesting(&entry, base, 0, pathspec);
			if (retval == all_entries_not_interesting)
				break;
			if (retval == entry_not_interesting)
				continue;
		}

		switch (fn(entry.sha1, base->buf, base->len,
			   entry.path, entry.mode, stage, context)) {
		case 0:
			continue;
		case READ_TREE_RECURSIVE:
			break;
		default:
			return -1;
		}

		if (S_ISDIR(entry.mode))
			hashcpy(sha1, entry.sha1);
		else if (S_ISGITLINK(entry.mode)) {
			struct commit *commit;

			commit = lookup_commit(entry.sha1);
			if (!commit)
				die("Commit %s in submodule path %s%s not found",
				    sha1_to_hex(entry.sha1),
				    base->buf, entry.path);

			if (parse_commit(commit))
				die("Invalid commit %s in submodule path %s%s",
				    sha1_to_hex(entry.sha1),
				    base->buf, entry.path);

			hashcpy(sha1, commit->tree->object.sha1);
		}
		else
			continue;

		len = tree_entry_len(&entry);
		strbuf_add(base, entry.path, len);
		strbuf_addch(base, '/');
		retval = read_tree_1(lookup_tree(sha1),
				     base, stage, pathspec,
				     fn, context);
		strbuf_setlen(base, oldlen);
		if (retval)
			return -1;
	}
	return 0;
}

int read_tree_recursive(struct tree *tree,
			const char *base, int baselen,
			int stage, struct pathspec *pathspec,
			read_tree_fn_t fn, void *context)
{
	struct strbuf sb = STRBUF_INIT;
	int ret;

	strbuf_add(&sb, base, baselen);
	ret = read_tree_1(tree, &sb, stage, pathspec, fn, context);
	strbuf_release(&sb);
	return ret;
}


struct read_tree_data {
	read_tree_fn_t fn;
	int stage;
};

int get_read_tree_fn(struct cache_entry *ce, void *cb_data)
{
	struct read_tree_data *data = cb_data;

	if (ce_stage(ce) == data->stage) {
		data->fn = read_one_entry;
		return 0;
	}
	return 1;
}

int read_tree(struct tree *tree, int stage, struct pathspec *match)
{
	read_tree_fn_t fn = NULL;
	int err;
	struct read_tree_data rtd;

	/*
	 * Currently the only existing callers of this function all
	 * call it with stage=1 and after making sure there is nothing
	 * at that stage; we could always use read_one_entry_quick().
	 *
	 * But when we decide to straighten out git-read-tree not to
	 * use unpack_trees() in some cases, this will probably start
	 * to matter.
	 */

	/*
	 * See if we have cache entry at the stage.  If so,
	 * do it the original slow way, otherwise, append and then
	 * sort at the end.
	 */
	rtd.fn = fn;
	rtd.stage = stage;
	for_each_cache_entry(get_read_tree_fn, &rtd);
	fn = rtd.fn;

	if (!fn)
		fn = read_one_entry_quick;
	err = read_tree_recursive(tree, "", 0, stage, match, fn, NULL);
	if (fn == read_one_entry || err)
		return err;

	sort_cache();
	return 0;
}

struct tree *lookup_tree(const unsigned char *sha1)
{
	struct object *obj = lookup_object(sha1);
	if (!obj)
		return create_object(sha1, OBJ_TREE, alloc_tree_node());
	if (!obj->type)
		obj->type = OBJ_TREE;
	if (obj->type != OBJ_TREE) {
		error("Object %s is a %s, not a tree",
		      sha1_to_hex(sha1), typename(obj->type));
		return NULL;
	}
	return (struct tree *) obj;
}

int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
{
	if (item->object.parsed)
		return 0;
	item->object.parsed = 1;
	item->buffer = buffer;
	item->size = size;

	return 0;
}

int parse_tree(struct tree *item)
{
	 enum object_type type;
	 void *buffer;
	 unsigned long size;

	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 (type != OBJ_TREE) {
		free(buffer);
		return error("Object %s not a tree",
			     sha1_to_hex(item->object.sha1));
	}
	return parse_tree_buffer(item, buffer, size);
}

struct tree *parse_tree_indirect(const unsigned char *sha1)
{
	struct object *obj = parse_object(sha1);
	do {
		if (!obj)
			return NULL;
		if (obj->type == OBJ_TREE)
			return (struct tree *) obj;
		else if (obj->type == OBJ_COMMIT)
			obj = &(((struct commit *) obj)->tree->object);
		else if (obj->type == OBJ_TAG)
			obj = ((struct tag *) obj)->tagged;
		else
			return NULL;
		if (!obj->parsed)
			parse_object(obj->sha1);
	} while (1);
}
debug log:

solving 5cd43f4 ...
found 5cd43f4 in https://public-inbox.org/git/1373184720-29767-9-git-send-email-t.gummerer@gmail.com/
found 62fed63 in git.git.git
preparing index
index prepared:
100644 62fed632d8a1ade389dd645b5887155c21ae25ba	tree.c

applying [1/1] https://public-inbox.org/git/1373184720-29767-9-git-send-email-t.gummerer@gmail.com/
diff --git a/tree.c b/tree.c
index 62fed63..5cd43f4 100644

Checking patch tree.c...
Applied patch tree.c cleanly.

index at:
100644 5cd43f4c9900ca7757322dbc1ebd91cf49430a94	tree.c

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