Reimplement read_tree_recursive() using tree_entry_interesting()

read_tree_recursive() uses a very similar function, match_tree_entry, to
tree_entry_interesting() to do its path matching. This patch kills
match_tree_entry() in favor of tree_entry_interesting().

match_tree_entry(), like older version of tree_entry_interesting(), does
not support wildcard matching. New read_tree_recursive() retains this
behavior by forcing all pathspecs literal.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

tree.c

@@ -45,51 +45,69 @@ static int read_one_entry_quick(const unsigned char *sha1, const char *base, int
 				  ADD_CACHE_JUST_APPEND);
 }
 
-static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, const char **paths)
+static int read_tree_1(struct tree *tree, struct strbuf *base,
+		       int stage, struct pathspec *pathspec,
+		       read_tree_fn_t fn, void *context)
 {
-	const char *match;
-	int pathlen;
+	struct tree_desc desc;
+	struct name_entry entry;
+	unsigned char sha1[20];
+	int len, retval = 0, oldlen = base->len;
 
-	if (!paths)
-		return 1;
-	pathlen = strlen(path);
-	while ((match = *paths++) != NULL) {
-		int matchlen = strlen(match);
+	if (parse_tree(tree))
+		return -1;
 
-		if (baselen >= matchlen) {
-			/* If it doesn't match, move along... */
-			if (strncmp(base, match, matchlen))
-				continue;
-			/* pathspecs match only at the directory boundaries */
-			if (!matchlen ||
-			    baselen == matchlen ||
-			    base[matchlen] == '/' ||
-			    match[matchlen - 1] == '/')
-				return 1;
-			continue;
-		}
+	init_tree_desc(&desc, tree->buffer, tree->size);
 
-		/* Does the base match? */
-		if (strncmp(base, match, baselen))
-			continue;
-
-		match += baselen;
-		matchlen -= baselen;
-
-		if (pathlen > matchlen)
-			continue;
-
-		if (matchlen > pathlen) {
-			if (match[pathlen] != '/')
-				continue;
-			if (!S_ISDIR(mode))
+	while (tree_entry(&desc, &entry)) {
+		if (retval != 2) {
+			retval = tree_entry_interesting(&entry, base, 0, pathspec);
+			if (retval < 0)
+				break;
+			if (retval == 0)
 				continue;
 		}
 
-		if (strncmp(path, match, pathlen))
+		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;
 
-		return 1;
+		len = tree_entry_len(entry.path, entry.sha1);
+		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;
 }
@@ -99,74 +117,18 @@ int read_tree_recursive(struct tree *tree,
 			int stage, const char **match,
 			read_tree_fn_t fn, void *context)
 {
-	struct tree_desc desc;
-	struct name_entry entry;
+	struct strbuf sb = STRBUF_INIT;
+	struct pathspec pathspec;
+	int i, ret;
 
-	if (parse_tree(tree))
-		return -1;
-
-	init_tree_desc(&desc, tree->buffer, tree->size);
-
-	while (tree_entry(&desc, &entry)) {
-		if (!match_tree_entry(base, baselen, entry.path, entry.mode, match))
-			continue;
-
-		switch (fn(entry.sha1, base, baselen, entry.path, entry.mode, stage, context)) {
-		case 0:
-			continue;
-		case READ_TREE_RECURSIVE:
-			break;
-		default:
-			return -1;
-		}
-		if (S_ISDIR(entry.mode)) {
-			int retval;
-			char *newbase;
-			unsigned int pathlen = tree_entry_len(entry.path, entry.sha1);
-
-			newbase = xmalloc(baselen + 1 + pathlen);
-			memcpy(newbase, base, baselen);
-			memcpy(newbase + baselen, entry.path, pathlen);
-			newbase[baselen + pathlen] = '/';
-			retval = read_tree_recursive(lookup_tree(entry.sha1),
-						     newbase,
-						     baselen + pathlen + 1,
-						     stage, match, fn, context);
-			free(newbase);
-			if (retval)
-				return -1;
-			continue;
-		} else if (S_ISGITLINK(entry.mode)) {
-			int retval;
-			struct strbuf path;
-			unsigned int entrylen;
-			struct commit *commit;
-
-			entrylen = tree_entry_len(entry.path, entry.sha1);
-			strbuf_init(&path, baselen + entrylen + 1);
-			strbuf_add(&path, base, baselen);
-			strbuf_add(&path, entry.path, entrylen);
-			strbuf_addch(&path, '/');
-
-			commit = lookup_commit(entry.sha1);
-			if (!commit)
-				die("Commit %s in submodule path %s not found",
-				    sha1_to_hex(entry.sha1), path.buf);
-
-			if (parse_commit(commit))
-				die("Invalid commit %s in submodule path %s",
-				    sha1_to_hex(entry.sha1), path.buf);
-
-			retval = read_tree_recursive(commit->tree,
-						     path.buf, path.len,
-						     stage, match, fn, context);
-			strbuf_release(&path);
-			if (retval)
-				return -1;
-			continue;
-		}
-	}
-	return 0;
+	init_pathspec(&pathspec, match);
+	for (i = 0; i < pathspec.nr; i++)
+		pathspec.items[i].has_wildcard = 0;
+	strbuf_add(&sb, base, baselen);
+	ret = read_tree_1(tree, &sb, stage, &pathspec, fn, context);
+	strbuf_release(&sb);
+	free_pathspec(&pathspec);
+	return ret;
 }
 
 static int cmp_cache_name_compare(const void *a_, const void *b_)