Add more sort options to package API, correct documentation

Fixes #204

app/flatpages/help/api.md

@@ -60,9 +60,29 @@ Example:
 Supported query parameters:
 
 * `type` - Package types (`mod`, `game`, `txp`).
-* `q` - Query string
+* `q` - Query string.
+* `author` - Filter by author.
+* `tag` - Filter by tags.
 * `random` - When present, enable random ordering and ignore `sort`.
+* `limit` - Return at most `limit` packages.
 * `hide` - Hide content based on [Content Flags](/help/content_flags/).
-* `sort` - Sort by (`name`, `views`, `date`, `score`).
-* `order` - Sort ascending (`Asc`) or descending (`desc`).
+* `sort` - Sort by (`name`, `title`, `score`, `downloads`, `created_at`).
+* `order` - Sort ascending (`asc`) or descending (`desc`).
 * `protocol_version` - Only show packages supported by this Minetest protocol version.
+* `engine_version` - Only show packages supported by this Minetest engine version, eg: `5.3.0`.
+
+
+## Topic Queries
+
+Example:
+
+	/api/topics/?q=mobs
+
+Supported query parameters:
+
+* `q` - Query string.
+* `sort` - Sort by (`name`, `views`, `date`).
+* `order` - Sort ascending (`asc`) or descending (`desc`).
+* `show_added` - Show topics that have an existing package.
+* `show_discarded` - Show topics marked as discarded.
+* `limit` - Return at most `limit` topics.

app/querybuilder.py

@@ -79,7 +79,13 @@ class QueryBuilder:
 			to_order = None
 			if self.order_by is None or self.order_by == "score":
 				to_order = Package.score
-			elif self.order_by == "created_at":
+			elif self.order_by == "name":
+				to_order = Package.name
+			elif self.order_by == "title":
+				to_order = Package.title
+			elif self.order_by == "downloads":
+				to_order = Package.downloads
+			elif self.order_by == "created_at" or self.order_by == "date":
 				to_order = Package.created_at
 			else:
 				abort(400)
@@ -134,7 +140,7 @@ class QueryBuilder:
 			query = query.order_by(db.asc(ForumTopic.wip), db.asc(ForumTopic.name), db.asc(ForumTopic.title))
 		elif self.order_by == "views":
 			query = query.order_by(db.desc(ForumTopic.views))
-		elif self.order_by == "date":
+		elif self.order_by == "created_at" or self.order_by == "date":
 			query = query.order_by(db.asc(ForumTopic.created_at))
 
 		if self.search: