Load media from subfolders (#9065)

doc/lua_api.txt

@@ -152,7 +152,11 @@ Mod directory structure
     │   ├── models
     │   ├── textures
     │   │   ├── modname_stuff.png
-    │   │   └── modname_something_else.png
+    │   │   ├── modname_something_else.png
+    │   │   ├── subfolder_foo
+    │   │   │   ├── modname_more_stuff.png
+    │   │   │   └── another_subfolder
+    │   │   └── bar_subfolder
     │   ├── sounds
     │   ├── media
     │   ├── locale
@@ -221,18 +225,20 @@ registered callbacks.
 `minetest.settings` can be used to read custom or existing settings at load
 time, if necessary. (See [`Settings`])
 
-### `models`
-
-Models for entities or meshnodes.
-
-### `textures`, `sounds`, `media`
+### `textures`, `sounds`, `media`, `models`, `locale`
 
 Media files (textures, sounds, whatever) that will be transferred to the
-client and will be available for use by the mod.
+client and will be available for use by the mod and translation files for
+the clients (see [Translations]).
 
-### `locale`
+It is suggested to use the folders for the purpous they are thought for,
+eg. put textures into `textures`, translation files into `locale`,
+models for entities or meshnodes into `models` et cetera.
 
-Translation files for the clients. (See [Translations])
+These folders and subfolders can contain subfolders.
+Subfolders with names starting with `_` or `.` are ignored.
+If a subfolder contains a media file with the same name as a media file
+in one of its parents, the parent's file is used.
 
 Naming conventions
 ------------------

games/devtest/mods/basenodes/textures/dirt_with_grass/info.txt

@@ -0,0 +1,3 @@
+This is for testing loading textures from subfolders.
+If it works correctly, the default_grass_side.png file in this folder is used but
+default_grass.png is not overwritten by the file in this folder.

src/server.cpp

@@ -2494,19 +2494,25 @@ void Server::fillMediaCache()
 
 	// Collect all media file paths
 	std::vector<std::string> paths;
-	m_modmgr->getModsMediaPaths(paths);
-	fs::GetRecursiveDirs(paths, m_gamespec.path + DIR_DELIM + "textures");
+	// The paths are ordered in descending priority
 	fs::GetRecursiveDirs(paths, porting::path_user + DIR_DELIM + "textures" + DIR_DELIM + "server");
+	fs::GetRecursiveDirs(paths, m_gamespec.path + DIR_DELIM + "textures");
+	m_modmgr->getModsMediaPaths(paths);
 
 	// Collect media file information from paths into cache
 	for (const std::string &mediapath : paths) {
 		std::vector<fs::DirListNode> dirlist = fs::GetDirListing(mediapath);
 		for (const fs::DirListNode &dln : dirlist) {
-			if (dln.dir) // Ignore dirs
+			if (dln.dir) // Ignore dirs (already in paths)
 				continue;
+
+			const std::string &filename = dln.name;
+			if (m_media.find(filename) != m_media.end()) // Do not override
+				continue;
+
 			std::string filepath = mediapath;
-			filepath.append(DIR_DELIM).append(dln.name);
-			addMediaFile(dln.name, filepath);
+			filepath.append(DIR_DELIM).append(filename);
+			addMediaFile(filename, filepath);
 		}
 	}
 

src/server/mods.cpp

@@ -99,10 +99,10 @@ void ServerModManager::getModNames(std::vector<std::string> &modlist) const
 void ServerModManager::getModsMediaPaths(std::vector<std::string> &paths) const
 {
 	for (const ModSpec &spec : m_sorted_mods) {
-		paths.push_back(spec.path + DIR_DELIM + "textures");
-		paths.push_back(spec.path + DIR_DELIM + "sounds");
-		paths.push_back(spec.path + DIR_DELIM + "media");
-		paths.push_back(spec.path + DIR_DELIM + "models");
-		paths.push_back(spec.path + DIR_DELIM + "locale");
+		fs::GetRecursiveDirs(paths, spec.path + DIR_DELIM + "textures");
+		fs::GetRecursiveDirs(paths, spec.path + DIR_DELIM + "sounds");
+		fs::GetRecursiveDirs(paths, spec.path + DIR_DELIM + "media");
+		fs::GetRecursiveDirs(paths, spec.path + DIR_DELIM + "models");
+		fs::GetRecursiveDirs(paths, spec.path + DIR_DELIM + "locale");
 	}
 }

src/unittest/test_servermodmanager.cpp

@@ -169,6 +169,4 @@ void TestServerModManager::testGetModMediaPaths()
 	std::vector<std::string> result;
 	sm.getModsMediaPaths(result);
 	UASSERTEQ(bool, result.empty(), false);
-	// We should have 5 folders for each mod (textures, media, locale, model, sounds)
-	UASSERTEQ(unsigned long, result.size() % 5, 0);
 }