Add initial support for the XDG Base Directory spec

Spec version 0.7 from https://standards.freedesktop.org/basedir-spec/basedir-spec-0.7.html
(latest as of this commit).

Three virtual methods are added to OS for the various XDG paths we will use:
- OS::get_data_path gives XDG_DATA_HOME, or if missing:
  ~/.local/share on X11, ~/Library/Application Support/ on macOS and %APPDATA% on Windows
- OS::get_config_path gives XDG_CONFIG_HOME, or if missing:
  ~/.config on X11, ~/Library/Application Support/ on macOS and %APPDATA% on Windows
- OS::get_cache_path gives XDG_CACHE_HOME, or if missing:
  ~/.cache on X11, ~/Library/Caches on macOS and %APPDATA% on Windows

So for Windows there are no changes, for Linux we follow the full split spec
and for macOS stuff will move from ~/.godot to ~/Library/Application Support/Godot.

Support for system-wide installation of templates on Unix was removed for now,
as it's a bit hackish and I don't think anyone uses it.

user:// will still be OS::get_data_path() + "/godot/app_userdata/$name" by
default, but when using the application/config/use_shared_user_dir option
it will now use XDG_DATA_HOME/$name, e.g. ~/.local/share/MyGame.

For now everything still goes in EditorSettings::get_settings_dir(), but
this will be changed in a later commit to make use of the new splitting
where relevant.

Part of #3513.

1 files changed, 6 insertions, 21 deletions

diff --git a/editor/editor_export.cpp b/editor/editor_export.cpp
index 3d0b09c72..6b9458081 100644
--- a/editor/editor_export.cpp
+++ b/editor/editor_export.cpp
@@ -336,33 +336,18 @@ Error EditorExportPlatform::_save_zip_file(void *p_userdata, const String &p_pat
 
 String EditorExportPlatform::find_export_template(String template_file_name, String *err) const {
 
-	String base_name = itos(VERSION_MAJOR) + "." + itos(VERSION_MINOR) + "-" + _MKSTR(VERSION_STATUS) + "/" + template_file_name;
-	String user_file = EditorSettings::get_singleton()->get_settings_dir() + "/templates/" + base_name;
-	String system_file = OS::get_singleton()->get_installed_templates_path();
-	bool has_system_path = (system_file != "");
-	system_file = system_file.plus_file(base_name);
+	String current_version = itos(VERSION_MAJOR) + "." + itos(VERSION_MINOR) + "-" + _MKSTR(VERSION_STATUS) + VERSION_MODULE_CONFIG;
+	String template_path = EditorSettings::get_singleton()->get_templates_dir().plus_file(current_version).plus_file(template_file_name);
 
-	// Prefer user file
-	if (FileAccess::exists(user_file)) {
-		return user_file;
-	}
-
-	// Now check system file
-	if (has_system_path) {
-		if (FileAccess::exists(system_file)) {
-			return system_file;
-		}
+	if (FileAccess::exists(template_path)) {
+		return template_path;
 	}
 
 	// Not found
 	if (err) {
-		*err += "No export template found at \"" + user_file + "\"";
-		if (has_system_path)
-			*err += "\n or \"" + system_file + "\".";
-		else
-			*err += ".";
+		*err += "No export template found at \"" + template_path + "\".";
 	}
-	return String(); // not found
+	return String();
 }
 
 bool EditorExportPlatform::exists_export_template(String template_file_name, String *err) const {