finish implementing utility function for getting the current localized time as well as allowing the format and language to be overridden in the config file.

data/lightdm-webkit2-greeter.conf

@@ -3,13 +3,19 @@
 # debug_mode          = Greeter theme debug mode.
 # secure_mode         = Don't allow themes to make remote http requests.
 # screensaver_timeout = Blank the screen after this many seconds of inactivity.
+# time_format         = A moment.js format string for use by theme's to display the time.
+# time_language       = Language to use when displaying the time or "auto" to use the system's language.
 # webkit_theme        = Webkit theme to use.
 #
+# NOTE: See moment.js documentation for format string options: http://momentjs.com/docs/#/displaying/format/
+#
 
 [greeter]
 debug_mode          = false
 secure_mode         = true
 screensaver_timeout = 300
+time_format         = LT
+time_language       = auto
 webkit_theme        = antergos
 
 #

src/gresource/js/GreeterConfig.js

@@ -26,6 +26,10 @@
  */
 
 
+let _branding = null,
+	_greeter = null;
+
+
 /**
  * Provides theme authors with a way to retrieve values from the greeter's config
  * file located at `/etc/lightdm/lightdm-webkit2-greeter.conf`. The greeter will
@@ -45,7 +49,15 @@ class GreeterConfig  {
 	 *
 	 * @readonly
 	 */
-	get branding() {}
+	get branding() {
+		let props = ['background_images', 'logo', 'user_image'];
+
+		if ( null === _branding ) {
+			props.forEach( prop => _branding[prop] = this.get_str( 'branding', prop ) );
+		}
+
+		return _branding;
+	}
 
 	/**
 	 * Holds keys/values from the `greeter` section of the config file.
@@ -54,11 +66,26 @@ class GreeterConfig  {
 	 *       {Boolean} greeter.debug_mode
 	 *       {Boolean} greeter.secure_mode
 	 *       {Number}  greeter.screensaver_timeout
+	 *       {String}  greeter.time_format
+	 *       {String}  greeter.time_language
 	 *       {String}  greeter.webkit_theme
 	 *
 	 * @readonly
 	 */
-	get greeter() {}
+	get greeter() {
+		let bools = ['debug_mode', 'secure_mode'],
+			strings = ['time_format', 'time_language', 'webkit_theme'];
+
+		if ( null === _greeter ) {
+			_greeter = {};
+			_greeter.screensaver_timeout = this.get_num( 'greeter', 'screensaver_timeout' );
+
+			bools.forEach( prop => _greeter[prop] = this.get_bool( 'greeter', prop ) );
+			strings.forEach( prop => _greeter[prop] = this.get_str( 'greeter', prop ) );
+		}
+
+		return _greeter;
+	}
 
 	/**
 	 * Returns the value of `key` from the `config_section` of the greeter's config file.
@@ -70,7 +97,9 @@ class GreeterConfig  {
 	 *
 	 * @returns {Boolean} Config value for `key`.
 	 */
-	get_bool( config_section, key ) {}
+	get_bool( config_section, key ) {
+		return __GreeterConfig.get_bool( config_section, key );
+	}
 
 	/**
 	 * Returns the value of `key` from the `config_section` of the greeter's config file.
@@ -82,7 +111,9 @@ class GreeterConfig  {
 	 *
 	 * @returns {Number} Config value for `key`.
 	 */
-	get_num( config_section, key ) {}
+	get_num( config_section, key ) {
+		return __GreeterConfig.get_num( config_section, key );
+	}
 
 	/**
 	 * Returns the value of `key` from the `config_section` of the greeter's config file.
@@ -94,7 +125,9 @@ class GreeterConfig  {
 	 *
 	 * @returns {String} Config value for `key`.
 	 */
-	get_str( key ) {}
+	get_str( config_section, key ) {
+		return __GreeterConfig.get_str( config_section, key );
+	}
 }
 
 
@@ -102,8 +135,11 @@ class GreeterConfig  {
  * @memberOf window
  * @type {LightDM.GreeterConfig}
  */
-window.greeter_config = __GreeterConfig;
+window.greeter_config = new GreeterConfig();
+
 
-/* -------->>> DEPRECATED! <<<-------- */
+/**
+ * @deprecated
+ * @type {LightDM.GreeterConfig}
+ */
 window.config = window.greeter_config;
-/* -------->>> DEPRECATED! <<<-------- */

src/gresource/js/ThemeUtils.js

@@ -30,7 +30,10 @@ if ( 'undefined' === typeof window.navigator.languages ) {
 }
 
 moment.locale( window.navigator.languages );
-let localized_invalid_date = moment('today', '!@#');
+
+let localized_invalid_date = moment('today', '!@#'),
+	time_language = null,
+	time_format = null;
 
 
 
@@ -45,9 +48,9 @@ class ThemeUtils  {
 	/**
 	 * Binds `this` to class, `context`, for all of the class's methods.
 	 *
-	 * @arg {function(new:*): Object} context An ES6 class (not an instance) with at least one method.
+	 * @arg {Object} context An ES6 class instance with at least one method.
 	 *
-	 * @return {function(new:*): Object} `context` with `this` bound to it for all of its methods.
+	 * @return {Object} `context` with `this` bound to it for all of its methods.
 	 */
 	bind_this( context ) {
 		let excluded_methods = ['constructor'];
@@ -98,8 +101,10 @@ class ThemeUtils  {
 
 
 	/**
-	 * Get the current time in a localized format based on the `time_format` config file key.
+	 * Get the current time in a localized format. Time format and language are auto-detected
-	 *   * When `time_format` has a valid value, time will be formatted
+	 * by default, but can be set manually in the greeter config file.
+	 *   * `language` defaults to the system's language, but can be set manually in the config file.
+	 *   * When `time_format` config file option has a valid value, time will be formatted
 	 *     according to that value.
 	 *   * When `time_format` does not have a valid value, the time format will be `LT`
 	 *     which is `1:00 PM` or `13:00` depending on the system's locale.
@@ -107,8 +112,19 @@ class ThemeUtils  {
 	 * @return {String} The current localized time.
 	 */
 	get_current_localized_time() {
-		let config_format = greeter_config.greeter.time_format;
+		if ( null === time_language ) {
-		let format = ( '' !== config_format ) ? config_format : 'LT';
+			let config = greeter_config.greeter,
+				manual_language = ( '' !== config.time_language && 'auto' !== config.time_language ),
+				manual_time_format = ( '' !== config.time_format && 'auto' !== config.time_format );
+
+			time_language =  manual_language ? config.time_language : window.navigator.language;
+			time_format = manual_time_format ? config.time_format : 'LT';
+
+			if ( manual_language ) {
+				moment.locale( time_language );
+			}
+		}
+
 		let local_time = moment().format( format );
 
 		if ( local_time === localized_invalid_date ) {