Ticket #29892: 29892.2.patch

src/wp-includes/l10n.php

@@ -744 +744 @@
 }
 
 /**
- * Get all available languages based on the presence of *.mo files in a given directory.
+ * Get all available core languages based on the presence of *.mo/*.po files in
+ * a given directory.
  *
  * The default directory is WP_LANG_DIR.
  *
  * @since 3.0.0
  *
+ * @see wp_get_installed_translations()
+ *
  * @param string $dir A directory to search for language files.
  *                    Default WP_LANG_DIR.
- * @return array An array of language codes or an empty array if no languages are present. Language codes are formed by stripping the .mo extension from the language file names.
+ * @return array An array of language codes or an empty array if no languages are present.
+ *               Language codes are formed by stripping the extension from the language file names.
  */
 function get_available_languages( $dir = null ) {
-        $languages = array();
+        $translations = wp_get_installed_translations( 'core', $dir );
 
-        foreach( (array)glob( ( is_null( $dir) ? WP_LANG_DIR : $dir ) . '/*.mo' ) as $lang_file ) {
-                $lang_file = basename($lang_file, '.mo');
-                if ( 0 !== strpos( $lang_file, 'continents-cities' ) && 0 !== strpos( $lang_file, 'ms-' ) &&
-                        0 !== strpos( $lang_file, 'admin-' ))
-                        $languages[] = $lang_file;
+        if ( empty( $translations['default'] ) ) {
+                return array();
         }
 
-        return $languages;
+        return array_keys( $translations['default'] );
 }
 
 /**
@@ -775 +776 @@
  *
  * @since 3.7.0
  *
- * @param string $type What to search for. Accepts 'plugins', 'themes', 'core'.
+ * @param string $type     What to search for. Accepts 'plugins', 'themes', 'core'.
+ * @param string $lang_dir A directory to search for language files. Default WP_LANG_DIR.
  * @return array Array of language data.
  */
-function wp_get_installed_translations( $type ) {
+function wp_get_installed_translations( $type, $lang_dir = null ) {
         if ( $type !== 'themes' && $type !== 'plugins' && $type !== 'core' )
                 return array();
 
+        $lang_dir = is_null( $lang_dir ) ? WP_LANG_DIR : $lang_dir;
         $dir = 'core' === $type ? '' : "/$type";
 
-        if ( ! is_dir( WP_LANG_DIR ) )
+        if ( ! is_dir( $lang_dir ) ) {
                 return array();
+        }
 
-        if ( $dir && ! is_dir( WP_LANG_DIR . $dir ) )
+        if ( $dir && ! is_dir( $lang_dir . $dir ) ) {
                 return array();
+        }
 
-        $files = scandir( WP_LANG_DIR . $dir );
-        if ( ! $files )
+        $files = scandir( $lang_dir . $dir );
+        if ( ! $files ) {
                 return array();
+        }
 
         $language_data = array();
 
@@ -814 +820 @@
                 if ( '' === $textdomain ) {
                         $textdomain = 'default';
                 }
-                $language_data[ $textdomain ][ $language ] = wp_get_pomo_file_data( WP_LANG_DIR . "$dir/$file" );
+
+                if ( 'core' === $type && ! in_array( $textdomain, array( 'default', 'admin', 'admin-network', 'continents-cities' ) ) ) {
+                        continue;
+                }
+
+                $language_data[ $textdomain ][ $language ] = wp_get_pomo_file_data( $lang_dir . "$dir/$file" );
         }
         return $language_data;
 }