From eb85b2c11b64bb451090bdcc3d9c77c466255595 Mon Sep 17 00:00:00 2001
From: Scott Taylor <wonderboymusic@git.wordpress.org>
Date: Tue, 13 Oct 2015 14:13:12 +0000
Subject: [PATCH] Theme Editor: add a filter, `wp_theme_editor_filetypes`, to
 allow more filetypes to be edited via the Theme Editor. Usage of the Theme
 Editor is strenuously discouraged, but we should allow you to add whatever
 filetypes (`.less`, `.scss`) you would like.

Props MikeHansenMe, pross.
Fixes #22924.


git-svn-id: https://develop.svn.wordpress.org/trunk@35134 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-admin/theme-editor.php | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/src/wp-admin/theme-editor.php b/src/wp-admin/theme-editor.php
index 352deee2ca..ac77d57c8d 100644
--- a/src/wp-admin/theme-editor.php
+++ b/src/wp-admin/theme-editor.php
@@ -45,24 +45,35 @@ get_current_screen()->set_help_sidebar(
 
 wp_reset_vars( array( 'action', 'error', 'file', 'theme' ) );
 
-if ( $theme )
+if ( $theme ) {
 	$stylesheet = $theme;
-else
+} else {
 	$stylesheet = get_stylesheet();
+}
 
 $theme = wp_get_theme( $stylesheet );
 
-if ( ! $theme->exists() )
+if ( ! $theme->exists() ) {
 	wp_die( __( 'The requested theme does not exist.' ) );
+}
 
-if ( $theme->errors() && 'theme_no_stylesheet' == $theme->errors()->get_error_code() )
+if ( $theme->errors() && 'theme_no_stylesheet' == $theme->errors()->get_error_code() ) {
 	wp_die( __( 'The requested theme does not exist.' ) . ' ' . $theme->errors()->get_error_message() );
+}
 
 $allowed_files = $theme->get_files( 'php', 1 );
 $has_templates = ! empty( $allowed_files );
 $style_files = $theme->get_files( 'css' );
 $allowed_files['style.css'] = $style_files['style.css'];
-$allowed_files += $style_files;
+/**
+ * Filter the allowed files.
+ *
+ * @since 4.4.0
+ *
+ * @param array  $style_files List of style files.
+ * @param object $theme       The current Theme object.
+ */
+$allowed_files += apply_filters( 'wp_theme_editor_filetypes', $style_files, $theme );
 
 if ( empty( $file ) ) {
 	$relative_file = 'style.css';