Expose the ability to find out if styles, scripts have already been queued. Fixes #6197 props jacobsantos

git-svn-id: http://svn.automattic.com/wordpress/trunk@10572 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.wp-scripts.php

@@ -16,7 +16,7 @@
  * register/enqueue new scripts.
  *
  * @since r16
- * @see WP_Scripts::print_scripts()
+ * @see WP_Dependencies::print_scripts()
  */
 function wp_print_scripts( $handles = false ) {
 	do_action( 'wp_print_scripts' );
@@ -38,7 +38,7 @@ function wp_print_scripts( $handles = false ) {
  * Register new JavaScript file.
  *
  * @since r16
- * @see WP_Scripts::add() For parameter information.
+ * @see WP_Dependencies::add() For parameter information.
  */
 function wp_register_script( $handle, $src, $deps = array(), $ver = false, $in_footer = false ) {
 	global $wp_scripts;
@@ -101,3 +101,28 @@ function wp_enqueue_script( $handle, $src = false, $deps = array(), $ver = false
 	}
 	$wp_scripts->enqueue( $handle );
 }
+
+/**
+ * Check whether script has been added to WordPress Scripts.
+ *
+ * The values for list defaults to 'queue', which is the same as enqueue for
+ * scripts.
+ *
+ * @since WP unknown; BP unknown
+ *
+ * @param string $handle Handle used to add script.
+ * @param string $list Optional, defaults to 'queue'. Others values are 'registered', 'queue', 'done', 'to_do'
+ * @return bool
+ */
+function wp_script_is( $handle, $list = 'queue' ) {
+	global $wp_scripts;
+	if ( !is_a($wp_scripts, 'WP_Scripts') )
+		$wp_scripts = new WP_Scripts();
+
+	$query = $wp_scripts->query( $handle, $list );
+
+	if ( is_object( $query ) )
+		return true;
+
+	return $query;
+}

wp-includes/functions.wp-styles.php

@@ -77,3 +77,28 @@ function wp_enqueue_style( $handle, $src = false, $deps = array(), $ver = false,
 	}
 	$wp_styles->enqueue( $handle );
 }
+
+/**
+ * Check whether style has been added to WordPress Styles.
+ *
+ * The values for list defaults to 'queue', which is the same as enqueue for
+ * styles.
+ *
+ * @since WP unknown; BP unknown
+ *
+ * @param string $handle Handle used to add style.
+ * @param string $list Optional, defaults to 'queue'. Others values are 'registered', 'queue', 'done', 'to_do'
+ * @return bool
+ */
+function wp_style_is( $handle, $list = 'queue' ) {
+	global $wp_styles;
+	if ( !is_a($wp_styles, 'WP_Scripts') )
+		$wp_styles = new WP_Styles();
+
+	$query = $wp_styles->query( $handle, $list );
+
+	if ( is_object( $query ) )
+		return true;
+
+	return $query;
+}