This is working pretty well:

--- a/better-code-editing.php
+++ b/better-code-editing.php
@@ -227,6 +227,8 @@ class Better_Code_Editing_Plugin {
 				'mode' => 'text/css',
 				'gutters' => array( 'CodeMirror-lint-markers' ),
 				'lint' => true,
+				'hint' => 'auto',
+				'extraKeys' => array( "Ctrl-Space" => "autocomplete" ),
 			) );
 		} elseif ( in_array( $extension, array( 'php', 'phtml', 'php3', 'php4', 'php5', 'php7', 'phps' ), true ) ) {
 			$settings['codemirror']['mode'] = 'application/x-httpd-php';
@@ -325,6 +327,9 @@ class Better_Code_Editing_Plugin {
 					if ( ! empty( $settings['codemirror']['lint'] ) ) {
 						wp_enqueue_script( 'codemirror-addon-lint-css' );
 					}
+					if ( ! empty( $settings['codemirror']['hint'] ) ) {
+						wp_enqueue_script( 'codemirror-addon-hint-css' );
+					}
 					break;
 			}
 
diff --git a/wp-admin/js/code-editor.js b/wp-admin/js/code-editor.js
index 7a229f2..621c20e 100644
--- a/wp-admin/js/code-editor.js
+++ b/wp-admin/js/code-editor.js
@@ -98,6 +98,13 @@ if ( 'undefined' === typeof window.wp.codeEditor ) {
 		// Keep track of the instances that have been created.
 		wp.codeEditor.instances.push( editor );
 
+		editor.on( 'keyup', function ( _editor, event ) {
+			var enterKey = 13;
+			if ( ! editor.state.completionActive && event.keyCode !== enterKey ) {
+				CodeMirror.commands.autocomplete( editor, null, { completeSingle: false } );
+			}
+		});
+
 		// Make sure the editor gets updated if the content was updated on the server (sanitization) but not updated in the editor since it was focused.
 		editor.on( 'blur', function() {
 			$textarea.data( 'next-tab-blurs', false );

Add autocomplete hinting #50

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