feat: add multiline editing

Signed-off-by: Snehil Shah <snehilshah.989@gmail.com>

Author: Snehil-Shah

lib/node_modules/@stdlib/repl/lib/completer_preview.js

@@ -246,7 +246,7 @@ setNonEnumerableReadOnly( PreviewCompleter.prototype, 'onKeypress', function onK
 * @type {Function}
 * @param {string} data - input data
 * @param {(Object|void)} key - key object
-* @returns {void}
+* @returns {boolean} boolean indicating whether the preview was auto-completed
 */
 setNonEnumerableReadOnly( PreviewCompleter.prototype, 'beforeKeypress', function beforeKeypress( data, key ) {
 	if ( !this._enabled ) {
@@ -273,7 +273,9 @@ setNonEnumerableReadOnly( PreviewCompleter.prototype, 'beforeKeypress', function
 		debug( 'Completion preview accepted. Performing auto-completion...' );
 		this._rli.write( this._preview );
 		this._preview = '';
+		return true;
 	}
+	return false;
 });
 
 

lib/node_modules/@stdlib/repl/lib/main.js

@@ -63,6 +63,7 @@ var inputPrompt = require( './input_prompt.js' );
 var OutputStream = require( './output_stream.js' );
 var processLine = require( './process_line.js' );
 var completerFactory = require( './completer.js' );
+var MultilineHandler = require( './multiline_handler.js' );
 var PreviewCompleter = require( './completer_preview.js' );
 var AutoCloser = require( './auto_close_pairs.js' );
 var SyntaxHighlighter = require( './syntax_highlighter.js' );
@@ -241,6 +242,9 @@ function REPL( options ) {
 	setNonEnumerable( this, '_multiline', {} );
 	setNonEnumerable( this._multiline, 'active', false );
 	setNonEnumerable( this._multiline, 'mode', 'incomplete_expression' );
+	setNonEnumerable( this._multiline, 'line', 0 );
+	setNonEnumerable( this._multiline, 'lines', [] );
+	setNonEnumerable( this._multiline, 'buffer', '' );
 
 	// Initialize an internal flag indicating whether the REPL has been closed:
 	setNonEnumerable( this, '_closed', false );
@@ -273,6 +277,9 @@ function REPL( options ) {
 		'completer': this._completer
 	}));
 
+	// Initialize a multiline handler:
+	setNonEnumerableReadOnly( this, '_multilineHandler', new MultilineHandler( this, this._rli._ttyWrite ) );
+
 	// Create a new auto-closer:
 	setNonEnumerableReadOnly( this, '_autoCloser', new AutoCloser( this._rli, this._settings.autoClosePairs, this._settings.autoDeletePairs ) );
 
@@ -337,12 +344,20 @@ function REPL( options ) {
 	* @param {(Object|void)} key - key object
 	*/
 	function beforeKeypress( data, key ) {
+		var completed;
+
 		if ( self._ostream.isPaging ) {
 			self._ostream.beforeKeypress( data, key );
 			return;
 		}
 		self._autoCloser.beforeKeypress( data, key );
-		self._previewCompleter.beforeKeypress( data, key );
+		completed = self._previewCompleter.beforeKeypress( data, key );
+
+		// If completion was auto-completed, don't trigger multiline keybindings to avoid double operations...
+		if ( !completed && self._multiline.active ) {
+			self._multilineHandler.beforeKeypress( data, key );
+			return;
+		}
 		self._ttyWrite.call( self._rli, data, key );
 	}
 
@@ -366,6 +381,7 @@ function REPL( options ) {
 		if ( autoClosed ) {
 			self._previewCompleter.clear();
 		}
+		self._multilineHandler.onKeypress( data, key );
 		self._syntaxHighlighter.onKeypress();
 		self._previewCompleter.onKeypress( data, key );
 	}
@@ -508,6 +524,19 @@ setNonEnumerableReadOnly( REPL.prototype, '_prompt', function prompt() {
 	return inputPrompt( this._inputPrompt, this._count );
 });
 
+/**
+* Returns the height of the current input.
+*
+* @private
+* @name _inputHeight
+* @memberof REPL.prototype
+* @type {Function}
+* @returns {number} input rows
+*/
+setNonEnumerableReadOnly( REPL.prototype, '_inputHeight', function inputHeight() {
+	return this._multiline.lines.length;
+});
+
 /**
 * Returns the REPL viewport.
 *