add readline support for meta-d

lib/readline.js

@@ -377,6 +377,22 @@ Interface.prototype._ttyWrite = function (b) {
 	}
 	this.cursor = this.line.length;
 	this._refreshLine();
+      } else if (b[1] === 100 && this.cursor < this.line.length) { // meta-d delete forward word
+	next_word = this.line.slice(this.cursor, this.line.length)
+		      .search(/\w/);
+	if (next_word !== -1) {
+	  next_non_word = this.line.slice(this.cursor + next_word, this.line.length)
+			    .search(/\W/);
+	  if (next_non_word !== -1) {
+	    this.line = this.line.slice(this.cursor + next_word + next_non_word);
+	    this.cursor = 0;
+	    this._refreshLine();
+	    break;
+	  }
+	}
+	this.line = '';
+	this.cursor = 0;
+	this._refreshLine();
       } else if (b[1] === 91 && b[2] === 68) { // left arrow
         if (this.cursor > 0) {
           this.cursor--;

test/simple/test-readline.js

@@ -7,7 +7,8 @@ var key = {
     home: [27, 91, 72],
     end: [27, 91, 70],
     metab: [27, 98],
-    metaf: [27, 102]
+    metaf: [27, 102],
+    metad: [27, 100]
   },
   gnome: {
     home: [27, 79, 72],
@@ -88,4 +89,20 @@ written_bytes_length = rl.written_bytes.length;
 rl.write(key.xterm.metab);
 assert.equal(0, rl.cursor);
 refreshed = written_bytes_length !== rl.written_bytes.length;
-assert.equal(true,  refreshed);
+assert.equal(true,  refreshed);
+
+rl = readlineFakeStream();
+rl.write('foo bar.hop/zoo');
+rl.write(key.xterm.home);
+rl.write(key.xterm.metad);
+assert.equal(0, rl.cursor);
+assert.equal(' bar.hop/zoo', rl.line);
+rl.write(key.xterm.metad);
+assert.equal(0, rl.cursor);
+assert.equal('.hop/zoo', rl.line);
+rl.write(key.xterm.metad);
+assert.equal(0, rl.cursor);
+assert.equal('/zoo', rl.line);
+rl.write(key.xterm.metad);
+assert.equal(0, rl.cursor);
+assert.equal('', rl.line);