repl: copying tabs shouldn't trigger completion

PR-URL: https://github.com/nodejs/node/pull/5958
Fixes: https://github.com/nodejs/node/issues/5954
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

doc/api/readline.md

@@ -357,10 +357,12 @@ a `'resize'` event on the `output` if/when the columns ever change
 
 Move cursor to the specified position in a given TTY stream.
 
-## readline.emitKeypressEvents(stream)
+## readline.emitKeypressEvents(stream[, interface])
 
 Causes `stream` to begin emitting `'keypress'` events corresponding to its
 input.
+Optionally, `interface` specifies a `readline.Interface` instance for which
+autocompletion is disabled when copy-pasted input is detected.
 
 Note that the stream, if it is a TTY, needs to be in raw mode:
 ```js

lib/readline.js

@@ -41,6 +41,7 @@ function Interface(input, output, completer, terminal) {
   }
 
   this._sawReturn = false;
+  this.isCompletionEnabled = true;
 
   EventEmitter.call(this);
   var historySize;
@@ -130,7 +131,7 @@ function Interface(input, output, completer, terminal) {
 
   } else {
 
-    emitKeypressEvents(input);
+    emitKeypressEvents(input, this);
 
     // input usually refers to stdin
     input.on('keypress', onkeypress);
@@ -883,7 +884,7 @@ Interface.prototype._ttyWrite = function(s, key) {
 
       case 'tab':
         // If tab completion enabled, do that...
-        if (typeof this.completer === 'function') {
+        if (typeof this.completer === 'function' && this.isCompletionEnabled) {
           this._tabComplete();
           break;
         }
@@ -917,7 +918,7 @@ exports.Interface = Interface;
 const KEYPRESS_DECODER = Symbol('keypress-decoder');
 const ESCAPE_DECODER = Symbol('escape-decoder');
 
-function emitKeypressEvents(stream) {
+function emitKeypressEvents(stream, iface) {
   if (stream[KEYPRESS_DECODER]) return;
   var StringDecoder = require('string_decoder').StringDecoder; // lazy load
   stream[KEYPRESS_DECODER] = new StringDecoder('utf8');
@@ -930,6 +931,10 @@ function emitKeypressEvents(stream) {
       var r = stream[KEYPRESS_DECODER].write(b);
       if (r) {
         for (var i = 0; i < r.length; i++) {
+          if (r[i] === '\t' && typeof r[i + 1] === 'string' && iface) {
+            iface.isCompletionEnabled = false;
+          }
+
           try {
             stream[ESCAPE_DECODER].next(r[i]);
           } catch (err) {
@@ -938,6 +943,10 @@ function emitKeypressEvents(stream) {
             stream[ESCAPE_DECODER] = emitKeys(stream);
             stream[ESCAPE_DECODER].next();
             throw err;
+          } finally {
+            if (iface) {
+              iface.isCompletionEnabled = true;
+            }
           }
         }
       }

test/parallel/test-readline-interface.js

@@ -227,7 +227,9 @@ function isWarned(emitter) {
     assert.strictEqual(called, false);
     called = true;
   });
-  fi.emit('data', '\tfo\to\t');
+  for (var character of '\tfo\to\t') {
+    fi.emit('data', character);
+  }
   fi.emit('data', '\n');
   assert.ok(called);
   rli.close();