Fix a false-positive when unpiping in Node.js 0.8

HISTORY.md

@@ -1,3 +1,8 @@
+unreleased
+==========
+
+  * Fix a false-positive when unpiping in Node.js 0.8
+
 2.0.0 / 2015-05-08
 ==================
 

index.js

@@ -122,6 +122,23 @@ function halt(stream) {
   }
 }
 
+/**
+ * Determine if there are Node.js pipe-like data listeners.
+ */
+
+/* istanbul ignore next: implementation differs between versions */
+function hasPipeDataListeners(stream) {
+  var listeners = stream.listeners('data')
+
+  for (var i = 0; i < listeners.length; i++) {
+    if (listeners[i].name === 'ondata') {
+      return true
+    }
+  }
+
+  return false
+}
+
 /**
  * Make a serializable error object.
  *
@@ -307,6 +324,10 @@ function unpipe(stream) {
   }
 
   // Node.js 0.8 hack
+  if (!hasPipeDataListeners(stream)) {
+    return
+  }
+
   var listener
   var listeners = stream.listeners('close')