lazily set raw mode.

lib/program.js

@@ -44,43 +44,42 @@ Program.prototype.term = function(is) {
 };
 
 Program.prototype.listen = function() {
-  if (!this.input.isTTY || !this.output.isTTY) {
-    return;
-  }
-
   var readline = require('readline')
     , self = this;
 
-  if (!this.input.isRaw) {
-    this.input.setRawMode(true);
-
-    this.input.on('keypress', function(ch, key) {
-      key = key || 0;
-      if (key.ctrl && key.name === 'c') {
-        if (process.listeners('SIGINT').length) {
-          process.emit('SIGINT');
-        }
-        if (self.listeners('SIGINT').length) {
-          self.emit('SIGINT');
-        }
-        return;
-      }
-      self.emit('keypress', ch, key);
-    });
-
-    this.input.on('data', function(data) {
-      self.emit('data', data);
-    });
-
-    readline.emitKeypressEvents(this.input);
-
-    this.input.resume();
+  if (!this.input.isTTY || !this.output.isTTY) {
+    throw new Error('Not a terminal.');
   }
 
-  this.output.on('resize', function() {
-    self.cols = self.output.columns;
-    self.rows = self.output.rows;
-    self.emit('resize');
+  // Input
+  this.input.on('keypress', function(ch, key) {
+    key = key || 0;
+    if (key.ctrl && key.name === 'c') {
+      if (process.listeners('SIGINT').length) {
+        process.emit('SIGINT');
+      }
+      if (self.listeners('SIGINT').length) {
+        self.emit('SIGINT');
+      }
+      return;
+    }
+    self.emit('keypress', ch, key);
+  });
+
+  this.input.on('data', function(data) {
+    self.emit('data', data);
+  });
+
+  readline.emitKeypressEvents(this.input);
+
+  this.on('newListener', function fn(type) {
+    if (type === 'keypress' || type === 'mouse') {
+      self.removeListener('newListener', fn);
+      if (!self.input.isRaw) {
+        self.input.setRawMode(true);
+        self.input.resume();
+      }
+    }
   });
 
   this.on('newListener', function fn(type) {
@@ -92,6 +91,13 @@ Program.prototype.listen = function() {
 
   // self.bindMouse();
   // self.bindResponse();
+
+  // Output
+  this.output.on('resize', function() {
+    self.cols = self.output.columns;
+    self.rows = self.output.rows;
+    self.emit('resize');
+  });
 };
 
 // XTerm mouse events