optimize alloc+clear. add a output dump option.

lib/program.js

@@ -39,6 +39,10 @@ function Program(options) {
   this.input = options.input || process.stdin;
   this.output = options.output || process.stdout;
 
+  if (options.dump) {
+    this.dump(options.dump);
+  }
+
   this.zero = options.zero !== false;
 
   this.x = 0;
@@ -77,6 +81,19 @@ function Program(options) {
 
 Program.prototype.__proto__ = EventEmitter.prototype;
 
+Program.prototype.dump =
+Program.prototype.log = function(file) {
+  var self = this
+    , _write = this.output.write;
+
+  this.logger = require('fs').createWriteStream(file);
+
+  this.output.write = function(data) {
+    self.logger.write(data);
+    return _write.apply(this, arguments);
+  };
+};
+
 Program.prototype.setupTput = function() {
   var self = this
     , options = this.options

lib/widget.js

@@ -279,8 +279,6 @@ function Screen(options) {
 
   this._ci = -1;
 
-  this.alloc();
-
   function resize() {
     self.alloc();
     self.render();
@@ -317,6 +315,7 @@ function Screen(options) {
 
   this.program.alternateBuffer();
   this.program.hideCursor();
+  this.alloc();
 
   function reset() {
     if (reset.done) return;
@@ -535,6 +534,7 @@ Screen.prototype.__defineGetter__('height', function() {
 });
 
 Screen.prototype.alloc = function() {
+  this.program.clear();
   var x, y;
   this.lines = [];
   for (y = 0; y < this.rows; y++) {
@@ -548,7 +548,7 @@ Screen.prototype.alloc = function() {
   for (y = 0; y < this.rows; y++) {
     this.olines[y] = [];
     for (x = 0; x < this.cols; x++) {
-      this.olines[y][x] = [];
+      this.olines[y][x] = [this.dattr, ' '];
     }
   }
 };