No updates when the list of tickers is empty

line_editor.go

@@ -166,6 +166,9 @@ func (self *LineEditor) execute() *LineEditor {
 				for i := before; i > after; i-- {
 					self.screen.ClearLine(0, i + 4)
 				}
+				if after == 0 {	// Hide quotes header is the are no tickers left.
+					self.screen.ClearLine(0, 4)
+				}
 			}
 		}
 	}

screen.go

@@ -49,7 +49,7 @@ func (self *Screen) Close() *Screen {
 }
 
 //-----------------------------------------------------------------------------
-func (self *Screen) Draw(objects ...interface{}) {
+func (self *Screen) Draw(objects ...interface{}) *Screen {
 	for _, ptr := range objects {
 		switch ptr.(type) {
 		case *Market:
@@ -57,11 +57,15 @@ func (self *Screen) Draw(objects ...interface{}) {
 			self.draw(object.Fetch().Format())
 		case *Quotes:
 			object := ptr.(*Quotes)
-			self.draw(object.Fetch().Format())
+			if object.Ready() {
+				self.draw(object.Fetch().Format())
+			}
 		default:
 			self.draw(ptr.(string))
 		}
 	}
+
+	return self
 }
 
 //-----------------------------------------------------------------------------

yahoo_quotes.go

@@ -70,9 +70,10 @@ func (self *Quotes) Initialize(market *Market, profile *Profile) *Quotes {
 	return self
 }
 
-//-----------------------------------------------------------------------------
+// Fetch the latest stock quotes and parse raw fetched data into array of
+// []Stock structs.
 func (self *Quotes) Fetch() *Quotes {
-	if !self.market.IsClosed || self.stocks == nil {
+	if self.Ready() {
 		// Format the URL and send the request.
 		url := fmt.Sprintf(yahoo_quotes_url, self.profile.ListOfTickers())
 		response, err := http.Get(url)
@@ -93,6 +94,14 @@ func (self *Quotes) Fetch() *Quotes {
 	return self
 }
 
+// Return true if we haven't fetched the quotes yet *or* the stock market is
+// still open and we might want to grab the latest quotes. In both cases we
+// make sure the list of requested tickers is not empty.
+func (self *Quotes) Ready() bool {
+	return (self.stocks == nil || !self.market.IsClosed) && len(self.profile.Tickers) > 0
+}
+
+
 //-----------------------------------------------------------------------------
 func (self *Quotes) Format() string {
 	return new(Layout).Initialize().Quotes(self)