Return error on update callback

cointop/chart.go

@@ -91,13 +91,14 @@ func (ct *Cointop) UpdateChart() error {
 		}
 	}
 
-	ct.Update(func() {
+	ct.Update(func() error {
 		if ct.Views.Chart.Backing() == nil {
-			return
+			return nil
 		}
 
 		ct.Views.Chart.Backing().Clear()
 		fmt.Fprint(ct.Views.Chart.Backing(), ct.colorscheme.Chart(body))
+		return nil
 	})
 
 	return nil
@@ -424,14 +425,15 @@ func (ct *Cointop) ToggleCoinChart() error {
 // ShowChartLoader shows chart loading indicator
 func (ct *Cointop) ShowChartLoader() error {
 	ct.debuglog("ShowChartLoader()")
-	ct.Update(func() {
+	ct.Update(func() error {
 		if ct.Views.Chart.Backing() == nil {
-			return
+			return nil
 		}
 
 		content := "\n\nLoading..."
 		ct.Views.Chart.Backing().Clear()
 		fmt.Fprint(ct.Views.Chart.Backing(), ct.colorscheme.Chart(content))
+		return nil
 	})
 
 	return nil

cointop/conversion.go

@@ -174,14 +174,15 @@ func (ct *Cointop) updateConvertMenu() {
 	}
 
 	content := fmt.Sprintf("%s%s%s", header, helpline, body)
-	ct.Update(func() {
+	ct.Update(func() error {
 		if ct.Views.ConvertMenu.Backing() == nil {
-			return
+			return nil
 		}
 
 		ct.Views.ConvertMenu.Backing().Clear()
 		ct.Views.ConvertMenu.Backing().Frame = true
 		fmt.Fprintln(ct.Views.ConvertMenu.Backing(), content)
+		return nil
 	})
 }
 
@@ -230,14 +231,15 @@ func (ct *Cointop) hideConvertMenu() error {
 	ct.State.convertMenuVisible = false
 	ct.SetViewOnBottom(ct.Views.ConvertMenu.Name())
 	ct.SetActiveView(ct.Views.Table.Name())
-	ct.Update(func() {
+	ct.Update(func() error {
 		if ct.Views.ConvertMenu.Backing() == nil {
-			return
+			return nil
 		}
 
 		ct.Views.ConvertMenu.Backing().Clear()
 		ct.Views.ConvertMenu.Backing().Frame = false
 		fmt.Fprintln(ct.Views.ConvertMenu.Backing(), "")
+		return nil
 	})
 	return nil
 }

cointop/help.go

@@ -58,14 +58,15 @@ func (ct *Cointop) updateHelp() {
 	versionline := pad.Left(fmt.Sprintf("v%s", ct.Version()), ct.maxTableWidth-5, " ")
 	content := header + infoline + body + versionline
 
-	ct.Update(func() {
+	ct.Update(func() error {
 		if ct.Views.Help.Backing() == nil {
-			return
+			return nil
 		}
 
 		ct.Views.Help.Backing().Clear()
 		ct.Views.Help.Backing().Frame = true
 		fmt.Fprintln(ct.Views.Help.Backing(), content)
+		return nil
 	})
 }
 
@@ -82,14 +83,15 @@ func (ct *Cointop) hideHelp() error {
 	ct.State.helpVisible = false
 	ct.SetViewOnBottom(ct.Views.Help.Name())
 	ct.SetActiveView(ct.Views.Table.Name())
-	ct.Update(func() {
+	ct.Update(func() error {
 		if ct.Views.Help.Backing() == nil {
-			return
+			return nil
 		}
 
 		ct.Views.Help.Backing().Clear()
 		ct.Views.Help.Backing().Frame = false
 		fmt.Fprintln(ct.Views.Help.Backing(), "")
+		return nil
 	})
 	return nil
 }

cointop/marketbar.go

@@ -143,13 +143,14 @@ func (ct *Cointop) updateMarketbar() error {
 	content = pad.Right(content, maxX, " ")
 	content = ct.colorscheme.Marketbar(content)
 
-	ct.Update(func() {
+	ct.Update(func() error {
 		if ct.Views.Marketbar.Backing() == nil {
-			return
+			return nil
 		}
 
 		ct.Views.Marketbar.Backing().Clear()
 		fmt.Fprintln(ct.Views.Marketbar.Backing(), content)
+		return nil
 	})
 
 	return nil

cointop/portfolio.go

@@ -81,12 +81,13 @@ func (ct *Cointop) updatePortfolioUpdateMenu() {
 	label := fmt.Sprintf(" Enter holdings for %s %s", ct.colorscheme.MenuLabel(coin.Name), current)
 	content := fmt.Sprintf("%s\n%s\n\n%s%s\n\n\n [Enter] %s    [ESC] Cancel", header, label, strings.Repeat(" ", 29), coin.Symbol, submitText)
 
-	ct.Update(func() {
+	ct.Update(func() error {
 		ct.Views.PortfolioUpdateMenu.Backing().Clear()
 		ct.Views.PortfolioUpdateMenu.Backing().Frame = true
 		fmt.Fprintln(ct.Views.PortfolioUpdateMenu.Backing(), content)
 		fmt.Fprintln(ct.Views.Input.Backing(), value)
 		ct.Views.Input.Backing().SetCursor(len(value), 0)
+		return nil
 	})
 }
 
@@ -111,9 +112,9 @@ func (ct *Cointop) hidePortfolioUpdateMenu() error {
 	ct.SetViewOnBottom(ct.Views.PortfolioUpdateMenu.Name())
 	ct.SetViewOnBottom(ct.Views.Input.Name())
 	ct.SetActiveView(ct.Views.Table.Name())
-	ct.Update(func() {
+	ct.Update(func() error {
 		if ct.Views.PortfolioUpdateMenu.Backing() == nil {
-			return
+			return nil
 		}
 
 		ct.Views.PortfolioUpdateMenu.Backing().Clear()
@@ -122,7 +123,9 @@ func (ct *Cointop) hidePortfolioUpdateMenu() error {
 
 		ct.Views.Input.Backing().Clear()
 		fmt.Fprintln(ct.Views.Input.Backing(), "")
+		return nil
 	})
+
 	return nil
 }
 

cointop/statusbar.go

@@ -63,8 +63,9 @@ func (ct *Cointop) UpdateStatusbar(s string) error {
 
 	str = str[:end] + v
 
-	ct.Update(func() {
+	ct.Update(func() error {
 		ct.Views.Statusbar.Update(str)
+		return nil
 	})
 
 	return nil

cointop/table.go

@@ -193,9 +193,9 @@ func (ct *Cointop) RefreshTable() error {
 		ct.highlightRow(currentrow)
 	}
 
-	ct.Update(func() {
+	ct.Update(func() error {
 		if ct.Views.Table.Backing() == nil {
-			return
+			return nil
 		}
 
 		ct.Views.Table.Backing().Clear()
@@ -204,6 +204,7 @@ func (ct *Cointop) RefreshTable() error {
 		go ct.UpdateTableHeader()
 		go ct.updateMarketbar()
 		go ct.UpdateChart()
+		return nil
 	})
 
 	return nil

cointop/table_header.go

@@ -89,12 +89,13 @@ func (ct *Cointop) UpdateTableHeader() {
 		headers = append(headers, str)
 	}
 
-	ct.Update(func() {
+	ct.Update(func() error {
 		if ct.Views.TableHeader.Backing() == nil {
-			return
+			return nil
 		}
 
 		ct.Views.TableHeader.Backing().Clear()
 		fmt.Fprintln(ct.Views.TableHeader.Backing(), strings.Join(headers, ""))
+		return nil
 	})
 }

cointop/update.go

@@ -7,16 +7,14 @@ import (
 )
 
 // Update takes a callback which updates the view
-func (ct *Cointop) Update(f func()) {
+func (ct *Cointop) Update(f func() error) {
 	ct.debuglog(fmt.Sprintf("Update()"))
 
 	if ct.g == nil {
 		panic("gocui is not initialized")
 	}
 
 	ct.g.Update(func(g *gocui.Gui) error {
-		f()
-
-		return nil
+		return f()
 	})
 }