Make chart height adjustable

README.md

@@ -307,6 +307,8 @@ Key|Action
 <kbd>Ctrl</kbd>+<kbd>r</kbd>|Force refresh data
 <kbd>Ctrl</kbd>+<kbd>s</kbd>|Save config
 <kbd>Ctrl</kbd>+<kbd>u</kbd>|Jump page up (vim inspired)
+<kbd>Ctrl</kbd>+<kbd>j</kbd>|Increase chart height
+<kbd>Ctrl</kbd>+<kbd>k</kbd>|Decrease chart height
 <kbd>Alt</kbd>+<kbd>↑</kbd>|Sort current column in ascending order
 <kbd>Alt</kbd>+<kbd>↓</kbd>|Sort current column in descending order
 <kbd>Alt</kbd>+<kbd>←</kbd>|Sort column to the left

cointop/actions.go

@@ -51,6 +51,8 @@ func actionsMap() map[string]bool {
 		"hide_currency_convert_menu":        true,
 		"toggle_portfolio":                  true,
 		"toggle_show_portfolio":             true,
+		"enlarge_chart":                     true,
+		"shorten_chart":                     true,
 	}
 }
 

cointop/chart.go

@@ -117,7 +117,7 @@ func (ct *Cointop) ChartPoints(symbol string, name string) error {
 	go ct.updateMarketbar()
 
 	chart := termui.NewLineChart()
-	chart.Height = 10
+	chart.Height = ct.State.chartHeight
 	chart.Border = false
 
 	// NOTE: empty list means don't show x-axis labels
@@ -157,7 +157,7 @@ func (ct *Cointop) ChartPoints(symbol string, name string) error {
 			}
 			for i := range graphData.MarketCapByAvailableSupply {
 				price := graphData.MarketCapByAvailableSupply[i][1]
-				data = append(data, price/1E9)
+				data = append(data, price/1e9)
 			}
 		} else {
 			graphData, err := ct.api.GetCoinGraphData(symbol, name, start, end)
@@ -192,7 +192,7 @@ func (ct *Cointop) ChartPoints(symbol string, name string) error {
 	// calculate layout
 	termui.Body.Align()
 	w := termui.Body.Width
-	h := 10
+	h := chart.Height
 	row := termui.Body.Rows[0]
 	b := row.Buffer()
 	for i := 0; i < h; i = i + 1 {
@@ -220,7 +220,7 @@ func (ct *Cointop) PortfolioChart() error {
 	go ct.updateMarketbar()
 
 	chart := termui.NewLineChart()
-	chart.Height = 10
+	chart.Height = ct.State.chartHeight
 	chart.Border = false
 
 	// NOTE: empty list means don't show x-axis labels
@@ -303,7 +303,7 @@ func (ct *Cointop) PortfolioChart() error {
 	// calculate layout
 	termui.Body.Align()
 	w := termui.Body.Width
-	h := 10
+	h := chart.Height
 	row := termui.Body.Rows[0]
 	b := row.Buffer()
 	for i := 0; i < h; i = i + 1 {
@@ -320,6 +320,32 @@ func (ct *Cointop) PortfolioChart() error {
 	return nil
 }
 
+// ShortenChart decreases the chart height by one row
+func (ct *Cointop) ShortenChart() error {
+	ct.debuglog("ShortenChart()")
+	candidate := ct.State.chartHeight - 1
+	if candidate < 5 {
+		return nil
+	}
+	ct.State.chartHeight = candidate
+
+	go ct.UpdateChart()
+	return nil
+}
+
+// EnlargeChart increases the chart height by one row
+func (ct *Cointop) EnlargeChart() error {
+	ct.debuglog("EnlargeChart()")
+	candidate := ct.State.chartHeight + 1
+	if candidate > 30 {
+		return nil
+	}
+	ct.State.chartHeight = candidate
+
+	go ct.UpdateChart()
+	return nil
+}
+
 // NextChartRange sets the chart to the next range option
 func (ct *Cointop) NextChartRange() error {
 	ct.debuglog("nextChartRange()")

cointop/cointop.go

@@ -71,6 +71,7 @@ type State struct {
 	sortDesc                   bool
 	sortBy                     string
 	onlyTable                  bool
+	chartHeight                int
 }
 
 // Cointop cointop
@@ -184,6 +185,7 @@ func NewCointop(config *Config) (*Cointop, error) {
 			portfolio: &Portfolio{
 				Entries: make(map[string]*PortfolioEntry, 0),
 			},
+			chartHeight: 10,
 		},
 		tableColumnOrder: tableColumnOrder(),
 		Views: &Views{

cointop/keybindings.go

@@ -333,6 +333,10 @@ func (ct *Cointop) keybindings(g *gocui.Gui) error {
 		case "toggle_table_fullscreen":
 			fn = ct.keyfn(ct.ToggleTableFullscreen)
 			view = ""
+		case "enlarge_chart":
+			fn = ct.keyfn(ct.EnlargeChart)
+		case "shorten_chart":
+			fn = ct.keyfn(ct.ShortenChart)
 		default:
 			fn = ct.keyfn(ct.noop)
 		}

cointop/layout.go

@@ -21,7 +21,7 @@ func (ct *Cointop) layout(g *gocui.Gui) error {
 
 	headerHeight := 1
 	marketbarHeight := 1
-	chartHeight := 10
+	chartHeight := ct.State.chartHeight
 	statusbarHeight := 1
 
 	if ct.State.onlyTable {

cointop/shortcuts.go

@@ -23,6 +23,8 @@ func defaultShortcuts() map[string]string {
 		"ctrl+s":    "save",
 		"ctrl+S":    "save",
 		"ctrl+u":    "page_up",
+		"ctrl+j":    "enlarge_chart",
+		"ctrl+k":    "shorten_chart",
 		"alt+up":    "sort_column_asc",
 		"alt+down":  "sort_column_desc",
 		"alt+left":  "sort_left_column",