Implemented a module that shows exchange rates from exchangeratesapi.io

modules/exchangerates/widget.go

@@ -0,0 +1,69 @@
+// Package exchangerates
+package exchangerates
+
+import (
+	"fmt"
+
+	"github.com/rivo/tview"
+	"github.com/wtfutil/wtf/view"
+)
+
+type Widget struct {
+	view.ScrollableWidget
+
+	settings *Settings
+	rates    map[string]map[string]float64
+	err      error
+}
+
+func NewWidget(app *tview.Application, pages *tview.Pages, settings *Settings) *Widget {
+	widget := Widget{
+		ScrollableWidget: view.NewScrollableWidget(app, settings.common),
+
+		settings: settings,
+	}
+
+	widget.SetRenderFunction(widget.Render)
+
+	return &widget
+}
+
+/* -------------------- Exported Functions -------------------- */
+
+func (widget *Widget) Refresh() {
+
+	rates, err := FetchExchangeRates(widget.settings)
+	if err != nil {
+		widget.err = err
+	} else {
+		widget.rates = rates
+	}
+
+	// The last call should always be to the display function
+	widget.Render()
+}
+
+/* -------------------- Unexported Functions -------------------- */
+
+func (widget *Widget) Render() {
+	widget.Redraw(widget.content)
+}
+
+func (widget *Widget) content() (string, string, bool) {
+	var out string
+
+	if widget.err != nil {
+		out = widget.err.Error()
+	} else {
+		for base, rates := range widget.rates {
+			out += fmt.Sprintf("[%s]Rates from %s[white]\n", widget.settings.common.Colors.Subheading, base)
+			idx := 0
+			for cur, rate := range rates {
+				out += fmt.Sprintf("[%s]%s - %f[white]\n", widget.CommonSettings().RowColor(idx), cur, rate)
+				idx++
+			}
+		}
+	}
+
+	return widget.CommonSettings().Title, out, false
+}