Restructure & refactor codebase

internal/glance/widget-clock.go

@@ -0,0 +1,50 @@
+package glance
+
+import (
+	"errors"
+	"fmt"
+	"html/template"
+	"time"
+)
+
+var clockWidgetTemplate = mustParseTemplate("clock.html", "widget-base.html")
+
+type clockWidget struct {
+	widgetBase `yaml:",inline"`
+	cachedHTML template.HTML `yaml:"-"`
+	HourFormat string        `yaml:"hour-format"`
+	Timezones  []struct {
+		Timezone string `yaml:"timezone"`
+		Label    string `yaml:"label"`
+	} `yaml:"timezones"`
+}
+
+func (widget *clockWidget) initialize() error {
+	widget.withTitle("Clock").withError(nil)
+
+	if widget.HourFormat == "" {
+		widget.HourFormat = "24h"
+	} else if widget.HourFormat != "12h" && widget.HourFormat != "24h" {
+		return errors.New("hour-format must be either 12h or 24h")
+	}
+
+	for t := range widget.Timezones {
+		if widget.Timezones[t].Timezone == "" {
+			return errors.New("missing timezone value")
+		}
+
+		_, err := time.LoadLocation(widget.Timezones[t].Timezone)
+
+		if err != nil {
+			return fmt.Errorf("invalid timezone '%s': %v", widget.Timezones[t].Timezone, err)
+		}
+	}
+
+	widget.cachedHTML = widget.renderTemplate(widget, clockWidgetTemplate)
+
+	return nil
+}
+
+func (widget *clockWidget) Render() template.HTML {
+	return widget.cachedHTML
+}