Add group widget

internal/widget/group.go

@@ -0,0 +1,70 @@
+package widget
+
+import (
+	"context"
+	"errors"
+	"html/template"
+	"sync"
+	"time"
+
+	"github.com/glanceapp/glance/internal/assets"
+)
+
+type Group struct {
+	widgetBase `yaml:",inline"`
+	Widgets    Widgets `yaml:"widgets"`
+}
+
+func (widget *Group) Initialize() error {
+	widget.withError(nil)
+	widget.HideHeader = true
+
+	for i := range widget.Widgets {
+		widget.Widgets[i].SetHideHeader(true)
+
+		if widget.Widgets[i].GetType() == "group" {
+			return errors.New("nested groups are not allowed")
+		}
+
+		if err := widget.Widgets[i].Initialize(); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (widget *Group) Update(ctx context.Context) {
+	var wg sync.WaitGroup
+	now := time.Now()
+
+	for w := range widget.Widgets {
+		widget := widget.Widgets[w]
+
+		if !widget.RequiresUpdate(&now) {
+			continue
+		}
+
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			widget.Update(ctx)
+		}()
+	}
+
+	wg.Wait()
+}
+
+func (widget *Group) RequiresUpdate(now *time.Time) bool {
+	for i := range widget.Widgets {
+		if widget.Widgets[i].RequiresUpdate(now) {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (widget *Group) Render() template.HTML {
+	return widget.render(widget, assets.GroupTemplate)
+}