added basic ui, added working clock and battery indicator

battery.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/mattn/go-gtk/glib"
+)
+
+func initBattery(a *App) {
+	base := "/sys/class/power_supply"
+	entries, err := os.ReadDir(base)
+	if err != nil {
+		fmt.Println("battery init:", err)
+		return
+	}
+
+	var folder string
+	for _, e := range entries {
+		if strings.Contains(strings.ToLower(e.Name()), "bat") {
+			folder = e.Name()
+			break
+		}
+	}
+	if folder == "" {
+		fmt.Println("no battery folder found")
+		return
+	}
+	rootPath := base + "/" + folder
+
+	info, err := readBattery(rootPath)
+	if err != nil {
+		fmt.Println("read battery:", err)
+		return
+	}
+	a.battery = info
+	a.updateBatteryLabel(info)
+
+	go func() {
+		last := info
+		for {
+			cur, err := readBattery(rootPath)
+			if err == nil &&
+				(cur.Percent != last.Percent || cur.Charging != last.Charging) {
+				last = cur
+				a.battery = cur
+				glib.IdleAdd(func() {
+					a.updateBatteryLabel(cur)
+				})
+			}
+			time.Sleep(30 * time.Second)
+		}
+	}()
+
+}
+
+func readBattery(rootPath string) (BatteryInfo, error) {
+	val, err := os.ReadFile(rootPath + "/capacity")
+	if err != nil {
+		return BatteryInfo{}, err
+	}
+	status, err := os.ReadFile(rootPath + "/status")
+	if err != nil {
+		return BatteryInfo{}, err
+	}
+
+	p, err := strconv.Atoi(strings.TrimSpace(string(val)))
+	if err != nil {
+		return BatteryInfo{}, err
+	}
+
+	s := strings.ToLower(strings.TrimSpace(string(status)))
+	charging := !strings.Contains(s, "dis")
+
+	return BatteryInfo{Percent: p, Charging: charging, Path: rootPath}, nil
+}