restructured files

app/app.go

@@ -0,0 +1 @@
+package app

app/battery.go

@@ -0,0 +1,88 @@
+package app
+
+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
+}
+
+func (a *App) updateBatteryLabel(b BatteryInfo) {
+	txt := fmt.Sprintf("%d%%", b.Percent)
+	fmt.Println("changed battery label")
+	if b.Charging {
+		txt += " (charging)"
+	}
+	a.batteryLabel.SetText(txt)
+}

app/clock.go

@@ -0,0 +1,26 @@
+package app
+
+import (
+	"time"
+
+	"github.com/mattn/go-gtk/glib"
+)
+
+func startMinuteClock(onTick func(now time.Time)) (stop func()) {
+	quit := make(chan struct{})
+	go func() {
+		for {
+			now := time.Now()
+			next := now.Truncate(time.Minute).Add(time.Minute)
+			wait := time.Until(next)
+			select {
+			case <-time.After(wait):
+				n := time.Now()
+				glib.IdleAdd(func() { onTick(n) })
+			case <-quit:
+				return
+			}
+		}
+	}()
+	return func() { close(quit) }
+}

app/types.go

@@ -0,0 +1,14 @@
+package app
+
+import "github.com/mattn/go-gtk/gtk"
+
+type App struct {
+	battery      BatteryInfo
+	batteryLabel *gtk.Label
+}
+
+type BatteryInfo struct {
+	Percent  int
+	Charging bool
+	Path     string
+}

app/ui.go

@@ -0,0 +1,101 @@
+package app
+
+// #cgo pkg-config: gtk+-2.0
+
+import "C"
+import (
+	"fmt"
+	"math"
+	"runtime"
+	"time"
+
+	"github.com/mattn/go-gtk/gdk"
+	"github.com/mattn/go-gtk/gtk"
+)
+
+func isKindle() bool {
+	return runtime.GOARCH == "arm" || runtime.GOARCH == "arm64"
+}
+
+func Run() {
+	runtime.LockOSThread()
+	gtk.Init(nil)
+
+	app := App{}
+	w, h := screenSizeWithFallback()
+	fmt.Printf("screen size %dx%d\n", w, h)
+
+	win := gtk.NewWindow(gtk.WINDOW_TOPLEVEL)
+	win.SetTitle("L:A_N:application_PC:TS_ID:com.lab126.store")
+	win.SetDefaultSize(w, h)
+	win.Connect("destroy", gtk.MainQuit)
+
+	bg := gtk.NewEventBox()
+	win.Add(bg)
+
+	root := gtk.NewVBox(false, 0)
+	bg.Add(root)
+
+	// top bar
+	topBar := gtk.NewHBox(false, 8)
+	topBar.SetBorderWidth(6)
+	root.PackStart(topBar, false, false, 0)
+
+	leftStatus := gtk.NewLabel("random info here")
+	topBar.PackStart(leftStatus, false, false, 8)
+
+	app.batteryLabel = gtk.NewLabel("Batt --%")
+	netLabel := gtk.NewLabel("Wi-Fi")
+	timeLabel := gtk.NewLabel(time.Now().Format("15:04"))
+
+	topBar.PackEnd(timeLabel, false, false, 8)
+	topBar.PackEnd(netLabel, false, false, 8)
+	topBar.PackEnd(app.batteryLabel, false, false, 8)
+
+	scroll := gtk.NewScrolledWindow(nil, nil)
+	scroll.SetShadowType(gtk.SHADOW_NONE)
+	scroll.SetPolicy(gtk.POLICY_NEVER, gtk.POLICY_NEVER)
+	root.PackStart(scroll, true, true, 0)
+
+	vp := gtk.NewViewport(nil, nil)
+	scroll.Add(vp)
+
+	content := gtk.NewVBox(false, 14)
+
+	vp.Add(content)
+
+	if isKindle() {
+		bg.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
+		scroll.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
+		vp.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
+		content.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
+	}
+
+	title := gtk.NewLabel("")
+	title.SetMarkup("<span size='20000' weight='bold'>some cool text</span>")
+	content.PackStart(title, false, false, 0)
+
+	body := gtk.NewLabel("aaaa")
+	body.SetLineWrap(true)
+	content.PackStart(body, false, false, 0)
+
+	_ = startMinuteClock(func(now time.Time) {
+		timeLabel.SetText(now.Format("15:04"))
+	})
+	initBattery(&app)
+
+	win.ShowAll()
+	gtk.Main()
+
+}
+
+func screenSizeWithFallback() (int, int) {
+	if !isKindle() {
+		return int(math.Round(1072 * 0.8)), int(math.Round(1448 * 0.8))
+	}
+	w, h := gdk.ScreenWidth(), gdk.ScreenHeight()
+	if w <= 0 || h <= 0 {
+		return 1072, 1448
+	}
+	return w, h
+}