working

.gitignore

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+*.exe
+*.syso
+*.rar

build.sh

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+go-winres simply --icon icon.png --manifest gui
+go build -ldflags -H=windowsgui

go.mod

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+module ohidur.com/windows-theme-switcher
+
+go 1.16
+
+require (
+	github.com/getlantern/systray v1.1.0
+	golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac
+)

go.sum

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+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/getlantern/context v0.0.0-20190109183933-c447772a6520 h1:NRUJuo3v3WGC/g5YiyF790gut6oQr5f3FBI88Wv0dx4=
+github.com/getlantern/context v0.0.0-20190109183933-c447772a6520/go.mod h1:L+mq6/vvYHKjCX2oez0CgEAJmbq1fbb/oNJIWQkBybY=
+github.com/getlantern/errors v0.0.0-20190325191628-abdb3e3e36f7 h1:6uJ+sZ/e03gkbqZ0kUG6mfKoqDb4XMAzMIwlajq19So=
+github.com/getlantern/errors v0.0.0-20190325191628-abdb3e3e36f7/go.mod h1:l+xpFBrCtDLpK9qNjxs+cHU6+BAdlBaxHqikB6Lku3A=
+github.com/getlantern/golog v0.0.0-20190830074920-4ef2e798c2d7 h1:guBYzEaLz0Vfc/jv0czrr2z7qyzTOGC9hiQ0VC+hKjk=
+github.com/getlantern/golog v0.0.0-20190830074920-4ef2e798c2d7/go.mod h1:zx/1xUUeYPy3Pcmet8OSXLbF47l+3y6hIPpyLWoR9oc=
+github.com/getlantern/hex v0.0.0-20190417191902-c6586a6fe0b7 h1:micT5vkcr9tOVk1FiH8SWKID8ultN44Z+yzd2y/Vyb0=
+github.com/getlantern/hex v0.0.0-20190417191902-c6586a6fe0b7/go.mod h1:dD3CgOrwlzca8ed61CsZouQS5h5jIzkK9ZWrTcf0s+o=
+github.com/getlantern/hidden v0.0.0-20190325191715-f02dbb02be55 h1:XYzSdCbkzOC0FDNrgJqGRo8PCMFOBFL9py72DRs7bmc=
+github.com/getlantern/hidden v0.0.0-20190325191715-f02dbb02be55/go.mod h1:6mmzY2kW1TOOrVy+r41Za2MxXM+hhqTtY3oBKd2AgFA=
+github.com/getlantern/ops v0.0.0-20190325191751-d70cb0d6f85f h1:wrYrQttPS8FHIRSlsrcuKazukx/xqO/PpLZzZXsF+EA=
+github.com/getlantern/ops v0.0.0-20190325191751-d70cb0d6f85f/go.mod h1:D5ao98qkA6pxftxoqzibIBBrLSUli+kYnJqrgBf9cIA=
+github.com/getlantern/systray v1.1.0 h1:U0wCEqseLi2ok1fE6b88gJklzriavPJixZysZPkZd/Y=
+github.com/getlantern/systray v1.1.0/go.mod h1:AecygODWIsBquJCJFop8MEQcJbWFfw/1yWbVabNgpCM=
+github.com/go-stack/stack v1.8.0 h1:5SgMzNM5HxrEjV0ww2lTmX6E2Izsfxas4+YHWRs3Lsk=
+github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
+github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c h1:rp5dCmg/yLR3mgFuSOe4oEnDDmGLROTvMragMUXpTQw=
+github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c/go.mod h1:X07ZCGwUbLaax7L0S3Tw4hpejzu63ZrrQiUe6W0hcy0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+golang.org/x/sys v0.0.0-20200515095857-1151b9dac4a9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac h1:oN6lz7iLW/YC7un8pq+9bOLyXrprv2+DKfkJY+2LJJw=
+golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

main.go

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+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"strconv"
+	"syscall"
+	"time"
+
+	"github.com/getlantern/systray"
+	"golang.org/x/sys/windows/registry"
+)
+
+const (
+	REGKEY                  = `Software\Microsoft\Windows\CurrentVersion\Themes\Personalize` // in HKCU
+	REGNAME_TASKBAR_TRAY    = `SystemUsesLightTheme`
+	REGNAME_APP_LIGHT_THEME = `AppsUseLightTheme`
+)
+
+func main() {
+	fmt.Println("Dark Mode on:", isDark())
+	go monitor(react)
+	systray.Run(onReady, onExit)
+
+}
+
+func onReady() {
+
+	if isDark() {
+		systray.SetIcon(getIcon("assets/light_mode.ico"))
+	} else {
+		systray.SetIcon(getIcon("assets/dark_mode.ico"))
+	}
+
+	systray.SetTitle("Theme Switch")
+	systray.SetTooltip("Theme switcher")
+
+	mLightMode := systray.AddMenuItem("Light Mode", "Switch to Light Mode")
+	mDarkMode := systray.AddMenuItem("Dark Mode", "Switch to Dark Mode")
+	mExit := systray.AddMenuItem("Exit", "Quit the program")
+
+	go func() {
+		for {
+			select {
+			case <-mLightMode.ClickedCh:
+				fmt.Println("Set light mode")
+				setLightModeTheme()
+			case <-mDarkMode.ClickedCh:
+				fmt.Println("Set dark mode")
+				setDarkModeTheme()
+			case <-mExit.ClickedCh:
+				systray.Quit()
+				return
+			}
+
+		}
+	}()
+
+}
+
+func onExit() {
+	systray.Quit()
+}
+
+func getIcon(s string) []byte {
+	b, err := ioutil.ReadFile(s)
+	if err != nil {
+		fmt.Print(err)
+	}
+	return b
+}
+
+// react to the change
+func react(isDark bool) {
+	if isDark {
+		systray.SetIcon(getIcon("assets/light_mode.ico"))
+
+	} else {
+		systray.SetIcon(getIcon("assets/dark_mode.ico"))
+
+	}
+}
+
+func isDark() bool {
+	k, err := registry.OpenKey(registry.CURRENT_USER, REGKEY, registry.QUERY_VALUE)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer k.Close()
+	val, _, err := k.GetIntegerValue(REGNAME_TASKBAR_TRAY)
+	if err != nil {
+		log.Fatal(err)
+	}
+	return val == 0
+}
+
+func setDarkModeTheme() {
+	setTheme(0)
+}
+
+func setLightModeTheme() {
+	setTheme(1)
+}
+
+func setTheme(themeMode uint32) {
+	k, err := registry.OpenKey(registry.CURRENT_USER, REGKEY, registry.QUERY_VALUE|registry.SET_VALUE)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if err := k.SetDWordValue(REGNAME_TASKBAR_TRAY, themeMode); err != nil {
+		log.Fatal(err)
+	}
+	if err := k.Close(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func monitor(fn func(bool)) {
+	var regNotifyChangeKeyValue *syscall.Proc
+	changed := make(chan bool)
+
+	if advapi32, err := syscall.LoadDLL("Advapi32.dll"); err == nil {
+		if p, err := advapi32.FindProc("RegNotifyChangeKeyValue"); err == nil {
+			regNotifyChangeKeyValue = p
+		} else {
+			log.Fatal("Could not find function RegNotifyChangeKeyValue in Advapi32.dll")
+		}
+	}
+	if regNotifyChangeKeyValue != nil {
+		go func() {
+			k, err := registry.OpenKey(registry.CURRENT_USER, REGKEY, syscall.KEY_NOTIFY|registry.QUERY_VALUE)
+			if err != nil {
+				log.Fatal(err)
+			}
+			var wasDark uint64
+			for {
+				regNotifyChangeKeyValue.Call(uintptr(k), 0, 0x00000001|0x00000004, 0, 0)
+				val, _, err := k.GetIntegerValue(REGNAME_TASKBAR_TRAY)
+				if err != nil {
+					log.Fatal(err)
+				}
+				if val != wasDark {
+					wasDark = val
+					changed <- val == 0
+				}
+			}
+		}()
+	}
+	for {
+		val := <-changed
+		fn(val)
+	}
+
+}
+
+// auto dark mode light mode switch
+
+func getClockTime(tz string) string {
+	t := time.Now()
+	utc, _ := time.LoadLocation(tz)
+
+	hour, min, sec := t.In(utc).Clock()
+	return ItoaTwoDigits(hour) + ":" + ItoaTwoDigits(min) + ":" + ItoaTwoDigits(sec)
+}
+
+// ItoaTwoDigits time.Clock returns one digit on values, so we make sure to convert to two digits
+func ItoaTwoDigits(i int) string {
+	b := "0" + strconv.Itoa(i)
+	return b[len(b)-2:]
+}

readme.md

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+## Windows theme switcher
+
+This program will appear on the system tray and help
+switch the taskbar theme on windows.
+
+
+Install the necessary dependencies
+
+```
+go install github.com/tc-hib/go-winres@latest
+```
+
+
+To build run:
+
+```
+./build.sh
+```
+