From 804c4b0c124bda83a0e0b771810bb85600d244b5 Mon Sep 17 00:00:00 2001
From: Kevin F <beardog@mailbox.org>
Date: Sat, 24 Dec 2022 15:50:09 -0600
Subject: [PATCH] Initial commit

---
 examples/example.go            | 13 ++++++++
 getwindow/getwindow.go         | 14 +++++++++
 getwindow/getwindow_windows.go | 54 ++++++++++++++++++++++++++++++++++
 3 files changed, 81 insertions(+)
 create mode 100644 examples/example.go
 create mode 100644 getwindow/getwindow.go
 create mode 100644 getwindow/getwindow_windows.go

diff --git a/examples/example.go b/examples/example.go
new file mode 100644
index 0000000..782f8cd
--- /dev/null
+++ b/examples/example.go
@@ -0,0 +1,13 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/egosown/getwindow"
+)
+
+func main() {
+
+	fmt.Println(getwindow.GetWindow())
+
+}
diff --git a/getwindow/getwindow.go b/getwindow/getwindow.go
new file mode 100644
index 0000000..773a7af
--- /dev/null
+++ b/getwindow/getwindow.go
@@ -0,0 +1,14 @@
+//go:build linux
+// +build linux
+
+package getwindow
+
+import "os/exec"
+
+func GetWindow() (string, error) {
+	win, err := exec.Command("xdotool getactivewindow getwindowname").Output()
+	if err != nil {
+		return "", err
+	}
+	return string(win), nil
+}
diff --git a/getwindow/getwindow_windows.go b/getwindow/getwindow_windows.go
new file mode 100644
index 0000000..ece9d2a
--- /dev/null
+++ b/getwindow/getwindow_windows.go
@@ -0,0 +1,54 @@
+//go:build windows
+// +build windows
+
+package getwindow
+
+import (
+	"errors"
+	"golang.org/x/sys/windows"
+	"syscall"
+	"unsafe"
+)
+
+var (
+	mod               = windows.NewLazyDLL("user32.dll")
+	procGetClassNameW = mod.NewProc("GetClassNameW")
+)
+
+type (
+	HANDLE uintptr
+	HWND   HANDLE
+)
+
+func getClassName(hwnd HWND) (name string, err error) {
+	n := make([]uint16, 256)
+	p := &n[0]
+	r0, _, e1 := syscall.Syscall(procGetClassNameW.Addr(), 3, uintptr(hwnd), uintptr(unsafe.Pointer(p)), uintptr(len(n)))
+	if r0 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+		return
+	}
+	name = syscall.UTF16ToString(n)
+	return
+}
+
+func getWindow(funcName string) uintptr {
+	proc := mod.NewProc(funcName)
+	hwnd, _, _ := proc.Call()
+	return hwnd
+}
+
+func GetWindow() (string, error) {
+
+	hwnd := getWindow("GetForegroundWindow")
+	if hwnd != 0 {
+		cn, _ := getClassName(HWND(hwnd))
+		return cn, nil
+	}
+	return "", errors.New("Could not get window")
+
+}