Allow clearing the clipboard instantly; improve code sharing between platforms; facilitate GUI/TUI client development regarding the clipboard

core/launchClipClearProcessCLIGeneric.go

@@ -0,0 +1,23 @@
+//go:build (windows || darwin || android || termux || wsl) && !returnOnExit
+
+package core
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+)
+
+// launchClipClearProcess launches the automated clipboard clearing process.
+// For non-interactive CLI implementations, an entirely separate process is created for this purpose.
+func launchClipClearProcess(copySubject string) {
+	executableName := os.Args[0]
+	cmd := exec.Command(executableName, "clipclear")
+	writeToStdin(cmd, copySubject)
+	err := cmd.Start()
+	if err != nil {
+		fmt.Println(AnsiError + "Failed to launch automated clipboard clearing process - Does this libmutton implementation support the \"clipclear\" argument?" + AnsiReset)
+		os.Exit(ErrorClipboard)
+	}
+	os.Exit(0) // use os.Exit directly since this version of this function is only meant for non-interactive CLI implementations
+}