Focus back and forth between an application (kitty) to the previous window

back-and-forth.applescript

global previousWin

on getFrontWin()
  tell application "System Events"
          set frontApp to first application process whose frontmost is true
      set frontAppName to name of frontApp
      return frontAppName
  end tell
end getFrontWin

on switchBackForth()
  if (getFrontWin() = "kitty") then
    tell application previousWin
        activate
    end tell
  else if isAppRunning("kitty") then
    set previousWin to getFrontWin()
        tell application "kitty"
        activate
    end tell
  else
    set previousWin to getFrontWin()
    activate application "kitty"
  end if
end switchBackForth

on isAppRunning(appName)
    tell application "System Events" to (name of processes) contains appName
end isAppRunning

on alfred_script(q)
    switchBackForth()
end alfred_script