Take a screenshot of the current window, save to /Desktop and open Finder in Hammerspoon

init.lua

-- using real hyper with shift breaks some hotkeys for whatever reason
hyper = {"cmd", "alt", "ctrl"}

-- Take a screenshot of the current window
hs.hotkey.bind(hyper, "d", function()
  file_name = "screenshot-" .. os.time() .. ".png"
  hs.window.focusedWindow():snapshot():saveToFile(os.getenv("HOME") .. "/Desktop/" .. file_name)
  title = hs.window.focusedWindow():title()
  hs.alert.show(title .. "\n\n Saved screenshot as " .. file_name)
  hs.execute('open ~/Desktop/')
end)