simple applescript for midipipe, to allow MIDI control of amazon music player in Chrome

midipipe-amazon-music-control.applescript

on isMidiButtonPressed(msg, bNumber)
	return ((item 1 of msg = 191) and (item 2 of msg = bNumber) and (item 3 of msg > 0))
end isMidiButtonPressed

on jsClick(theTab, sel)
	tell application "Google Chrome"
		execute theTab javascript ("document.querySelector('" & sel & "').click()")
	end tell
end jsClick

on runme(message)
	
	tell application "Google Chrome"
		repeat with t in tabs of windows
			tell t
				if URL starts with "https://music.amazon.co.uk/" then
					
					if (my isMidiButtonPressed(message, 117)) then
						my jsClick(it, ".playButton")
					end if
					
					if (my isMidiButtonPressed(message, 115)) then
						my jsClick(it, ".nextButton")
					end if
					
					if (my isMidiButtonPressed(message, 114)) then
						my jsClick(it, ".previousButton")
					end if
				end if
			end tell
		end repeat
	end tell
end runme