Open fullscreen album cover of current track in iTunes

how to.md

1. Save as ~/Library/iTunes/Scripts/show cover.scpt
2. Run it from iTunes menu → weird unicode symbol I couldn't find → show cover
3. Fail and get error message
4. Allow iTunes to "control your computer" in macOS System Preferences → Security & Privacy → Privacy → Accessibility
5. Try again

show cover.scpt

tell application "iTunes" to tell artwork 1 of current track
	set srcBytes to raw data
	
	if format is «class PNG » then
		set ext to ".png"
	else if format is JPEG picture then
		set ext to ".jpg"
	end if
end tell

set fileName to (((path to temporary items from user domain) as text) & "cover" & ext)
--display dialog fileName
open for access file the fileName with write permission
write srcBytes to file the fileName starting at eof
close access file the fileName

tell application "Finder"
	open fileName
	
	tell application "System Events" to tell process "Preview"
		repeat until window 1 exists
		end repeat
		
		set value of attribute "AXFullScreen" of window 1 to true
	end tell
end tell