fish-shell/share/functions/__fish_complete_file_url.fish

function __fish_complete_file_url
	set -l comp

	if set -q argv[1]
		set comp $argv[1]
	else
		set comp (commandline -ct)
	end

	set -l prefix (echo $comp|cut -c 1-7)

	if test file:// = $prefix
		set -l stripped (echo $comp|cut -c 8-)
		printf "%s\n" file://(complete -C"echo $stripped") 
	else
		echo file://
	end

end