fish-shell/share/functions/__fish_contains_opt.fish

function __fish_contains_opt -d "Checks if a specific option has been given in the current commandline"
	set -l next_short 

	set -l short_opt
	set -l long_opt 

	for i in $argv
		if test $next_short 
			set next_short 
			set -- short_opt $short_opt $i
		else
			switch $i
				case -s
					set next_short 1
				case '-*'
					echo __fish_contains_opt: Unknown option $i
					return 1

				case '**'
					set -- long_opt $long_opt $i
			end
		end
	end

	for i in $short_opt

		if test -z $i
			continue
		end

		if commandline -cpo | grep -- "^-"$i"\|^-[^-]*"$i >/dev/null
			return 0
		end
		
		if commandline -ct | grep -- "^-"$i"\|^-[^-]*"$i >/dev/null
			return 0
		end
	end

	for i in $long_opt
		if test -z $i
			continue
		end

		if contains -- --$i (commandline -cpo)
			return 0
		end
	end

	return 1
end