util-linux/bash-completion/swapon

_swapon_module()
{
	local cur prev OPTS
	COMPREPLY=()
	cur="${COMP_WORDS[COMP_CWORD]}"
	prev="${COMP_WORDS[COMP_CWORD-1]}"
	case $prev in
		'-p'|'--priority')
			# Priority range is -1 to 32767.  Perhaps these
			# few are enough.
			COMPREPLY=( $(compgen -W "$(echo {-1..9} 32767)" -- $cur) )
			return 0
			;;
		'--show')
			# FIXME: how to append to a string with compgen?
			local OUTPUT
			OUTPUT="NAME TYPE SIZE USED PRIO"
			compopt -o nospace
			COMPREPLY=( $(compgen -W "$OUTPUT" -S ',' -- $cur) )
			return 0
			;;
		'-h'|'--help'|'-V'|'--version')
			return 0
			;;
	esac
	case $cur in
		-*)
			OPTS="-a --all
				-d --discard
				-e --ifexists
				-f --fixpgsz
				-p --priority
				-s --summary
				   --show
				   --noheadings
				   --raw
				   --bytes
				-v --verbose
				-h --help
				-V --version"
			COMPREPLY=( $(compgen -W "${OPTS[*]}" -- $cur) )
			return 0
			;;
	esac
	# FIXME: compgen will split SPEC= from '=' point.  The append
	# comma separated value problem is very similar.
	compopt -o filenames
	COMPREPLY=( $(compgen -f -- $cur) )
	return 0
}
complete -F _swapon_module swapon