bash-completion/losetup

_losetup_module()
{
	local cur prev OPTS ARG
	COMPREPLY=()
	cur="${COMP_WORDS[COMP_CWORD]}"
	prev="${COMP_WORDS[COMP_CWORD-1]}"
	case $prev in
		'-d'|'--detach')
			ARG="$($1 --output NAME | awk '{if (1 < NR) {print}}')"
			COMPREPLY=( $(compgen -W "$ARG" -- $cur) )
			return 0
			;;
		'-j'|'--associated')
			ARG="$($1 --output BACK-FILE | awk '{if (1 < NR) {print}}')"
			COMPREPLY=( $(compgen -W "$ARG" -- $cur) )
			return 0
			;;
		'-c'|'--set-capacity')
			ARG="$(for I in /dev/loop[0-9]*; do if [ -e $I ]; then echo $I; fi; done)"
			COMPREPLY=( $(compgen -W "$ARG" -- $cur) )
			return 0
			;;
		'-o'|'--offset'|'--sizelimit')
			COMPREPLY=( $(compgen -W "number" -- $cur) )
			return 0
			;;
		'-O'|'--output')
			# FIXME: how to append to a string with compgen?
			local OUTPUT
			OUTPUT="NAME AUTOCLEAR BACK-FILE BACK-INO
				BACK-MAJ:MIN MAJ:MIN OFFSET PARTSCAN RO
				SIZELIMIT"
			compopt -o nospace
			COMPREPLY=( $(compgen -W "$OUTPUT" -S ',' -- $cur) )
			return 0
			;;
		'-h'|'--help'|'-V'|'--version')
			return 0
			;;
	esac
	case $cur in
		-*)
			OPTS="--all
				--detach
				--detach-all
				--find
				--set-capacity
				--associated
				--list
				--offset
				--output
				--sizelimit
				--partscan
				--read-only
				--show
				--verbose
				--help
				--version"
			COMPREPLY=( $(compgen -W "${OPTS[*]}" -- $cur) )
			return 0
			;;
	esac
	local IFS=$'\n'
	compopt -o filenames
	COMPREPLY=( $(compgen -f -- $cur) )
	return 0
}
complete -F _losetup_module losetup