Bash custom completion to afplay System sounds on Mac

afplay.completion.bash

play() {
	command afplay "/System/Library/Sounds/$1.aiff"
}

_complete_system_sounds ()
{
	local cur
	local LC_ALL='C'

	COMPREPLY=()
	cur=${COMP_WORDS[COMP_CWORD]}

	# Turn case-insensitive matching on if needed
	local nocasematchWasOff=0
	shopt nocasematch >/dev/null || nocasematchWasOff=1
	(( nocasematchWasOff )) && shopt -s nocasematch

	local IFS="
"
	# Store list of sounds
	local sounds=( $(command ls /System/Library/Sounds/  2>/dev/null | xargs -I% basename % .aiff) )

	# Custom case-insensitive matching
	local s matches=()
	for s in ${sounds[@]}; do
	    if [[ "$s" == "$cur"* ]]; then
	    	matches+=("$s");
	    fi
	done

	# Unset 'nocasematch' option if it was unset before
	(( nocasematchWasOff )) && shopt -u nocasematch

	COMPREPLY=("${matches[@]}")

	return 0
}

complete -F _complete_system_sounds play