howdy/autocomplete/howdy

#!/bin/bash
# Autocomplete file run in bash
# Will sugest arguments on tab

_howdy() {
	local cur prev opts
	COMPREPLY=()
	# The argument typed so far
	cur="${COMP_WORDS[COMP_CWORD]}"
	# The previous argument
	prev="${COMP_WORDS[COMP_CWORD-1]}"

	# Go though all cases we support
	case "${prev}" in
		# After the main command, show the commands
		"howdy")
			opts="add clear config disable list remove clear test"
			COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
			return 0
			;;
		# For disable, grab the current "disabled" config option and give the reverse
		"disable")
			local status=$(cut -d'=' -f2 <<< $(cat /lib/security/howdy/config.ini | grep 'disabled =') | xargs echo -n)

			[ "$status" == "false" ] && COMPREPLY="true" || COMPREPLY="false"
			return 0
			;;
		# List the users availible
		"-U")
			COMPREPLY=( $(compgen -u -- ${cur}) )
			return 0
			;;
		"--user")
			COMPREPLY=( $(compgen -u -- ${cur}) )
			return 0
			;;
 		*)
		;;
	esac

	# Nothing matched, so return nothing
	return 0
}

# Register the autocomplete function
complete -F _howdy howdy