Added argument parsing functions (2735a65c) · Commits · Dom Sekotill / git-hooks

git-hooks

+117 −1

Original line number	Diff line number	Diff line
		@@ -32,6 +32,122 @@ usage ()
		USAGE
		}

		die ()
		{
		printf -- "$@"
		echo
		exit 1
		} >&2

		add_arg ()
		{
		local argtype=$1 argname=$2 dest=$3 default=$4 metavar=$5
		if [ "$argtype" = FLAG ]; then
		default=no
		elif [ "$argtype" = VALUE ]; then
		echo -n
		else
		die "'argtype' must be one of 'FLAG' or 'VALUE'"
		fi
		dest=${dest:-$argname}
		dest=${dest##-}
		dest=${dest##-}
		dest=${dest//-/_}
		metavar=${metavar:-`echo $dest \| tr [a-z] [A-Z]`}
		eval _ARGS_${argtype}_${dest}=\"$dest,$metavar,$argtype,$default$'\n'$argname\"
		}

		add_arg_alias ()
		{
		local dest=$1 alias=$2 var flag_var value_var
		dest=${dest##-}
		dest=${dest##-}
		dest=${dest//-/_}
		flag_var=_ARGS_FLAG_$dest
		value_var=_ARGS_VALUE_$dest
		if [ "${!flag_var}" ]; then
		var="$flag_var"
		elif [ "${!value_var}" ]; then
		var="$value_var"
		else
		die "$dest is not a valid argument or destination"
		fi
		eval "$var=\"\$$var,$alias\""
		}

		add_option ()
		{
		local dest=$1 default=$2 required=$3 metavar=$4
		required=${required:-yes}
		[ "$required" = yes ] \|\| [ "$required" = no ] \|\| \
		die "'required' must be one of 'yes' or 'no'"
		metavar=${metavar:-$dest}
		eval _OPTS_$dest=$dest,$metavar,$required,\"$default\"
		}

		sumarise_args ()
		{
		local ignore_long_flag short_flags long_flags values
		local arg dest metavar argtype default names required
		local yes=" <%s>" no=" [<%s>]"
		local IFS
		for arg in ${!_ARGS_*}; do
		{
		IFS=,
		read dest metavar argtype default
		read -a names
		} <<< "${!arg}"
		if [ "$argtype" = FLAG ]; then
		ignore_long_flag=no
		for name in ${names[@]}; do
		case $name in
		-?)
		short_flags="${short_flags:--}${name#-}"
		ignore_long_flag=yes
		break ;;
		esac
		done
		if [ "$ignore_long_flag" = no ]; then
		long_flags="$long_flags [${names[0]}]"
		fi
		else
		values="$values [${names[0]} <$metavar>]"
		fi
		done
		printf -- "${short_flags:+ [$short_flags]}$long_flags$values"
		for arg in ${!_OPTS_*}; do
		IFS=, read dest metavar required default <<< "${!arg}"
		printf "${!required}" $metavar
		done
		echo
		}

		parse_args ()
		{
		local command=$1
		shift
		while [ "$1" ]; do
		case "$1" in
		--help\|-h)
		printf "$BIN $command"
		sumarise_args
		return 1
		;;
		--summary)
		echo "$summary"
		return 1
		;;
		esac
		shift
		done
		}

		free_args ()
		{
		for arg in ${!_ARGS_} ${!_OPTS_}; do
		eval unset $arg
		done
		}

		cmd_init ()
		{
		@@ -54,7 +170,7 @@ cmd_help ()
		exit 0
		}

		cmd_$1 "${@:2}"
		cmd_$1 "$@"

		if [ $? -eq 127 ]; then
		usage