# @FUNCTION: optfeature

# @USAGE: <short description> <package atom to match> [other atoms]

# @DESCRIPTION:

# Print out a message suggesting an optional package (or packages) which

# provide the described functionality

#

# The following snippet would suggest app-misc/foo for optional foo support,

# app-misc/bar or app-misc/baz[bar] for optional bar support

# and either both app-misc/a and app-misc/b or app-misc/c for alphabet support.

# @CODE:

# 		optfeature "foo support" app-misc/foo

# 		optfeature "bar support" app-misc/bar app-misc/baz[bar]

#		optfeature "alphabet support" \( app-misc/a app-misc/b \) app-misc/c

#

optfeature() {

	debug-print-function ${FUNCNAME} "$@"

	local i

	local desc=$1

	local flag=0

	local innercount=0

	local innerflag=0

	shift

	for i; do

		if [[ "$i" == "(" ]]; then		

			innercount=0

			innerflag=0

			flag=2

		elif [[ $flag -eq 2 ]]; then

			if [[ "$i" == ")" ]]; then

				if [[ $innercount -eq $innerflag ]]; then

					flag=1

					break

				else

					flag=0

				fi

			else

				innercount=$((innercount+1))

				if has_version $i; then

					innerflag=$((innerflag+1))

				fi

			fi			

		elif has_version "$i"; then

			flag=1

			break

		fi

	done

	if [[ $flag -eq 0 ]]; then

		local andflag=0

		local msg=""

		for i in "$@"; do

			if [[ "$i" == "(" ]]; then

				andflag=1

				msg=" "

			elif [[ "$i" == ")" ]]; then

				andflag=0

				msg="${msg:0: -4} for ${desc}"

				elog "${msg}"

			elif [[ $andflag -eq 1 ]]; then

				msg="${msg} ${i} and"

			else

				elog "  $i for ${desc}"

			fi

		done

	fi

}