#!/bin/bash -
#
# defeature - disable a FEATURE on a per-package basis.
#
# <dirtyepic@gentoo.org>

source /usr/lib/portage/bin/isolated-functions.sh

defeature() {
	if [[ ! $# -eq 2 ]]; then
		echo
		eerror "Usage:  $(basename $0) <FEATURE> <pkgname>"
		echo
		exit 1
	fi

	local pkgcat pkgname

	pkgcat=${!#%%/*}
	pkgname=${!###/*}

	if [[ $(equery w =${pkgname} 2>&1 | grep "No masked" ) ]]; then
		echo
		eerror "No package found matching \"${pkgname}\"."
		echo
		exit 1
	fi

	[[ $pkgcat == $pkgname ]] && pkgcat=

	if [[ -z ${pkgcat} ]]; then

		# Need a better way to get category - use udept for now

		# check for ambiguous package names
		if [[ $(dep -1c ${pkgname} | awk 'END { print NR }') -gt 1 ]]; then
			echo
			eerror "Found multiple categories for \"${pkgname}\"."
			eerror "Please use a fully qualified package name (cat/package)."
			echo
			exit 1
		fi

		pkgcat="$(dep -1c ${pkgname})"
	    # strip whitespace
		pkgcat="${pkgcat// /}"
	fi

	[[ ! -d /etc/portage/env/${pkgcat} ]] \
		&& sudo mkdir -p /etc/portage/env/${pkgcat}

	# note that this overwrites anything already in the file
	cat > /etc/portage/env/${pkgcat}/${pkgname} <<-EOF
		NEWFEATURES=

		for f in \${FEATURES}; do
		    if [[ ! \$f == "${1}" ]]; then
				NEWFEATURES="\${NEWFEATURES} \$f"
			fi
		done

		FEATURES="\${NEWFEATURES}"
	EOF

	if [[ $? -eq 0 ]]; then
		echo
		einfo "${1} FEATURE disabled for ${pkgcat}/${pkgname}."
		echo
	fi

	exit 0
}

defeature "$@"