# -*-eselect-*-  vim: ft=eselect
# Copyright 1999-2011 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$

# This is a portage-only module.
inherit package-manager

DESCRIPTION="Manage the /etc/make.profile symlink"
MAINTAINER="eselect@gentoo.org"
SVN_DATE='$Date$'
VERSION=$(svn_date_to_version "${SVN_DATE}")

# get a list of valid profiles
find_targets() {
	local arch p portdir=${1}
	[[ -n ${portdir} ]] || portdir=$(portageq portdir)

	arch=$(arch)
	[[ -z ${arch} ]] && return 1

	for p in $(sed -n -e "s|^${arch}[[:space:]]\+\([^[:space:]]\+\).*$|\1|p" \
		"${ROOT}${portdir}/profiles/profiles.desc")
	do
		echo ${p}
	done
}

# remove make.profile symlink
remove_symlink() {
	rm "${EROOT}/etc/make.profile"
}

# set the make.profile symlink
set_symlink() {
	local portdir=$(portageq portdir) target=${1} targets arch parch

	if is_number "${target}" ; then
		targets=( $(find_targets "${portdir}") )
		[[ -z ${targets} ]] && die -q "Failed to get a list of valid profiles"
		target=${targets[target - 1]}
	elif [[ -n ${target} && -d ${ROOT}${portdir}/profiles/${target} ]]
	then
		# if the profile was explicitly specified (rather than a number)
		# double check and make sure it's valid
		arch=$(arch)
		[[ -z ${arch} && ${2} != "--force" ]] && return 1

		# do a reverse lookup and find the arch associated with ${target}
		parch=$(sed -n -e \
			"s|^\([[:alnum:]]\+\)[[:space:]].*${target}[[:space:]].*$|\1|p" \
			"${ROOT}${portdir}/profiles/profiles.desc")

		if [[ ${arch} != ${parch} && ${2} != "--force" ]] ; then
			die -q "${target} is not a valid profile for ${arch}"
		fi
	fi

	if [[ -z ${target} ]] ; then
		die -q "Target \"${1}\" doesn't appear to be valid!"
	elif [[ -d ${ROOT}${portdir}/profiles/${target} ]] ; then
		# we must call remove_symlink() here instead of calling
		# it from do_set(), since if the link is removed, we
		# cannot determine $ARCH in find_targets()
		if [[ -L ${EROOT}/etc/make.profile ]] ; then
			remove_symlink \
				|| die -q "Couldn't remove current make.profile symlink"
		fi
		ln -s "$(relative_name \
			"${ROOT}${portdir}" "${EROOT}/etc")/profiles/${target}" \
			"${EROOT}/etc/make.profile"
		# check if the resulting symlink is sane
		if [[ $(canonicalise "${EROOT}/etc/make.profile") \
			!= "$(canonicalise "${EROOT}")"/* ]]; then
			write_warning_msg \
				"Strange path. Check ${EROOT}/etc/make.profile symlink"
		fi
	else
		die -q "Target \"${1}\" doesn't appear to be valid!"
	fi
}

### show action ###

describe_show() {
	echo "Show the current make.profile symlink"
}

do_show() {
	write_list_start "Current make.profile symlink:"
	if [[ -L ${EROOT}/etc/make.profile ]] ; then
		local link=$(canonicalise "${EROOT}/etc/make.profile")
		local portdir=$(portageq portdir)
		local profiledir=$(canonicalise "${ROOT}${portdir}/profiles")
		link=${link##${profiledir}/}
		write_kv_list_entry "${link}" ""
	else
		write_kv_list_entry "(unset)" ""
	fi
}

### list action ###

describe_list() {
	echo "List available profile symlink targets"
}

do_list() {
	local portdir profiledir active targets
	targets=( $(find_targets) )

	[[ -z ${targets} ]] && die -q "Failed to get a list of valid profiles"

	portdir=$(portageq portdir)
	profiledir=$(canonicalise "${ROOT}${portdir}/profiles")
	active=$(canonicalise "${EROOT}/etc/make.profile")
	active=${active##${profiledir}/}
	if [[ -n ${targets[@]} ]] ; then
		local i
		for (( i = 0 ; i < ${#targets[@]} ; i = i + 1 )) ; do
			[[ ${targets[i]} == ${active} ]] \
				&& targets[i]=$(highlight_marker "${targets[i]}")
		done
	fi
	write_list_start "Available profile symlink targets:"
	write_numbered_list "${targets[@]}"
}

### set action ###

describe_set() {
	echo "Set a new profile symlink target"
}

describe_set_parameters() {
	echo "<target>"
}

describe_set_options() {
	echo "target : Target name or number (from 'list' action)"
	echo "--force : Forcibly set the symlink"
}

do_set() {
	local force

	if [[ ${1} == "--force" ]] ; then
		force=${1}
		shift
	fi

	if [[ -z ${1} ]] ; then
		die -q "You didn't tell me what to set the symlink to"
	elif [[ -e ${EROOT}/etc/make.profile ]] &&
		[[ ! -L ${EROOT}/etc/make.profile ]] ; then
		die -q "${EROOT}/etc/make.profile isn't a symlink"
	else
		set_symlink "${1}" ${force} || die -q "Couldn't set a new symlink"
	fi
}