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# Copyright 1999-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$
DESCRIPTION="Manage /usr/bin/chuck audio engine"
MAINTAINER="cedk@gentoo.org"
SVN_DATE='$Date: 2008/07/20 13:49:00 $'
VERSION=$(svn_date_to_version "${SVN_DATE}" )
# find a list of unison symlink targets, best first
find_targets() {
local f
for f in "${ROOT}"/usr/bin/chuck.{jack,alsa,oss}; do
if [[ -f ${f} ]] ; then
echo "${f##*/chuck.}"
fi
done | tac
}
# find version number of currently symlinked version
identify_target() {
local f
f="$(canonicalise "${ROOT}"/usr/bin/chuck)"
echo "${f##*/chuck.}"
}
# try to remove the unison symlink
remove_symlinks() {
rm -f "${ROOT}"/usr/bin/chuck &>/dev/null
}
# set the unison symlink
set_symlinks() {
local target="${1}" targets
if is_number "${target}" && [[ ${target} -ge 1 ]] ; then
targets=( $(find_targets ) )
target=${targets[$(( ${target} - 1 ))]}
fi
if [[ -f "${ROOT}/usr/bin/chuck.${target}" ]] ; then
remove_symlinks
ln -s "chuck.${target}" "${ROOT}/usr/bin/chuck" || \
die "Could not set ${target} /usr/bin/chuck symlink"
else
die -q "Target \"${target}\" doesn't appear to be valid!"
fi
}
### show action ###
describe_show() {
echo "Show the current chuck audio engine"
}
do_show() {
[[ -z "${@}" ]] || die -q "Too many parameters"
write_list_start "Current chuck audio engine:"
if [[ -L "${ROOT}/usr/bin/chuck" ]] ; then
write_kv_list_entry "$(identify_target)" ""
elif [[ -e "${ROOT}/usr/bin/chuck" ]] ; then
write_kv_list_entry "(not a symlink)" ""
else
write_kv_list_entry "(unset)" ""
fi
}
### list action ###
describe_list() {
echo "List available chuck audio engines"
}
do_list() {
[[ -z "${@}" ]] || die -q "Too many parameters"
local i targets current
targets=( $(find_targets ) )
current=$(identify_target)
if [[ -n ${targets[@]} ]] ; then
for (( i = 0 ; i < ${#targets[@]} ; i = i + 1 )) ; do
[[ ${targets[${i}]} == ${current} ]] && \
targets[${i}]="${targets[${i}]} $(highlight '*' )"
done
write_list_start "Available chuck audio engines:"
write_numbered_list "${targets[@]}"
else
write_kv_list_entry "(none found)" ""
fi
}
### set action ###
describe_set() {
echo "Set a new chuck audio engine"
}
describe_set_options() {
echo "target : Target audio engine or index from 'list' action"
}
describe_set_parameters() {
echo "<target>"
}
do_set() {
if [[ -z "${1}" ]] ; then
die -q "You didn't give me an audio engine"
elif [[ -n "${2}" ]] ; then
die -q "Too many parameters"
elif [[ -L "${ROOT}/usr/bin/chuck" ]] ; then
if ! remove_symlinks ; then
die -q "Can't remove existing audio engine symlink"
elif ! set_symlinks "${1}" ; then
die -q "Can't set new audio engine"
fi
elif [[ -e "${ROOT}/usr/bin/chuck" ]] ; then
die -q "${ROOT}/usr/bin/chuck seems to be from an old ebuild, please remove manually"
else
set_symlinks "${1}" || die -q "Can't set new audio engine"
fi
}
### update action ###
describe_update() {
echo "Automatically update the chuck audio engine"
}
describe_update_options() {
echo "--if-unset : Do not override currently selected audio engine"
}
do_update() {
[[ -z "${1}" ]] || ( [[ -z "${2}" ]] && [[ "${1}" == "--if-unset" ]] ) || \
die -q "Usage error"
if [[ -L "${ROOT}/usr/bin/chuck" ]] ; then
[[ ${1} == "--if-unset" ]] && return
remove_symlinks || die -q "Can't remove existing symlink"
fi
if [[ -e "${ROOT}/usr/bin/chuck" ]] ; then
die -q "${ROOT}/usr/bin/chuck seems to be from an old ebuild, please remove manually"
elif ! [[ -z $(find_targets ) ]] ; then
set_symlinks 1 || die -q "Can't set a new audio engine"
fi
}
# vim: ts=4 sw=4 noet fdm=marker
|
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