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# -*-eselect-*-
# Copyright 2005-2014 Gentoo Foundation
# Distributed under the terms of the GNU GPL version 2 or later
#
# DOCUMENTATION
# Following actions possible
# * show do_show()
# * list do_list()
# * set do_set()
# * update do_update()
#
# Behaviour:
# do_show():
# Checks if /usr/bin/gnuclient is a link and if the target exists,
# if yes, it outputs the currently linked gnuclient implementation.
# If it is no symlink, the user is told so, the same if there is
# no /usr/bin/gnuclient or the target does not exist.
# do_list(): List all available gnuclient implementations.
# do_set(): Set a version to be target of the symlink.
# do_update(): Set the target to the "best" available version.
DESCRIPTION="Manage /usr/bin/gnuclient implementations"
MAINTAINER="emacs@gentoo.org"
VERSION="1.17"
BINARYLIST="gnuclient gnudoit gnuattach"
MANPAGELIST="gnuclient gnudoit gnuattach gnuserv"
find_targets() {
# Return the list of available gnuclient implementations
local j
for j in gnuclient-{emacs,xemacs}; do
[[ -f ${EROOT}/usr/bin/${j} ]] && echo ${j}
done
}
remove_symlinks() {
# Remove existing symlinks to binaries and man pages
local f
for f in ${BINARYLIST}; do
rm -f "${EROOT}/usr/bin/${f}"
done
for f in ${MANPAGELIST}; do
rm -f "${EROOT}"/usr/share/man/man1/${f}.1*
done
}
set_bin_symlinks() {
# Set symlinks to binaries
local target=${1#gnuclient-} f
for f in ${BINARYLIST}; do
# set symlink only if target binary actually exists
if [[ -f ${EROOT}/usr/bin/${f}-${target} ]]; then
ln -s "${f}-${target}" "${EROOT}/usr/bin/${f}" || die \
"Couldn't set ${f}-${target} ${EROOT}/usr/bin/${f} symlink"
fi
done
}
set_man_symlinks() {
# Set symlinks to man pages
local target=${1#gnuclient-} suffix f i
for f in ${MANPAGELIST}; do
for i in "${EROOT}/usr/share/man/man1/${f}-${target}.1"*; do
if [[ -f ${i} ]]; then
# target file exists; determine compression suffix
suffix=${i##*/"${f}-${target}.1"}
ln -s "${f}-${target}.1${suffix}" \
"${EROOT}/usr/share/man/man1/${f}.1${suffix}"
fi
done
done
}
set_symlinks() {
# Set symlinks to binaries and man pages
local target=$1 targets
# target may be specified by its name or its index
if is_number "${target}"; then
# numeric index, find the target's name
targets=( $(find_targets) )
[[ ${target} -ge 1 && ${target} -le ${#targets[@]} ]] \
|| die -q "Number out of range: $1"
target=${targets[target-1]}
fi
# is the target valid, i.e. does a gnuclient binary with this name exist?
[[ -f ${EROOT}/usr/bin/${target} ]] \
|| die -q "Target \"$1\" doesn't appear to be valid!"
echo "Switching gnuclient to ${target} ..."
remove_symlinks || die -q "Couldn't remove existing symlink"
set_bin_symlinks "${target}"
set_man_symlinks "${target}"
return 0
}
test_for_root() {
# checks if the user has rights to modify /usr/bin/
[[ -w ${EROOT}/usr/bin ]] || die -q "You need root privileges!"
}
### show action ###
describe_show() {
echo "Show the current target of the gnuclient symlink"
}
do_show() {
[[ $# -gt 0 ]] && die -q "Too many parameters"
write_list_start "Current target of gnuclient symlink:"
if [[ -L ${EROOT}/usr/bin/gnuclient && -e ${EROOT}/usr/bin/gnuclient ]]
then
write_kv_list_entry \
"$(basename "$(readlink "${EROOT}/usr/bin/gnuclient")")" ""
elif [[ -e ${EROOT}/usr/bin/gnuclient ]]; then
write_kv_list_entry \
"(not a symlink or target of symlink does not exist)" ""
else
write_kv_list_entry "(unset)" ""
fi
}
### list action ###
describe_list() {
echo "List available gnuclient symlink targets"
}
do_list() {
[[ $# -gt 0 ]] && die -q "Too many parameters"
local i targets
targets=( $(find_targets) )
for (( i = 0; i < ${#targets[@]}; i++ )); do
# Highlight the currently chosen version
[[ ${targets[i]} = \
"$(basename "$(readlink "${EROOT}/usr/bin/gnuclient")")" ]] \
&& targets[i]=$(highlight_marker "${targets[i]}")
done
write_list_start "Available gnuclient symlink targets:"
write_numbered_list -m "(none found)" "${targets[@]}"
}
### set action ###
describe_set() {
echo "Set a new gnuclient symlink"
}
describe_set_options() {
echo "target : Target name or number (from 'list' action)"
}
describe_set_parameters() {
echo "<target>"
}
do_set() {
[[ -z $1 ]] && die -q "You didn't tell me what to set the symlink to"
[[ $# -gt 1 ]] && die -q "Too many parameters"
test_for_root
if [[ -e ${EROOT}/usr/bin/gnuclient && ! -L ${EROOT}/usr/bin/gnuclient ]]
then
die -q "${EROOT}/usr/bin/gnuclient exists but is not a symlink"
fi
set_symlinks "$1" || die -q "Couldn't set a new symlink"
}
### update action ###
describe_update() {
echo "Automatically update the gnuclient symlink"
}
describe_update_options() {
echo "ifunset : Do not override currently set version"
}
do_update() {
[[ -z $1 || $1 = ifunset || $1 = --if-unset ]] || die -q "Usage error"
[[ $# -gt 1 ]] && die -q "Too many parameters"
test_for_root
if [[ -L ${EROOT}/usr/bin/gnuclient ]]; then
if [[ $1 == *if*unset && -e ${EROOT}/usr/bin/gnuclient ]]; then
return 0
fi
remove_symlinks || die -q "Couldn't remove existing symlink"
elif [[ -e ${EROOT}/usr/bin/gnuclient ]]; then
die -q "${EROOT}/usr/bin/gnuclient exists but is not a symlink"
fi
local targets=( $(find_targets) )
if [[ ${#targets[@]} -gt 0 ]]; then
set_symlinks "${targets[0]}" || die -q "Couldn't set a new symlink"
fi
}
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