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# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id: $
DESCRIPTION="Manage {,/usr}/bin/awk implementations"
MAINTAINER="ottxor@gentoo.org"
VERSION="0.2"
## Functions ##
# find a list of awk symlink targets, best first
find_targets() {
local t
for t in \
"${EROOT}/usr/bin/gawk" \
"${EROOT}/usr/bin/mawk" \
"${EROOT}/usr/bin/nawk" \
"${EROOT}/bin/busybox" \
; do
if [[ -x ${t} ]]; then
echo ${t##*/}
fi
done
}
# set the awk symlink
set_symlinks() {
local target=${1} targets extension dir i rel_target
[[ ! -L ${EROOT}/bin/awk && -e ${EROOT}/bin/awk ]] && \
die -q "/bin/awk is not a symlink!"
[[ ! -L ${EROOT}/usr/bin/awk && -e ${EROOT}/usr/bin/awk ]] && \
die -q "/usr/bin/awk is not a symlink!"
if is_number "${target}" && [[ ${target} -ge 1 ]]; then
targets=( $(find_targets) )
target=${targets[target-1]}
fi
if [[ ${target} == "busybox" ]]; then
dir="${EROOT}/bin"
else
dir="${EROOT}/usr/bin"
fi
[[ -x ${dir}/${target} ]] || die -q "Target '${target}' doesn't appear to be valid!"
for i in /bin /usr/bin; do
rel_target=$(relative_name "${dir}/${target}" "${EROOT}${i}")
ln -sf "${rel_target}" "${EROOT}${i}/awk" || \
die -q "Couldn't set ${target} ${i}/awk symlink"
done
rm -f "${EROOT}"/usr/share/man/man1/awk.1{,.bz2,.gz,lzma}
for x in ".1" ".1.bz2" ".1.gz" ".1.lzma" ; do
if [[ -e ${EROOT}/usr/share/man/man1/${target}${x} ]] ; then
extension="${x}"
break
fi
done
#busybox has no man page
if [[ -z "${extension}" ]] ; then
echo "Couldn't find a man page for ${target}; skipping." 1>&2
return 1
fi
if ! ln -s "${target}${extension}" "${EROOT}/usr/share/man/man1/awk${extension}"; then
echo "Couldn't create man page symlink for ${target}; skipping." 1>&2
return 1
fi
}
### show action ###
describe_show() {
echo "Show the current awk implementation"
}
do_show() {
[[ -z ${@} ]] || die -q "Too many parameters"
write_list_start "Current awk implementation:"
if [[ -L ${EROOT}/usr/bin/awk ]]; then
write_kv_list_entry "$(basename $(readlink ${ROOT}/usr/bin/awk))" ""
elif [[ -e ${EROOT}/usr/bin/awk ]]; then
write_kv_list_entry "(not a symlink)" ""
else
write_kv_list_entry "(unset)" ""
fi
}
### list action ###
describe_list() {
echo "List available awk implementations"
}
do_list() {
[[ -z ${@} ]] || die -q "Too many parameters"
local i targets
targets=( $(find_targets) )
for (( i = 0; i < ${#targets[@]}; i++ )) ; do
[[ ${targets[${i}]} == $(basename $(readlink "${EROOT}"/usr/bin/awk)) ]] && \
targets[${i}]=$(highlight_marker "${targets[${i}]}")
done
write_list_start "Available awk implementations:"
write_numbered_list -m '(none found)' "${targets[@]}"
}
### set action ###
describe_set() {
echo "Set a new awk implementation"
}
describe_set_options() {
echo "target : Target name or number (from 'list' action)"
}
describe_set_parameters() {
echo "<target>"
}
do_set() {
if [[ -z ${1} ]]; then
die -q "Not enough parameters"
elif [[ -n ${2} ]]; then
die -q "Too many parameters"
else
set_symlinks "${1}"
fi
}
### update action ###
describe_update() {
echo "Automatically update the awk implementation"
}
describe_update_options() {
echo "ifunset : Do not override existing implementation"
}
do_update() {
[[ -z ${1} || ( -z ${2} && ( ${1} == ifunset || ${1} == '--if-unset' ) ) ]] || \
die -q "Usage error"
[[ ( ${1} == ifunset || ${1} == '--if-unset' ) \
&& -L ${EROOT}/usr/bin/awk && -x ${EROOT}/usr/bin/awk ]] && \
return
set_symlinks 1
}
# vim: set syn=sh :
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