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# Copyright 1999-2009 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id: $
DESCRIPTION="Manage the /usr/bin/python and python.1 man symlinks."
MAINTAINER="python@gentoo.org"
SVN_DATE='$Date$'
VERSION=$(svn_date_to_version "${SVN_DATE}" )
ENV_D_PATH="${ROOT%/}/etc/env.d"
INTERPRETER_PATH="${ROOT%/}/usr/bin/"
MAN_PATH="${ROOT%/}/usr/share/man/man1/"
# Find a list of python versions
find_targets() {
local interpreter
# Think twice before adding jython to this list. /usr/bin/jython
# is a bash wrapper that calls java-config, which is a python
# script, so you need a valid /usr/bin/python to start jython.
for interpreter in "${INTERPRETER_PATH}"python?.?; do
echo ${interpreter#${INTERPRETER_PATH}}
done
}
# Try to remove python and python.1 symlinks
remove_symlinks() {
local symlink symlink_target symlink_target_found
rm -f "${INTERPRETER_PATH}"{idle,pydoc,python,python-config} &>/dev/null && \
rm -f "${MAN_PATH}"python.1{,.gz,.bz2,.lzma} &>/dev/null
for symlink in "${INTERPRETER_PATH}python"?; do
[[ ! -L "${symlink}" ]] && continue
symlink_target_found=0
for symlink_target in "${symlink}".?; do
[[ -f "${symlink_target}" ]] && symlink_target_found=1
done
if [[ "${symlink_target_found}" -eq 0 ]]; then
rm -f "${symlink}"
fi
done
}
# Set a man page symlink
set_man_symlink() {
local target="${1}" x extension
for x in ".1" ".1.bz2" ".1.gz" ".1.lzma"; do
if [[ -e "${MAN_PATH}${target}${x}" ]]; then
extension="${x}"
break
fi
done
if [[ -z "${extension}" ]]; then
echo "Couldn't find a man page for ${target}; skipping." 1>&2
return 1
fi
pushd "${MAN_PATH}" 1>/dev/null
ln -nfs "${target}${extension}" "python${extension}"
popd 1>/dev/null
}
# Set python and python.1 symlinks
set_symlinks() {
local target="${1}" targets=($(find_targets ))
if is_number "${target}" && [[ ${target} -ge 1 ]]; then
target=${targets[$(( ${target} - 1 ))]}
fi
if ! has ${target} "${targets[@]}"; then
die -q "Invalid target ${target}"
fi
if [[ -f "${INTERPRETER_PATH}${target}" ]]; then
remove_symlinks
set_man_symlink "${target}"
pushd "${INTERPRETER_PATH}" 1>/dev/null
ln -nfs "${target}" python
ln -nfs "${target}" "${target%.*}"
ln -nfs "${target/python/python-config-}" python-config
ln -nfs "${target/python/pydoc}" pydoc
ln -nfs "${target/python/idle}" idle
# 2to3 for >=2.6
if [[ -f "${INTERPRETER_PATH}${target/python/2to3-}" ]]; then
ln -nfs "${target/python/2to3-}" 2to3
fi
popd 1>/dev/null
else
die -q "Target \"${1}\" doesn't appear to be valid!"
fi
}
# Set the content of /etc/env.d/65python-docs
set_python_docs() {
local path target="${1#python}" variable
rm -f "${ENV_D_PATH}/65python-docs"
if [[ -f "${ENV_D_PATH}/60python-docs-${target}" ]]; then
variable="PYTHONDOCS_${target//./_}"
path="$(. "${ENV_D_PATH}/60python-docs-${target}"; echo -n "${!variable}")"
if [[ -d "${path}" ]]; then
echo "PYTHONDOCS=\"${path}\"" > "${ENV_D_PATH}/65python-docs"
fi
fi
}
### show action
describe_show() {
echo "Show the active python interpreter"
}
do_show() {
active=$(canonicalise "${INTERPRETER_PATH}python")
echo ${active#${INTERPRETER_PATH}}
}
### list action ###
describe_list() {
echo "List installed python interpreters"
}
do_list() {
local targets=( $(find_targets) )
write_list_start "Available python interpreters:"
if [[ -n ${targets[@]} ]]; then
# mark the active python
local i active=$(do_show)
for ((i = 0; i < ${#targets[@]}; i = i + 1)); do
[[ ${targets[${i}]} == $active ]] && \
targets[${i}]="${targets[${i}]} $(highlight '*' )"
done
write_numbered_list "${targets[@]}"
else
write_kv_list_entry "(none found)" ""
fi
}
### set action ###
describe_set() {
echo "Set active python interpreter."
}
do_set() {
if [[ -z "${1}" ]]; then
die -q "You didn't tell me which python interpreter to use"
elif [[ -n "${2}" ]]; then
die -q "Too many parameters"
elif [[ -L "${INTERPRETER_PATH}python" ]]; then
if ! remove_symlinks; then
die -q "Can't remove existing provider"
elif ! set_symlinks "${1}"; then
die -q "Can't set new provider"
fi
set_python_docs "${1}"
elif [[ -e "${INTERPRETER_PATH}python" ]]; then
die -q "Sorry, ${INTERPRETER_PATH}python is not a symlink"
else
set_symlinks "${1}" || die -q "Can't set a new provider"
fi
}
### update action ###
describe_update() {
echo "Switch to the most recent CPython."
}
describe_update_options() {
echo "--if-unset : Do not override existing implementation"
echo "--ignore SLOT : Ignore SLOT when setting symlinks"
}
do_update() {
local if_unset=false ignored_slots=() slot=
while [[ $# > 0 ]]; do
case $1 in
--if-unset)
if_unset=true
;;
--ignore)
ignored_slots=( ${ignored_slots[@]} "${2}" )
shift;;
--*)
die -q "Unrecognized option '$1'"
;;
esac
shift
done
if [[ -L "${ROOT%/}/usr/bin/python" ]]; then
${if_unset} && return
fi
local targets=( $(cd "${INTERPRETER_PATH}"; ls python?.?|sort -r) ) target
# Ignore slots
for slot in ${ignored_slots[@]}; do
targets=( ${targets[@]/python${slot}/} )
done
target=${targets[0]}
echo "Switching to ${target}"
do_set ${target}
}
# vim: set ft=eselect :
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