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# Copyright 2005-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$
#
# DOCUMENTATION
# Following actions possible
# * show do_show()
# * list do_list()
# * set do_set()
# * update do_update()
#
# Behaviour:
# do_show():
# Checks if /usr/bin/emacs is a link and if the target exists,
# if yes, it outputs the currently linked Emacs version.
# If it is no symlink, the user is told so, the same if there is
# no /usr/bin/emacs or the target does not exist.
# do_list(): List all available versions of GNU Emacs
# do_set(): Set a version to be target of the symlink.
# do_update(): Set the target to the highest version available
# (optionally: only if not set)
bindir=/usr/bin
man1dir=/usr/share/man/man1
infodir=/usr/share/info
envdir=/etc/env.d
DESCRIPTION="Manage ${bindir}/emacs version"
MAINTAINER="emacs@gentoo.org"
SVN_DATE='$Date$'
VERSION=$(svn_date_to_version "${SVN_DATE}" )
# ctags and etags are handled in their own module
BINARYLIST="emacsclient b2m ebrowse rcs-checkin grep-changelog"
MANPAGELIST="emacs emacsclient ebrowse gfdl"
find_targets() {
# Return the list of available Emacs binaries
local j
for j in "${ROOT}${bindir}"/emacs-[0-9]*; do
[[ -f ${j} ]] && basename ${j}
done
}
remove_infopath() {
# When cleaning symlinks this takes care of the info documentation settings
rm -f "${ROOT}${envdir}/50emacs"
}
# Define INFOPATH environment variable in env file
set_infopath() {
[[ -d "${ROOT}${infodir}/${1}" ]] || return 1
echo "INFOPATH=${infodir}/${1}" > "${ROOT}${envdir}/50emacs"
}
remove_symlinks() {
# Remove existing symlinks to binaries, man pages,
# and the env file (own function)
local f
rm -f "${ROOT}${bindir}/emacs"
for f in ${BINARYLIST}; do
rm -f "${ROOT}${bindir}/${f}"
done
for f in ${MANPAGELIST}; do
rm -f "${ROOT}${man1dir}"/${f}.1*
done
remove_infopath
}
set_bin_symlinks() {
# Set symlinks to binaries in /usr/bin/
local target=${1} f
for f in ${BINARYLIST}; do
# set symlink only if target binary actually exists
if [[ -f "${ROOT}${bindir}/${f}-${target}" ]]; then
ln -s "${f}-${target}" "${ROOT}${bindir}/${f}" ||
die "Couldn't set ${f}-${target} ${ROOT}${bindir}/${f} symlink"
fi
done
}
set_man_symlinks() {
# Set symlinks to man pages
local target=${1} extension f i
for f in ${MANPAGELIST}; do
for i in "${ROOT}${man1dir}"/${f}-${target}.1*; do
if [[ -f ${i} ]]; then
# target file exists; determine compress extension
extension=${i##*/${f}-${target}.1}
ln -s "${f}-${target}.1${extension}" \
"${ROOT}${man1dir}/${f}.1${extension}"
fi
done
done
}
set_symlinks() {
# Set symlinks to binaries and man pages, update info path
local target="${1}" nomain="${2}" targets
# target may be specified by its name or its index
if is_number "${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[$(( ${target} - 1 ))]}
fi
# is the target valid, i.e. does an Emacs binary with this name exist?
[[ -f "${ROOT}${bindir}/${target}" ]] \
|| die -q "Target \"${1}\" doesn't appear to be valid!"
echo "Switching emacs to ${target} ..."
remove_symlinks || die -q "Couldn't remove existing symlink"
# the main /usr/bin/emacs symlink is only set for Emacs binaries
# (but not for other providers of auxiliary programs, e.g., XEmacs)
if [[ -z ${nomain} ]]; then
ln -s "${target}" "${ROOT}${bindir}/emacs" \
|| die "Couldn't set ${target} ${ROOT}${bindir}/emacs symlink"
fi
set_bin_symlinks "${target}"
set_man_symlinks "${target}"
set_infopath "${target}"
# update /etc/profile.env from /etc/env.d files
# requires >=eselect-1.0.10 for "noldconfig" option
do_action env update noldconfig
return 0
}
xemacs_info() {
# This is just informational to tell that XEmacs has been found,
# a wish from graaff
if [[ -e "${ROOT}${bindir}/xemacs" ]]; then
echo
write_list_start "XEmacs is also installed"
fi
}
vim_info() {
# Don't take this too serious
if [[ -e "${ROOT}${bindir}/vi" ]]; then
echo
write_list_start "Vi found, your system is in real trouble now! ;)"
fi
}
test_for_root() {
# checks if the user has rights to modify /usr/bin/
[[ -w "${ROOT}${bindir}" ]] || die -q "You need root privileges!"
}
### show action ###
describe_show() {
echo "Show the current target of the Emacs symlink"
}
do_show() {
[[ ${#@} -gt 0 ]] && die -q "Too many parameters"
write_list_start "Current target of Emacs symlink:"
if [[ -L "${ROOT}${bindir}/emacs" && \
-e $(canonicalise "${ROOT}${bindir}/emacs") ]]; then
write_kv_list_entry \
$(basename $(readlink "${ROOT}${bindir}/emacs") ) ""
elif [[ -e "${ROOT}${bindir}/emacs" ]]; then
write_kv_list_entry \
"(not a symlink or target of symlink does not exist)" ""
else
write_kv_list_entry "(unset)" ""
fi
xemacs_info
#vim_info
}
### list action ###
describe_list() {
echo "List available Emacs symlink targets"
}
do_list() {
[[ ${#@} -gt 0 ]] && die -q "Too many parameters"
local i targets
targets=( $(find_targets) )
if [[ -n ${targets[@]} ]]; then
for (( i = 0; i < ${#targets[@]}; i = i + 1 )); do
# Display a star to indicate the currently chosen version
[[ ${targets[${i}]} = \
$(basename $(readlink "${ROOT}${bindir}/emacs") ) ]] \
&& targets[${i}]="${targets[${i}]} $(highlight '*')"
done
write_list_start "Available Emacs symlink targets:"
write_numbered_list "${targets[@]}"
else
write_kv_list_entry "(none found)" ""
fi
xemacs_info
#vim_info
}
### set action ###
describe_set() {
echo "Set a new Emacs 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"
[[ ${#@} -gt 1 ]] && die -q "Too many parameters"
test_for_root
if [[ -e "${ROOT}${bindir}/emacs" && ! -L "${ROOT}${bindir}/emacs" ]]; then
die -q "${ROOT}${bindir}/emacs exists but is not a symlink"
fi
set_symlinks "${1}" || die -q "Couldn't set a new symlink"
# ctags symlinks are handled in an own module now
do_action ctags update
}
### update action ###
describe_update() {
echo "Automatically update the Emacs 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"
[[ ${#@} -gt 1 ]] && die -q "Too many parameters"
test_for_root
if [[ -L "${ROOT}${bindir}/emacs" ]]; then
[[ ${1} == *if*unset \
&& -e $(canonicalise "${ROOT}${bindir}/emacs") ]] \
&& return
# this is not redundant: "update" is called in pkg_postrm() of emacs
# and should clean up any dead symlinks if no valid target exists
remove_symlinks || die -q "Couldn't remove existing symlink"
elif [[ -e "${ROOT}${bindir}/emacs" ]]; then
die -q "${ROOT}${bindir}/emacs exists but is not a symlink"
fi
local targets=( $(find_targets) )
if [[ ${#targets[@]} -gt 0 ]]; then
set_symlinks ${#targets[@]} || die -q "Couldn't set a new symlink"
elif [[ -f "${ROOT}${bindir}/xemacs" ]]; then
# no Emacs target found -- link ctags, etags etc. to XEmacs versions
set_symlinks xemacs nomain
fi
# ctags symlinks are handled in an own module now
do_action ctags update
}
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