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# -*-eselect-*- vim: ft=eselect
# Copyright 2014 Gentoo Foundation
# Distributed under the terms of the GNU GPL version 2 or later
DESCRIPTION="Manage the Rust compiler versions"
MAINTAINER="jauhien@gentoo.org"
VERSION="0.2"
inherit package-manager path-manipulation
SITELISP=/usr/share/emacs/site-lisp
SITEVIM=/usr/share/vim/vimfiles
SITEZSH=/usr/share/zsh/site-functions
# find a list of installed rust compilers
# each compiler provider should install
# a config file named provider-$pkgname-$pkgver
# in "${EROOT}"/etc/env.d/rust directory
# this function prints list of $pkgname-$pkgver values
find_targets() {
local f
local -a providers
for f in "${EROOT}"/etc/env.d/rust/provider-*; do
[[ -f ${f} ]] || continue
providers=("${providers[@]}" "${f##*/provider-}")
done
echo "${providers[@]}"
}
#get rustc postfix
get_postfix() {
local target=$1
echo "${target}" | cut -d- -f2-
}
# remove symlink if exists
remove_symlink() {
local symlink=$1
if [[ -L ${symlink} ]]; then
# existing symlink
rm ${symlink} || die -q "Couldn't remove existing symlink ${symlink}"
elif [[ -e ${symlink} ]]; then
# we have something strange
die -q "${symlink} exists but is not a symlink"
fi
}
# set symlink if source exists
set_symlink() {
local source=$1
local dest=$2
if [[ -e ${source} ]]; then
mkdir -p "$(dirname ${dest})" || die -q "directory creation failed for $(dirname ${dest})"
ln -s "${source}" "${dest}" || die -q "${dest} symlink setting failed"
else
false
fi
}
# unset the rust version
unset_version() {
remove_symlink "${EROOT}"/usr/bin/rustc
remove_symlink "${EROOT}"/usr/bin/rustdoc
}
# set the rust version
# each compiler provider should install
# files named rustc-$postfix and rustdoc-$postfix
# in ${EROOT}/usr/bin directory
# $postfix is defined as the part of $pkgname-$pkgver after the first -
# for dev-lang/rust-bin-9999 ebuild it would be bin-9999
set_version() {
local target=$1
if is_number "${target}"; then
local targets=( $(find_targets) )
target=${targets[target-1]}
fi
target=$(get_postfix ${target})
[[ -z ${target} || ! -x "${EROOT}/usr/bin/rustc-${target}" ]] \
&& die -q "Target \"$1\" doesn't appear to be valid!"
unset_version
set_symlink "${EROOT}/usr/bin/rustc-${target}" "${EROOT}/usr/bin/rustc" || die -q "rustc symlink setting failed"
set_symlink "${EROOT}/usr/bin/rustdoc-${target}" "${EROOT}/usr/bin/rustdoc" || die -q "rustdoc symlink setting failed"
}
### list action ###
describe_list() {
echo "List available Rust versions"
}
do_list() {
local i targets=( $(find_targets) )
write_list_start "Available Rust versions:"
for (( i = 0; i < ${#targets[@]}; i++ )); do
# highlight the target where the symlink is pointing to
[[ rustc-$(get_postfix ${targets[i]}) = \
$(basename "$(canonicalise "${EROOT}/usr/bin/rustc")") ]] \
&& targets[i]=$(highlight_marker "${targets[i]}")
done
write_numbered_list -m "(none found)" "${targets[@]}"
}
### set action ###
describe_set() {
echo "Set active Rust version"
}
describe_set_parameters() {
echo "<target>"
}
describe_set_options() {
echo "target : Target number (from 'list' action)"
}
do_set() {
[[ -z $1 ]] && die -q "You didn't tell me what to set the version to"
[[ $# -gt 1 ]] && die -q "Too many parameters"
set_version "$1" || die -q "Couldn't set new active version"
}
### update action ###
describe_update() {
echo "Switch to the most recent Rust compiler"
}
describe_update_options() {
echo "--if-unset : Do not override existing implementation"
}
do_update() {
local if_unset="0"
while [[ $# > 0 ]]; do
case "$1" in
--if-unset)
if_unset="1"
;;
*)
die -q "Unrecognized argument '$1'"
;;
esac
shift
done
if [[ "${if_unset}" == "1" && -f "${EROOT}"/usr/bin/rustc ]]; then
return
fi
local targets=( $(find_targets) )
do_set ${#targets[@]}
}
### unset action ###
describe_unset() {
echo "Unset active Rust version"
}
describe_unset_options() {
echo "--if-invalid : Unset only if symlink is invalid (e.g. package was uninstalled)"
}
do_unset() {
local if_invalid="0"
while [[ $# > 0 ]]; do
case "$1" in
--if-invalid)
if_invalid="1"
;;
*)
die -q "Unrecognized argument '$1'"
;;
esac
shift
done
if [[ "${if_invalid}" == "1" && -e "${EROOT}"/usr/bin/rustc ]]; then
return
fi
unset_version || die -q "Couldn't unset active version"
}
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