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#!/usr/bin/env bash
#
# Copyright 2014 David Vazgenovich Shakaryan
# Distributed under the terms of the MIT License.
#
# rbpm (ruby path mangler)
# https://github.com/omp/rbpm
# Manage multiple Ruby installations with no black magic.
#
# In order to prevent environment pollution, the output of this script
# is a list of commands which must be sourced. This can be achieved
# through a simple shell function:
#
# rbpm() { source <(/path/to/rbpm.sh "${@}"); }
#
# Placing the above function inside ~/.bashrc (or equivalent) will load
# it upon starting your shell.
: ${RUBIES_PATH:="${HOME}/.rubies"}
_echo() {
echo "echo '${@//\'/\'\\\'\'}'"
}
_export() {
echo "export PATH='${PATH//\'/\'\\\'\'}'"
echo 'hash -r'
}
_warn() {
echo "echo 'rbpm: ${@//\'/\'\\\'\'}' 1>&2"
}
_die() {
[[ -n "${@}" ]] && _warn "${@}"
echo 'false'
exit 1
}
_populate_dirs() {
[[ -d "${RUBIES_PATH}" ]] \
|| _die "directory ${RUBIES_PATH} does not exist."
# Cannot handle paths containing a newline. Only an idiot would
# encounter this in practice.
readarray -t dirs < <(shopt -s nullglob; \
printf '%s\0' "${RUBIES_PATH}"/* | sort -zV | xargs -0n1)
[[ -n "${dirs}" ]] || _die "directory ${RUBIES_PATH} is empty."
}
_populate_selected() {
local dir dirs
IFS=':' read -a dirs <<< "${PATH}"
for dir in "${dirs[@]}"; do
if [[ "${dir}" == "${RUBIES_PATH}/"* ]]; then
dir="${dir%/bin}"
selected+=("${dir##*/}")
fi
done
[[ "${#selected[@]}" -ne 0 ]] || return 1
[[ "${#selected[@]}" -eq 1 ]] \
|| _warn 'warning: multiple rubies found in PATH.'
}
_clear() {
local dir dirs cdirs
IFS=':' read -a dirs <<< "${PATH}"
for dir in "${dirs[@]}"; do
if [[ "${dir}" == "${RUBIES_PATH}/"* ]]; then
_echo "Removing ${dir} from PATH."
else
cdirs+=("${dir}")
fi
done
[[ "${#cdirs[@]}" -ne "${#dirs[@]}" ]] || return 1
PATH="$(IFS=':'; echo "${cdirs[*]}")"
}
_add() {
_echo "Adding ${1}/bin to PATH."
PATH="${1}/bin:${PATH}"
}
rbpm_ls() {
local dir dirs selected str
_populate_dirs
_populate_selected
for dir in "${dirs[@]}"; do
str=" ${dir##*/}"
[[ "${dir##*/}" == "${selected}" ]] && str="${str/ /*}"
_echo "${str}"
done
}
rbpm_get() {
local dir selected
_populate_selected || _die 'no rubies found in PATH.'
for dir in "${selected[@]}"; do
_echo "${dir}"
done
}
rbpm_set() {
[[ -n "${1}" ]] || _die 'set command requires an argument.'
local dir dirs match
_populate_dirs
for dir in "${dirs[@]}"; do
if [[ "${dir##*/}" == *"${1}"* ]]; then
match="${dir}"
fi
done
[[ -n "${match}" ]] || _die 'no matching ruby found.'
_clear
_add "${match}"
_export
}
rbpm_clear() {
_clear || _die 'no rubies found in PATH.'
_export
}
rbpm_help() {
_echo 'Usage: rbpm <command> [args]'
_echo
_echo 'Commands:'
_echo ' ls List all available rubies.'
_echo ' get Display currently selected ruby.'
_echo ' set Select specified ruby.'
_echo ' clear Clear path of any rubies.'
_echo ' help Display this help information.'
}
case "${1}" in
'ls')
rbpm_ls ;;
'get')
rbpm_get ;;
'set')
rbpm_set "${2}" ;;
'clear')
rbpm_clear ;;
*)
rbpm_help ;;
esac
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