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#!/usr/bin/env bash
#
# Copyright 2014 David Vazgenovich Shakaryan
# Distributed under the terms of the MIT License.
#
# gbpm
# https://git.potato.am/gbpm.git/
# Manage multiple Python/Ruby/etc. installations with no black magic.
#
# Output must be executed: gbpm() { . <(/path/to/gbpm.sh "${@}"); }
GBPM_VERSION='0.4'
: ${GBPM_OPTS_PATH:="${HOME}/.pythons"}
_echo() {
echo "echo '${@//\'/\'\\\'\'}'"
}
_export() {
echo "export PATH='${PATH//\'/\'\\\'\'}'"
echo 'hash -r'
}
_warn() {
echo "echo 'gbpm: ${@//\'/\'\\\'\'}' >&2"
}
_die() {
[[ -n "${@}" ]] && _warn "${@}"
echo 'false'
exit 1
}
_populate_dirs() {
[[ -d "${GBPM_OPTS_PATH}" ]] \
|| _die "directory ${GBPM_OPTS_PATH} does not exist"
mapfile -td $'\0' dirs < <(shopt -s nullglob;
printf '%s\0' "${GBPM_OPTS_PATH}"/* | sort -zV)
[[ -n "${dirs}" ]] || _die "directory ${GBPM_OPTS_PATH} is empty"
}
_populate_selected() {
local dir dirs
mapfile -td : dirs < <(printf %s "${PATH}")
selected=()
for dir in "${dirs[@]}"; do
if [[ "${dir}" == "${GBPM_OPTS_PATH}/"* ]]; then
dir="${dir%/bin}"
selected+=("${dir##*/}")
fi
done
[[ "${#selected[@]}" -ne 0 ]] || return 1
[[ "${#selected[@]}" -eq 1 ]] \
|| _warn 'warning: multiple managed paths found in PATH'
}
_clear() {
local dir dirs cdirs
mapfile -td : dirs < <(printf %s "${PATH}")
for dir in "${dirs[@]}"; do
if [[ "${dir}" == "${GBPM_OPTS_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:${PATH}"
}
cmd_ls() {
local dir dirs selected str
_populate_dirs
_populate_selected
for dir in "${dirs[@]}"; do
str=" ${dir##*/}"
[[ "${dir##*/}" == "${selected}" ]] && str="${str/ /*}"
_echo "${str}"
done
}
cmd_get() {
local dir selected
_populate_selected || _die 'no managed path found in PATH'
for dir in "${selected[@]}"; do
_echo "${dir}"
done
}
cmd_set() {
[[ -n "${1}" ]] || _die 'set command requires an argument'
local dir dirs match match_start
_populate_dirs
for dir in "${dirs[@]}"; do
[[ "${dir##*/}" == *"${1}"* ]] || continue
match="${dir}"
# exact match
if [[ "${dir##*/}" == "${1}" ]]; then
unset match_start
break
fi
# match from start of version is preferred. we assume the
# version is at the beginning of the directory name or
# immediately following a hyphen. this avoids unintuitive
# behaviour like `2.1' matching `3.2.1' over `2.1.0'.
if [[ "${dir##*/}" == "${1}"* ||
"${dir##*/}" == *-"${1}"* ]]; then
match_start="${dir}"
fi
done
[[ -n "${match}" ]] || _die 'no matching version found'
[[ -n "${match_start}" ]] && match="${match_start}"
_clear
_add "${match}"
_export
}
cmd_clear() {
_clear || _die 'no managed path found in PATH'
_export
}
cmd_version() {
_echo "gbpm ${GBPM_VERSION}"
}
cmd_help() {
_echo 'Usage: gbpm <command> [args]'
_echo
_echo 'Commands:'
_echo ' ls List all available versions'
_echo ' get Display currently selected version'
_echo ' set Select specified version'
_echo ' clear Unselect any selected versions'
_echo ' version Display gbpm version'
}
case "${1}" in
'ls')
cmd_ls ;;
'get')
cmd_get ;;
'set')
cmd_set "${2}" ;;
'clear')
cmd_clear ;;
'version')
cmd_version ;;
*)
cmd_help ;;
esac
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