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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_CMD:='gbpm'}
: ${GBPM_LABEL:='version'}
: ${GBPM_LABEL_PL:="${GBPM_LABEL}s"}
: ${GBPM_PATH:="${HOME}/.pythons"}
_echo() {
echo "echo '${@//\'/\'\\\'\'}'"
}
_export() {
echo "export PATH='${PATH//\'/\'\\\'\'}'"
echo 'hash -r'
}
_warn() {
echo "echo '${GBPM_CMD}: ${@//\'/\'\\\'\'}' >&2"
}
_die() {
[[ -n "${@}" ]] && _warn "${@}"
echo 'false'
exit 1
}
_populate_dirs() {
[[ -d "${GBPM_PATH}" ]] || _die "directory ${GBPM_PATH} does not exist"
mapfile -td $'\0' dirs < <(shopt -s nullglob;
printf '%s\0' "${GBPM_PATH}/"* | sort -zV)
[[ -n "${dirs}" ]] || _die "directory ${GBPM_PATH} is empty"
}
_populate_selected() {
local dir dirs
mapfile -td : dirs < <(printf %s "${PATH}")
selected=()
for dir in "${dirs[@]}"; do
if [[ "${dir}" == "${GBPM_PATH}/"* ]]; then
dir="${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_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 "${dir}"
done
}
cmd_set() {
[[ "${#}" -eq 0 ]] && _die 'set command requires an argument'
local dir dirs bn prefix pri match match_pri
_populate_dirs
for dir in "${dirs[@]}"; do
bn="${dir##*/}"
[[ "${bn}" == *"${1}"* ]] || continue
# lower depth (i.e. fewer hyphens before match) is preferred,
# e.g. `2' matches `python-2.0' over `python-3.0-2'.
#
# priority at the same depth, using `2.1' as an example:
# - from start/hyphen to end (python-2.1)
# - from start/hyphen to hyphen (python-2.1-2)
# - from start/hyphen to dot (python-2.1.3)
# - from start/hyphen (python-2.11)
# - other (python-3.2.1)
#
# at the same priority, the last match (i.e. greatest
# version-sorted string) is used, e.g. `3' matches
# `python-3.14' over `python-3.2'.
prefix="${bn%%${1}*}"
pri="${prefix//[^-]}"
pri="$((${#pri} * 5))"
if [[ "${prefix}" == @(|*-) ]]; then
case "${bn#*${1}}" in
'') ;;
-*) ((pri++)) ;;
.*) ((pri += 2)) ;;
*) ((pri += 3)) ;;
esac
else
((pri += 4))
fi
[[ "${pri}" -le "${match_pri:-${pri}}" ]] || continue
match="${dir}"
match_pri="${pri}"
done
[[ -n "${match}" ]] || _die "no matching ${GBPM_LABEL} found"
_clear
_add "${match}"
_export
}
cmd_clear() {
_clear || _die 'no managed path found in PATH'
_export
}
cmd_version() {
_echo "${GBPM_CMD} ${GBPM_VERSION}"
}
cmd_help() {
_echo "Usage: ${GBPM_CMD} <command> [args]"
_echo
_echo 'Commands:'
_echo " ls List available ${GBPM_LABEL_PL}"
_echo " get Print currently selected ${GBPM_LABEL}"
_echo " set Select specified ${GBPM_LABEL}"
_echo " clear Clear any selected ${GBPM_LABEL_PL}"
_echo " version Print ${GBPM_CMD} version"
}
case "${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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