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+#!/usr/bin/env bash
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+# -*- coding: utf-8; mode: sh indent-tabs-mode: nil -*-
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+# SPDX-License-Identifier: AGPL-3.0-or-later
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+#
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+# Tools to install and maintain NVM versions manager for Node.js
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+#
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+# [1] https://github.com/nvm-sh/nvm
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+
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+# https://github.com/koalaman/shellcheck/issues/356#issuecomment-853515285
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+# shellcheck source=utils/lib.sh
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+. /dev/null
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+
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+declare main_cmd
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+
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+# configure nvm environment
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+# -------------------------
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+
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+NVM_LOCAL_FOLDER=.nvm
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+
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+[[ -z "${NVM_GIT_URL}" ]] && NVM_GIT_URL="https://github.com/nvm-sh/nvm.git"
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+[[ -z "${NVM_MIN_NODE_VER}" ]] && NVM_MIN_NODE_VER="16.13.0"
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+
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+# initalize nvm environment
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+# -------------------------
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+
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+nvm.env() {
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+ source "${NVM_DIR}/nvm.sh"
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+ source "${NVM_DIR}/bash_completion"
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+}
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+
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+nvm.is_installed() {
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+ # is true if NVM is installed / in $HOME or even in <repo-root>/.nvm
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+ [[ -d "${NVM_DIR}" ]]
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+}
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+
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+if [[ -z "${NVM_DIR}" ]]; then
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+ # nvm is not pre-intalled in $HOME. Prepare for using nvm from <repo-root>
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+ NVM_DIR="$(git rev-parse --show-toplevel)/${NVM_LOCAL_FOLDER}"
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+fi
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+export NVM_DIR
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+
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+if nvm.is_installed; then
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+ [ "$VERBOSE" = "1" ] && info_msg "source NVM environment from ${NVM_DIR}"
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+ nvm.env
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+else
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+ # if nvm is not installed, use this function as a wrapper
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+ nvm() {
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+ nvm.ensure
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+ nvm "$@"
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+ }
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+fi
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+
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+# implement nvm functions
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+# -----------------------
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+
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+nvm.is_local() {
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+ # is true if NVM is installed in <repo-root>/.nvm
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+ [ "${NVM_DIR}" = "$(git rev-parse --show-toplevel)/${NVM_LOCAL_FOLDER}" ]
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+}
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+
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+nvm.min_node(){
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+
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+ # usage: nvm.min_node 16.3.0
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+ #
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+ # Is true if minimal Node.js version is installed.
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+
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+ local min_v
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+ local node_v
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+ local higher_v
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+
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+ if ! command -v node >/dev/null; then
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+ wanr_msg "Node.js is not yet installed"
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+ return 42
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+ fi
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+
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+ min_v="${1}"
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+ node_v="$(node --version)"
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+ node_v="${node_v:1}" # remove 'v' from 'v16.3.0'
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+ if ! [ "${min_v}" = "${node_v}" ]; then
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+ higher_v="$(echo -e "$min_v\n${node_v}" | sort -Vr | head -1)"
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+ if [ "${min_v}" = "${higher_v}" ]; then
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+ return 42
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+ fi
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+ fi
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+}
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+
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+# implement nvm command line
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+# --------------------------
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+
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+nvm.help(){
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+ cat <<EOF
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+nvm.: use nvm (without dot) to execute nvm commands directly
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+ install : install NVM locally at $(git rev-parse --show-toplevel)/${NVM_LOCAL_FOLDER}
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+ clean : remove NVM installation
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+ status : prompt some status informations about nvm & node
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+ nodejs : install Node.js latest LTS
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+ bash : start bash interpreter with NVM environment sourced
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+EOF
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+}
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+
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+nvm.install() {
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+ local NVM_VERSION_TAG
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+ info_msg "install (update) NVM at ${NVM_DIR}"
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+ if [[ -d "${NVM_DIR}" ]] ; then
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+ info_msg "already cloned at: ${NVM_DIR}"
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+ pushd "${NVM_DIR}" &> /dev/null
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+ git fetch --all | prefix_stdout " ${_Yellow}||${_creset} "
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+ else
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+ info_msg "clone: ${NVM_GIT_URL}"
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+ git clone "${NVM_GIT_URL}" "${NVM_DIR}" 2>&1 | prefix_stdout " ${_Yellow}||${_creset} "
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+ pushd "${NVM_DIR}" &> /dev/null
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+ git config --local advice.detachedHead false
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+ fi
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+ NVM_VERSION_TAG="$(git rev-list --tags --max-count=1)"
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+ NVM_VERSION_TAG="$(git describe --abbrev=0 --tags --match "v[0-9]*" "${NVM_VERSION_TAG}")"
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+ info_msg "checkout ${NVM_VERSION_TAG}"
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+ git checkout "${NVM_VERSION_TAG}" 2>&1 | prefix_stdout " ${_Yellow}||${_creset} "
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+ nvm.env
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+}
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+
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+nvm.clean() {
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+ if ! nvm.is_installed; then
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+ info_msg "NVM is not installed"
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+ return 42
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+ fi
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+ if ! nvm.is_local; then
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+ info_msg "can't remove NVM from ${NVM_DIR}"
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+ return 42
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+ fi
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+ rm -rf "${NVM_DIR}"
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+}
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+
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+nvm.status(){
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+ if command -v node >/dev/null; then
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+ info_msg "Node.js is installed at $(command -v node)"
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+ info_msg "Node.js is version $(node --version)"
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+ if ! nvm.min_node "${NVM_MIN_NODE_VER}"; then
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+ warn_msg "minimal Node.js version is ${NVM_MIN_NODE_VER}"
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+ fi
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+ else
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+ warn_msg "Node.js is mot installed"
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+ fi
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+ if command -v npm >/dev/null; then
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+ info_msg "npm is installed at $(command -v npm)"
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+ info_msg "npm is version $(npm --version)"
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+ else
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+ warn_msg "npm is not installed"
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+ fi
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+ if nvm.is_installed; then
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+ info_msg "NVM is installed at ${NVM_DIR}"
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+ else
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+ warn_msg "NVM is not installed"
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+ info_msg "to install NVM and Node.js (LTS) use: ${main_cmd} nvm install --lts"
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+ fi
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+}
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+
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+nvm.nodejs(){
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+ nvm install --lts
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+ nvm.status
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+}
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+
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+nvm.bash() {
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+ nvm.ensure
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+ bash --init-file <(cat "${NVM_DIR}/nvm.sh" "${NVM_DIR}/bash_completion")
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+}
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+
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+nvm.ensure() {
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+ if ! nvm.is_installed; then
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+ nvm.install
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+ fi
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+}
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Markus Heiser