Integrate `tj/n` with `direnv`

direnv-with-n.md

Integrate tj/n with direnv

This gist explains how to setup direnv together with tj/n. When a node version isn't available at the moment the envrc file gets loaded the node version will be downloaded automatically. Happy coding! ☕

• https://github.com/direnv/direnv
• https://github.com/tj/n

Step 1: Install direnv

Use Homebrew to install the direnv tool.

brew install direnv

Copy file direnvrc below into ~/.config/direnv/direnvrc for integrating tj/n.

Tip: You can globally git ignore all .envrc files:

echo ".envrc" >> ~/.gitignore

Step 2: Create .envrc with current node version

# create file
cat <<EOF > .envrc
#!/usr/bin/env bash
# -*- coding: utf-8 -*-

use node $(node -v)
layout node
EOF

# allow file initially
direnv allow

direnvrc

#!/usr/bin/env bash
# -*- coding: utf-8 -*-

export DIRENV_WARN_TIMEOUT=30s

function _exit() {
    if [[ $1 != "" ]]; then
        echo "$1"
    fi

    /bin/kill -INT $$
}

function _viewHelp() {
    local COMMAND=${1}
    local ARGUMENTS=${2}
    local DESCRIPTION=${3}

    echo "$DESCRIPTION"
    echo ""
    echo "  usage:"
    echo "  $ $COMMAND $ARGUMENTS"
    _exit
}

function use_node() {
    local VERSION="$1"

    # display help
    if [[ $VERSION == '' ]]; then
        _viewHelp "use node" "<version>" "Changes the binary path to the given node version using the n version manager."
    fi

    # install if not already installed
    if n bin "$VERSION" >/dev/null; then
        :
    else
        n --quiet "$VERSION"
    fi

    # set node path
    export PATH="$(dirname "$(n bin "$VERSION" | awk '{$1=$1};1')"):$PATH"
}