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prompt_direnv_macos.sh
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prompt_direnv_macos.sh
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#!/usr/bin/env bash
set -euo pipefail
COMM_CACHE="${XDG_CACHE_HOME:-$HOME/Library/Caches}/app.comm"
mkdir -p "$COMM_CACHE"
COMM_DIRENV="$COMM_CACHE/install-direnv"
if command -v direnv >/dev/null || [[ -s "$COMM_DIRENV" ]]; then
# Already using direnv or anwsered no previously. Exit immediately.
exit 0
fi
# Currently, this script only works on macOS as it assumes homebrew usage
if ! [[ "$OSTYPE" == 'darwin'* ]]; then
echo "This script is only meant to be ran on macOS" >&2
exit 1
fi
# Check if in an interactive shell
# `test -t` tests if a file descriptor is open, 0 being stdin
# Normally, a non-interactive shell will not have 0 FD bound
# However, Buildkite still has 0 FD bound, so check if PS1 is empty
if [[ ! -t 0 ]]; then
exit 0
fi
if [[ ! -e "${COMM_DIRENV}" ]]; then
echo "Direnv is a tool which will automatically setup the development environment upon entering the comm/ directory."
read -r \
-p "Would you like to install direnv? [y/N]" \
response
case "$response" in
[yY][eE][sS]|[yY])
echo "1" > "${COMM_DIRENV}"
;;
*)
touch "${COMM_DIRENV}"
exit 1
;;
esac
fi
brew install direnv
# A more recent version of bash is required for nix-direnv to work correctly
# Default version on macOS is bash 3.2. Output taken from '/bin/bash --version'
# shellcheck disable=SC2076
if [[ "$(bash --version)" =~ "GNU bash, version 3.2" ]]; then
brew install bash
fi
# Install the hook for a given shell in the related file.
install_direnv_hook() {
local shell="$1"
local source_file="$2"
# Skip hook installation of shells which don't exist
if ! command -v "$shell" >/dev/null; then
return 0
fi
# If the file already mentions direnv, then hook is likely already installed
if [[ ! -e "$source_file" ]] \
|| ! grep "direnv" "$source_file" >/dev/null; then
# shellcheck disable=SC2016
echo "eval \"\$(direnv hook $shell)\"" >> "$source_file"
fi
}
# ~/.zshenv would be preferred location to install the hook, however, it
# gets sourced before ~/.zprofile for login shells; and since
# Homebrew asks you to install its hook in ~/.zprofile, we need to
# follow the same convention.
install_direnv_hook zsh ~/.zprofile
install_direnv_hook zsh ~/.zshrc
install_direnv_hook bash ~/.bash_profile
install_direnv_hook bash ~/.bashrc

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