bootstrap

#!/usr/bin/env bash
set -euo pipefail

REPO_ROOT=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
EXPECTED_REPO_ROOT="$HOME/code/laulauland/dotfiles"
OPERATING_SYSTEM=$(uname)
CHANGE_SHELL=0

if [ "$REPO_ROOT" != "$EXPECTED_REPO_ROOT" ]; then
	echo "This checkout must be at $EXPECTED_REPO_ROOT (found $REPO_ROOT)."
	exit 1
fi

while [ $# -gt 0 ]; do
	case "$1" in
	--defaults)
		# mise bootstrap applies [bootstrap.macos.*] defaults by default now.
		shift
		;;
	--fish-shell)
		CHANGE_SHELL=1
		shift
		;;
	*)
		break
		;;
	esac
done

install_homebrew() {
	if command -v brew >/dev/null 2>&1; then
		eval "$(brew shellenv)"
		return
	fi

	echo "Homebrew install needs sudo once to create system directories."
	sudo -v
	echo "Installing Homebrew..."
	NONINTERACTIVE=1 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
	eval "$(/opt/homebrew/bin/brew shellenv 2>/dev/null || /usr/local/bin/brew shellenv)"
}

install_mise() {
	command -v mise >/dev/null 2>&1 && return
	echo "Installing mise..."
	brew install mise
}

is_arch() {
	[ -r /etc/os-release ] && grep -q '^ID=arch$' /etc/os-release
}

install_arch_base() {
	command -v mise >/dev/null 2>&1 && return
	if ! command -v pacman >/dev/null 2>&1; then
		echo "pacman is required for Arch bootstrap."
		exit 1
	fi

	echo "Installing the Arch bootstrap prerequisite..."
	sudo pacman -Syu --needed --noconfirm mise
}

install_global_mise_config() {
	local environment=$1
	mkdir -p "$HOME/.config/mise"
	ln -sf "$REPO_ROOT/shared/.config/mise/config.toml" "$HOME/.config/mise/config.toml"
	ln -sf "$REPO_ROOT/shared/.config/mise/config.$environment.toml" "$HOME/.config/mise/config.$environment.toml"
	mise trust "$HOME/.config/mise/config.toml"
	mise trust "$HOME/.config/mise/config.$environment.toml"
}

set_fish_shell() {
	local fish_path
	fish_path=$(command -v fish)

	[ "$SHELL" = "$fish_path" ] && return
	if ! grep -qxF "$fish_path" /etc/shells; then
		echo "Adding $fish_path to /etc/shells"
		echo "$fish_path" | sudo tee -a /etc/shells >/dev/null
	fi

	echo "Changing login shell to $fish_path"
	chsh -s "$fish_path"
}

case "$OPERATING_SYSTEM" in
Darwin)
	install_homebrew
	install_mise
	install_global_mise_config macos
	# This checkout already exists, so let mise converge everything except cloning it.
	mise bootstrap --yes -E macos --skip repos "$@"
	[ "$CHANGE_SHELL" -eq 0 ] || set_fish_shell
	;;
Linux)
	if ! is_arch; then
		echo "Only Arch Linux is supported by this bootstrap path."
		exit 1
	fi
	if [ "$(id -u)" -eq 0 ]; then
		echo "Run this as the target user, not root."
		exit 1
	fi

	install_arch_base
	install_global_mise_config arch
	# Complete system packages and interactive GitHub/AUR setup first. Starting a
	# fresh mise process afterwards ensures tool resolution sees the new gh token.
	mise bootstrap --raw --yes -E arch --only packages
	mise bootstrap --raw --yes -E arch --skip packages,repos,macos-defaults,macos-launchd-agents "$@"
	;;
*)
	echo "Your operating system is not supported."
	exit 1
	;;
esac