bootstrap.sh

#!/usr/bin/env bash

# Exit on error
set -e

# Source global variables
if [ -f ".vars" ]; then
	. ./.vars
fi

# see: https://stackoverflow.com/questions/3572030/bash-script-absolute-path-with-os-x#comment64141768_3572030
function abspath() {
	cd "$(dirname -- "$1")"
	pwd -P
}

DOTFILES=$(abspath "$(dirname -- "$0")")
DRY_RUN=false

function templatize() {
	local template
	template="$(abspath "${BASH_SOURCE[1]}")/$1"

	eval "cat <<EOF
$(<"$template")
EOF
" 2>/dev/null
}

function link_file() {
	local from
	from=$(abspath "${BASH_SOURCE[1]}")/$1
	local to=$2
	printf "Linking '%s' to '%s'\n" "$from" "$to"

	if [ ! -d "$(dirname -- "$to")" ]; then
		mkdir -p "$(dirname -- "$to")"
	fi

	if ! $DRY_RUN; then
		ln -sf "$from" "$to"
	fi
}

function insert_line() {
	local query=$1
	local line=$2
	local file=$3
	printf "Inserting '%s' into '%s'\n" "$line" "$file"
	if ! $DRY_RUN; then
		grep -q "$query" "$file" || echo "$line" >>"$file"
	fi
}

function command_exist() {
	command -v "$1" >/dev/null 2>&1
}

function require() {
	local cmd=$1
	command_exist "$cmd" || (printf "Command '%s' not found\n" "$cmd" && false)
}

function _install() {
	if ! $DRY_RUN; then
		echo "Installing/updating dotfiles..."
	else
		echo "Dry run, not installing/updating dotfiles..."
	fi
	echo

	for src in "$DOTFILES"/*/; do
		local src=${src%*/}
		local install="$src/install.sh"
		if [ -f "$install" ]; then
			echo "===== Installing" "$src" "dotfiles..."
			# shellcheck source=/dev/null
			. "$install"
			echo
		fi

		case "$OSTYPE" in
		darwin*)
			local install="$src/install_darwin.sh"
			if [ -f "$install" ]; then
				echo "===== Installing" "$src" "dotfiles for darwin..."
				# shellcheck source=/dev/null
				. "$install"
				echo
			fi
			;;
		linux*)
			local install="$src/install_linux.sh"
			if [ -f "$install" ]; then
				echo "===== Installing" "$src" "dotfiles for linux..."
				# shellcheck source=/dev/null
				. "$install"
				echo
			fi
			;;
		esac
	done

	echo "Done installing/updating dotfiles"
	echo
}

function _usage() {
	echo "Usage: $0 [options] [command]"
	echo
	echo "Commands:"
	echo "  install   Install dotfiles"
	echo "  help      Show this help message and exit"
	if [ -d "$DOTFILES/scripts" ]; then
		for s in "$DOTFILES"/scripts/*.sh; do
			local s=${s%*/}
			local s=${s##*/}
			local s=${s%.sh}
			echo "  $s"
		done
	fi
	echo
	echo "Options:"
	echo "  -h        Show this help message and exit"
	echo "  -d        Dry run"
}

function _main() {
	while getopts ":hd" opt; do
		case $opt in
		h)
			_usage
			exit 0
			;;
		d)
			DRY_RUN=true
			;;
		\?)
			echo "Invalid option: -$OPTARG" >&2
			_usage
			exit 1
			;;
		esac
	done

	shift $((OPTIND - 1))

	local cmd=$1
	case $cmd in
	install)
		_install
		;;
	help)
		_usage
		;;
	*)
		if [ -n "$cmd" ]; then
			if [ -f "$DOTFILES/scripts/$cmd.sh" ]; then
				# shellcheck source=/dev/null
				. "$DOTFILES/scripts/$cmd.sh"
				exit 0
			fi
			echo "Invalid command: $cmd" >&2
		fi
		_usage
		exit 1
		;;
	esac
}

_main "$@"