configure

#!/bin/bash

# get the script root path
SCRIPT_DIR="$( cd $(dirname "${0}") && pwd )"
DOTFILE_DIR=$SCRIPT_DIR/files
DOTFILE_TEMPLATE_DIR=$SCRIPT_DIR/templates
BACKUP_DIR=$HOME/"dotfiles_bak_$(date +%s)"

_show_usage() {
	echo "Usage:" >&2
	echo "	${0} install [name] [email]   # install dotfiles with specified git user config" >&2
	echo "	${0} remove                   # remove all current installed dotfiles" >&2
}

_create_gitconfig() {
	GIT_NAME=$1
	GIT_EMAIL=$2
	echo "Creating .gitconfig with $GIT_NAME $GIT_EMAIL"
	echo -e "$(eval "echo -e \"`<$DOTFILE_TEMPLATE_DIR/.gitconfig`\"")" > $DOTFILE_DIR/.gitconfig
}

_backup_dotfile() {
	if [[ -e $HOME/$1 ]]; then
		if [[ ! -e $BACKUP_DIR ]]; then
			echo "Creating backup dir $BACKUP_DIR"
			mkdir -p $BACKUP_DIR
		fi
		echo "Backup old $1"
		mv $HOME/$1 $BACKUP_DIR/$1
	fi
}

_link_dotfile() {
	echo "Installing $1"
	ln -s $DOTFILE_DIR/$1 $HOME/$1
}

case $1 in
	install)
		if [[ "$#" != "3" ]]; then
			_show_usage
			exit 1
		fi

		pushd $SCRIPT_DIR
		git submodule update --init
		popd

		_create_gitconfig $2 $3

		ls -a $DOTFILE_DIR | while read f; do
			if [[ "$f" != "." && "$f" != ".." ]]; then
				_backup_dotfile $f
			fi
		done

		ls -a $DOTFILE_DIR | while read f; do
			if [[ "$f" != "." && "$f" != ".." ]]; then
				_link_dotfile $f
			fi
		done
		;;
	remove)
		ls -a $DOTFILE_DIR | while read f; do
			if [[ "$f" != "." && "$f" != ".." ]]; then
				_backup_dotfile $f
			fi
		done
		;;
	**)
		_show_usage
		exit 1
		;;
esac