install

#!/bin/sh

# Lucas Oberwager dotfiles install script
# contains code from and inspired by
# https://github.com/twpayne/chezmoi

set -e

FORCE=0
LOG_LEVEL=2
GITHUB_DOWNLOAD=https://github.com/Watt3r/dotfiles.git
INSTALL_DIR=~/.dotfiles

CONFIG="install.conf.yaml"
DOTBOT_DIR="dotbot"

DOTBOT_BIN="bin/dotbot"

usage() {
	this="$1"
	cat <<EOF
${this}: Download Lucas Oberwager's dotfiles

Usage: ${this} [-i installdir] [-l] [-h] [-f]
  -i  Set the installation directory (default is ${INSTALL_DIR}).
  -l  Set the log level (default is ${LOG_LEVEL}).
  -f  Force install, ignore if repo is already up to date
  -h  Show this help message.
EOF
	exit 2
}

check_command() {
    command -v "$1" > /dev/null 2>&1 || { echo >&2 "$1 is required but it's not installed. Aborting."; exit 1; }
}

get_remote_url() {
    git -C "$1" config --get remote.origin.url
}

valid_repo() {
  remote_url=$(get_remote_url "$1")
  if [ "$remote_url" == "$GITHUB_DOWNLOAD" ]; then
      return 0
  else
      return 1
  fi
}

install_xcode_cli() {
    if [ "$(uname)" = "Darwin" ]; then
        if ! xcode-select --print-path &>/dev/null; then
            echo "Xcode CLI tools not found. Installing them..."
            xcode-select --install
            echo "Please continue with the script after the installation is complete."
            exit 1
        fi
    fi
}

log_info() {
	[ 2 -le "${LOG_LEVEL}" ] || return 0
	echo info "$@" 1>&2
}

log_crit() {
	[ 0 -le "${LOG_LEVEL}" ] || return 0
	echo critical "$@" 1>&2
}

parse_args() {
	while getopts "i:l:fh" arg; do case "$arg" in
		i) INSTALL_DIR="${OPTARG}";;
		l) [ "$OPTARG" -ge 0 -a "$OPTARG" -le 2 ] 2>/dev/null && LOG_LEVEL="$OPTARG" || { echo "Error: -l requires an integer argument"; exit 1; };;
		f) FORCE=1;;
		*) usage "$0";;
	esac; done
}

download_dotfiles() {
  if [ ! -d "${INSTALL_DIR}" ]; then
    log_info "Cloning dotfiles repo from ${GITHUB_DOWNLOAD}"
    git clone --recurse-submodules ${GITHUB_DOWNLOAD} ${INSTALL_DIR}
    return 1
  fi

  if ! valid_repo "${INSTALL_DIR}"; then
    log_crit "Directory ${INSTALL_DIR} is not a valid repo, moving it for backup."
    mv -n "${INSTALL_DIR}" "${INSTALL_DIR}-backup"
    log_info "Cloning dotfiles repo from ${GITHUB_DOWNLOAD}"
    git clone --recurse-submodules ${GITHUB_DOWNLOAD} ${INSTALL_DIR}
    return 1
  fi

  git -C "${INSTALL_DIR}" fetch --quiet
  LOCAL_COMMIT=$(git -C "${INSTALL_DIR}" rev-parse HEAD)
  REMOTE_COMMIT=$(git -C "${INSTALL_DIR}" rev-parse @{u})

  if [ "$LOCAL_COMMIT" != "$REMOTE_COMMIT" ] || [ "$FORCE" -ne 0 ]; then
    log_info "Pulling remote changes"
    git -C "${INSTALL_DIR}" pull
    return 1
  fi

  return 0
}

dotbot() {
  cd "${INSTALL_DIR}"
  git -C "${DOTBOT_DIR}" submodule sync --quiet --recursive
  git submodule update --init --recursive "${DOTBOT_DIR}"

  "${INSTALL_DIR}/${DOTBOT_DIR}/${DOTBOT_BIN}" -d "${INSTALL_DIR}" -c "${CONFIG}" "${@}"
}

main() {
  parse_args "$@"
  install_xcode_cli
  check_command git

  if [ "$(whoami)" = "root" ]; then
    log_crit "Do not run as root. Install dotfiles for a specific user."
    exit 1
  fi

  if download_dotfiles ; then
      log_info "Proper dotfiles repo exists and up-to-date. Goodbye."
      exit 0
  fi

  dotbot || (log_crit "Installation failed" && exit 1)
  log_info "Successfully installed."
}

main "$@"