#!/bin/sh

config="${HOME}/.config"
uninstall=1
remove=1
copy=1
link=0

_usage() {
  printf "\n" >&2
  printf "Usage: setup [OPTIONS]\n" >&2
  printf "\n" >&2
  printf "Installs or Uninstalls git configuration files.\n" >&2
  printf "\n" >&2
  printf "Options:\n" >&2
  printf "\t-c | --copy      : Copy the configuration files, instead of creating symlinks.\n" >&2
  printf "\t-h | --help      : Print usage information.\n" >&2
  printf "\t-l | --link      : Create symlinks to the configuration files (Default).\n" >&2
  printf "\t-r | --remove    : Removes the entire ~/.config/git directory.\n" >&2
  printf "\t-u | --uninstall : Uninstalls configuration files.\n" >&2
  printf "\n" >&2
  printf "If called without the uninstall option then it will install the configuration files.\n" >&2
  printf "The copy and link options are ignored if called with the uninstall or remove option.\n" >&2
  printf "\n" >&2
}

_parse_options() {
  arg=
  while ! test -z "$1"; do
    arg="$1"
    case $arg in
      -c | --copy)
        copy=0
        link=1
        shift;;
      -h | --help)
        _usage
        exit;;
      -l | --link)
        copy=1
        link=0
        shift;;
     -r | --remove)
        remove=0
        shift;;
      -u | --uninstall)
        uninstall=0
        shift;;
      *)
        echo "Unknown option $arg" >&2
        shift;;
    esac
  done
}
_make_dirs() {
  if ! test -d "${config}"; then
    mkdir "${config}"
  fi
}

_remove_git() {
  echo "Removing git directory..."
  test -d "${config}/git" && rm -r "${config}/git"
}

_link_git() {
  echo "Linking git configuration..."
  ln -sfv "${PWD}/git" "${config}"
}

_copy_git() {
  echo "Copying git configuration..."
  cp -r "${PWD}/git" "${config}"
}

_install() {
  _make_dirs

  test "$copy" -eq 0 && _copy_git && return "$?"
  test "$link" -eq 0 && _link_git && return "$?"
  echo "Neither link or copy was passed, see --help for usage"
  exit 1
}

#------------------------------- main -------------------------------
main() {
  _parse_options "$@"

  test "$remove" -eq 0 && _remove_git && exit "$?"
  test "$uninstall" -eq 0 && _remove_git && exit "$?"

  _install && exit "$?"
}

main "$@"