#!/bin/bash --posix

set -e

DIRECTORY="/usr/local/share/nano"

usage() {
  printf "%s\n" "Usage: bash Install-Nano.bash -d <path>
  --directory <dir> | -d <dir>
    Explanation:
      The directory to install the nano syntax highlighting files to
    Default:
      /usr/local/share/nano/
    Example:
      --syntax-directory ~/.nano/

    Requires two things:
      - Directory names \"Nano-Syntax-Highlighting\" that contains .nanorc files
      - File \".nanorc\" that contains configuration settings for nano"

}

error() {
  printf "\n%s\n" "$1" >&2
  exit 1
}

confirmation() {
  while true; do
    read -p "${1}" -n 1 -r choice
    case "$choice" in
      y | Y) return 1 ;;
      n | N) return 0 ;;
      *) echo -e "\nInput must be either y, Y, n, or N" ;;
    esac
  done
}

while :; do
  case $1 in
    -h | -\? | --help)
      usage # Display a usage synopsis.
      exit
      ;;
    --) # End of all options.
      shift
      break
      ;;
    -d | --directory)
      shift
      DIRECTORY="${1}"
      ;;
    -?*)
      printf 'Unknown option: %s\n' "$1" >&2
      usage
      error
      ;;
    *) # Default case: No more options, so break out of the loop.
      break ;;
  esac

  shift
done

[[ "${DIRECTORY}" == "" ]] && error "A directory was not provided!"
[[ ! -d "${DIRECTORY}" ]] && error "The directory \"${DIRECTORY}\" does not exist"

[[ ! -w "${DIRECTORY}" ]] && error "You lack permissions to write to \"${DIRECTORY}\""

[[ $(confirmation "Copying *.nanorc files to ${DIRECTORY}, continue (y/N)? ") ]] && exit 1

echo ""
echo "It is recommended to update to Nano version 5 if you have not yet... see https://www.nano-editor.org/download.php"
sleep 3;

echo "Copying syntax files to ${DIRECTORY}"
cp -R "Nano-Syntax-Highlighting"/* "${DIRECTORY}"

NANORC_CONTENT="$(cat ./.nanorc)"

cat << EOF > ~/.nanorc
${NANORC_CONTENT}
include ${DIRECTORY}/*.nanorc
EOF

mkdir -p ~/Nano-Backups

echo "Successfully installed custom nanorc, see ~/.nanorc"