#!/bin/bash
#
# Build jekyll site and store site files in ./_site
# © 2019 Cotes Chung
# Published under MIT License


CMD="JEKYLL_ENV=production bundle exec jekyll b"
DEST=$(realpath '_site')

help() {
   echo "Usage:"
   echo
   echo "   bash build.sh [options]"
   echo
   echo "Options:"
   echo "   -b, --baseurl <URL>      The site relative url that start with slash, e.g. '/project'"
   echo "   -h, --help               Print the help information"
   echo "   -d, --destination <DIR>  Destination directory (defaults to ./_site)"
}


init() {
  set -eu

  if [[ -d .container ]]; then
    rm -rf .container
  fi

  if [[ -d _site ]]; then
    jekyll clean
  fi

  temp=$(mktemp -d)
  cp -r * $temp
  cp -r .git $temp
  mv $temp .container

}


check_unset() {
  if [[ -z ${1:+unset} ]]
  then
    help
    exit 1
  fi
}


while [[ $# -gt 0 ]]
do
  opt="$1"
  case $opt in
    -b|--baseurl)
      check_unset $2

      if [[ $2 == \/* ]]
      then
        CMD+=" -b $2"
      else
        help
        exit 1
      fi

      shift
      shift
      ;;
    -d|--destination)
      check_unset $2
      DEST=$(realpath $2)
      shift;
      shift;
      ;;
    -h|--help)
      help
      exit 0
      ;;
    *) # unknown option
      help
      exit 1
      ;;
  esac
done


init

cd .container

echo "$ cd $(pwd)"
python _scripts/py/init_all.py

CMD+=" -d ${DEST}"
echo "\$ $CMD"
eval $CMD
echo -e "\nBuild success, the site files placed in '${DEST}'."

if [[ -d ${DEST}/.git ]]; then

  if [[ ! -z $(git -C $DEST status -s) ]]; then
    git -C $DEST add .
    git -C $DEST commit -m "[Automation] Update site files." -q
    echo -e "\nPlease push the changes of '$(realpath $DEST)' to remote master branch.\n"
  fi

fi

cd .. && rm -rf .container