installer

#!/bin/bash

my_theme_name=gnapple-plymouth-theme
prefix_themes_path=/usr/share/plymouth/themes

my_theme_path=$prefix_themes_path/$my_theme_name

get_setup_help() {
  sed -n '110,118p' $0
  exit 1
}

create_new_initramfs() {
  if type update-initramfs &>/dev/null; then
    update-initramfs -u &>/dev/null  
  elif type mkinitcpio &>/dev/null; then
    mkinitcpio -P &>/dev/null
  else
    echo "Warning: Could not rebuild initramfs!"
    echo "Maybe you should do this manually!"
  fi
}

no_plymouth_exit() {
  if [ ! -d $prefix_themes_path ]; then
    echo "Error: Could not found plymouth!"
    echo "Please install plymouth and try again!"

    exit 1
  fi
}

not_root_exit() {
  if ((UID != 0)); then
    echo "Error: Permissions denied!"
    echo "Please run as root or using sudo command!"

    exit 1
  fi
}

remove_plymouth_theme() {
  if [ -d $my_theme_path ]; then
    echo "Wait for uninstalling complete..."

    if type plymouth-set-default-theme &>/dev/null; then
      plymouth-set-default-theme -r &>/dev/null
    else
      update-alternatives --remove default.plymouth \
        $my_theme_path/$my_theme_name.plymouth &>/dev/null
      create_new_initramfs
    fi

    rm -rf $my_theme_path
    echo "Uninstall success!"
  else
    echo "The $my_theme_name theme never installed!"
    exit 1
  fi
}

install_plymouth_theme() {
  echo "Please wait until installation is complete..."

  cp -r $my_theme_name $prefix_themes_path
  mv $my_theme_path/$my_theme_name.js $my_theme_path/$my_theme_name.script
  sed -i 's/function/fun/g' $my_theme_path/$my_theme_name.script

  if type plymouth-set-default-theme &>/dev/null; then
    plymouth-set-default-theme -R $my_theme_name &>/dev/null
  else
    update-alternatives --install $prefix_themes_path/default.plymouth default.plymouth \
      $my_theme_path/$my_theme_name.plymouth 200 &>/dev/null
    update-alternatives --set default.plymouth \
      $my_theme_path/$my_theme_name.plymouth &>/dev/null

    create_new_initramfs
  fi

  echo "The $my_theme_name theme has been Configured."
  exit 0
}

no_plymouth_exit
not_root_exit

if [[ $1 ]]; then
  case $1 in
    -r*)
      remove_plymouth_theme
      ;;
    -R*)
      remove_plymouth_theme
      install_plymouth_theme
      ;;
    *)
      get_setup_help
      ;;
  esac
else
  install_plymouth_theme
fi

exit 0

usage:
  sudo ./installer [ -r | -R ]

options:
  -r	remove GnApple Plymouth Theme
  -R	reinstall GnApple Plymouth Theme

  no args to install theme
  wrong to show this message