main() {
  # Use colors, but only if connected to a terminal, and that terminal
  # supports them.
  if which tput >/dev/null 2>&1; then
      ncolors=$(tput colors);
  fi;
  if [ -t 1 ] && [ -n "${ncolors}" ] && [ "${ncolors}" -ge 8 ]; then
    RED="$(tput setaf 1)";
    GREEN="$(tput setaf 2)";
    YELLOW="$(tput setaf 3)";
    BLUE="$(tput setaf 4)";
    BOLD="$(tput bold)";
    NORMAL="$(tput sgr0)";
  else
    RED="";
    GREEN="";
    YELLOW="";
    BLUE="";
    BOLD="";
    NORMAL="";
  fi;

  # Only enable exit-on-error after the non-critical colorization stuff,
  # which may fail on systems lacking tput or terminfo
  set -e

  ZSH_INSTALLED=$(grep /zsh$ /etc/shells | wc -l)
  if [ ! "${ZSH_INSTALLED}" -ge 1 ]; then
    printf "${RED}Error: zsh is not installed!${BLUE} Please install zsh first!${NORMAL}\n";
    exit 1;
  fi;
  unset ZSH_INSTALLED

  # Set Zim directory
  if [ ! -n "${ZIM_DIR}" ]; then
    ZIM_DIR="${ZDOTDIR:-${HOME}}/.zim";
  fi;

  # Check if Zim is already installed
  if [ -d "${ZIM_DIR}" ]; then
    printf "${RED}Error: You already have Zim installed!${NORMAL}\n";
    exit 1;
  fi;

  # Check if other frameworks are installed
  if [ -d "${HOME}/.oh-my-zsh" ]; then
    mv "${HOME}/.oh-my-zsh" "${HOME}/.oh-my-zsh_zimbackup";
    printf "${YELLOW}Oh-My-Zsh detected and backed up to \
    ${HOME}/.oh-my-zsh_zimbackup${NORMAL}\n";
    printf "${BLUE}This is done to prevent framework conflicts.${NORMAL}\n";
  elif [ -d "${HOME}/.zplug" ]; then
    mv "${HOME}/.zplug" "${HOME}/.zplug_zimbackup";
    printf "${YELLOW}Zplug detected and backed up to \
    ${HOME}/.zplug_zimbackup${NORMAL}\n";
    printf "${BLUE}This is done to prevent framework conflicts.${NORMAL}\n";
  elif [ -d "${HOME}/.zprezto" ]; then
    mv "${HOME}/.zprezto" "${HOME}/.zprezto_zimbackup";
    printf "${YELLOW}Prezto detected and backed up to \
    ${HOME}/.zprezto_zimbackup${NORMAL}\n";
    printf "${BLUE}This is done to prevent framework conflicts.${NORMAL}\n";
  else
    : # Do nothing
  fi;

  # Prevent the cloned repository from having insecure permissions.
  umask g-w,o-w

  # Check if git is installed
  hash git >/dev/null 2>&1 || {
    printf "${RED}Error: git is not installed!${NORMAL}\n";
    exit 1;
  }

  # The Windows (MSYS) Git is not compatible with normal use on cygwin
  if [ "${OSTYPE}" = cygwin ]; then
    if git --version | grep msysgit > /dev/null; then
      printf "${RED}Error: Windows/MSYS Git is not supported on Cygwin${NORMAL}\n";
      printf "${RED}Error: Make sure the Cygwin git package is installed and is first on the path${NORMAL}\n";
      exit 1;
    fi;
  fi;

  ZIM_REPO="https://github.com/Eriner/zim.git"
  # Clone the repo, including submodules. `-j8` allows parallel downloading
  env git clone --recursive -j8 "${ZIM_REPO}" "${ZIM_DIR}" &> /dev/null || {
    printf "${RED}Error: git clone of Zim repo failed${NORMAL}\n";
    exit 1;
  }
  unset ZIM_REPO

  unset ZIM_DIR

  # Back-up old zsh dotfiles
  if [ -f "${HOME}/.zshrc" ] || [ -L "${HOME}/.zshrc" ]; then
    printf "${YELLOW}Found ${HOME}/.zshrc!${NORMAL} ${BLUE}Backing up to ${HOME}/.zshrc_zimbackup.${NORMAL}\n";
    mv "${HOME}/.zshrc" "${HOME}/.zshrc_zimbackup";
  fi;
  if [ -f "${HOME}/.zlogin" ] || [ -L "${HOME}/.zlogin" ]; then
    printf "${YELLOW}Found ${HOME}/.zlogin!${NORMAL} ${BLUE}Backing up to ${HOME}/.zlogin_zimbackup${NORMAL}\n";
    mv "${HOME}/.zlogin" "${HOME}/.zlogin_zimbackup";
  fi;

  # Place template files in ${HOME}
  cp -a "${HOME}/.zim/templates/" "${HOME}/"

  # If this user's login shell is not already "zsh", attempt to switch.
  CURRENT_SHELL=$(expr "${SHELL}" : '.*/\(.*\)')
  if [ "${CURRENT_SHELL}" != "zsh" ]; then
    # Auto-change shell if platform provides "chsh" command
    if hash chsh >/dev/null 2>&1; then
      printf "${BLUE}Changing your default shell to zsh!${NORMAL}\n";
      chsh -s $(grep /zsh$ /etc/shells | tail -1);
    # If not, suggest user do so manually.
    else
      printf "${YELLOW}I can't change your shell automatically because this system does not have chsh.${NORMAL}\n";
      printf "${YELLOW}Please manually change your default shell to zsh!${NORMAL}\n";
    fi;
  fi;
  unset CURRENT_SHELL

  Z="${RED}Z${GREEN}"
  printf "${GREEN}   ______    _       _____ __  __                              _               ${NORMAL}\n"
  printf "${GREEN}  |$Z$Z$Z$Z$Z/   | |     |$Z$Z$Z$Z$Z|$Z$Z\/$Z$Z|                            | |${NORMAL}\n"
  printf "${GREEN}     /$Z/ ___| |__     |$Z| |$Z\\$Z$Z/$Z|_ __  _ __ _____   _____  __| |       ${NORMAL}\n"
  printf "${GREEN}    /$Z/ / __| '_ \    |$Z| |$Z|\/|$Z| '_ \| '__/ _ \ \ / / _ \/ _\` |          ${NORMAL}\n"
  printf "${GREEN}   /$Z/__\__ | | | |  _|$Z|_|$Z|  |$Z| |_) | | | (_) \ V |  __| (_| |          ${NORMAL}\n"
  printf "${GREEN}  /$Z$Z$Z$Z$Z|___|_| |_| |$Z$Z$Z$Z$Z|$Z|  |$Z| .__/|_|  \___/ \_/ \___|\__,_|  ${NORMAL}\n"
  printf "${GREEN}                                 | |                                           ${NORMAL}\n"
  printf "${GREEN}                                 |_|                                           ${NORMAL}\n"
  unset Z

  # For archival purposes
  #   ______      _       _____  __  __                                    _ 
  #  |___  /     | |     |_   _||  \/  |                                  | |
  #     / /  ___ | |__     | |  | \  / | _ __   _ __  ___ __   __ ___   __| |
  #    / /  / __|| '_ \    | |  | |\/| || '_ \ | '__|/ _ \\ \ / // _ \ / _` |
  #   / /__ \__ \| | | |  _| |_ | |  | || |_) || |  | (_) |\ V /|  __/| (_| |
  #  /_____||___/|_| |_| |_____||_|  |_|| .__/ |_|   \___/  \_/  \___| \__,_|
  #                                      | |                                  
  #                                      |_|                                  

  # Remind user to copy back old settings
  if [ -f "${HOME}/.zshrc_zimbackup" ] || [ -L "${HOME}/.zshrc_zimbackup" ]; then
    printf "${YELLOW}Please inspect ${HOME}/.zshrc_zimbackup and copy over${NORMAL}\n";
    printf "${YELLOW}wanted settings to ${HOME}/.zshrc${NORMAL}\n";
  fi;
  if [ -f "${HOME}/.zlogin_zimbackup" ] || [ -L "${HOME}/.zlogin_zimbackup" ]; then
    printf "${YELLOW}Please inspect ${HOME}/.zlogin_zimbackup and copy over${NORMAL}\n";
    printf "${YELLOW}wanted settings to ${HOME}/.zlogin${NORMAL}\n";
  fi;

  # Reload zsh
  env zsh
}

main