set -e

if [ ! -n "$ZSH" ]; then
  ZSH=~/.oh-my-zsh
fi

if [ -d "$ZSH" ]; then
  echo "\033[0;33mYou already have Oh My Zsh installed.\033[0m You'll need to remove $ZSH if you want to install"
  exit
fi

echo "\033[0;34mCloning Oh My Zsh...\033[0m"
hash git >/dev/null 2>&1 || {
  echo "Error: git is not installed"
  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
    echo "Error: Windows/MSYS Git is not supported on Cygwin"
    echo "Error: Make sure the Cygwin git package is installed and is first on the path"
    exit 1
  fi
fi
env git clone --depth=1 https://github.com/robbyrussell/oh-my-zsh.git $ZSH || {
  echo "Error: git clone of oh-my-zsh repo failed"
  exit 1
}

echo "\033[0;34mLooking for an existing zsh config...\033[0m"
if [ -f ~/.zshrc ] || [ -h ~/.zshrc ]; then
  echo "\033[0;33mFound ~/.zshrc.\033[0m \033[0;32mBacking up to ~/.zshrc.pre-oh-my-zsh\033[0m";
  mv ~/.zshrc ~/.zshrc.pre-oh-my-zsh;
fi

echo "\033[0;34mUsing the Oh My Zsh template file and adding it to ~/.zshrc\033[0m"
cp $ZSH/templates/zshrc.zsh-template ~/.zshrc
sed -i -e "/^export ZSH=/ c\\
export ZSH=$ZSH
" ~/.zshrc

echo "\033[0;34mCopying your current PATH and adding it to the end of ~/.zshrc for you.\033[0m"
sed -i -e "/export PATH=/ c\\
export PATH=\"$PATH\"
" ~/.zshrc

TEST_CURRENT_SHELL=$(expr "$SHELL" : '.*/\(.*\)')
if [ "$TEST_CURRENT_SHELL" != "zsh" ]; then
  if hash chsh >/dev/null 2>&1; then
    echo "\033[0;34mTime to change your default shell to zsh!\033[0m"
    chsh -s $(grep /zsh$ /etc/shells | tail -1)
  else
    echo "I can't change your shell automatically because this system does not have chsh."
    echo "Please edit /etc/passwd to set your default shell to zsh."
  fi
fi
unset TEST_CURRENT_SHELL

echo "\033[0;32m"'         __                                     __   '"\033[0m"
echo "\033[0;32m"'  ____  / /_     ____ ___  __  __   ____  _____/ /_  '"\033[0m"
echo "\033[0;32m"' / __ \/ __ \   / __ `__ \/ / / /  /_  / / ___/ __ \ '"\033[0m"
echo "\033[0;32m"'/ /_/ / / / /  / / / / / / /_/ /    / /_(__  ) / / / '"\033[0m"
echo "\033[0;32m"'\____/_/ /_/  /_/ /_/ /_/\__, /    /___/____/_/ /_/  '"\033[0m"
echo "\033[0;32m"'                        /____/                       ....is now installed!'"\033[0m"
echo "\n\n \033[0;32mPlease look over the ~/.zshrc file to select plugins, themes, and options.\033[0m"
echo "\n\n \033[0;32mp.s. Follow us at http://twitter.com/ohmyzsh.\033[0m"
echo "\n\n \033[0;32mp.p.s. Get stickers and t-shirts at http://shop.planetargon.com.\033[0m"
env zsh
. ~/.zshrc