setup_dotfiles.sh

#!/usr/bin/env sh

if [ -z ${BASH_SOURCE} ]; then
  script_dir=$(readlink -f $(dirname "${0}"))
else
  script_dir="$(cd -P "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
fi

script_vimrcpath="${script_dir}"/.vimrc
home_vimrcpath=~/.vimrc
actual_home_vimrcpath=$home_vimrcpath
backup_home_vimrcpath=${home_vimrcpath}.old

which readlink >/dev/null
if [ $? -eq 0 ]; then
  actual_home_vimrcpath=$(readlink -f "${actual_home_vimrcpath}")
fi

if [ ! "${actual_home_vimrcpath}" -ef "${script_vimrcpath}" ]; then

  if [ ! -e ~/.vim/bundle/Vundle.vim ]; then
    echo 'Installing Vundle - https://github.com/VundleVim/Vundle.vim'
    git clone https://github.com/VundleVim/Vundle.vim ~/.vim/bundle/Vundle.vim
  fi

  echo 'Installing Vim plugins'
  echo 'set nocompatible              " be iMproved, required
filetype off                  " required

set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()
  ' > "${script_dir}"/vimrctemp
    if [ -f "${home_vimrcpath}" ]; then
      grep "Plugin '" "${home_vimrcpath}" >> "${script_dir}"/vimrctemp
    else
      grep "Plugin '" "${script_vimrcpath}" >> "${script_dir}"/vimrctemp
    fi
    echo 'call vundle#end()
' >> "${script_dir}"/vimrctemp
 
  vim +PluginInstall +qall -u "${script_dir}"/vimrctemp
 
  rm "${script_dir}"/vimrctemp

  source_line="source ${script_vimrcpath}"
  if [ ! -f "${home_vimrcpath}" -o \( -L "${home_vimrcpath}" -a ! -f "${actual_home_vimrcpath}" \) ]; then
     echo 'Creating new '"${home_vimrcpath}"' file.'
     rm "${home_vimrcpath}" 2>/dev/null
     echo "${source_line}" >"${home_vimrcpath}"
  else
    diff -q "${home_vimrcpath}" "${script_vimrcpath}" >/dev/null
    files_differ=$?
    if [ ${files_differ} -ne 0 ]; then
      grep "${source_line}" "${home_vimrcpath}" >/dev/null
      if [ $? -ne 0 ]; then
        echo 'Backing up .vimrc'
        cp "${home_vimrcpath}" "${backup_home_vimrcpath}"

        echo 'Updating .vimrc'
        echo "${source_line}" | cat - "${backup_home_vimrcpath}" > "${actual_home_vimrcpath}"
      else
        echo 'Your .vimrc appears to source the repository .vimrc file already.'
      fi
    else
      echo 'Your .vimrc file is identical to the one in this git repository.'
      echo 'Replacing it with one that sources this git repository.'
      rm "${home_vimrcpath}"
      echo "${source_line}" >"${home_vimrcpath}"
    fi
  fi
else
  echo '.vimrc already pointing at this git repository.'
fi