install.rb

def replace_file(file)
  system %Q{rm -rf "#{file}"}
  system %Q{mv "#{Dir.home}/.#{file}" "#{Dir.pwd}/#{file}"}
  system %Q{ln -s "#{Dir.pwd}/#{file}" "#{Dir.home}/.#{file}"}
end

def link_file(file)
  puts "linking ~/.#{file}"
  system %Q{ln -s "#{Dir.pwd}/#{file}" "#{Dir.home}/.#{file}"}
end

def same?(file)
  in_home = "#{Dir.home}/.#{file}"
  in_repo = "#{Dir.pwd}/#{file}"
  File.symlink?(in_home) and File.readlink(in_home).eql?(in_repo)
end

puts "Installing the dot files into user's home directory"

replace_all = false
Dir['*'].each do |file|
  next if %w[install.rb README.md macos.md Sublime Brewfile].include? file

  if File.exist? "#{Dir.home}/.#{file}"
    if same? file
      puts "identical ~/.#{file}"
    elsif replace_all
      replace_file(file)
    else
      print "overwrite #{file} with ~/.#{file}? [ynaqu] "
      case $stdin.gets.chomp
      when 'a'
        replace_all = true
        replace_file(file)
      when 'y'
        replace_file(file)
      when 'n'
        puts "skipping ~/.#{file}"
        next
      when 'q'
        exit
      when 'u'
        puts "updating repo with ~/.#{file}"
        system %Q{cp "#{Dir.pwd}/#{file}" "#{Dir.home}/.#{file}"}
        replace_file(file)
      else
        puts "I don't understand that option"
        redo
      end
    end
  else
    link_file(file)
  end
end