dot_installer.rb

require 'erb'

class DotInstaller
  class << self
    def install!
      replace_all = false
      shell_scripts = Dir['*.sh']
      ruby_scripts = Dir['*.rb']
      json_files = Dir['*.json']
      markdown_files = Dir['*.md']
      hide_files = Dir['*.hide']
      ignore_these_files = %w[
        duti
        LICENSE
        install.rb
      ]
      ignore_these_dirs = %w[
        bin
        languages
        tmp
      ]
      exclude_list = shell_scripts +
                     ruby_scripts +
                     json_files +
                     markdown_files +
                     hide_files +
                     ignore_these_files +
                     ignore_these_dirs

      Dir['*'].each do |file|
        next if exclude_list.include? file

        if replace_all
          replace_file(file)
        else
          if File.exist?(File.join(ENV['HOME'], ".#{file.sub('.erb', '')}"))
            if File.identical? file, File.join(ENV['HOME'], ".#{file.sub('.erb', '')}")
              puts "identical ~/.#{file.sub('.erb', '')}"
            else
              print "overwrite ~/.#{file.sub('.erb', '')}? [ynaq] "
              case $stdin.gets.chomp
              when 'a'
                replace_all = true
                replace_file(file)
              when 'y'
                replace_file(file)
              when 'q'
                exit
              else
                puts "skipping ~/.#{file.sub('.erb', '')}"
              end
            end
          else
            link_file(file)
          end
        end
      end
    end

    def replace_file(file)
      puts "$HOME/.#{file.sub('.erb', '')}"
      system %x{rm -rf "$HOME/.#{file.sub('.erb', '')}"}
      link_file(file)
    end

    def link_file(file)
      if file =~ /.erb$/
        puts "generating ~/.#{file.sub('.erb', '')}"
        File.open(File.join(ENV['HOME'], ".#{file.sub('.erb', '')}"), 'w') do |new_file|
          new_file.write ERB.new(File.read(file)).result(binding)
        end
      else
        puts "linking ~/.#{file}"
        system %Q{ln -s "$PWD/#{file}" "$HOME/.#{file}"}
      end
    end
  end
end