gistfile1.rb

ruby_block 'set P4CONFIG in shell rc file' do
  block do
    content = nil
    File.open(shellrc_path, 'r') do |file|
      content = file.read

      p4config_matcher = 'P4CONFIG=\"[^\"]*\"'
      content.gsub! /^.*#{p4config_matcher}.*$/, set_p4config_line

      content << "\n\n#{set_p4config_line}" unless content =~ /#{p4config_matcher}/
    end

    File.open(shellrc_path, 'w') do |f|
      f.print(content)
    end

  end

  not_if do
    begin
      File.open(shellrc_path) do |file|
        !!(file.readlines.join("\n") =~ /#{set_p4config_line}/)
      end
    rescue Errno::ENOENT
      false
    end
  end