replacer.rb and deleter.rb

From time to time I find myself needing to replace certain strings globally (eg: in a directory tree), or deleting lines based on a match. I find sed extremely annoying and I don’t manage to get around its syntax. So ruby comes in handy!

replacer.rb

exp_search = '<%=launchBean\.getCustomVersion\(\)%>'
exp_replace = '${xsession.info.launchBean.customVersion}'
directory = '**/'
file_mask = '*.jsp'

Dir.glob(directory+file_mask).each do |file|
  File.open(file, 'r+') do |f|
    content = f.read
    if /#{exp_search}/ =~ content
      s = content.gsub(/#{exp_search}/, exp_replace)
      f.rewind
      f.write s
      puts "#{file}: #{content.split(/#{exp_search}/).size-1} matches"
    end
  end
end

deleter.rb

exp_search = 'useBean.*launchBean'
directory = '**/'
file_mask = '*.jsp'

Dir.glob(directory+file_mask).each do |file|
  count = 0
  content = ""
  File.open(file, 'r+') do |f|
    while line = f.gets
      if /#{exp_search}/ =~ line
        count += 1
      else
        content = content << line
      end
    end
  end
  if count > 0
    File.open(file, 'w') do |f|
      f.write content
      puts "#{file}: #{count} lines deleted"
    end
  end
end

These commands are especially useful if you have to refactor a codebase that doesn’t provide direct support with refactoring tools. In this case, I was refactoring a few hundred JSPs of a legacy system.

Credits to RSF & Ruby One-Liners for most of the code & ideas. rcscript seems to be a bit too much for me at this time, I’m perfectly happy modifying replacer.rb and deleter.rb when I need it.