Rakefile

#!/usr/bin/env rake
require 'bundler/gem_tasks'
require 'rake/testtask'

Rake::TestTask.new do |t|
  t.libs << 'test'
  t.pattern = 'test/**/*_test.rb'
end

task :default => :test

namespace :whitespace do
  FIND_FILE_BLACKLIST = "find . -type f | grep -v -e '.git/'"

  desc 'Runs all whitespace tasks'
  task :all do
    Rake::Task["whitespace:remove_trailing"].invoke
    Rake::Task["whitespace:covert_to_soft_tabs"].invoke
    Rake::Task["whitespace:remove_blank_lines"].invoke
  end

  desc 'Removes trailing whitespace'
  task :remove_trailing do
    system %{
      echo Removing trailing whitespace
      for f  in `#{FIND_FILE_BLACKLIST}`;
        do cat $f | sed 's/[ \t]*$//' > .whitespace; cp .whitespace $f; rm .whitespace; echo $f;
      done
    }
  end

  desc 'Converts hard-tabs into two-space soft-tabs'
  task :covert_to_soft_tabs do
    system %{
      echo Converting hard-tabs into two-space soft-tabs
      for f in `#{FIND_FILE_BLACKLIST}`;
        do cat $f | sed 's/\t/  /g' > .soft_tabs; cp .soft_tabs $f; rm .soft_tabs; echo $f;
      done
    }
  end

  desc 'Remove consecutive blank lines'
  task :remove_blank_lines do
    system %{
      echo Removing consecutive blank lines
      for f in `#{FIND_FILE_BLACKLIST}`;
        do cat $f | sed '/./,/^$/!d' > .blank_lines; cp .blank_lines $f; rm .blank_lines; echo $f;
      done
    }
  end
end