Reads patterns from the .svnignore file in RAILS_ROOT and ignores them

svn.rake

namespace :svn do
  
  desc 'Reads patterns from the .svnignore file in RAILS_ROOT and ignores them'
  task :ignore => :environment do
    # Set the svnignore filename and define the absolute path to that file
    #
    svnignore_path = File.join(RAILS_ROOT, '.svnignore')
    
    # Ensure the svnignore file exists
    #
    raise "File #{svnignore_path} does not exist!" unless File.exists?(svnignore_path)
    
    # Stores the parsed ignore patters
    #
    ignores = Hash.new { |hash, key| hash[key] = [] }
    
    # Read the patterns from the svn ignore file
    #
    patterns = File.read(svnignore_path).split("\n")
    
    patterns.each do |pattern|
      # Figure out paths
      #
      path = File.join RAILS_ROOT, pattern
      parent = File.dirname(path)
      relative_path = parent == RAILS_ROOT ? '.' : File.join(parent.gsub(File.join(RAILS_ROOT, ''), ''), '')
      
      # Check for ** in path (recursive ignore)
      #
      if relative_path =~ /\*\*\//
        relative_path.gsub!(/\*\*\/.*$/, '')
        relative_path = '.' if relative_path.blank?
        recursive = '-R '
      else
        recursive = ''
      end
      
      ignores[relative_path] << { :pattern => File.basename(pattern), :recursive => recursive }
    end
    
    # Ignore the patterns
    #
    ignores.sort.each do |(relative_path, patterns)|
      if patterns.length == 1
        options = patterns.first[:recursive]
        pattern = "'#{patterns.first[:pattern].gsub(/'/, "\\\\'")}'"
      else
        options = '-F '
        
        # Create a temporary file to store a newline separated list of files to ignore for this relative path
        #
        temp_file = Tempfile.new('svn-ignore-', RAILS_ROOT)
        temp_file.print patterns.map { |configuration| configuration[:pattern] }.join("\n")
        temp_file.flush
        pattern = File.basename(temp_file.path)
      end
      
      command = "svn propset svn:ignore #{options}#{pattern} #{relative_path}"
      # puts command
      system command
    end
  end
  
end