instance method scrape

# File railties/lib/commands/plugin.rb, line 724
    def scrape(uri)
      require 'open-uri'
      puts "Scraping #{uri}" if $verbose
      dupes = []
      content = open(uri).each do |line|
        begin
          if line =~ /<a[^>]*href=['"]([^'"]*)['"]/ || line =~ /(svn:\/\/[^<|\n]*)/
            uri = $1
            if uri =~ /^\w+:\/\// && uri =~ /\/plugins\// && uri !~ /\/browser\// && uri !~ /^http:\/\/wiki\.rubyonrails/ && uri !~ /http:\/\/instiki/
              uri = extract_repository_uri(uri)
              yield uri unless dupes.include?(uri) || Repositories.instance.exist?(uri)
              dupes << uri
            end
          end
        rescue
          puts "Problems scraping '#{uri}': #{$!.to_s}"
        end
      end
    end