require 'rexml/document'

module BuildMaster

class SvnInfo
    attr_reader :path, :repository_root
    
    def initialize(path)
        @path = path
        analyze_entry_file(File.join(path, ".svn", "entries"))
    end
    
    def analyze_entry_file(file)
        xml = REXML::Document.new(File.open(file))
        xml.root.each_element_with_attribute('name', '', 1) do |element|
            @repository_root = element.attributes['repos']
        end
    end
end

class SvnDriver
    include Shell
    
    def SvnDriver::from_path(directory)
        return SvnDriver.new(SvnInfo.new(directory))
    end
    
    def initialize(svn_info, &command_runner)
        @svn_info = svn_info
        if (command_runner)
            @command_runner = command_runner
        else
            @command_runner = Proc.new {|command| run(command)}
        end
    end
    
    def status
        command_for_path('status')
    end
    
    def update
        command_for_path('update')
    end
    
    def commit(comment)
        command_for_path('commit', " -m \"#{comment}\"") 
    end
    
    def tag(tag_name)
        run_command("svn copy #{@svn_info.repository_root}/trunk #{@svn_info.repository_root}/tags/#{tag_name} -m \"ruby buildmaster\"")
    end
    
    def checkout(output)
        run_command("svn checkout #{@svn_info.repository_root}/trunk #{output}")
    end
    
    def command(command)
        command_for_path(command)
    end
    
    private
    
    def command_for_path(svn_command, argument='')
        run_command("svn #{svn_command} #{@svn_info.path}#{argument}")
    end
end

end