--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cmd2/cmd2.py	Mon Sep 29 12:48:29 2008 -0400
@@ -0,0 +1,677 @@
+"""Variant on standard library's cmd with extra features.
+
+To use, simply import cmd2.Cmd instead of cmd.Cmd; use precisely as though you
+were using the standard library's cmd, while enjoying the extra features.
+
+Searchable command history (commands: "hi", "li", "run")
+Load commands from file, save to file, edit commands in file
+Multi-line commands
+Case-insensitive commands
+Special-character shortcut commands (beyond cmd's "@" and "!")
+Settable environment parameters
+Parsing commands with `optparse` options (flags)
+Redirection to file with >, >>; input from file with <
+
+Note that redirection with > and | will only work if `self.stdout.write()`
+is used in place of `print`.  The standard library's `cmd` module is 
+written to use `self.stdout.write()`, 
+
+- Catherine Devlin, Jan 03 2008 - catherinedevlin.blogspot.com
+
+CHANGES:
+As of 0.3.0, options should be specified as `optparse` options.  See README.txt.
+flagReader.py options are still supported for backward compatibility
+"""
+import cmd, re, os, sys, optparse, subprocess, tempfile, pyparsing, doctest
+from optparse import make_option
+__version__ = '0.3.7'
+
+class OptionParser(optparse.OptionParser):
+    def exit(self, status=0, msg=None):
+        self.values._exit = True
+        if msg:
+            print msg
+
+    def error(self, msg):
+        """error(msg : string)
+
+        Print a usage message incorporating 'msg' to stderr and exit.
+        If you override this in a subclass, it should not return -- it
+        should either exit or raise an exception.
+        """
+        raise
+        
+def options(option_list):
+    def option_setup(func):
+        optionParser = OptionParser()
+        for opt in option_list:
+            optionParser.add_option(opt)
+        optionParser.set_usage("%s [options] arg" % func.__name__.strip('do_'))
+        def newFunc(instance, arg):
+            try:
+                opts, arg = optionParser.parse_args(arg.split())
+                arg = ' '.join(arg)
+            except (optparse.OptionValueError, optparse.BadOptionError,
+                    optparse.OptionError, optparse.AmbiguousOptionError,
+                    optparse.OptionConflictError), e:
+                print e
+                optionParser.print_help()
+                return
+            if hasattr(opts, '_exit'):
+                return None
+            result = func(instance, arg, opts)                            
+            return result
+        newFunc.__doc__ = '%s\n%s' % (func.__doc__, optionParser.format_help())
+        return newFunc
+    return option_setup
+
+class PasteBufferError(EnvironmentError):
+    if sys.platform[:3] == 'win':
+        errmsg = """Redirecting to or from paste buffer requires pywin32
+to be installed on operating system.
+Download from http://sourceforge.net/projects/pywin32/"""
+    else:
+        errmsg = """Redirecting to or from paste buffer requires xclip 
+to be installed on operating system.
+On Debian/Ubuntu, 'sudo apt-get install xclip' will install it."""        
+    def __init__(self):
+        Exception.__init__(self, self.errmsg)
+
+'''check here if functions exist; otherwise, stub out'''
+pastebufferr = """Redirecting to or from paste buffer requires %s
+to be installed on operating system.
+%s"""
+if subprocess.mswindows:
+    try:
+        import win32clipboard
+        def getPasteBuffer():
+            win32clipboard.OpenClipboard(0)
+            try:
+                result = win32clipboard.GetClipboardData()
+            except TypeError:
+                result = ''  #non-text
+            win32clipboard.CloseClipboard()
+            return result            
+        def writeToPasteBuffer(txt):
+            win32clipboard.OpenClipboard(0)
+            win32clipboard.EmptyClipboard()
+            win32clipboard.SetClipboardText(txt)
+            win32clipboard.CloseClipboard()        
+    except ImportError:
+        def getPasteBuffer():
+            raise OSError, pastebufferr % ('pywin32', 'Download from http://sourceforge.net/projects/pywin32/')
+        setPasteBuffer = getPasteBuffer
+else:
+    can_clip = False
+    try:
+        subprocess.check_call('xclip -o -sel clip', shell=True, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
+        can_clip = True
+    except AttributeError:  # check_call not defined, Python < 2.5
+        teststring = 'Testing for presence of xclip.'
+        xclipproc = subprocess.Popen('xclip -sel clip', shell=True, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
+        xclipproc.stdin.write(teststring)
+        xclipproc.stdin.close()
+        xclipproc = subprocess.Popen('xclip -o -sel clip', shell=True, stdout=subprocess.PIPE, stdin=subprocess.PIPE)        
+        if xclipproc.stdout.read() == teststring:
+            can_clip = True
+    except (subprocess.CalledProcessError, OSError, IOError):
+        pass
+    if can_clip:    
+        def getPasteBuffer():
+            xclipproc = subprocess.Popen('xclip -o -sel clip', shell=True, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
+            return xclipproc.stdout.read()
+        def writeToPasteBuffer(txt):
+            xclipproc = subprocess.Popen('xclip -sel clip', shell=True, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
+            xclipproc.stdin.write(txt)
+            xclipproc.stdin.close()
+            # but we want it in both the "primary" and "mouse" clipboards
+            xclipproc = subprocess.Popen('xclip', shell=True, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
+            xclipproc.stdin.write(txt)
+            xclipproc.stdin.close()
+    else:
+        def getPasteBuffer():
+            raise OSError, pastebufferr % ('xclip', 'On Debian/Ubuntu, install with "sudo apt-get install xclip"')
+        setPasteBuffer = getPasteBuffer
+          
+pyparsing.ParserElement.setDefaultWhitespaceChars(' \t')
+def parseSearchResults(pattern, s):
+    generator = pattern.scanString(s)
+    try:
+        result, start, stop = generator.next()
+        result['before'], result['after'] = s[:start], s[stop:]
+        result['upToIncluding'] = s[:stop]
+    except StopIteration:
+        result = pyparsing.ParseResults('')
+        result['before'] = s
+    return result
+        
+class Cmd(cmd.Cmd):
+    caseInsensitive = True
+    multilineCommands = []
+    continuationPrompt = '> '    
+    shortcuts = {'?': 'help', '!': 'shell', '@': 'load'}
+    excludeFromHistory = '''run r list l history hi ed edit li eof'''.split()   
+    defaultExtension = 'txt'
+    defaultFileName = 'command.txt'
+    editor = os.environ.get('EDITOR')
+    _STOP_AND_EXIT = 2
+    if not editor:
+        if sys.platform[:3] == 'win':
+            editor = 'notepad'
+        else:
+            for editor in ['gedit', 'kate', 'vim', 'emacs', 'nano', 'pico']:
+                if not os.system('which %s' % (editor)):
+                    break
+            
+    settable = ['prompt', 'continuationPrompt', 'defaultFileName', 'editor', 'caseInsensitive']
+    _TO_PASTE_BUFFER = 1
+    def do_cmdenvironment(self, args):
+        self.stdout.write("""
+        Commands are %(casesensitive)scase-sensitive.
+        Commands may be terminated with: %(terminators)s
+        Settable parameters: %(settable)s
+        """ % 
+        { 'casesensitive': ('not ' and self.caseInsensitive) or '',
+          'terminators': self.terminatorPattern,
+          'settable': ' '.join(self.settable)
+        })
+        
+    def do_help(self, arg):
+        cmd.Cmd.do_help(self, arg)
+        try:
+            fn = getattr(self, 'do_' + arg)
+            if fn and fn.optionParser:
+                fn.optionParser.print_help(file=self.stdout)
+        except AttributeError:
+            pass
+        
+    def __init__(self, *args, **kwargs):        
+        cmd.Cmd.__init__(self, *args, **kwargs)
+        self.history = History()
+        
+    def do_shortcuts(self, args):
+        """Lists single-key shortcuts available."""
+        result = "\n".join('%s: %s' % (sc[0], sc[1]) for sc in self.shortcuts.items())
+        self.stdout.write("Single-key shortcuts for other commands:\n%s\n" % (result))
+
+    terminatorPattern = ((pyparsing.Literal(';') ^ pyparsing.Literal('\n\n'))
+                  ^ (pyparsing.Literal('\nEOF') + pyparsing.lineEnd))('terminator')
+    argSeparatorPattern = pyparsing.Word(pyparsing.printables)('command') \
+                          + pyparsing.SkipTo(pyparsing.StringEnd())('args')
+    filenamePattern = pyparsing.Word(pyparsing.alphanums + '#$-_~{},.!:\\/')
+    integerPattern = pyparsing.Word(pyparsing.nums).setParseAction( lambda s,l,t: [ int(t[0]) ] )
+    pipePattern = pyparsing.Literal('|')('pipe') + pyparsing.restOfLine('pipeTo')
+    redirectOutPattern = (pyparsing.Literal('>>') ^ '>')('output') \
+                       + pyparsing.Optional(filenamePattern)('outputTo')
+    redirectInPattern = pyparsing.Literal('<')('input') \
+                      + pyparsing.Optional(filenamePattern)('inputFrom')    
+    punctuationPattern = pipePattern ^ redirectInPattern ^ redirectOutPattern
+    for p in (terminatorPattern, pipePattern, redirectInPattern, redirectOutPattern, punctuationPattern):
+        p.ignore(pyparsing.sglQuotedString)
+        p.ignore(pyparsing.dblQuotedString)    
+
+    def parsed(self, s):
+        '''
+        >>> c = Cmd()
+        >>> r = c.parsed('quotes "are > ignored" < inp.txt')
+        >>> r.statement, r.input, r.inputFrom, r.output, r.outputFrom
+        ('quotes "are > ignored" ', '<', 'inp.txt', '', '')
+        >>> r = c.parsed('very complex; < from.txt >> to.txt etc.')
+        >>> r.statement, r.terminator, r.input, r.inputFrom, r.output, r.outputTo
+        ('very complex;', ';', '<', 'from.txt', '>>', 'to.txt')
+        >>> c.parsed('nothing to parse').statement
+        'nothing to parse'
+        >>> r = c.parsed('ignore > within a terminated statement; > out.txt')
+        >>> r.statement, r.terminator, r.input, r.inputFrom, r.output, r.outputTo
+        ('ignore > within a terminated statement;', ';', '', '', '>', 'out.txt')
+        >>> r = c.parsed('send it to | sort | wc')
+        >>> r.statement, r.pipe, r.pipeTo
+        ('send it to ', '|', ' sort | wc')
+        >>> r = c.parsed('got from < thisfile.txt plus blah blah')
+        >>> r.statement, r.input, r.inputFrom
+        ('got from ', '<', 'thisfile.txt')
+        '''
+        if isinstance(s, pyparsing.ParseResults):
+            return s
+        result = (pyparsing.SkipTo(pyparsing.StringEnd()))('fullStatement').parseString(s)
+        if s[0] in self.shortcuts:
+            s = self.shortcuts[s[0]] + ' ' + s[1:]
+        result['statement'] = s
+        result['parseable'] = s
+        result += parseSearchResults(self.terminatorPattern, s)
+        if result.terminator:
+            result['statement'] = result.upToIncluding
+            result['unterminated'] = result.before
+            result['parseable'] = result.after
+        else:
+            result += parseSearchResults(self.punctuationPattern, s)
+            result['statement'] = result['unterminated'] = result.before
+        result += parseSearchResults(self.pipePattern, result.parseable)
+        result += parseSearchResults(self.redirectInPattern, result.parseable)
+        result += parseSearchResults(self.redirectOutPattern, result.parseable)            
+        result += parseSearchResults(self.argSeparatorPattern, result.statement)
+        if self.caseInsensitive:
+            result['command'] = result.command.lower()
+        result['statement'] = '%s %s' % (result.command, result.args)
+        return result
+        
+    def extractCommand(self, statement):
+        try:
+            (command, args) = statement.split(None,1)
+        except ValueError:
+            (command, args) = statement, ''
+        if self.caseInsensitive:
+            command = command.lower()
+        return command, args
+       
+    def onecmd(self, line, assumeComplete=False):
+        """Interpret the argument as though it had been typed in response
+        to the prompt.
+
+        This may be overridden, but should not normally need to be;
+        see the precmd() and postcmd() methods for useful execution hooks.
+        The return value is a flag indicating whether interpretation of
+        commands by the interpreter should stop.
+
+        """
+        line = line.strip()
+        if not line:
+            return
+        statement = self.parsed(line)
+        while (statement.command in self.multilineCommands) and not \
+              (statement.terminator or assumeComplete):
+            statement = self.parsed('%s\n%s' % (statement.fullStatement, 
+                                    self.pseudo_raw_input(self.continuationPrompt)))
+
+        statekeeper = None
+        stop = 0
+        if statement.input:
+            if statement.inputFrom:
+                try:
+                    newinput = open(statement.inputFrom, 'r').read()
+                except OSError, e:
+                    print e
+                    return 0
+            else:
+                newinput = getPasteBuffer()
+            start, end = self.redirectInPattern.scanString(statement.fullStatement).next()[1:]
+            return self.onecmd('%s%s%s' % (statement.fullStatement[:start], 
+                                newinput, statement.fullStatement[end:]))
+        if statement.pipe and statement.pipeTo:
+            redirect = subprocess.Popen(statement.pipeTo, shell=True, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
+            statekeeper = Statekeeper(self, ('stdout',))   
+            self.stdout = redirect.stdin
+        elif statement.output:
+            statekeeper = Statekeeper(self, ('stdout',))            
+            if statement.outputTo:
+                mode = 'w'
+                if statement.output == '>>':
+                    mode = 'a'
+                try:
+                    self.stdout = open(statement.outputTo, mode)                            
+                except OSError, e:
+                    print e
+                    return 0                    
+            else:
+                statekeeper = Statekeeper(self, ('stdout',))
+                self.stdout = tempfile.TemporaryFile()
+                if statement.output == '>>':
+                    self.stdout.write(getPasteBuffer())
+        stop = cmd.Cmd.onecmd(self, statement.statement)
+        try:
+            if statement.command not in self.excludeFromHistory:
+                self.history.append(statement.fullStatement)
+        finally:
+            if statekeeper:
+                if statement.output and not statement.outputTo:
+                    self.stdout.seek(0)
+                    writeToPasteBuffer(self.stdout.read())
+                elif statement.pipe:
+                    for result in redirect.communicate():              
+                        statekeeper.stdout.write(result or '')                        
+                self.stdout.close()
+                statekeeper.restore()
+                                 
+            return stop        
+        
+    def pseudo_raw_input(self, prompt):
+        """copied from cmd's cmdloop; like raw_input, but accounts for changed stdin, stdout"""
+        
+        if self.use_rawinput:
+            try:
+                line = raw_input(prompt)
+            except EOFError:
+                line = 'EOF'
+        else:
+            self.stdout.write(prompt)
+            self.stdout.flush()
+            line = self.stdin.readline()
+            if not len(line):
+                line = 'EOF'
+            else:
+                if line[-1] == '\n': # this was always true in Cmd
+                    line = line[:-1] 
+        return line
+                          
+    def cmdloop(self, intro=None):
+        """Repeatedly issue a prompt, accept input, parse an initial prefix
+        off the received input, and dispatch to action methods, passing them
+        the remainder of the line as argument.
+        """
+
+        # An almost perfect copy from Cmd; however, the pseudo_raw_input portion
+        # has been split out so that it can be called separately
+        
+        self.preloop()
+        if self.use_rawinput and self.completekey:
+            try:
+                import readline
+                self.old_completer = readline.get_completer()
+                readline.set_completer(self.complete)
+                readline.parse_and_bind(self.completekey+": complete")
+            except ImportError:
+                pass
+        try:
+            if intro is not None:
+                self.intro = intro
+            if self.intro:
+                self.stdout.write(str(self.intro)+"\n")
+            stop = None
+            while not stop:
+                if self.cmdqueue:
+                    line = self.cmdqueue.pop(0)
+                else:
+                    line = self.pseudo_raw_input(self.prompt)
+                line = self.precmd(line)
+                stop = self.onecmd(line)
+                stop = self.postcmd(stop, line)
+            self.postloop()
+        finally:
+            if self.use_rawinput and self.completekey:
+                try:
+                    import readline
+                    readline.set_completer(self.old_completer)
+                except ImportError:
+                    pass    
+            return stop
+
+    def do_EOF(self, arg):
+        return True
+    do_eof = do_EOF
+               
+    def clean(self, s):
+        """cleans up a string"""
+        if self.caseInsensitive:
+            return s.strip().lower()
+        return s.strip()
+    
+    def showParam(self, param):
+        param = self.clean(param)
+        if param in self.settable:
+            val = getattr(self, param)
+            self.stdout.write('%s: %s\n' % (param, str(getattr(self, param))))
+
+    def do_quit(self, arg):
+        return self._STOP_AND_EXIT
+    do_exit = do_quit
+    do_q = do_quit
+    
+    def do_show(self, arg):
+        'Shows value of a parameter'
+        if arg.strip():
+            self.showParam(arg)
+        else:
+            for param in self.settable:
+                self.showParam(param)
+    
+    def do_set(self, arg):
+        'Sets a parameter'        
+        try:
+            paramName, val = arg.split(None, 1)
+            paramName = self.clean(paramName)
+            if paramName not in self.settable:
+                raise NotSettableError                            
+            currentVal = getattr(self, paramName)
+            val = cast(currentVal, self.parsed(val).unterminated)
+            setattr(self, paramName, val)
+            self.stdout.write('%s - was: %s\nnow: %s\n' % (paramName, currentVal, val))
+        except (ValueError, AttributeError, NotSettableError), e:
+            self.do_show(arg)
+                
+    def do_shell(self, arg):
+        'execute a command as if at the OS prompt.'
+        os.system(arg)
+        
+    def do_history(self, arg):
+        """history [arg]: lists past commands issued
+        
+        no arg -> list all
+        arg is integer -> list one history item, by index
+        arg is string -> string search
+        arg is /enclosed in forward-slashes/ -> regular expression search
+        """
+        if arg:
+            history = self.history.get(arg)
+        else:
+            history = self.history
+        for hi in history:
+            self.stdout.write(hi.pr())
+    def last_matching(self, arg):
+        try:
+            if arg:
+                return self.history.get(arg)[-1]
+            else:
+                return self.history[-1]
+        except:
+            return None        
+    def do_list(self, arg):
+        """list [arg]: lists last command issued
+        
+        no arg -> list absolute last
+        arg is integer -> list one history item, by index
+        - arg, arg - (integer) -> list up to or after #arg
+        arg is string -> list last command matching string search
+        arg is /enclosed in forward-slashes/ -> regular expression search
+        """
+        try:
+            self.stdout.write(self.last_matching(arg).pr())
+        except:
+            pass
+    do_hi = do_history
+    do_l = do_list
+    do_li = do_list
+        
+    def do_ed(self, arg):
+        """ed: edit most recent command in text editor
+        ed [N]: edit numbered command from history
+        ed [filename]: edit specified file name
+        
+        commands are run after editor is closed.
+        "set edit (program-name)" or set  EDITOR environment variable
+        to control which editing program is used."""
+        if not self.editor:
+            print "please use 'set editor' to specify your text editing program of choice."
+            return
+        filename = self.defaultFileName
+        buffer = ''
+        try:
+            arg = int(arg)
+            buffer = self.last_matching(arg)
+        except:
+            if arg:
+                filename = arg
+            else:
+                buffer = self.last_matching(arg)
+
+        if buffer:
+            f = open(filename, 'w')
+            f.write(buffer or '')
+            f.close()        
+                
+        os.system('%s %s' % (self.editor, filename))
+        self.do__load(filename)
+    do_edit = do_ed
+    
+    saveparser = (pyparsing.Optional(pyparsing.Word(pyparsing.nums)^'*')("idx") + 
+                  pyparsing.Optional(pyparsing.Word(pyparsing.printables))("fname") +
+                  pyparsing.stringEnd)    
+    def do_save(self, arg):
+        """`save [N] [filename.ext]`
+        Saves command from history to file.
+        N => Number of command (from history), or `*`; 
+             most recent command if omitted"""
+
+        try:
+            args = self.saveparser.parseString(arg)
+        except pyparsing.ParseException:
+            print self.do_save.__doc__
+            return
+        fname = args.fname or self.defaultFileName
+        if args.idx == '*':
+            saveme = '\n\n'.join(self.history[:])
+        elif args.idx:
+            saveme = self.history[int(args.idx)-1]
+        else:
+            saveme = self.history[-1]
+        try:
+            f = open(fname, 'w')
+            f.write(saveme)
+            f.close()
+            print 'Saved to %s' % (fname)
+        except Exception, e:
+            print 'Error saving %s: %s' % (fname, str(e))
+            
+    def do_load(self, fname=None):
+        """Runs command(s) from a file."""
+        if fname is None:
+            fname = self.defaultFileName        
+        keepstate = Statekeeper(self, ('stdin','use_rawinput','prompt','continuationPrompt'))
+        if isinstance(fname, file):
+            self.stdin = fname
+        else:           
+            try:
+                self.stdin = open(fname, 'r')
+            except IOError, e:
+                try:
+                    self.stdin = open('%s.%s' % (fname, self.defaultExtension), 'r')
+                except IOError:
+                    print 'Problem opening file %s: \n%s' % (fname, e)
+                    keepstate.restore()
+                    return
+        self.use_rawinput = False
+        self.prompt = self.continuationPrompt = ''
+        stop = self.cmdloop()
+        self.stdin.close()
+        keepstate.restore()
+        self.lastcmd = ''
+        return (stop == self._STOP_AND_EXIT) and self._STOP_AND_EXIT    
+    do__load = do_load  # avoid an unfortunate legacy use of do_load from sqlpython
+    
+    def do_run(self, arg):
+        """run [arg]: re-runs an earlier command
+        
+        no arg -> run most recent command
+        arg is integer -> run one history item, by index
+        arg is string -> run most recent command by string search
+        arg is /enclosed in forward-slashes/ -> run most recent by regex
+        """        
+        'run [N]: runs the SQL that was run N commands ago'
+        runme = self.last_matching(arg)
+        print runme
+        if runme:
+            runme = self.precmd(runme)
+            stop = self.onecmd(runme)
+            stop = self.postcmd(stop, runme)
+    do_r = do_run        
+            
+    def fileimport(self, statement, source):
+        try:
+            f = open(source)
+        except IOError:
+            self.stdout.write("Couldn't read from file %s\n" % source)
+            return ''
+        data = f.read()
+        f.close()
+        return data
+            
+class HistoryItem(str):
+    def __init__(self, instr):
+        str.__init__(self, instr)
+        self.lowercase = self.lower()
+        self.idx = None
+    def pr(self):
+        return '-------------------------[%d]\n%s\n' % (self.idx, str(self))
+        
+class History(list):
+    rangeFrom = re.compile(r'^([\d])+\s*\-$')
+    def append(self, new):
+        new = HistoryItem(new)
+        list.append(self, new)
+        new.idx = len(self)
+    def extend(self, new):
+        for n in new:
+            self.append(n)
+    def get(self, getme):
+        try:
+            getme = int(getme)
+            if getme < 0:
+                return self[:(-1 * getme)]
+            else:
+                return [self[getme-1]]
+        except IndexError:
+            return []
+        except (ValueError, TypeError):
+            getme = getme.strip()
+            mtch = self.rangeFrom.search(getme)
+            if mtch:
+                return self[(int(mtch.group(1))-1):]
+            if getme.startswith(r'/') and getme.endswith(r'/'):
+                finder = re.compile(getme[1:-1], re.DOTALL | re.MULTILINE | re.IGNORECASE)
+                def isin(hi):
+                    return finder.search(hi)
+            else:
+                def isin(hi):
+                    return (getme.lower() in hi.lowercase)
+            return [itm for itm in self if isin(itm)]
+
+class NotSettableError(Exception):
+    pass
+        
+def cast(current, new):
+    """Tries to force a new value into the same type as the current."""
+    typ = type(current)
+    if typ == bool:
+        try:
+            return bool(int(new))
+        except ValueError, TypeError:
+            pass
+        try:
+            new = new.lower()    
+        except:
+            pass
+        if (new=='on') or (new[0] in ('y','t')):
+            return True
+        if (new=='off') or (new[0] in ('n','f')):
+            return False
+    else:
+        try:
+            return typ(new)
+        except:
+            pass
+    print "Problem setting parameter (now %s) to %s; incorrect type?" % (current, new)
+    return current
+        
+class Statekeeper(object):
+    def __init__(self, obj, attribs):
+        self.obj = obj
+        self.attribs = attribs
+        self.save()
+    def save(self):
+        for attrib in self.attribs:
+            setattr(self, attrib, getattr(self.obj, attrib))
+    def restore(self):
+        for attrib in self.attribs:
+            setattr(self.obj, attrib, getattr(self, attrib))        
+
+if __name__ == '__main__':
+    doctest.testmod()