RE: [Jython-users] More fun with Readline

[brian z. <bz...@zi...>]

Steve,

I tested isql on my Linux box with the Readline binary from the url you
pointed out earlier and was unable to reproduce the exception.  I see
that cmd.py doesn't work with the Readline console, but I don't get any
exceptions.  I tested this with the latest CVS (2.1+) and Python 2.2
Lib.  In addition, I checked in a new version of isql but I doubt that
would have fixed this.

brian

> -----Original Message-----
> From: Steve Cohen 
> [mailto:jyt...@li...] On Behalf 
> Of Steve Cohen
> Sent: Saturday, January 05, 2002 8:53 AM
> To: Finn Bock; jyt...@li...
> Subject: RE: [Jython-users] More fun with Readline
> 
> 
> There is a stack trace and it's the same whether or not 
> showJavaExceptions is true:
> 
> [scohen@sleepingbear scohen]$ jython 
> -Dpython.options.showJavaExceptions=true
> Jython 2.1 on java1.3.0 (JIT: null)
> Type "copyright", "credits" or "license" for more information.
> >>> import dbexts, isql
> >>> d=dbexts.dbexts("prod_sport")
> >>> D=isql.IsqlCmd(d)
> >>> D.use_rawinput=0
> >>> D.cmdloop()
> Traceback (innermost last):
>   File "<console>", line 1, in ?
>   File "/usr/local/jython/jython-2.1/Lib/cmd.py", line 79, in cmdloop
> TypeError: write(): 1st arg can't be coerced to String
> 
> The 1st arg is None, which is arguably a bug in isql.IsqlCmd. 
>  The code in cmdloop can't handle it (can't coerce it to 
> String).  I can work around the bug by explicitly setting 
> D.prompt (which is the first argument passed in) before 
> executing D.cmdloop() but then you are quite right, there 
> still isn't support for any form of readline, either the 
> java_readline that is in the interactive mode or even the 
> Ctrl-N, Ctrl-P stuff that the documentation speaks of.
> 
> I suppose I could take a look at fixing this, although I'm 
> not extremely familiar with it.  If you could point me to 
> where the java_readline stuff is integrated into the 
> interactive mode, I could have a go at it.  Or, if you'd 
> rather have someone more familiar with the internals do it, I 
> certainly understand.
> 
> 
> -----Original Message-----
> From:	Finn Bock
> Sent:	Sat 1/5/2002 7:44 AM
> To:	jyt...@li...
> Cc:	Steve Cohen
> Subject:	Re: [Jython-users] More fun with Readline
> [Steve Cohen]
> 
> >Now that I have readline working with jython, I come quickly to the 
> >next hurdle.  Is it possible to integrate readline capabilities into 
> >jython-coded command interpreters based on cmd.Cmd?  I 
> cannot get this 
> >to work at all.  The docs on cmd.Cmd gave me some hope, but 
> I can't get 
> >any of it to work, not even the Ctrl-P, Ctrl-N stuff.  I also tried 
> >setting use_rawinput to 0 to force readline, that produced an error 
> >when I executed cmdloop():=20
> >
> >TypeError: write(): 1st arg can't be coerced to String
> 
> Was there a stacktrace with that exception?
> 
> It is not uncommon that TypeErrors are caused by a too 
> restrictive method signature in the jython core, but more 
> information is needed. Also try to start jython with the command:
> 
>    jython -Dpython.options.showJavaExceptions=true
> 
> to get additional stacktrace information.
> 
> >Does anyone have any ideas how readline can be made to work 
> in cmd.Cmd 
> >interpreters?
> 
> I doubt that it works at the moment. raw_input() just call the
> .readline() method on sys.stdin.
> 
> Someone have to add support for readline in __builtin__.raw_input().
> 
> Anyone?
> 
> regards,
> finn
> 
> 
>