Re: [Jython-users] More fun with Readline

[<bc...@wo...>]

[Steve Cohen]

>There is a stack trace and it's the same whether or not
>showJavaExceptions is true:

That is OK. Thanks.

>[scohen@sleepingbear scohen]$ jython
>-Dpython.options.showJavaExceptions=3Dtrue
>Jython 2.1 on java1.3.0 (JIT: null)
>Type "copyright", "credits" or "license" for more information.
>>>> import dbexts, isql
>>>> d=3Ddbexts.dbexts("prod_sport")
>>>> D=3Disql.IsqlCmd(d)
>>>> D.use_rawinput=3D0
>>>> 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

Not quite the error situation that I expected, but that just goes to
show how important the context is. I have added a bug report about the
situation.

>The 1st arg is None, which is arguably a bug in isql.IsqlCmd. 

Are you absolutely sure that self.prompt is None. AFAICT D.prompt should
be an instance of the Prompt class and that will cause the stacktrace
above. A None value will cause a NPE which is a different bug. Please
recheck the value of D.prompt.

>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.

That code is located in org\python\util\ReadlineConsole.java. 

>Or, if you'd rather have someone more familiar with the internals do it,
>I certainly understand.

Well, I prefer that it is implemented by someone who really want it to
work. If you decide to try, feel free to ask questions and seek advice
on jython-dev.

regards,
finn