RE: [Jython-dev] Command history problems in rc1

[Adam B. <ada...@gb...>]

Jim wrote:

"
I'm new to this list so I'm sorry if this has been answered recently (I
did a search through the archive and it didn't come up with anything).

Anyway, I'm having a problem with the command history in Jython.  When I
hit the up arrow, instead of getting my previous commands, I get  ^[OA.
Command history works correctly in CPython 2.0.  Is this feature
supported in Jython?

I'm running on JDK 1.3 (Blackdown 1.3.0 FCS).

Any suggestions?
"

This was answered recently on the (gradually more defunct) JPython list,
more info will be in that archive:


> -----Original Message-----
> From:	Robert W. Bill [SMTP:rb...@di...]
> Sent:	Sunday, January 07, 2001 12:47 AM
> To:	Steve Cohen
> Cc:	jpy...@py...
> Subject:	Re: [JPython] jpython interpreter under linux
> 
> On Sat, 6 Jan 2001, Steve Cohen wrote:
> > I am trying to run jpython interactively from a pc at home.  I am used 
> > to running it at work under NT 2000, where it works quite nicely.  At 
> > home, though, I have a PC on which I can run either Windows 98 or Red 
> > Hat LInux 6.2.  Forget Win98, it doesn't have a console worth messing 
> > with, total crap.
> > 
> > Under Linux, there are several console programs.  The default one, 
> > kvt, konsole, the Gnome shell and more.  All have the same problem 
> > with jpython.  Something is causing the interactive jpython program 
> > not to recognize the up and down arrow keys as requests for the 
> > previous/next command in the history.  This does not happen when the 
> > shells are just at system command line mode (shell is bash), nor does 
> > it happen under CPython.  In both of these cases the arrow keys work 
> > as expected.  But when JPython is running, pressing them gets output 
> > like [[A or something similar.
> > 
> > Is there a fix to this?  Or how about a workaround, another way to 
> > access the history functions?
> 
> Hello Steve,
> 
> What enables the up-down arrow history keys is the readline module.  This
> is compiled into your CPython, and all the shells you mention.  Readline
> is not available for JPython so the arrow keys do not work.  It's not a
> matter of JPython looking to the shell for this, because it cannot, as
> CPython cannot, but rather a matter of looking at the compiled-in readline
> 
> which CPython can, but Jython cannot.
> 
> Although what your thinking of is sensible- a shell the wraps the running
> process.  I know Yorick has one, and there may be others, but emacs is a
> great solution for Linux.  If you start emacs and windows, go into shell
> mode, start Jython- *then* you have up-down arrow readline history with
> the Jython intereactive console (and cool editor).
> 
> Regards,
> Robert
> 
> 
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