[IPython-user] [pyreadline]Support for running as subprocess?

Jörgen Stenarson jorgen.stenarson at bostream.nu
Thu Mar 16 15:45:08 CST 2006

Liu Jin skrev:
> [Sorry if this is a repost, I'm not sure my mailer delivered it or not]
> On Windows, IPython running as an inferior process in Emacs produces
> no output. That's because Windows has no psuedo-tty, so the
> WriteConsole etc. calls are failing. I made a quick&dirty change to
> console.py along these lines:
> import os
> ntemacs_hack = int(os.environ.get('READLINE_NTEMACS_HACK','0'))
> class Console(object):
>     ...
>     if ntemacs_hack:
>         def write_color(self, text, attr=None):
>             junk = c_int(0)
>             self.WriteFile(self.hout, text, len(text), byref(junk), None)
>             return len(text)
>         write_plain = write_color
>     else:
>         original write_color & write_plain definitions
>     ...
> The main functionalities seem ok. But there are plenty more console
> api calls uncovered, yet I'm uncertain how to fix them. I guess this
> problem will eventually disappear as IPython be decoupled from
> readline, but any chance for a quick fix before that?
When I try your patch ipython crashes in emacs producing the attached 
crash_report. Actually I have a variation of your patch looking at the 
EMACS environment variable that emacs sets to true when running an 
inferior process (at least my version of xemacs).

What versions of emacs/xemacs, python-mode.el and ipython.el, do you 
use? Which revisions of ipython.py and pyreadline?

I have also tried to use an inferior python process (disabling 
ipython.el) and that works without your patch. Perhaps Fernando has some 
ideas? I'm no emacs user myself and I don't understand the mechanics of 
the emacs connection.

The crash seems to be when I hit some code in genutils.write that is not 
supposed to run (according to code comments).

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