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bug#18084: 24.3.92; python.el: buggy ipython support

From: Carlos Pita
Subject: bug#18084: 24.3.92; python.el: buggy ipython support
Date: Tue, 22 Jul 2014 17:54:12 -0300

Ipython is pretty smart doing autocompletion and output coloring but
python.el is currently getting in its way:

1) The coloring is heuristic at best. It's ok for the vanilla python
interpreter but not nearly as good as ipython's. Not only keywords and
identifiers are colored in non-code contexts, but also string quoting
gets often messed up. I think the best option is to disable font lock by
default when the interpreter is ipython.

2) Autocompletion of magic commands is broken. Autocompletion of paths
is broken. Maybe another kind of ipython specific autocompletion is
broken too. Currently the autocompletion prefix is parsed from the
buffer using a "dotty" syntax table that includes '.' and '_' as part of
identifiers. Clearly this is not enough to play well with ipython. But
fortunately it's not necessary to be too smart. Sendind the prefix up to
the first preceding whitespace char will do the trick.

So I propose to:

i) Disable font lock by default for ipython.
ii) Parsing the prefix up to whitespace char for ipython autocompletion.

I think these solutions are very simple and will improve the ipython
experience a lot. Obviously the color theme will differ from the one for
python-mode but this is a minor annoyance for such gain in simplicity.


In GNU Emacs (i686-pc-linux-gnu, GTK+ Version 3.12.2)
 of 2014-07-22 on carlos
Windowing system distributor `The X.Org Foundation', version 11.0.11502000
Configured using:
 `configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft
 'CFLAGS=-march=i686 -mtune=generic -O2 -pipe -fstack-protector-strong
 --param=ssp-buffer-size=4' CPPFLAGS=-D_FORTIFY_SOURCE=2

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