[IPython-dev] Fwd: [Pythonmac-SIG] readline support for OS X Leopard

Boyd Waters bwaters@nrao....
Fri Oct 26 16:06:46 CDT 2007


If someone can point me in the right direction I'd love to solve this  
one.

The Python that ships with Leopard uses libedit, which includes a  
readline wrapper.

It seems to work, but I can't get the tab-completion to work in IPython.

ANSI color works fine. History navigation works fine. Command-line  
editing works fine.

No tab completion.

I can enter the lines one at a time at a Python console, everything  
seems to work. readline is imported. But I don't get the actual tab  
completion.

Got it to work on Tiger (OS X 10.4.x) no problem.


On Oct 22, 2007, at 7:48 PM, Brian Granger wrote:

> This is a heads up for ipython devs who use OS X.  I guess the builtin
> python on Leopard will have  a working readline module, but it won't
> use readline underneath the hood.  Instead is will use EditLine
> library:
>
> http://thrysoee.dk/editline/
>
> Once Leopard is out in the public, we can investigate how this will
> play with ipython.
>
> Cheers,
>
> Brian
>
> ---------- Forwarded message ----------
> From: Edward Moy <emoy@apple.com>
> Date: Oct 22, 2007 12:19 PM
> Subject: Re: [Pythonmac-SIG] readline support for OS X Leopard
> To: Noah Gift <noah.gift@gmail.com>
> Cc: PythonMac mac <pythonmac-sig@python.org>
>
>
>
> On Oct 21, 2007, at 10:51 PM, Noah Gift wrote:
> I have been getting ready for the official leopard release in a few
> days, and have been a bit worried about readline support.  I forgot
> what I did to get it to work for IPython, which I absolutely cannot
> live without anymore.  Is there a plan for a Leopard binary that fixes
> readline, or can I help someone prepare some documentation on getting
> readline working properly.  I don't have a lot of time during the next
> couple of weeks to get into compile hell, but if someone has any easy
> fix to get readline to work, I would greatly appreciate it.
> The installed version of python on Leopard will actually have readline
> support turned on by default, but it uses the EditLine (libedit)
> library, not the GNU Readline (due to licensing reasons).  While
> functionally equivalent, the command syntax is different.  From the
> python(1) man page:
>
>
> INTERACTIVE INPUT EDITING AND HISTORY SUBSTITUTION
>       The Python inteterpreter supports editing of the current input  
> line and
>       history substitution, similar to facilities found in the Korn  
> shell and
>       the  GNU  Bash shell.  However, rather than being implemented  
> using the
>       GNU Readline library, this Python interpreter  uses  the  BSD   
> EditLine
>       library editline(3) with a GNU Readline emulation layer.
>
>       The  readline  module  provides the access to the EditLine  
> library, but
>       there are a few major differences compared to a traditional  
> implementa-
>       tion  using  the  Readline  library.   The command language  
> used in the
>       preference files is that of EditLine, as described in  
> editrc(5) and not
>       that   used  by  the  Readline  library.   This  also  means   
> that  the
>       parse_and_bind() routines uses EditLine commands.  And  the   
> preference
>       file itself is ~/.editrc instead of ~/.inputrc.
>
>       For  example,  the rlcompleter module, which defines a  
> completion func-
>       tion for the  readline  modules,  works  correctly  with  the   
> EditLine
>       libraries, but needs to be initialized somewhat differently:
>
>              import rlcompleter
>              import readline
>              readline.parse_and_bind("bind ^I rl_complete")
>
>       For vi mode, one needs:
>
>              readline.parse_and_bind("bind -v")
>
>
>
>
> --------------------------------------------------------------------------
>
> Edward Moy
>
> Apple Computer, Inc.
>
> emoy@apple.com
>
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