fix readline extra space issue in sage (python vs. readline problem)
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> > On Mon, Mar 10, 2008 at 1:27 PM, Nikos Apostolakis <email@example.com> wrote: > > > > > > Hello group, > > > > > > the following is not terribly important but it bothers me. When > > > using the cli to SAGE the completion adds extra space after the > > > name of functions or methods. For example if I hit den[tab] in the > > > sage prompt I get denominator *, where the star stands for the > > > cursor, that is there is an extra space after "denominator". I am > > > then forced to either have a space between a function and the > > > parenthesis enclosing its arguments or to move the cursor back one > > > space. The former annoys me aesthetically and the latter wastes my > > > time (albeit a small fraction of it). > > > > > > Is there a way to turn this off? some configuration option perhaps? > > > > > > > (1) This is an Ipython problem. Probably Sage itself has little to do > > with it. Hence I've cc'd this message to Fernando Perez (author > > of IPython). > > > > (2) I just checked on a bunch of machines. The behavior you mention > > above does *not* occur on any of my OS X machines. It also does > > not occur for me on sage.math (a Debian 64-bit machine). It does > > occur on several 32-bit and 64-bit Linux installs that I have handy. > > Sage builds its own readline and uses exact the same config files > > on all machines, so I'm fairly puzzled by all this. > > I'm afraid it's not really an ipython problem, but how readline ends > up built on any given box. I've fought this particular one before: > > http://projects.scipy.org/pipermail/ipython-user/2005-April/002617.html > > As you can see, the python readline doesn't expose the necessary > functionality at all: > > http://mail.python.org/pipermail/python-list/2002-December/176942.html > > So the actual behavior will be hardcoded by however readline ends up > built. You may be able to tweak *your* readline build so that > HAVE_RL_COMPLETION_APPEND_CHARACTER is defined at build time and hence > you get the null completion character. Excellent. Since Sage builds its own readline, we can do what it takes to make sure this works. Thanks!
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