[IPython-dev] Function specific hooks into the ipython tab completion system
Thu Nov 29 03:27:44 CST 2012
I've often thought this as well. Probably a full-blown IPEP is in
order here. Perhaps __annotations__ would be the correct way to go
On Thu, Nov 29, 2012 at 12:58 AM, Robert McGibbon <firstname.lastname@example.org> wrote:
> Tab completion in IPython is one of the things that makes it so useful,
> especially the context specific tab completion for things like "from ..."
> where only packages, or obviously the special completion for attributes when
> the line contains a dot.
> I use IPython for interactive data analysis a lot, and one of the most
> frequent operations is loading up data with something like numpy.loadtxt()
> or various related functions.
> It would be really awesome if we could annotate functions to interact with
> the tab completion system, perhaps for instance saying that argument 0 to
> numpy.loadtxt() is supposed to be a filename, so let's give tab-complete
> suggestions that try to look for directories/files. Some functions only
> files with specific extensions, so you could filter based on that or
> By hacking on the code for completerlib.py:cd_completer, I sketched out a
> little demo of what you could do with this: https://gist.github.com/4167151.
> The architecture is totally wrong, but it lets you get behavior like:
> In : ls
> datfile.dat dir1/ dir2/ file.gz random_junk test.py
> In : directory_as_a_variable = 'sdfsfsd'
> In : f = np.loadtxt(<TAB>
> datfile.dat dir1/ dir2/ file.gz
> In : normal_function(<TAB>
> Display all 330 possibilities? (y or n)
> In : g = np.loadtxt(di<TAB>
> dict dir1/ directory_as_a_variable
> dir dir2/ directory_of_my_choosing
> Basically hitting the tab completion, when np.loadtxt is on the input line,
> only shows directories and files that end with a certain extension. If you
> start to type in the name of an object in your namespace, it'll show up too,
> but only once you've typed in more than 1 matching character.
> The implementation in my gist is pretty lame. The way I've coded it up, the
> special behavior is based on simply finding the string "np.loadtxt" on the
> input line, not on the actual function. This means you can't really make the
> behavior specific to your position in the argument list (i.e. I know that
> the first arg is a filename, and so should be tab completed like this, but
> the other ones are not). I suspect the right way to do the implementation is
> via function decorators to specify the behavior and then adding to
> IPCompleter instead.
> I think I'm up for giving this a shot.
> Thoughts? Is this a feature anyone else would find interesting?
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