Re: cell-array display in class

[Colin Macdonald]

On 27/04/15 07:04, Oliver Heimlich wrote:
> It is not so easy. First, you have to decide whether “argn” represents
> coordinates of a cell-array. You could do this with a regular
> expression, but can't be 100% sure.

thanks for this `argn`!

Cannot be 100% sure?  Do you have a particular counterexample?  This 
seems to work for me:

if (isempty(inputname(1)) && regexp(argn, '^\[\d+,\d+\]$'))
  % we're in a cell array
  ...
else
  % whatever I did before.
end

If my input was actually `display([1,2])` then it won't be my 
@class/display that gets called :)

(Ok, needs to be a bit more complicated for all possible shapes of cell 
array but that regexp gives idea.)

> Second, you want to get access to the following variable (in ov-base.cc)
> to correctly indent your output. I think there currently is no way to
> access this value from within a m-file display method (unless you use an
> oct-file kludge).
>     int octave_base_value::curr_print_indent_level

Yes, that is unfortunate :(   I'm sure I have other things I should be 
worrying about but perhaps Octave could pass to us the current indent 
level as 2nd argument of display.  Thoughts?

Colin