[IPython-dev] %history and %rep

[Hans Meine]

Am Donnerstag, 24. Mai 2007 23:11:34 schrieb Ville M. Vainio:
> %rep should use str(_) as the input line. I.e. the stringized version
> of the last result. Ever looked at those strings on variables that are
> so close yet so far, i.e. require you to do the productivity-killing
> chore of mouse-console-copypaste? Now you could do:
>
> $ l = ["hei", "vaan"]
>
> $ "".join(l)
>
> ==> heivaan
>
> $ rep
>
> $ heivaan_ <== cursor blinking
>
> I've often wanted to construct the input line and then edit it, but it
> always required copy-paste...

That is indeed a good idea (save the above rationale for the docs BTW).
I wonder whether %rep is a good name though.

Second, I want to say that your %rep 2 4 3:5 is a good idea, too - I very 
often define a macro "redo" only to repeat several steps at once.

Speaking of that - I often make the mistake that I pass comma-separated line 
numbers to %macro, e.g. "macro redo 4,5,7:10", which always throws "invalid 
literal for int()".  I would have provided a patch for extract_input_slices, 
but what do you think about that?  It could then also support "4,5,7-8".  Oh, 
it already supports "-" ranges, so I guess splitting on "," would not appear 
as a bad idea to anyone then?

Attached you'll find a small patch that does that, and also handles strange 
input like the latter examples:

%macro redo 4,5,7:10,15-16
%macro redo 4, 5, 7:10, 15-16
%macro redo 1,2 4 , 5, 7:10 15-16

Ciao, /  /
     /--/
    /  / ANS
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