From: Srijayanth Sridhar <srijayanth@...>
Date: 2009-04-15T23:24:49+09:00
Subject: pretty format arrays

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Hello,

I am using OptionParser and one of the nifty things it has is multi line
descriptions for each option. I have a particularly long list of valid
arguments for a valid option, for instance cities=[London,Paris,NY......].
If printed in a single line it runs over and looks ugly. My hack so far is:

def pretty_print_list list,num=5
   a=[]
   (0...list.size).step(num) { |i| a << (list[i...i+num]).join(',') }
   a
end

This returns a list of strings which I pass as *list to the OptionParser .on
method as follows:

arg.on("--city [CITY]",cities,*list) { |o| options.city=o }

The hack works fine, but on a broader subject, is there a nice easy way of
grouping arrays? In python Range accepts a step value which is quite
awesome...

Thanks,

Jayanth

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