From: Trans <transfire@...>
Date: 2008-03-02T23:12:26+09:00
Subject: Re: Named sprintf parameters



On Feb 28, 3:42 pm, "Adam Shelly" <adam.she...@gmail.com> wrote:
> On 2/28/08, yermej <yer...@gmail.com> wrote:
>
>
>
> > On Feb 28, 11:29 am, ara howard <ara.t.how...@gmail.com> wrote:
>
> > > class String
> > >    module M
> > >      def % *args
> > >        newstuff
> > >        super
> > >      end
> > >    end
> > >    include M
> > > end
>
> > However, when I try anything like that, it only calls the original
> > method. The method defined inside of M isn't called.
> ...
>
> I also couldn't get Ara's example to work, so I resorted to monkeypatching.
> (Yes, I know, I am Destroying Ruby..)
>
> ----------
>
> p "I am %s."  % "string"
> p "I am %s."  % ["array"]
> p "I am %s."  % { :name => "hash" }
> begin
> p "I am %(name)s." % { :name => "hash" }
> rescue ArgumentError => err
>  p "caught #{err}"
> end
>
> puts "\nMonkeyPatching!\n\n"
> class String
>   alias :old_percent :%
>   def % arg
>     arr = (arg.kind_of? Array) ? arg : [arg]
>     target = self.gsub(/%\((.+?)\)/){|m|
>       raise ArgumentError, "named parameters need hash" unless arg.kind_of? Hash
>       arr << arg[$1.to_sym]
>       "%#{arr.size}$"
>     }
>     target.old_percent arr
>   end
> end
>
> p "I am %s."  % "string"
> p "I am %s."  % ["array"]
> p "I am %s."  % { :name => "hash" }
> p "I am %(name)s." % { :name => "hash" }
>
> p "I am %(name)s %(with)s %(what)s"%{:what => "multiple arguments",
>         :with => "including", :name=> 'hash'}
> p "I am %(name)s %(with)s %1$p"%{:with => "containing", :name=> 'hash'}
> p "I am %(name)s." % [:name, "array"]
>
> -Adam

Looks like you get the prize ;)

I would like to add this to Facets, though under a slightly different
naming of course. Not sure what though #printfv #sprintfv ?

Thanks!
T.