From: Michael Fellinger <m.fellinger@...>
Date: 2006-11-16T08:29:16+09:00
Subject: Re: Fully justified/center justified output

On 11/16/06, Juozas Gaigalas <juozas@tuesdaystudios.com> wrote:
> Philip Hallstrom wrote:
> >> Hi, how do I go about fully justifying/center justifying output text
> >> in ruby?
> >>
> >> I'm guessing I have to use sprintf but I can't seem to get it working
> >> properly, not sure of the correct "%" characters (don't know the
> >> proper name for them).
> >
> > http://corelib.rubyonrails.org/classes/String.html#M001536
> >
> >   str.center(integer, padstr) => new_str
> >
> > If integer is greater than the length of str, returns a new String of
> > length integer with str centered and padded with padstr; otherwise,
> > returns str.
> >
> >    "hello".center(4)         #=> "hello"
> >    "hello".center(20)        #=> "       hello        "
> >    "hello".center(20, '123') #=> "1231231hello12312312"
> >
> >
> If you're printing to terminal, you'll need to know the terminal width
> before use can use String#center. This is simple in Windows because
> cmd.exe terminal is fixed-width. In Linux and OSX this is more
> complicated. The easiest way I know is this:
>
> require "curses"
>
> width = Curses::cols
> "hello".center(width)
>
> It's not totally clear from your post if this is what you're trying to
> do, but if it is I hope this works you.

To do that without curses:

h, w = `stty size`.split.map{|e| e.to_i}
# [70, 55]
'foo'.center(w)
# "                          foo                          "