announcing mdoc.su, short manual page URLs

Dear misc, www,

I would like to announce and introduce <URL:http://mdoc.su/>, 
a deterministic URL shortener for BSD manual pages, 
written entirely in nginx.conf.

It supports several addressing schemes, for example:

  http://mdoc.su/o/pf
  http://mdoc.su/o/pf.4
  http://mdoc.su/o/4/pf
  http://mdoc.su/openbsd/pf
  http://mdoc.su/OpenBSD/pf

  http://mdoc.su/f/pf
  http://mdoc.su/n/pf
  http://mdoc.su/d/pf

  http://mdoc.su/o/sort.3p

  http://mdoc.su/o/intro.4.macppc
  http://mdoc.su/openbsd/macppc/4/intro

Source code for the whole mdoc.su.nginx.conf is available at:

  https://github.com/cnst/mdoc.su
  https://bitbucket.org/cnst/mdoc.su

Specifically, the following currently controls OpenBSD rewriting:

	location /OpenBSD {	rewrite	^/OpenBSD(/.*)?$	/o$1;	}
	location /o {
		set	$ob	"http://www.openbsd.org/cgi-bin/man.cgi?query=";
		set	$os	"&sektion=";
		rewrite	^/openbsd(/.*)?$	/.$1;
		rewrite	^/./([a-z]+[0-9]*[k]?)/([1-9]|3p)/([^/]+)$	$ob$3$os$2&arch=$1	redirect;
		rewrite	^/./([^/.]+)/([^/]+)$		$ob$2$os$1	redirect;
		rewrite	^/./([^/]+)\.([1-9]|3p)\.([a-z]+[0-9]*[k]?)$	$ob$1$os$2&arch=$3	redirect;
		rewrite	^/./([^/]+)\.([1-9]|3p)$	$ob$1$os$2	redirect;
		rewrite	^/./([^/]+)$			$ob$1$os	redirect;
		rewrite	^/./?$	/	last;
		return	404;
	}

Translation: "/OpenBSD" and "/openbsd" get rewritten to "/o" internally, 
without any extra replies to the user, and then the rest of the URI is 
analysed, and a "302 Found" redirect is finally issued to the user.  
(If you haven't yet noticed nginx in the base tree, here's your chance!)

Pages like http://mdoc.su/o/ redirect to the main "/" page internally, 
without affecting the URL that's visible to the user, making it easier 
to keep a starting page specifically for one BSD.

Questions, comments and suggestions are welcome.  
Available through IPv4 and IPv6.  
Enjoy!

Cheers,
Constantine.