Triangle Golf

A friend of mine recently had an assignment where he had to split up a text file and print it out as a triangle. Of course this was in "c" and so, just because I could I had to see just how simple it would be in perl. The idea is to take a ctriangle.txt file like

a a a a a a a a a
a a a a a a a a a
a a a a a a a a a
a a a a a a a a
[download]

and end up centered over 80 chars

       a
      a a
     a a a
    a a a a
   a a a a a
  a a a a a a
 a a a a a a a
 a a a a a a a
[download]

          The
         same
       principle
      applies to
    any text file,
  basically splitting
 words only on spaces
     or new lines
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My best shot was 132 chars (\n inc). I especially like the new trick I learnt.

/[ 
]+/
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Which matches space/new line combinations.

Well this is the best I could do, after staring at it for half an hour it wasnt getting any shorter.

open F,"ctriangle.txt";sub n{print
" "x(40-$r/2)."$x\n"};for(split/[ 
]+/,join'',<F>){$c=$r,n,$x=''if(
$r=length($x.=" $_"))>$c}n
[download]

- nashdj

Update:
With jeroenes idea, if I undef $/ by assigning it undef from an unused variable (not pretty but we're talking size) its down to 128 chars.

open F,"ctriangle.txt";sub n{print
" "x(40-$r/2)."$x\n"};$/=$w;$_=<F>;
for(split){$c=$r,n,$x=''if(
$r=length($x.=" $_"))>$c}n
[download]

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