use col -x to prevent col from turning whitespace into
tabs.  doing so assumes that troff knows specifics about
$font, and it typically doesn't.  the results are particularly
poor for "man 2 draw".

additionally, simplify the postprocessing pipeline.

Reference: /n/sources/patch/maybe/man-spc
Date: Thu Mar 18 18:18:03 CET 2010
Signed-off-by: quanstro@quanstro.net

--- /rc/bin/man	Thu Mar 18 18:11:06 2010
+++ /rc/bin/man	Thu Mar 18 18:11:05 2010
@@ -9,6 +9,15 @@
 S=/sys/man
 d=0
 
+fn pipeline{
+	if(~ $#* 0)
+		troff $Nflag $Lflag -$MAN | $postproc
+	if not{
+		p = $1; shift
+		$p | pipeline $*
+	}
+}
+
 fn roff {
 	preproc=()
 	postproc=cat
@@ -25,27 +34,13 @@
 		Lflag='-rL1000i'
 		# setting L changes page length to infinity (sed script removes empty lines)
 		if (grep -s '^\.(2C|sp *[0-9]*\.)' $2)
-			postproc=col
+			postproc=(col -x)
 	}
 	if(~ $x *eqn*)
 		preproc=($preproc eqn)
 	if(~ $x *tbl*)
 		preproc=($preproc tbl)
-	{echo -n $FONTS; cat $2 </dev/null} |
-		switch($#preproc) {
-		case 0
-			troff $Nflag $Lflag -$MAN 
-		case 1
-			$preproc | troff $Nflag $Lflag -$MAN
-		case 2
-			$preproc(1) | $preproc(2) | troff $Nflag $Lflag -$MAN
-		case 3
-			$preproc(1) | $preproc(2) | $preproc(3) |
-				troff $Nflag $Lflag -$MAN
-		case *
-			$preproc(1) | $preproc(2) | $preproc(3) |
-				$preproc(4) | troff $Nflag $Lflag -$MAN
-		} | $postproc
+	{echo -n $FONTS; cat $2 </dev/null} | pipeline $preproc
 }
 
 fn page {
@@ -54,7 +49,6 @@
 	if not
 		/bin/page
 }
-
 
 search=yes
 while(~ $d 0) {