Neat little alias & technique to facilite troff

[Doug Gwyn]

In article <920 at houxu.UUCP> jhv at houxu.UUCP (James Van Ornum) writes:
>	tbl <<!EOF | eqn | pic | troff -mm | ipr -ltroff
>	...
>	!EOF

That's pretty cute, but it assumes there is only one way the
document will ever be formatted/typeset.  In case anyone wants
to pursue this subject, I enclose an extension of the "doctype"
command described in Kernighan & Pike; followups should go to
some other newsgroup, or if you have improvements please send
them to me <Gwyn at BRL.ARPA>:

#!/usr/5bin/sh
#	doctype -- synthesize proper command line for troff
#	adapted from Kernighan & Pike

#	last edit:	86/08/25	D A Gwyn
#	SCCS ID:	@(#)doctype.sh	1.8

PATH=/usr/5bin:/bin:/usr/bin
if pdp11
then	MACDIR=/usr/lib/tmac
else	MACDIR=/usr/5lib/tmac		# BRL System V emulation
fi

eopt=
macs=
opts=
topt=
for i
do	case "$i" in
	-e)	eopt="$i";		shift;;
	-m*)	macs="$macs $i";	shift;;
	-T*)	topt=" $i";		shift;;
	--)				shift;	break;;
	-)					break;;
	-*)	opts="$opts $i";	shift;;
	*)					break;;
	esac
done

if [ $# -gt 0 ]
then	s="cat $* | "
else	s=
fi

t=`cat $* |
egrep '^\.(EQ|TS|\[|P|G1|IS)' |
sort -u |
awk '
/^\.P$/ { mm++ }
/^\.PP/ { ms++ }
/^\.EQ/ { eqn++ }
/^\.TS/ { tbl++ }
/^\.PS/ { pic++ }
/^\.G1/ { grap++ }
/^\.IS/ { ideal++ }
/^\.\[/ { refer++ }
END {
	if (refer > 0)	printf "refer | "
	if (grap > 0)	printf "grap | "
	if (grap > 0 || pic > 0)	printf "_PIC_ | "
	if (ideal > 0)	printf "ideal | "
	if (tbl > 0)	printf "tbl | "
	if (eqn > 0)	printf "_EQN_ | "
	printf "_TROFF_"
	if (grap > 0 || pic > 0)	printf " -mpic"
	if (mm > 0)	printf " -mm"
	if (ms > 0 && mm == 0)	printf " -ms"
	printf " -\n"
} ' | sed -e s/_PIC_/"pic$topt"/ -e s/_EQN_/"eqn$topt"/ \
	-e s/_TROFF_/"troff$topt$opts$macs"/ -e s%' -m'%" $MACDIR/tmac."%g`

if [ -n "$eopt" ]
then	eval "$s$t"
else	echo $s$t
fi