#!/bin/rc
# '$Id: makempx.in,v 1.7 1997/12/01 19:21:12 olaf Exp $'
# Make an MPX file from the labels in a MetaPost source file,
# using mpto and either dvitomp (TeX) or dmp (troff).
# From John Hobby's original (though there's not much of it left by now).
# Public domain.

rfork e

rcs_revision='$Revision: 1.7 $'
version=1.7
DMP=dmp
DVITOMP=dvitomp
MAKEMPX_BINDIR=/sys/lib/texmf/bin/$objtype
MPFILE=''
MPXFILE=''
MPTEXPRE=mptexpre.tex
MPTOTEX=(mpto -tex)
MPTOTR=(mpto -troff)
NEWER=newer
TEX=tex
TROFF='eqn -d$$ | troff -Tpost'

# These names are documented in the MetaPost manual, so it's
# unwise to change them.
ERRLOG=mpxerr.log		# file for an error log if necessary
TEXERR=mpxerr.tex		# file for erroneous TeX if any
DVIERR=mpxerr.dvi		# troublesome dvi file if any
TROFF_INERR=mpxerr		# file for erroneous troff input, if any
TROFF_OUTERR=mpxerr.t		# file for troublesome troff output, if any


usage='Usage: '$0' [-tex|-troff] MPFILE MPXFILE.
  If MPXFILE is older than MPFILE, translate the labels from the MetaPost
  input file MPFIle to low-level commands in MPXFILE, by running
    $MPTOTEX, $TEX, and $DVITOMP
  by default; or, if -troff is specified,
    $MPTOTR, $TROFF, and $DMP.

  The current directory is used for writing temporary files.  Errors are
  left in mpxerr.{tex,log,dvi}.

  If the file named in \$MPTEXPRE (mptexpre.tex by default) exists, it is
  prepended to the output in tex mode.

Email bug reports to [email protected].'


mode=tex

while(! ~ $#* 0) {
	switch($1){
	case -help --help
		echo $usage
		exit usage
	case -version --version
		echo `{basename $0} '(Web2c 7.2)' $version
		echo 'There is NO warranty.  This script is public domain.
Primary author: John Hobby'
		exit
	case -troff --troff
		mode=troff
	case -tex --tex
		mode=tex
	case -*
		echo $0': Invalid option: '$1 >[1=2]
		echo 'Try '$0' --help for more information.' >[1=2]
		exit usage
	case *
		if(~ $MPFILE '')
			MPFILE=$1
		if not if(~ $MPXFILE '')
			MPXFILE=$1
		if not {
			echo $0': Extra argument '$1 >[1=2]
			echo 'Try '$0' --help for more information.' >[1=2]
			exit badusage
		}
	}
	shift
}

if(~ $MPFILE '' || ~ $MPXFILE '') {
	echo $0': need exactly two arguments' >[1=2]
	exit usage
}

# trap "rm -f mpx$$.* $ERRLOG; exit 4" 1 2 3 15

if($NEWER $MPFILE $MPXFILE) {
	switch($mode){
	case tex
		MPTO=$MPTOTEX
	case troff
		MPTO=$MPTOTR
	case *
		echo $0': unknown typesetter mode '$mode >[1=2]
		exit typeset
	}

	# Step 1: Extract typesetter source from MetaPost source.
	if(! $MPTO $MPFILE >mpx$pid.tex >[2]$ERRLOG) {
		echo $0': command failed:' $MPTO $MPFILE >[1=2]
		cat $ERRLOG >[1=2]
		rm -f mpx$pid.tex
		exit error
	}

	if(~ $mode troff)
		mv -f mpx$pid.tex mpx$pid.i

	# Step 2: Run typesetter.
	if(~ $mode tex) {
		if(test -r $MPTEXPRE) {
			cat $MPTEXPRE mpx$pid.tex >mpx$pid.tmp
			mv mpx$pid.tmp mpx$pid.tex
		}

		if($TEX --interaction'='batchmode mpx$pid.tex </dev/null >/dev/null) {
			WHATEVER_TO_MPX=$DVITOMP
			INFILE=mpx$pid.dvi
			INERROR=$DVIERR
		} 
		if not {
			mv -f mpx$pid.tex $TEXERR
			mv -f mpx$pid.log $ERRLOG
			echo $0': command failed:' $TEX $TEXERR; see $ERRLOG >[1=2]
			exit texfail
		}
	}
	if not if(~ $mode troff) {
		if(cat mpx$pid.i | eval $TROFF >mpx$pid.t) {
			WHATEVER_TO_MPX=$DMP
			INFILE=mpx$pid.t
			INERROR=$TROFF_OUTERR
		}
		if not {
			mv -f mpx$pid.i $TROFF_INERR
			echo $0': command failed:' cat $TROFF_INERR '|' $TROFF >[1=2]
			rm -f mpx$pid.t
			exit trofffail
		}
	}
	if not {
		echo can''''t happen >[1=2]
		exit coredump
	}

	# Step 3: Translate typesetter output to a MetaPost MPX.
	if(! $WHATEVER_TO_MPX $INFILE $MPXFILE >$ERRLOG) {
		mv -f $INFILE $INERROR
		~ $mode troff && mv -f mpx$pid.i $TROFF_INERR
		echo $0': command failed:' $WHATEVER_TO_MPX $INERROR $MPXFILE >[1=2]

		# Better to remove $MPXFILE if something went wrong rather than
		# leaving behind an unfinished or unusable version since $NEWER
		# might think that all is fine if $MPXFILE exists.
		rm -f $MPXFILE
		cat $ERRLOG >[1=2]
		exit trofffail
	}
	rm -f $ERRLOG mpx$pid.*
}

exit ''