#!/bin/sh
#set -xv

PREVIEW_CMD="xdvi";
PRINT_CMD="txprl";
#
TMP_PRE="/tmp/texm";

NSEC="1000";	# how long "daemon" lives
SLEEP="2";	# how long "daemon" sleeps

		# Get display size for fullscreen previewing

SCREEN="`xdpyinfo | grep 'dimensions:' | awk '{print $2}'`";
#
if [ "$SCREEN" != "" ]; then
	PREVIEW="$PREVIEW_CMD -geometry ${SCREEN}-0-0";
else
	PREVIEW="$PREVIEW_CMD";
fi
	
DEVNULL=" </dev/null 1>/dev/null 2>&1 ";	# unused so far

AUTO="";					# Switch for Daemon
KILL="";					# Switch to kill Daemon(s)
PRINT=""
RESTART="";					# Switch to restart previewer
NOPROMPT="";
PAUSE="0";
BG="True";

prog="`basename $0`";				# our name

while [ "$1" != "" ]				# Process arguments
do
case $1 in 
        "-na")	AUTO="";
                ;;
        "-a")	AUTO="True";
                ;;
        "-np")	NOPROMPT="True";
                ;;
        "-nbg")	BG="";
                ;;
        "-p")	PRINT="True";
                ;;
        "-r")	RESTART="True";
                ;;
        "-k"*)	KILL="True";
                ;;
        "-s")	shift; SLEEP="$1";
                ;;
        "-t")	shift; NSEC="$1";
                ;;
        "-pause")	shift; PAUSE="$1";
                ;;
        "-"*)   echo; echo "$prog: $1 not an option"; exit 1;
                ;;
	*)	SRC="$1";
		;;
esac
shift
done
					# kill "daemon" if desired
if [ "$KILL" != "" ]; then
	ps x | grep $TMP_PRE | grep -v grep;
	for i in `ps x | grep $TMP_PRE | grep -v grep | awk '{print $1}'`
	do
		if [ "$i" = "" ]; then
			echo "$prog: Nothing to kill";
			exit 0;
		fi
		if [ "$NOPROMPT" = "" ]; then
			echo -n "Kill $i? [y]/n ";
			read Resp;
		else
			Resp="y";
		fi
		if [ "$Resp" != "n" ] && [ "$Resp" != "N" ]; then
			kill $i;
		fi
	done
	exit 0;
fi

					# check for source
if [ "$SRC" = "" ]; then
	SRC="`ls -t *.tex | head -1`";		# find newest *.tex
	echo "$prog: Setting source to $SRC"; echo;
fi

if [ "$SRC" = "" ] || [ ! -f "$SRC" ] && [ ! -f "$SRC.tex" ]; then
	echo "$prog: No file $SRC";		# couldn't find any source
	exit 1;
fi

if [ "`echo $SRC | grep '\.tex$'`" = "" ]; then
	SRC="$SRC.tex";				# append .tex if needed
fi

BASE="`basename $SRC .tex`";			# basename
DVI="$BASE.dvi";				# this is dvi file name

						# check if preview active
TEST="`ps x | grep "$PREVIEW_CMD" | grep "$BASE" | grep -v grep`"
if [ "$AUTO" = "" ] && [ "$TEST" = "" ] && [ "$NOPROMPT" = "" ]; then
						# if so nag about daemon
	echo; echo -n "Run texm \"daemon\" in background (or print)? y/[n]/p ";
	read Resp;
	if [ "$Resp" = "y" ] || [ "$Resp" = "Y" ]; then
		AUTO="True";
		echo "OK, using NSEC = $NSEC, SLEEP = $SLEEP ";
	elif [ "$Resp" = "p" ]; then
		PRINT="True";
	fi
fi

						# check for latex
if [ "`grep documentstyle $SRC | grep -v '^ *%'`" != "" ]; then
	TEX="latex $SRC";
	if ! $TEX; then				# do 1st latex
		exit 1;		
	fi
else
	TEX="tex $SRC";				# plain tex
fi

PREVIEW_ARGS="`grep -i '^%TEXM-PV:' $SRC | tail -1 | awk -F: '{print $2}'`";
if [ "$PREVIEW_ARGS" != "" ]; then
		PREVIEW="$PREVIEW_CMD $PREVIEW_ARGS ";
fi

if [ "$PRINT" != "" ]; then
	if $TEX; then				# tex it even if printing
		nohup $PRINT_CMD $BASE.dvi </dev/null 1>/dev/null 2>&1 &
	fi
	exit 0;
fi

RESTART="`grep -i '^%TEXM-RS:' $SRC`";

						# run tex/latex
if $TEX; then
						# check to see if previewer up
	TEST="`ps x | grep "$PREVIEW_CMD" | grep "$BASE" | grep -v grep | awk '{print $1}'`";
	if [ "$RESTART" != "" ]; then
		kill $TEST;
		TEST="";
	fi
	if [ "$TEST" = "" ]; then
	    if [ "$BG" != "" ]; then
		nohup $PREVIEW $BASE.dvi </dev/null 1>/dev/null 2>&1 &
	    else
		nohup $PREVIEW $BASE.dvi </dev/null 1>/dev/null 2>&1
	    fi
		sleep $PAUSE;
	fi
else
	sleep $PAUSE; sleep $PAUSE;
	exit 1;
fi

if [ "$AUTO" != "" ]; then			# do "daemon" stuff

TMP=${TMP_PRE}$$;
					##<<==
cat > $TMP << EOScript
#!/bin/sh

clean () {
	rm -f \$0;
}

trap "clean; exit 0" 15; 

i="0";
while [ "\$i" -lt $NSEC ]
do

sleep $SLEEP;
i="\`expr \$i + $SLEEP \`";
if [ ! -f Makefile ]; then	#<===

make -f - $DVI << EOMake
$DVI: $SRC
	texm $SRC
	if [ -w /dev/tty1 ]; then echo -n "" > /dev/tty1; fi


EOMake

else 				#<===

make

fi				#<===

done  


EOScript
					##<<==

chmod 755 $TMP;

eval $TMP $DEVNULL &

fi

exit 0;