#!/bin/sh

if [ $# -ne 1 ] ; then
	echo mk-xtrkcad-manual-html SRCDIR
	echo Run from the root of your build directory
	echo SRCDIR is the root of your source tree
	echo Output will be in XTrackCAD_Users_Manual-VERSION.pdf/.html
	exit 1
fi

SRCDIR=$1
BLDDIR=`pwd`


# Setup output name
OUTFILE="XTrackCAD_Users_Manual-"
VERSION="Unknown"
if [ -f "${BLDDIR}/xtrkcad-config.h" ] ; then
	VERSION=`grep XTRKCAD_VERSION ${BLDDIR}/xtrkcad-config.h|\
		sed -e 's/.*VERSION "//' -e 's/"//'`
	echo VERSION=$VERSION
else
	echo "Unknown Version"
fi
OUTFILE="${OUTFILE}${VERSION}"

if [ ! -d ${SRCDIR} ] ; then
	echo $SRCDIR does not exist
	exit 1
fi


# Check and setup directories
# Find .but files
BUTTDIR="${SRCDIR}/app/doc"
if [ ! -f ${BUTTDIR}/addm.but ] ; then
	echo $BUTTDIR does not contain .but files
	exit 1
fi

# working/output directory
if [ ! -d ${BLDDIR} ] ; then
	echo $BLDDIR does not exist
	exit 1
fi

# .html files
HTMLDIR=${BLDDIR}/app/doc/html
if [ ! -f ${HTMLDIR}/addM.html ] ; then
	echo $HTMLDIR does not contain .html files
	exit 1
fi


# extract .html file names from .but file
# prepend some headers with 'NEWPAGE '
# we convert this to html to generate page breaks when printing
extract() {
	grep '^\\[ACHS]' $1 |\
	sed \
		-e 's/^\\[ACH][0-9]*{/NEWPAGE /' \
		-e 's/^\\[S][0-9]*{//' \
		-e 's/}.*//' \
		-e '/^$/d' \
	       	-e 's/$/.html/' ;
}


# extract .html refs
cd $BUTTDIR
FILES="\
contents.html \
`extract intro.but.in` \
`extract addm.but` \
`extract changem.but` \
`extract drawm.but` \
`extract editm.but` \
`extract filem.but` \
`extract helpm.but` \
`extract hotbar.but` \
`extract macrom.but` \
`extract managem.but` \
`extract optionm.but` \
`extract statusbar.but` \
`extract view_winm.but` \
`extract navigation.but` \
`extract appendix.but` \
`extract ${BLDDIR}/app/help/messages.but` \
`extract upgrade.but` \
`extract warranty.but` \
NEWPAGE \
IndexPage.html"
#echo $FILES
#exit

# clean up .html: remove nav line, fix case file names
# create concatenated .html file
cd $HTMLDIR

> ${BLDDIR}/${OUTFILE}.html
for FILE in ${FILES} ; do
	if [ "${FILE}" = "NEWPAGE" ] ; then
		# This creates page break when printing from chrome but
		# NOT when using pandoc.
		# This is an open problem
		echo '<div style="break-after:page"></div>' \
       		>> ${BLDDIR}/${OUTFILE}.html
	else
		cat "${FILE}" |\
	       	grep -v 'Previous.*Next' |\
		sed \
			-e 's/bSensor.png/bsensor.png/'\
			-e 's/bControl.png/bcontrol.png/'\
			-e 's/iconlink.PNG/iconlink.png/'\
       		>> ${BLDDIR}/${OUTFILE}.html
	fi
done
#)


# convert to .pdf if we have pandoc
cd $BLDDIR
if [ -x /usr/bin/pandoc ] ; then
	cd $SRCDIR/app/doc/
	pandoc ${BLDDIR}/${OUTFILE}.html \
		--pdf-engine=pdflatex \
		--variable "geometry=margin=0.5in" \
		--variable fontsize=12pt \
		-o "${BLDDIR}/${OUTFILE}.pdf"
	echo Output: ${OUTFILE}.pdf
else
	# no pandoc: tell user to use chrome
	echo Output: ${OUTFILE}.html
	echo "Open with Chrome and Print to File as a PDF, from a directory containing png.d/"
	echo "You should specify a custom scale of at least 150%"
fi