#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'

if [ $# -lt 1 ] ; then
    echo "$(basename $0) MARKDOWN-FILE" >&2
    exit 1
fi

MDFILE=$1
PDFFILE=$(basename $MDFILE .md).pdf
FILE=$(mktemp XXXXXXXXXX-${MDFILE})
HAS_METADATA=0

if head -n 1 ${MDFILE} | grep -- '---' > /dev/null ; then
    echo "Metadata Block Found"
    HAS_METADATA=1
fi

cat <<EOF >> $FILE
---
documentclass: scrartcl
classoption:
 - DIV=14
papersize: a5
fontsize: 10pt
mainfont: LucidaBrightOT
mainFontOptions:
 - Numbers=OldStyle
sansfont: LucidaSansOT
mathFont: LucidaBrightMathOT
monofont: IBMPlexMono
monofontoptions:
 - Scale=MatchLowercase
 - StylisticSet=3
csquotes: true
highlight-style: monochrome
citemethod: biblatex
pdfa: true
hyperrefoptions:
 - breaklinks=true
 - bookmarks=true
EOF

if [ $HAS_METADATA -eq 1 ] ; then
    cat $MDFILE | sed '1 d' >> $FILE
else
    echo "..." >> $FILE
    cat $MDFILE >> $FILE
fi

echo "Processing file to PDF."
pandoc -f markdown \
       -s -t pdf \
       --highlight-style monochrome \
       --pdf-engine='lualatex' \
       -o $PDFFILE \
       $FILE

echo "Done."

rm $FILE