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

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

while (( "$#" )); do
    MDFILE=$1
    echo "Processing ${MDFILE}."
    PDFFILE=$(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
links-as-notes: true
highlight-style: monochrome
citemethod: biblatex
toc: true
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

    shift
done