markdown2pdf

#!/bin/bash
#
# Converts FYST markdown documents to pdf using pandoc.
#
set -eu

usage() {
    echo "Usage: markdown2pdf [OPTION]... INPUT.md [OUTPUT.pdf]"
}

error() {
    echo "$@"
    exit 1
}

# defaults
data_dir=$(cd $(dirname "${BASH_SOURCE[0]}") && pwd)
echo $data_dir
pandoc_opts=(
    "--data-dir=$data_dir"
    "--filter=$data_dir/filters/diagrams.py"
    "--filter=pandoc-citeproc"
    "--latex-engine=xelatex"
    "--standalone"
    "--variable=fontsize:11pt"
    "--variable=geometry:margin=1in"
    "--variable=graphics-path:$data_dir"
    "--variable=mainfont:DejaVu Serif"
)

# options
while [[ $# -gt 0 ]]; do
    case "$1" in
        -h|--help)
            usage
            exit 0
            ;;
        --table-of-contents|--toc)
            pandoc_opts+=("--table-of-contents")
            shift
            ;;

        --)
            shift
            break
            ;;
        *)
            break
            ;;
    esac
done

case $# in
    1)
        md=$1
        pdf=$(basename "${md%.md}.pdf")   
        ;;
    2)
        md=$1
        pdf=$2
        ;;

    *)
        usage
        exit 1
        ;;
esac

[[ -f $md ]] || error "not a regular file: $md"
[[ -d $pdf ]] && pdf="$pdf/$(basename "${md%.md}.pdf")"

# colophon
colophon="pdf created $(date --iso-8601=seconds) by $USER from $(realpath $md)"
colophon=$(sed 's/_/\\_/g' <<< "$colophon")

pandoc_opts+=("--variable=colophon:$colophon")

# git info
wd=$(pwd)
cd $(dirname "$md")
if [[ -d .git ]]; then
    git_desc=$(git describe --all --always --long 2>/dev/null || echo none)

    git_origin=$(git config remote.origin.url || echo none)
    git_origin=${git_origin#git@}
    git_origin=${git_origin%.git}

    git_status=$(git status --porcelain "$(basename "$md")" | cut -c-2)
    case $git_status in
          '') git_status=ok ;;
        ' M') git_status=modified ;;
        '??') git_status=untracked ;;
    esac

    git_info="git origin=$git_origin commit=$git_desc status=$git_status"
    git_info=$(sed 's/_/\\_/g' <<< "$git_info")
    echo $git_info
    pandoc_opts+=("--variable=git-info:$git_info")
fi
cd "$wd"

if [[ -f bibliography.bib ]]; then
    pandoc_opts+=("--bibliography=bibliography.bib")
fi

pandoc "$md" -o "$pdf" "${pandoc_opts[@]}"