#!/bin/bash

: "${1:?Missing filename!}"

FILENAME="$(mktemp)"

cleanup() {
    rm -f "$FILENAME"
}

trap 'cleanup' INT HUP TRAP

shift_header() {
    read -r line < "$1"

    if [[ "$line" = "# "* ]]; then
        echo "---"
        echo "title: ${line#"# "}"
        echo "---"
        tail -n +2 "$1"
    else
        cat "$1"
    fi
}

main() {
    local -a pandoc_options=(
	'--from=gfm+tex_math_dollars+footnotes+emoji-autolink_bare_uris'
	'--to=html+raw_html'
	'--mathjax'
	"--template=${HOME}/.local/share/default.html"
	"--variable=published_time=$(date -Iseconds -d"$(stat "$1" | grep 'Birth:' | sed 's/.*Birth:\s//')")"
    )
    pandoc "${pandoc_options[@]}" <(shift_header "$1") > "$FILENAME" 2>/dev/null &&
    firefox "$FILENAME" 2>/dev/null & disown

    sleep 5
    cleanup
}

main "$@"