#!/usr/bin/env bash
DATADIR="$HOME/.local/share/md-previewer"
[ ! -d "$DATADIR" ] && mkdir -p "$DATADIR"

CSS="$DATADIR/pub.css"
if [ ! -e "$CSS" ]; then
  pushd "$DATADIR"
  wget https://github.com/manuelp/pandoc-stylesheet/raw/acac36b976966f76544176161ba826d519b6f40c/pub.css \
    || (echo "ERROR: Unable to fetch CSS!" >&2) || exit 1
  popd
fi

case $(uname | tr '[:upper:]' '[:lower:]') in
  darwin)
    OPEN=open
    ;;
  linux)
    OPEN=xdg-open
    ;;
esac

command -v pandoc || (echo "ERROR: Pandoc not found!" >&2) || exit 1
HTML=$(sed 's/\.md\s*$/.html/' <<<"$1")
pandoc "$1" -s -c "$CSS" -o "$HTML"

command -v "$OPEN" || (echo "WARN: Can't open HTML with \"$OPEN\"!  " \
                            "Please navigate to file://$(realpath "$HTML")" >&2)
"$OPEN" "$HTML"