#!/usr/bin/env bash

usage() {
    cat <<EOF
usage $0 [-o OUTPUT][-t TITLE][-h]

Options:
  -o, --output      saves file to OUTPUT.pdf in current directory
  -t, --title       title for the OUTPUT.pdf
  -h, --help        show this message
EOF
}

working_dir=$(pwd)
header="$working_dir/header.md"

formatting() {
    cat <<EOF
---
toc-title: $1
documentclass: report
linkcolor: blue
geometry: margin=1in
---
EOF
}

# parsing long form
for arg in "$@"; do
    shift
    case "$arg" in
        '--help')       set -- "$@" '-h'    ;;
        '--title')      set -- "$@" '-t'    ;;
        '--output')     set -- "$@" '-o'    ;;
        *)              set -- "$@" "$arg"  ;;
    esac
done

# parsing args
while getopts "ht:o:" opt ; do
    case "$opt" in 
        'h')
            usage
            exit 0
            ;;
        't')
            TITLE="$OPTARG"
            ;;
        'o')
            OUTPUT="$OPTARG"
            ;;
        '?')
            usage
            exit 1
            ;;
    esac
done

if [ -z "$OUTPUT" ] ; then
    # default to folder name
    OUTPUT=$(echo "$working_dir" | awk -F '/' '{print $NF}')
fi

if [ -z "$TITLE" ] ; then
    # defaults to output which will default to directory name
    TITLE="$OUTPUT" 
fi

# creates a temporary file for formatting
formatting "$TITLE" > $header
pandoc $header $working_dir/*.md --toc --toc-depth=1 -o "$OUTPUT.pdf"

# cleanup
rm "$working_dir/header.md"