print code with syntax highlighting using Vim's hardcopy

code2pdf_with_vim.sh

#!/bin/bash

tmpd="$(mktemp -d)"

mergedpdf=merged_source_files.pdf
if [ "$1" == "-o" ]; then
    mergedpdf="$2"
    shift 2
fi

idx=00
while [ "$1" != "" ]; do
    fn="$1"
    shift 1

    echo Converting "$fn"...
    idxstr="$(printf "%03d%s\n" $idx)"
    idx=$((idx + 1))
    ps_fn="$tmpd/out-$idxstr.ps"
    pdf_fn="$tmpd/out-$idxstr.pdf"
    vim -c 'set printoptions=number:y' -c "hardcopy > $ps_fn" -c quit "$fn"
    ps2pdf "$ps_fn" "$pdf_fn"
done

set -x
pwd

echo "Merging into $mergedpdf"
pdfunite "$tmpd"/*.pdf "$mergedpdf"
rm -r "${tmpd}"