convert Commonmark files into manpages

cman.sh

#!/bin/bash
#-----------------------------------------------------------
# Copyright (C) 2015 GRUBERND http://grubernd.at
# released under a FreeBSD License
#
# converts commonmark files into man pages
# http://commonmark.org/
# dependencies: cmark
#
# the cmark files are expected to be named like this:
# commandname.x.mkd
# where x is the section according to
# https://www.kernel.org/doc/man-pages/
#-----------------------------------------------------------

documentationfolder="./docs"
manpagefolder="./usr_share_man"

[[ ! -d "$manpagefolder" ]] && mkdir -p "$manpagefolder"
cd "$documentationfolder"
for cmarkfile in *.mkd; do
    manfile=${cmarkfile%.*}
    manname=${manfile%.*}
    mannumber=${manfile##*.}
    case $mannumber in
        "1") centralheader="User Command";;
        "2") centralheader="System Call Documentation";;
        "3") centralheader="Library Function";;
        "4") centralheader="Device Document";;
        "5") centralheader="File Format Description";;
        "7") centralheader="General Information Overview";;
        "8") centralheader="Superuser / System Administration Command";;
        *)   centralheader="Unknown Category";;
    esac
    filedate=$(stat -c %y $cmarkfile | cut -d ' ' -f1)

    echo -e ".TH $manname $mannumber \"$filedate\" \"\" \"$centralheader\"" > "../$manpagefolder/$manfile"
    cmark "$cmarkfile" --to man >> "../$manpagefolder/$manfile"
done
cd ../