#!/bin/bash
# Self-documenting help system
# 2018-03-16

# Usage: 	Setup 'getopts' while loop, and add comments after each option:
#			s)	<code> # comment
# Call:		[ $(which getusage) ] && getusage $0

[ $# == 0 ] && echo $(basename $0): Please specify filename. && exit 1
[ ! -f $1 ] && echo $(basename $0): File not found. && exit 1 

blok=$(sed '/^\s*while getopts/,/^\s*done$/!d' $1)
args=$(sed '/getopts/!d;s/.* \"//;s/\".*//;s/://g' <<< "$blok")
opts=$(sed '/# /!d;s/^\s*/  -/;s/)\s.*# /    /' <<< "$blok")

if [ "$args" ]; then
	echo "usage: $(basename $1) [-$args]";echo
	[ "$opts" ] && echo "$opts"
fi