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#!/usr/bin/env bash

function example

{

local user=__REQUIRED__

local port=22

local sudo=0

local verbose=0

local argvars=( user port sudo verbose )

local remains=()

while test -n "$1"; do

eval '

case $1 in

-u | --user ) shift; user=$1 ;; # username

-p | --port ) shift; port=$1 ;; # port [22]

-s | --sudo ) sudo=1 ;; # sudo to root

-v ) verbose=1 ;; # verbose

-h | --help ) usage; return ;; # usage

* ) remains+=("$1")

esac

shift

'

done

for varname in "${argvars[@]}"; do

(( verbose )) && echo "$varname: ${!varname}"

if [ "${!varname}" == "__REQUIRED__" ]; then

echo "Missing required option '${varname}'"

usage

return

fi

done

}

function usage

{

local caller=${FUNCNAME[1]}

local regex

local args options comment

regex='(.*))(.*)#(.*)'

while read -r line; do

if [[ $line =~ $regex ]]; then

printf "[%s] [%s] [%s]\n" "${BASH_REMATCH[@]:1}"

list 3 args options comment "${BASH_REMATCH[@]:1}"

eval trim\ {args,options,comment}\;

# trim args

# trim options

# trim comment

printf "(%s) (%s) (%s)\n" $args $options $comment

set +x xtrace

fi

done < <( declare -f "$caller" )

}

function trim

{

# this is a hacky trim, it will also remove extra whitespace from

# inside the string

local s v t;

v=$1;

s=${!v};

explode2 "${s}" $'\x20\x09' "t"

s="${t[*]}"

echo "trum: '$s'"

}

function list

{

# usage: data=( big red ball ); list 3 size color toy "${data[@]}"

local count=$1; shift

local vars=()

local loop

for (( loop=0; loop<count; loop++ )); do vars+=("$1"); shift; done

for (( loop=0; loop<count; loop++ )); do printf -v "${vars[$loop]}" "%s" "$1"; shift; done

}

function explode2

{

local string=${1:-} && shift

local delim=${1:- } && shift

local array_name=${1:-EXPLODED} && shift

IFS="$delim" read -a "$array_name" <<<"$string";

}

if [[ ${BASH_SOURCE[@]} == $0 ]]; then example; fi