NodeJS arguments processing

args.js

var args = {}
process.argv.slice(2).forEach( param => {
    var values = param.split( '=' )
    var key = values.shift()
    args[ key ] = ( args[ key ] || [] ).concat( values.join( '=' ) )
} )

var actions = {
    'help help' : args => `help\t\tPrints help (default action)\n` ,
    'help' : args => `\nSuper-puper server!\n${ actions['actions']() }${ actions['options']() }`,
    'actions help' : args => `actions\t\tPrints all available actions\n` ,
    'actions' : args => {
        var res = `\nActions:\n\n`
        Object.keys( actions ).forEach( path => {
            if( !/ help$/.test( path ) ) return
            res += actions[ path ]( args )
        } )
        return res
    } ,
    'options help' : args => `options\t\tPrints common options\n` ,
    'options' : args => {
        var res = `\nCommon options:\n\n`
        res += `host=localhost\thost to bind server\n`
        res += `port=80\t\tport to bind server\n`
        return res
    } ,
    'server actions help' : args => `server actions\tPrints all actions supported by server\n` ,
    'server actions' : args => {
        var res = `\nServer actions:\n\n`
        Object.keys( actions ).forEach( path => {
            if( !/^server .+ help$/.test( path ) ) return
            res += actions[ path ]( args )
        } )
        return res
    } ,
    'server start help' : args => `server start\tStarts server\n` ,
    'server start' : args => {
        return `Server started at ${ args.port || 80 } port`
    } ,
    'server stop help' : args => `server stop\tStops server\n` ,
    'server stop' : args => {
        return `Server stopped`
    } ,
}

var keys = Object.keys( args )
while( keys.length ) {
    var path = keys.join(' ')
    var handler = actions[ path ]
    if( handler ) break
    keys.pop()
}
if( !keys.length ) handler = actions[ 'help' ]

console.log( handler( args ) )