transfer argv to a config object
npm install argv-config
var argv_config= require("argv-config");
//argv_config= function ([target [, argv [, workPath]]])
var cfg = argv_config(); //default usage
cfg = argv_config({}, "--a 001 --b --c cc ".split(" ")); // `--key` `value` pair set string value
assert(JSON.stringify(cfg) === '{"a":"001","b":null,"c":"cc"}'); // single `--key` set null
cfg = argv_config({}, "--a 001 --b bb --config {b:22}".split(" ")); //--config {json-data}
assert(JSON.stringify(cfg) === '{"a":"001","b":22}'); //value will be replaced by the later
cfg = argv_config({}, "--a 001 --b bb --config {b:22} -c {b:33} -d 44".split(" "), null,
{ "-c": "config", "-d": "dd" }); //replace short key with normal key (prefixed with '--')
assert(JSON.stringify(cfg) === '{"a":"001","b":33,"dd":"44"}');
cfg = argv_config({}, "--a 001 --b bb --config ./test-config.json".split(" "), __dirname); //--config from json file
assert(JSON.stringify(cfg) === '{"a":"001","b":22}');
cfg = argv_config({}, "--a 001 --b bb --config ./test-config.js".split(" "), __dirname); //--config from js module
assert(JSON.stringify(cfg) === '{"a":"001","b":22}');