ce4c83ff
 wxy
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'use strict';
var isPromise = require('is-promise');
/**
* Return a function that will run a function asynchronously or synchronously
*
* example:
* runAsync(wrappedFunction, callback)(...args);
*
* @param {Function} func Function to run
* @param {Function} cb Callback function passed the `func` returned value
* @return {Function(arguments)} Arguments to pass to `func`. This function will in turn
* return a Promise (Node >= 0.12) or call the callbacks.
*/
var runAsync = module.exports = function (func, cb) {
cb = cb || function () {};
return function () {
var async = false;
var args = arguments;
var promise = new Promise(function (resolve, reject) {
var answer = func.apply({
async: function () {
async = true;
return function (err, value) {
if (err) {
reject(err);
} else {
resolve(value);
}
};
}
}, Array.prototype.slice.call(args));
if (!async) {
if (isPromise(answer)) {
answer.then(resolve, reject);
} else {
resolve(answer);
}
}
});
promise.then(cb.bind(null, null), cb);
return promise;
}
};
runAsync.cb = function (func, cb) {
return runAsync(function () {
var args = Array.prototype.slice.call(arguments);
if (args.length === func.length - 1) {
args.push(this.async());
}
return func.apply(this, args);
}, cb);
};
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