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Ghost/core/server/utils/pipeline.js
Hannah Wolfe 9d07e6f3be Pipeline util tests, clean & fix
no issue

- added comments to pipeline util, inc where it came from
- added tests for pipeline util
- tests uncovered a bug with promises for args, which has been fixed
2015-11-03 09:14:44 +00:00

32 lines
955 B
JavaScript

/**
* # Pipeline Utility
*
* Based on pipeline.js from when.js:
* https://github.com/cujojs/when/blob/3.7.4/pipeline.js
*/
var Promise = require('bluebird');
function pipeline(tasks /* initial arguments */) {
var args = Array.prototype.slice.call(arguments, 1),
runTask = function (task, args) {
// Self-optimizing function to run first task with multiple
// args using apply, but subsequent tasks via direct invocation
runTask = function (task, arg) {
return task(arg);
};
return task.apply(null, args);
};
// Resolve any promises for the arguments passed in first
return Promise.all(args).then(function (args) {
// Iterate through the tasks passing args from one into the next
return Promise.reduce(tasks, function (arg, task) {
return runTask(task, arg);
}, args);
});
}
module.exports = pipeline;