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December 2, 2015 23:49
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Thought experiement on broccoli v1 changes to more easily hook into and/or compose inputNodes
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| function MyPlugin(inputNodes, options) { | |
| this.options = options; | |
| // In this example, let's say we need to do something special with the first | |
| // inputNode as compared to the others. | |
| [this.firstNode, ...this.otherNodes] = inputNodes; | |
| // Make sure we re-create event handlers new for every build (at least the ones | |
| // that require state be reset between builds) | |
| this.on('newBuild', () => { | |
| this.firstNode.on('beginNode', this.options.startCallback); // pre-firstNode | |
| this.firstNode.on('endNode', this.options.secondCallback); // post-firstNode | |
| this.otherNodes.forEach(n => n.on('endNode', this.options.postEachOtherCallback)); | |
| // Make `finalCallback` only get called after _all_ input nodes are fully finished | |
| // using the little eventComposeHelper util (included below). A bit superficial | |
| // but illustates needing to "hook" into the completion of X different nodes | |
| let callbackComposeHandlers = eventComposeHelper(inputNodes.length, this.options.finalCallback); | |
| inputNodes.forEach((n, i) => n.on('endNode', callbackComposeHandlers[i])); | |
| }); | |
| Plugin.call(inputNodes, options); | |
| } | |
| MyPlugin.prototype.build = function() { | |
| // A more sane way to "hook" around the completion of _all_ passed inputNodes | |
| // instead of the superfical above use of eventComposeHelper | |
| // this.options.finalCallback(); | |
| // Whatever else this plugin wants to do in its build ... | |
| } |
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| // Event composition util, example usage: | |
| // | |
| // var a = eventComposeHelper(2, () => console.log('DONE')) | |
| // a[0]() | |
| // a[1]() // DONE logged | |
| // | |
| function eventComposeHelper(numCallbacksNeeded, whenDone) { | |
| const callbacksCalled = Array(numCallbacksNeeded).fill(false); | |
| function buildCallbackHandler(index) { | |
| return function() { | |
| callbacksCalled[index] = true; | |
| if (callbacksCalled.every(x => x === true)) { | |
| whenDone(); | |
| callbacksCalled.fill(false); // if we need to run `whenDone` multiple times | |
| } | |
| } | |
| } | |
| return Array(numCallbacksNeeded).fill(null).map((x, i) => buildCallbackHandler(i)); | |
| } |
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