文件操作 - create-output-stream.js
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文件: /usr/share/atom/resources/app/apm/node_modules/fs-extra/lib/streams/create-output-stream.js
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var path = require('path') var fs = require('fs') var mkdir = require('../mkdirs') var WriteStream = fs.WriteStream function createOutputStream (file, options) { var dirExists = false var dir = path.dirname(file) options = options || {} // if fd is set with an actual number, file is created, hence directory is too if (options.fd) { return fs.createWriteStream(file, options) } else { // this hacks the WriteStream constructor from calling open() options.fd = -1 } var ws = new WriteStream(file, options) var oldOpen = ws.open ws.open = function () { ws.fd = null // set actual fd if (dirExists) return oldOpen.call(ws) // this only runs once on first write mkdir.mkdirs(dir, function (err) { if (err) { ws.destroy() ws.emit('error', err) return } dirExists = true oldOpen.call(ws) }) } ws.open() return ws } module.exports = createOutputStream
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