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https://github.com/balena-io/etcher.git
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c44594b45e
ES6 fat arrows provide reasonable `this` behaviour, which protects us from some subtle accidental bugs, and erradicates `const self = this` from the codebase. Far arrows were not applied in Mocha code and AngularJS controllers/services constructors since these frameworks rely on `.bind()` on those functions. Signed-off-by: Juan Cruz Viotti <jviottidc@gmail.com>
88 lines
2.2 KiB
JavaScript
88 lines
2.2 KiB
JavaScript
/*
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* Copyright 2016 Resin.io
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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const fs = require('fs');
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const options = require('./cli');
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const logStream = options.log ? fs.createWriteStream(options.log) : null;
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const STDOUT_STREAM = logStream || process.stdout;
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const STDERR_STREAM = logStream || process.stderr;
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/**
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* The purpose of this module is to workaround an Electron Windows issue
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* where an Electron process with `ELECTRON_RUN_AS_NODE` enabled will
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* not attach `stdout`/`stderr` to the process, therefore not allowing
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* us to redirect output to a file from `child_process` or console pipes.
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*
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* A temporary solution is to implement logic that redirects output
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* to a log file in the Etcher CLI.
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*
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* TODO: Delete this file, and the corresponding `--log` option once
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* this issue is fixed in Electron.
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* See: https://github.com/electron/electron/issues/5715
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*/
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/**
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* @summary Write a line to stdout
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* @function
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* @public
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*
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* @description
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* If the `--log` option was passed, this function writes the line
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* to it, otherwise to `process.stdout`.
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*
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* @param {String} line - line
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*
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* @example
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* log.toStdout('Hello world!');
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*/
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exports.toStdout = (line) => {
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STDOUT_STREAM.write(line + '\n');
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};
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/**
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* @summary Write a line to stderr
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* @function
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* @public
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*
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* @description
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* If the `--log` option was passed, this function writes the line
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* to it, otherwise to `process.stderr`.
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*
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* @param {String} line - line
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*
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* @example
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* log.toStderr('Hello world!');
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*/
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exports.toStderr = (line) => {
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STDERR_STREAM.write(line + '\n');
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};
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/**
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* @summary Close any used streams, if needed
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* @function
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* @public
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*
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* @example
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* log.close();
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*/
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exports.close = () => {
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if (logStream) {
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logStream.close();
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}
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};
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