vue hello world项目
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/**
* Copyright (c) 2015-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file at
* https://github.com/facebook/create-react-app/blob/master/LICENSE
*/
const open = require('open')
const execa = require('execa')
const chalk = require('chalk')
const execSync = require('child_process').execSync
// https://github.com/sindresorhus/open#app
const OSX_CHROME = 'google chrome'
const Actions = Object.freeze({
NONE: 0,
BROWSER: 1,
SCRIPT: 2
})
function getBrowserEnv () {
// Attempt to honor this environment variable.
// It is specific to the operating system.
// See https://github.com/sindresorhus/open#app for documentation.
const value = process.env.BROWSER
let action
if (!value) {
// Default.
action = Actions.BROWSER
} else if (value.toLowerCase().endsWith('.js')) {
action = Actions.SCRIPT
} else if (value.toLowerCase() === 'none') {
action = Actions.NONE
} else {
action = Actions.BROWSER
}
return { action, value }
}
function executeNodeScript (scriptPath, url) {
const extraArgs = process.argv.slice(2)
const child = execa('node', [scriptPath, ...extraArgs, url], {
stdio: 'inherit'
})
child.on('close', code => {
if (code !== 0) {
console.log()
console.log(
chalk.red(
'The script specified as BROWSER environment variable failed.'
)
)
console.log(chalk.cyan(scriptPath) + ' exited with code ' + code + '.')
console.log()
}
})
return true
}
function startBrowserProcess (browser, url) {
// If we're on OS X, the user hasn't specifically
// requested a different browser, we can try opening
// Chrome with AppleScript. This lets us reuse an
// existing tab when possible instead of creating a new one.
const shouldTryOpenChromeWithAppleScript =
process.platform === 'darwin' &&
(typeof browser !== 'string' || browser === OSX_CHROME)
if (shouldTryOpenChromeWithAppleScript) {
try {
// Try our best to reuse existing tab
// on OS X Google Chrome with AppleScript
execSync('ps cax | grep "Google Chrome"')
execSync('osascript openChrome.applescript "' + encodeURI(url) + '"', {
cwd: __dirname,
stdio: 'ignore'
})
return true
} catch (err) {
// Ignore errors.
}
}
// Another special case: on OS X, check if BROWSER has been set to "open".
// In this case, instead of passing the string `open` to `open` function (which won't work),
// just ignore it (thus ensuring the intended behavior, i.e. opening the system browser):
// https://github.com/facebook/create-react-app/pull/1690#issuecomment-283518768
if (process.platform === 'darwin' && browser === 'open') {
browser = undefined
}
// Fallback to open
// (It will always open new tab)
try {
const options = { app: { name: browser }, url: true }
open(url, options).catch(() => {}) // Prevent `unhandledRejection` error.
return true
} catch (err) {
return false
}
}
/**
* Reads the BROWSER environment variable and decides what to do with it. Returns
* true if it opened a browser or ran a node.js script, otherwise false.
*/
exports.openBrowser = function (url) {
const { action, value } = getBrowserEnv()
switch (action) {
case Actions.NONE:
// Special case: BROWSER="none" will prevent opening completely.
return false
case Actions.SCRIPT:
return executeNodeScript(value, url)
case Actions.BROWSER:
return startBrowserProcess(value, url)
default:
throw new Error('Not implemented.')
}
}