mk-command/config/paths.js

'use strict';

const path = require('path');
const fs = require('fs');
const url = require('url');

//应用目录
const appDirectory = fs.realpathSync(process.cwd());

const resolveApp = relativePath => path.resolve(appDirectory, relativePath);
const resolveOwn = relativePath => path.resolve(__dirname, '..', relativePath);

const envPublicUrl = process.env.PUBLIC_URL;



//路径中末尾反斜杆的处理
function ensureSlash(path, needsSlash) {
    const hasSlash = path.endsWith('/');
    if (hasSlash && !needsSlash) {
        return path.substr(path, path.length - 1);
    } else if (!hasSlash && needsSlash) {
        return `${path}/`;
    } else {
        return path;
    }
}

const getPublicUrl = appPackageJson =>
    envPublicUrl || require(appPackageJson).homepage;


function getServedPath(appPackageJson) {
    const publicUrl = getPublicUrl(appPackageJson);
    const servedUrl =
        envPublicUrl || (publicUrl ? url.parse(publicUrl).pathname : '/');
    return ensureSlash(servedUrl, true);
}

module.exports = {
    dotenv: resolveApp('.env'),
    appPath: resolveApp('.'),
    appBuild: resolveApp('build'),
    appDevBuild: resolveApp('build/dev'),
    appProdBuild: resolveApp('build/prod'),
    appPackage: resolveApp('build/pkg'),
    appPackageDev: resolveApp('build/pkg-dev'),
    appPublic: resolveApp('dist'),
    appIndexJs: resolveApp('index.js'),
    appPackageJson: resolveApp('package.json'),
    appSrc: resolveApp('.'),
    yarnLockFile: resolveApp('yarn.lock'),
    appNodeModules: resolveApp('node_modules'),
    publicUrl: getPublicUrl(resolveApp('package.json')),
    servedPath: getServedPath(resolveApp('package.json')),
    ownPath: resolveOwn('.'),
    ownNodeModules: resolveOwn('node_modules')
};