80 lines
2.4 KiB
JavaScript
80 lines
2.4 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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'use strict';
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const assert = require('assert');
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const fs = require('fs');
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const path = require('path');
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const RN_CLI_CONFIG = 'rn-cli.config.js';
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/**
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* Module capable of getting the configuration that should be used for
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* the `rn-cli`. The configuration file is a JS file named `rn-cli.config.js`.
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* It has to be on any parent directory of the cli.
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*
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* The function will return all the default configuration functions overriden
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* by those found on `rn-cli.config.js`, if any. If no default config is
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* provided and no configuration can be found in the directory hierarchy an
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* error will be thrown.
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*/
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const Config = {
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get(cwd, defaultConfig, pathToConfig) {
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let baseConfig;
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// Handle the legacy code path where pathToConfig is unspecified
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if (pathToConfig === undefined) {
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const configPath = Config.findConfigPath(cwd);
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if (!configPath && !defaultConfig) {
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throw new Error(
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`Can't find "${RN_CLI_CONFIG}" file in any parent folder of "${cwd}"`
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);
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}
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baseConfig = require(configPath);
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} else if (pathToConfig == null) {
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assert(defaultConfig, 'Must have a default config if config is missing');
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} else {
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baseConfig = path.isAbsolute(pathToConfig) ?
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require(pathToConfig) :
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require(path.join(cwd, pathToConfig));
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}
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return {
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...defaultConfig,
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...baseConfig,
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cwd,
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};
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},
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findConfigPath(cwd) {
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const parentDir = findParentDirectory(cwd, RN_CLI_CONFIG);
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return parentDir ? path.join(parentDir, RN_CLI_CONFIG) : null;
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},
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};
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// Finds the most near ancestor starting at `currentFullPath` that has
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// a file named `filename`
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function findParentDirectory(currentFullPath, filename) {
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const root = path.parse(currentFullPath).root;
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const testDir = (parts) => {
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if (parts.length === 0) {
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return null;
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}
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const fullPath = path.join(root, parts.join(path.sep));
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var exists = fs.existsSync(path.join(fullPath, filename));
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return exists ? fullPath : testDir(parts.slice(0, -1));
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};
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return testDir(currentFullPath.substring(root.length).split(path.sep));
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}
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module.exports = Config;
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