378 lines
14 KiB
JavaScript
378 lines
14 KiB
JavaScript
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/**
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* @fileoverview Responsible for loading config files
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* @author Seth McLaughlin
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const path = require("path"),
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os = require("os"),
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ConfigOps = require("./config/config-ops"),
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ConfigFile = require("./config/config-file"),
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ConfigCache = require("./config/config-cache"),
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Plugins = require("./config/plugins"),
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FileFinder = require("./util/file-finder");
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const debug = require("debug")("eslint:config");
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//------------------------------------------------------------------------------
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// Constants
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//------------------------------------------------------------------------------
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const PERSONAL_CONFIG_DIR = os.homedir();
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const SUBCONFIG_SEP = ":";
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Determines if any rules were explicitly passed in as options.
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* @param {Object} options The options used to create our configuration.
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* @returns {boolean} True if rules were passed in as options, false otherwise.
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* @private
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*/
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function hasRules(options) {
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return options.rules && Object.keys(options.rules).length > 0;
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}
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/**
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* Determines if a module is can be resolved.
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* @param {string} moduleId The ID (name) of the module
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* @returns {boolean} True if it is resolvable; False otherwise.
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*/
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function isResolvable(moduleId) {
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try {
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require.resolve(moduleId);
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return true;
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} catch (err) {
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return false;
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}
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}
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//------------------------------------------------------------------------------
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// API
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//------------------------------------------------------------------------------
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/**
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* Configuration class
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*/
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class Config {
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/**
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* @param {Object} providedOptions Options to be passed in
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* @param {Linter} linterContext Linter instance object
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*/
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constructor(providedOptions, linterContext) {
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const options = providedOptions || {};
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this.linterContext = linterContext;
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this.plugins = new Plugins(linterContext.environments, linterContext.defineRule.bind(linterContext));
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this.options = options;
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this.ignore = options.ignore;
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this.ignorePath = options.ignorePath;
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this.parser = options.parser;
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this.parserOptions = options.parserOptions || {};
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this.configCache = new ConfigCache();
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this.baseConfig = options.baseConfig
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? ConfigOps.merge({}, ConfigFile.loadObject(options.baseConfig, this))
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: { rules: {} };
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this.baseConfig.filePath = "";
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this.baseConfig.baseDirectory = this.options.cwd;
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this.configCache.setConfig(this.baseConfig.filePath, this.baseConfig);
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this.configCache.setMergedVectorConfig(this.baseConfig.filePath, this.baseConfig);
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this.useEslintrc = (options.useEslintrc !== false);
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this.env = (options.envs || []).reduce((envs, name) => {
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envs[name] = true;
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return envs;
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}, {});
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/*
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* Handle declared globals.
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* For global variable foo, handle "foo:false" and "foo:true" to set
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* whether global is writable.
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* If user declares "foo", convert to "foo:false".
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*/
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this.globals = (options.globals || []).reduce((globals, def) => {
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const parts = def.split(SUBCONFIG_SEP);
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globals[parts[0]] = (parts.length > 1 && parts[1] === "true");
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return globals;
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}, {});
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this.loadSpecificConfig(options.configFile);
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// Empty values in configs don't merge properly
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const cliConfigOptions = {
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env: this.env,
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rules: this.options.rules,
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globals: this.globals,
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parserOptions: this.parserOptions,
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plugins: this.options.plugins
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};
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this.cliConfig = {};
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Object.keys(cliConfigOptions).forEach(configKey => {
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const value = cliConfigOptions[configKey];
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if (value) {
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this.cliConfig[configKey] = value;
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}
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});
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}
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/**
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* Loads the config options from a config specified on the command line.
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* @param {string} [config] A shareable named config or path to a config file.
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* @returns {void}
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*/
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loadSpecificConfig(config) {
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if (config) {
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debug(`Using command line config ${config}`);
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const isNamedConfig =
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isResolvable(config) ||
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isResolvable(`eslint-config-${config}`) ||
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config.charAt(0) === "@";
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this.specificConfig = ConfigFile.load(
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isNamedConfig ? config : path.resolve(this.options.cwd, config),
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this
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);
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}
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}
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/**
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* Gets the personal config object from user's home directory.
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* @returns {Object} the personal config object (null if there is no personal config)
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* @private
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*/
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getPersonalConfig() {
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if (typeof this.personalConfig === "undefined") {
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let config;
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const filename = ConfigFile.getFilenameForDirectory(PERSONAL_CONFIG_DIR);
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if (filename) {
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debug("Using personal config");
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config = ConfigFile.load(filename, this);
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}
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this.personalConfig = config || null;
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}
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return this.personalConfig;
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}
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/**
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* Builds a hierarchy of config objects, including the base config, all local configs from the directory tree,
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* and a config file specified on the command line, if applicable.
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* @param {string} directory a file in whose directory we start looking for a local config
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* @returns {Object[]} The config objects, in ascending order of precedence
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* @private
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*/
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getConfigHierarchy(directory) {
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debug(`Constructing config file hierarchy for ${directory}`);
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// Step 1: Always include baseConfig
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let configs = [this.baseConfig];
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// Step 2: Add user-specified config from .eslintrc.* and package.json files
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if (this.useEslintrc) {
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debug("Using .eslintrc and package.json files");
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configs = configs.concat(this.getLocalConfigHierarchy(directory));
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} else {
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debug("Not using .eslintrc or package.json files");
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}
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// Step 3: Merge in command line config file
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if (this.specificConfig) {
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debug("Using command line config file");
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configs.push(this.specificConfig);
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}
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return configs;
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}
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/**
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* Gets a list of config objects extracted from local config files that apply to the current directory, in
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* descending order, beginning with the config that is highest in the directory tree.
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* @param {string} directory The directory to start looking in for local config files.
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* @returns {Object[]} The shallow local config objects, in ascending order of precedence (closest to the current
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* directory at the end), or an empty array if there are no local configs.
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* @private
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*/
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getLocalConfigHierarchy(directory) {
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const localConfigFiles = this.findLocalConfigFiles(directory),
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projectConfigPath = ConfigFile.getFilenameForDirectory(this.options.cwd),
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searched = [],
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configs = [];
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for (const localConfigFile of localConfigFiles) {
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const localConfigDirectory = path.dirname(localConfigFile);
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const localConfigHierarchyCache = this.configCache.getHierarchyLocalConfigs(localConfigDirectory);
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if (localConfigHierarchyCache) {
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const localConfigHierarchy = localConfigHierarchyCache.concat(configs);
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this.configCache.setHierarchyLocalConfigs(searched, localConfigHierarchy);
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return localConfigHierarchy;
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}
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/*
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* Don't consider the personal config file in the home directory,
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* except if the home directory is the same as the current working directory
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*/
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if (localConfigDirectory === PERSONAL_CONFIG_DIR && localConfigFile !== projectConfigPath) {
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continue;
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}
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debug(`Loading ${localConfigFile}`);
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const localConfig = ConfigFile.load(localConfigFile, this);
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// Ignore empty config files
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if (!localConfig) {
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continue;
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}
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debug(`Using ${localConfigFile}`);
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configs.unshift(localConfig);
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searched.push(localConfigDirectory);
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// Stop traversing if a config is found with the root flag set
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if (localConfig.root) {
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break;
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}
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}
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if (!configs.length && !this.specificConfig) {
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// Fall back on the personal config from ~/.eslintrc
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debug("Using personal config file");
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const personalConfig = this.getPersonalConfig();
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if (personalConfig) {
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configs.unshift(personalConfig);
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} else if (!hasRules(this.options) && !this.options.baseConfig) {
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// No config file, no manual configuration, and no rules, so error.
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const noConfigError = new Error("No ESLint configuration found.");
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noConfigError.messageTemplate = "no-config-found";
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noConfigError.messageData = {
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directory,
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filesExamined: localConfigFiles
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};
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throw noConfigError;
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}
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}
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// Set the caches for the parent directories
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this.configCache.setHierarchyLocalConfigs(searched, configs);
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return configs;
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}
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/**
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* Gets the vector of applicable configs and subconfigs from the hierarchy for a given file. A vector is an array of
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* entries, each of which in an object specifying a config file path and an array of override indices corresponding
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* to entries in the config file's overrides section whose glob patterns match the specified file path; e.g., the
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* vector entry { configFile: '/home/john/app/.eslintrc', matchingOverrides: [0, 2] } would indicate that the main
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* project .eslintrc file and its first and third override blocks apply to the current file.
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* @param {string} filePath The file path for which to build the hierarchy and config vector.
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* @returns {Array<Object>} config vector applicable to the specified path
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* @private
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*/
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getConfigVector(filePath) {
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const directory = filePath ? path.dirname(filePath) : this.options.cwd;
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return this.getConfigHierarchy(directory).map(config => {
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const vectorEntry = {
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filePath: config.filePath,
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matchingOverrides: []
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};
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if (config.overrides) {
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const relativePath = path.relative(config.baseDirectory, filePath || directory);
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config.overrides.forEach((override, i) => {
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if (ConfigOps.pathMatchesGlobs(relativePath, override.files, override.excludedFiles)) {
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vectorEntry.matchingOverrides.push(i);
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}
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});
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}
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return vectorEntry;
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});
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}
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/**
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* Finds local config files from the specified directory and its parent directories.
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* @param {string} directory The directory to start searching from.
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* @returns {GeneratorFunction} The paths of local config files found.
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*/
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findLocalConfigFiles(directory) {
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if (!this.localConfigFinder) {
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this.localConfigFinder = new FileFinder(ConfigFile.CONFIG_FILES, this.options.cwd);
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}
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return this.localConfigFinder.findAllInDirectoryAndParents(directory);
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}
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/**
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* Builds the authoritative config object for the specified file path by merging the hierarchy of config objects
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* that apply to the current file, including the base config (conf/eslint-recommended), the user's personal config
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* from their homedir, all local configs from the directory tree, any specific config file passed on the command
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* line, any configuration overrides set directly on the command line, and finally the environment configs
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* (conf/environments).
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* @param {string} filePath a file in whose directory we start looking for a local config
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* @returns {Object} config object
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*/
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getConfig(filePath) {
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const vector = this.getConfigVector(filePath);
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let config = this.configCache.getMergedConfig(vector);
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if (config) {
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debug("Using config from cache");
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return config;
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}
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// Step 1: Merge in the filesystem configurations (base, local, and personal)
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config = ConfigOps.getConfigFromVector(vector, this.configCache);
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// Step 2: Merge in command line configurations
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config = ConfigOps.merge(config, this.cliConfig);
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if (this.cliConfig.plugins) {
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this.plugins.loadAll(this.cliConfig.plugins);
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}
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/*
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* Step 3: Override parser only if it is passed explicitly through the command line
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* or if it's not defined yet (because the final object will at least have the parser key)
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*/
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if (this.parser || !config.parser) {
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config = ConfigOps.merge(config, { parser: this.parser });
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}
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// Step 4: Apply environments to the config
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config = ConfigOps.applyEnvironments(config, this.linterContext.environments);
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this.configCache.setMergedConfig(vector, config);
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return config;
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}
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}
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module.exports = Config;
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