2 * @fileoverview Main CLI object.
3 * @author Nicholas C. Zakas
9 * The CLI object should *not* call process.exit() directly. It should only return
10 * exit codes. This allows other programs to use the CLI object and still control
11 * when the program exits.
14 //------------------------------------------------------------------------------
16 //------------------------------------------------------------------------------
18 const fs = require("fs"),
19 path = require("path"),
20 { promisify } = require("util"),
21 { ESLint } = require("./eslint"),
22 CLIOptions = require("./options"),
23 log = require("./shared/logging"),
24 RuntimeInfo = require("./shared/runtime-info");
26 const debug = require("debug")("eslint:cli");
28 //------------------------------------------------------------------------------
30 //------------------------------------------------------------------------------
32 /** @typedef {import("./eslint/eslint").ESLintOptions} ESLintOptions */
33 /** @typedef {import("./eslint/eslint").LintMessage} LintMessage */
34 /** @typedef {import("./eslint/eslint").LintResult} LintResult */
35 /** @typedef {import("./options").ParsedCLIOptions} ParsedCLIOptions */
37 //------------------------------------------------------------------------------
39 //------------------------------------------------------------------------------
41 const mkdir = promisify(fs.mkdir);
42 const stat = promisify(fs.stat);
43 const writeFile = promisify(fs.writeFile);
46 * Predicate function for whether or not to apply fixes in quiet mode.
47 * If a message is a warning, do not apply a fix.
48 * @param {LintMessage} message The lint result.
49 * @returns {boolean} True if the lint message is an error (and thus should be
50 * autofixed), false otherwise.
52 function quietFixPredicate(message) {
53 return message.severity === 2;
57 * Translates the CLI options into the options expected by the CLIEngine.
58 * @param {ParsedCLIOptions} cliOptions The CLI options to translate.
59 * @returns {ESLintOptions} The options object for the CLIEngine.
62 function translateOptions({
69 errorOnUnmatchedPattern,
84 reportUnusedDisableDirectives,
85 resolvePluginsRelativeTo,
90 allowInlineConfig: inlineConfig,
92 cacheLocation: cacheLocation || cacheFile,
94 errorOnUnmatchedPattern,
96 fix: (fix || fixDryRun) && (quiet ? quietFixPredicate : true),
101 env: env && env.reduce((obj, name) => {
105 globals: global && global.reduce((obj, name) => {
106 if (name.endsWith(":true")) {
107 obj[name.slice(0, -5)] = "writable";
109 obj[name] = "readonly";
113 ignorePatterns: ignorePattern,
119 overrideConfigFile: config,
120 reportUnusedDisableDirectives: reportUnusedDisableDirectives ? "error" : void 0,
121 resolvePluginsRelativeTo,
123 useEslintrc: eslintrc
128 * Count error messages.
129 * @param {LintResult[]} results The lint results.
130 * @returns {{errorCount:number;warningCount:number}} The number of error messages.
132 function countErrors(results) {
134 let warningCount = 0;
136 for (const result of results) {
137 errorCount += result.errorCount;
138 warningCount += result.warningCount;
141 return { errorCount, warningCount };
145 * Check if a given file path is a directory or not.
146 * @param {string} filePath The path to a file to check.
147 * @returns {Promise<boolean>} `true` if the given path is a directory.
149 async function isDirectory(filePath) {
151 return (await stat(filePath)).isDirectory();
153 if (error.code === "ENOENT" || error.code === "ENOTDIR") {
161 * Outputs the results of the linting.
162 * @param {ESLint} engine The ESLint instance to use.
163 * @param {LintResult[]} results The results to print.
164 * @param {string} format The name of the formatter to use or the path to the formatter.
165 * @param {string} outputFile The path for the output file.
166 * @returns {Promise<boolean>} True if the printing succeeds, false if not.
169 async function printResults(engine, results, format, outputFile) {
173 formatter = await engine.loadFormatter(format);
175 log.error(e.message);
179 const output = formatter.format(results);
183 const filePath = path.resolve(process.cwd(), outputFile);
185 if (await isDirectory(filePath)) {
186 log.error("Cannot write to output file path, it is a directory: %s", outputFile);
191 await mkdir(path.dirname(filePath), { recursive: true });
192 await writeFile(filePath, output);
194 log.error("There was a problem writing the output file:\n%s", ex);
205 //------------------------------------------------------------------------------
207 //------------------------------------------------------------------------------
210 * Encapsulates all CLI behavior for eslint. Makes it easier to test as well as
211 * for other Node.js programs to effectively run the CLI.
216 * Executes the CLI based on an array of arguments that is passed in.
217 * @param {string|Array|Object} args The arguments to process.
218 * @param {string} [text] The text to lint (used for TTY).
219 * @returns {Promise<number>} The exit code for the operation.
221 async execute(args, text) {
222 if (Array.isArray(args)) {
223 debug("CLI args: %o", args.slice(2));
226 /** @type {ParsedCLIOptions} */
230 options = CLIOptions.parse(args);
232 log.error(error.message);
236 const files = options._;
237 const useStdin = typeof text === "string";
240 log.info(CLIOptions.generateHelp());
243 if (options.version) {
244 log.info(RuntimeInfo.version());
247 if (options.envInfo) {
249 log.info(RuntimeInfo.environment());
252 log.error(err.message);
257 if (options.printConfig) {
259 log.error("The --print-config option must be used with exactly one file name.");
263 log.error("The --print-config option is not available for piped-in code.");
267 const engine = new ESLint(translateOptions(options));
269 await engine.calculateConfigForFile(options.printConfig);
271 log.info(JSON.stringify(fileConfig, null, " "));
275 debug(`Running on ${useStdin ? "text" : "files"}`);
277 if (options.fix && options.fixDryRun) {
278 log.error("The --fix option and the --fix-dry-run option cannot be used together.");
281 if (useStdin && options.fix) {
282 log.error("The --fix option is not available for piped-in code; use --fix-dry-run instead.");
285 if (options.fixType && !options.fix && !options.fixDryRun) {
286 log.error("The --fix-type option requires either --fix or --fix-dry-run.");
290 const engine = new ESLint(translateOptions(options));
294 results = await engine.lintText(text, {
295 filePath: options.stdinFilename,
299 results = await engine.lintFiles(files);
303 debug("Fix mode enabled - applying fixes");
304 await ESLint.outputFixes(results);
307 let resultsToPrint = results;
310 debug("Quiet mode enabled - filtering out warnings");
311 resultsToPrint = ESLint.getErrorResults(resultsToPrint);
314 if (await printResults(engine, resultsToPrint, options.format, options.outputFile)) {
316 // Errors and warnings from the original unfiltered results should determine the exit code
317 const { errorCount, warningCount } = countErrors(results);
318 const tooManyWarnings =
319 options.maxWarnings >= 0 && warningCount > options.maxWarnings;
321 if (!errorCount && tooManyWarnings) {
323 "ESLint found too many warnings (maximum: %s).",
328 return (errorCount || tooManyWarnings) ? 1 : 0;
335 module.exports = cli;