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							| @@ -0,0 +1,173 @@ | ||||
| #!/usr/bin/env node | ||||
|  | ||||
| /** | ||||
|  * @fileoverview Main CLI that is run via the eslint command. | ||||
|  * @author Nicholas C. Zakas | ||||
|  */ | ||||
|  | ||||
| /* eslint no-console:off -- CLI */ | ||||
|  | ||||
| "use strict"; | ||||
|  | ||||
| // must do this initialization *before* other requires in order to work | ||||
| if (process.argv.includes("--debug")) { | ||||
|     require("debug").enable("eslint:*,-eslint:code-path,eslintrc:*"); | ||||
| } | ||||
|  | ||||
| //------------------------------------------------------------------------------ | ||||
| // Helpers | ||||
| //------------------------------------------------------------------------------ | ||||
|  | ||||
| /** | ||||
|  * Read data from stdin til the end. | ||||
|  * | ||||
|  * Note: See | ||||
|  * - https://github.com/nodejs/node/blob/master/doc/api/process.md#processstdin | ||||
|  * - https://github.com/nodejs/node/blob/master/doc/api/process.md#a-note-on-process-io | ||||
|  * - https://lists.gnu.org/archive/html/bug-gnu-emacs/2016-01/msg00419.html | ||||
|  * - https://github.com/nodejs/node/issues/7439 (historical) | ||||
|  * | ||||
|  * On Windows using `fs.readFileSync(STDIN_FILE_DESCRIPTOR, "utf8")` seems | ||||
|  * to read 4096 bytes before blocking and never drains to read further data. | ||||
|  * | ||||
|  * The investigation on the Emacs thread indicates: | ||||
|  * | ||||
|  * > Emacs on MS-Windows uses pipes to communicate with subprocesses; a | ||||
|  * > pipe on Windows has a 4K buffer. So as soon as Emacs writes more than | ||||
|  * > 4096 bytes to the pipe, the pipe becomes full, and Emacs then waits for | ||||
|  * > the subprocess to read its end of the pipe, at which time Emacs will | ||||
|  * > write the rest of the stuff. | ||||
|  * @returns {Promise<string>} The read text. | ||||
|  */ | ||||
| function readStdin() { | ||||
|     return new Promise((resolve, reject) => { | ||||
|         let content = ""; | ||||
|         let chunk = ""; | ||||
|  | ||||
|         process.stdin | ||||
|             .setEncoding("utf8") | ||||
|             .on("readable", () => { | ||||
|                 while ((chunk = process.stdin.read()) !== null) { | ||||
|                     content += chunk; | ||||
|                 } | ||||
|             }) | ||||
|             .on("end", () => resolve(content)) | ||||
|             .on("error", reject); | ||||
|     }); | ||||
| } | ||||
|  | ||||
| /** | ||||
|  * Get the error message of a given value. | ||||
|  * @param {any} error The value to get. | ||||
|  * @returns {string} The error message. | ||||
|  */ | ||||
| function getErrorMessage(error) { | ||||
|  | ||||
|     // Lazy loading because this is used only if an error happened. | ||||
|     const util = require("util"); | ||||
|  | ||||
|     // Foolproof -- third-party module might throw non-object. | ||||
|     if (typeof error !== "object" || error === null) { | ||||
|         return String(error); | ||||
|     } | ||||
|  | ||||
|     // Use templates if `error.messageTemplate` is present. | ||||
|     if (typeof error.messageTemplate === "string") { | ||||
|         try { | ||||
|             const template = require(`../messages/${error.messageTemplate}.js`); | ||||
|  | ||||
|             return template(error.messageData || {}); | ||||
|         } catch { | ||||
|  | ||||
|             // Ignore template error then fallback to use `error.stack`. | ||||
|         } | ||||
|     } | ||||
|  | ||||
|     // Use the stacktrace if it's an error object. | ||||
|     if (typeof error.stack === "string") { | ||||
|         return error.stack; | ||||
|     } | ||||
|  | ||||
|     // Otherwise, dump the object. | ||||
|     return util.format("%o", error); | ||||
| } | ||||
|  | ||||
| /** | ||||
|  * Tracks error messages that are shown to the user so we only ever show the | ||||
|  * same message once. | ||||
|  * @type {Set<string>} | ||||
|  */ | ||||
| const displayedErrors = new Set(); | ||||
|  | ||||
| /** | ||||
|  * Tracks whether an unexpected error was caught | ||||
|  * @type {boolean} | ||||
|  */ | ||||
| let hadFatalError = false; | ||||
|  | ||||
| /** | ||||
|  * Catch and report unexpected error. | ||||
|  * @param {any} error The thrown error object. | ||||
|  * @returns {void} | ||||
|  */ | ||||
| function onFatalError(error) { | ||||
|     process.exitCode = 2; | ||||
|     hadFatalError = true; | ||||
|  | ||||
|     const { version } = require("../package.json"); | ||||
|     const message = ` | ||||
| Oops! Something went wrong! :( | ||||
|  | ||||
| ESLint: ${version} | ||||
|  | ||||
| ${getErrorMessage(error)}`; | ||||
|  | ||||
|     if (!displayedErrors.has(message)) { | ||||
|         console.error(message); | ||||
|         displayedErrors.add(message); | ||||
|     } | ||||
| } | ||||
|  | ||||
| //------------------------------------------------------------------------------ | ||||
| // Execution | ||||
| //------------------------------------------------------------------------------ | ||||
|  | ||||
| (async function main() { | ||||
|     process.on("uncaughtException", onFatalError); | ||||
|     process.on("unhandledRejection", onFatalError); | ||||
|  | ||||
|     // Call the config initializer if `--init` is present. | ||||
|     if (process.argv.includes("--init")) { | ||||
|  | ||||
|         // `eslint --init` has been moved to `@eslint/create-config` | ||||
|         console.warn("You can also run this command directly using 'npm init @eslint/config'."); | ||||
|  | ||||
|         const spawn = require("cross-spawn"); | ||||
|  | ||||
|         spawn.sync("npm", ["init", "@eslint/config"], { encoding: "utf8", stdio: "inherit" }); | ||||
|         return; | ||||
|     } | ||||
|  | ||||
|     // Otherwise, call the CLI. | ||||
|     const exitCode = await require("../lib/cli").execute( | ||||
|         process.argv, | ||||
|         process.argv.includes("--stdin") ? await readStdin() : null, | ||||
|         true | ||||
|     ); | ||||
|  | ||||
|     /* | ||||
|      * If an uncaught exception or unhandled rejection was detected in the meantime, | ||||
|      * keep the fatal exit code 2 that is already assigned to `process.exitCode`. | ||||
|      * Without this condition, exit code 2 (unsuccessful execution) could be overwritten with | ||||
|      * 1 (successful execution, lint problems found) or even 0 (successful execution, no lint problems found). | ||||
|      * This ensures that unexpected errors that seemingly don't affect the success | ||||
|      * of the execution will still cause a non-zero exit code, as it's a common | ||||
|      * practice and the default behavior of Node.js to exit with non-zero | ||||
|      * in case of an uncaught exception or unhandled rejection. | ||||
|      * | ||||
|      * Otherwise, assign the exit code returned from CLI. | ||||
|      */ | ||||
|     if (!hadFatalError) { | ||||
|         process.exitCode = exitCode; | ||||
|     } | ||||
| }()).catch(onFatalError); | ||||
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