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108 lines
3.5 KiB
108 lines
3.5 KiB
#!/usr/bin/env node
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/**
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* @fileoverview Main CLI that is run via the eslint command.
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* @author Nicholas C. Zakas
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*/
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/* eslint no-console:off */
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"use strict";
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// to use V8's code cache to speed up instantiation time
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require("v8-compile-cache");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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const useStdIn = process.argv.includes("--stdin"),
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init = process.argv.includes("--init"),
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debug = process.argv.includes("--debug");
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// must do this initialization *before* other requires in order to work
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if (debug) {
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require("debug").enable("eslint:*,-eslint:code-path");
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}
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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// now we can safely include the other modules that use debug
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const path = require("path"),
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fs = require("fs"),
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cli = require("../lib/cli");
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//------------------------------------------------------------------------------
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// Execution
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//------------------------------------------------------------------------------
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process.once("uncaughtException", err => {
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// lazy load
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const lodash = require("lodash");
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if (typeof err.messageTemplate === "string" && err.messageTemplate.length > 0) {
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const template = lodash.template(fs.readFileSync(path.resolve(__dirname, `../messages/${err.messageTemplate}.txt`), "utf-8"));
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const pkg = require("../package.json");
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console.error("\nOops! Something went wrong! :(");
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console.error(`\nESLint: ${pkg.version}.\n\n${template(err.messageData || {})}`);
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} else {
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console.error(err.stack);
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}
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process.exitCode = 2;
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});
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if (useStdIn) {
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/*
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* Note: See
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* - https://github.com/nodejs/node/blob/master/doc/api/process.md#processstdin
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* - https://github.com/nodejs/node/blob/master/doc/api/process.md#a-note-on-process-io
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* - https://lists.gnu.org/archive/html/bug-gnu-emacs/2016-01/msg00419.html
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* - https://github.com/nodejs/node/issues/7439 (historical)
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*
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* On Windows using `fs.readFileSync(STDIN_FILE_DESCRIPTOR, "utf8")` seems
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* to read 4096 bytes before blocking and never drains to read further data.
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*
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* The investigation on the Emacs thread indicates:
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*
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* > Emacs on MS-Windows uses pipes to communicate with subprocesses; a
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* > pipe on Windows has a 4K buffer. So as soon as Emacs writes more than
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* > 4096 bytes to the pipe, the pipe becomes full, and Emacs then waits for
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* > the subprocess to read its end of the pipe, at which time Emacs will
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* > write the rest of the stuff.
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*
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* Using the nodejs code example for reading from stdin.
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*/
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let contents = "",
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chunk = "";
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process.stdin.setEncoding("utf8");
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process.stdin.on("readable", () => {
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// Use a loop to make sure we read all available data.
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while ((chunk = process.stdin.read()) !== null) {
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contents += chunk;
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}
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});
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process.stdin.on("end", () => {
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process.exitCode = cli.execute(process.argv, contents, "utf8");
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});
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} else if (init) {
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const configInit = require("../lib/init/config-initializer");
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configInit.initializeConfig().then(() => {
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process.exitCode = 0;
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}).catch(err => {
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process.exitCode = 1;
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console.error(err.message);
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console.error(err.stack);
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});
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} else {
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process.exitCode = cli.execute(process.argv);
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}
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