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#!/usr/bin/env node
/**
* @fileoverview Main CLI that is run via the eslint command.
* @author Nicholas C. Zakas
*/
/* eslint no-console:off */
"use strict";
// to use V8's code cache to speed up instantiation time
require("v8-compile-cache");
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
const useStdIn = process.argv.includes("--stdin"),
init = process.argv.includes("--init"),
debug = process.argv.includes("--debug");
// must do this initialization *before* other requires in order to work
if (debug) {
require("debug").enable("eslint:*,-eslint:code-path");
}
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
// now we can safely include the other modules that use debug
const path = require("path"),
fs = require("fs"),
cli = require("../lib/cli");
//------------------------------------------------------------------------------
// Execution
//------------------------------------------------------------------------------
process.once("uncaughtException", err => {
// lazy load
const lodash = require("lodash");
if (typeof err.messageTemplate === "string" && err.messageTemplate.length > 0) {
const template = lodash.template(fs.readFileSync(path.resolve(__dirname, `../messages/${err.messageTemplate}.txt`), "utf-8"));
const pkg = require("../package.json");
console.error("\nOops! Something went wrong! :(");
console.error(`\nESLint: ${pkg.version}.\n\n${template(err.messageData || {})}`);
} else {
console.error(err.stack);
}
process.exitCode = 2;
});
if (useStdIn) {
/*
* 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.
*
* Using the nodejs code example for reading from stdin.
*/
let contents = "",
chunk = "";
process.stdin.setEncoding("utf8");
process.stdin.on("readable", () => {
// Use a loop to make sure we read all available data.
while ((chunk = process.stdin.read()) !== null) {
contents += chunk;
}
});
process.stdin.on("end", () => {
process.exitCode = cli.execute(process.argv, contents, "utf8");
});
} else if (init) {
const configInit = require("../lib/init/config-initializer");
configInit.initializeConfig().then(() => {
process.exitCode = 0;
}).catch(err => {
process.exitCode = 1;
console.error(err.message);
console.error(err.stack);
});
} else {
process.exitCode = cli.execute(process.argv);
}