2 * @fileoverview Utility to get information about the execution environment.
8 //------------------------------------------------------------------------------
10 //------------------------------------------------------------------------------
12 const path = require("path");
13 const spawn = require("cross-spawn");
14 const os = require("os");
15 const log = require("../shared/logging");
16 const packageJson = require("../../package.json");
18 //------------------------------------------------------------------------------
20 //------------------------------------------------------------------------------
23 * Generates and returns execution environment information.
24 * @returns {string} A string that contains execution environment information.
26 function environment() {
27 const cache = new Map();
30 * Checks if a path is a child of a directory.
31 * @param {string} parentPath The parent path to check.
32 * @param {string} childPath The path to check.
33 * @returns {boolean} Whether or not the given path is a child of a directory.
35 function isChildOfDirectory(parentPath, childPath) {
36 return !path.relative(parentPath, childPath).startsWith("..");
40 * Synchronously executes a shell command and formats the result.
41 * @param {string} cmd The command to execute.
42 * @param {Array} args The arguments to be executed with the command.
43 * @returns {string} The version returned by the command.
45 function execCommand(cmd, args) {
46 const key = [cmd, ...args].join(" ");
49 return cache.get(key);
52 const process = spawn.sync(cmd, args, { encoding: "utf8" });
58 const result = process.stdout.trim();
60 cache.set(key, result);
65 * Normalizes a version number.
66 * @param {string} versionStr The string to normalize.
67 * @returns {string} The normalized version number.
69 function normalizeVersionStr(versionStr) {
70 return versionStr.startsWith("v") ? versionStr : `v${versionStr}`;
75 * @param {string} bin The bin to check.
76 * @returns {string} The normalized version returned by the command.
78 function getBinVersion(bin) {
79 const binArgs = ["--version"];
82 return normalizeVersionStr(execCommand(bin, binArgs));
84 log.error(`Error finding ${bin} version running the command \`${bin} ${binArgs.join(" ")}\``);
90 * Gets installed npm package version.
91 * @param {string} pkg The package to check.
92 * @param {boolean} global Whether to check globally or not.
93 * @returns {string} The normalized version returned by the command.
95 function getNpmPackageVersion(pkg, { global = false } = {}) {
96 const npmBinArgs = ["bin", "-g"];
97 const npmLsArgs = ["ls", "--depth=0", "--json", "eslint"];
100 npmLsArgs.push("-g");
104 const parsedStdout = JSON.parse(execCommand("npm", npmLsArgs));
107 * Checking globally returns an empty JSON object, while local checks
108 * include the name and version of the local project.
110 if (Object.keys(parsedStdout).length === 0 || !(parsedStdout.dependencies && parsedStdout.dependencies.eslint)) {
114 const [, processBinPath] = process.argv;
118 npmBinPath = execCommand("npm", npmBinArgs);
120 log.error(`Error finding npm binary path when running command \`npm ${npmBinArgs.join(" ")}\``);
124 const isGlobal = isChildOfDirectory(npmBinPath, processBinPath);
125 let pkgVersion = parsedStdout.dependencies.eslint.version;
127 if ((global && isGlobal) || (!global && !isGlobal)) {
128 pkgVersion += " (Currently used)";
131 return normalizeVersionStr(pkgVersion);
133 log.error(`Error finding ${pkg} version running the command \`npm ${npmLsArgs.join(" ")}\``);
141 `Node version: ${getBinVersion("node")}`,
142 `npm version: ${getBinVersion("npm")}`,
143 `Local ESLint version: ${getNpmPackageVersion("eslint", { global: false })}`,
144 `Global ESLint version: ${getNpmPackageVersion("eslint", { global: true })}`,
145 `Operating System: ${os.platform()} ${os.release()}`
150 * Returns version of currently executing ESLint.
151 * @returns {string} The version from the currently executing ESLint's package.json.
154 return `v${packageJson.version}`;
157 //------------------------------------------------------------------------------
159 //------------------------------------------------------------------------------