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/**
* @fileoverview Utility for executing npm commands.
* @author Ian VanSchooten
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const fs = require("fs"),
spawn = require("cross-spawn"),
path = require("path"),
log = require("./logging");
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Find the closest package.json file, starting at process.cwd (by default),
* and working up to root.
*
* @param {string} [startDir=process.cwd()] Starting directory
* @returns {string} Absolute path to closest package.json file
*/
function findPackageJson(startDir) {
let dir = path.resolve(startDir || process.cwd());
do {
const pkgFile = path.join(dir, "package.json");
if (!fs.existsSync(pkgFile) || !fs.statSync(pkgFile).isFile()) {
dir = path.join(dir, "..");
continue;
}
return pkgFile;
} while (dir !== path.resolve(dir, ".."));
return null;
}
//------------------------------------------------------------------------------
// Private
//------------------------------------------------------------------------------
/**
* Install node modules synchronously and save to devDependencies in package.json
* @param {string|string[]} packages Node module or modules to install
* @returns {void}
*/
function installSyncSaveDev(packages) {
const packageList = Array.isArray(packages) ? packages : [packages];
const npmProcess = spawn.sync("npm", ["i", "--save-dev"].concat(packageList),
{ stdio: "inherit" });
const error = npmProcess.error;
if (error && error.code === "ENOENT") {
const pluralS = packageList.length > 1 ? "s" : "";
log.error(`Could not execute npm. Please install the following package${pluralS} with a package manager of your choice: ${packageList.join(", ")}`);
}
}
/**
* Fetch `peerDependencies` of the given package by `npm show` command.
* @param {string} packageName The package name to fetch peerDependencies.
* @returns {Object} Gotten peerDependencies. Returns null if npm was not found.
*/
function fetchPeerDependencies(packageName) {
const npmProcess = spawn.sync(
"npm",
["show", "--json", packageName, "peerDependencies"],
{ encoding: "utf8" }
);
const error = npmProcess.error;
if (error && error.code === "ENOENT") {
return null;
}
const fetchedText = npmProcess.stdout.trim();
return JSON.parse(fetchedText || "{}");
}
/**
* Check whether node modules are include in a project's package.json.
*
* @param {string[]} packages Array of node module names
* @param {Object} opt Options Object
* @param {boolean} opt.dependencies Set to true to check for direct dependencies
* @param {boolean} opt.devDependencies Set to true to check for development dependencies
* @param {boolean} opt.startdir Directory to begin searching from
* @returns {Object} An object whose keys are the module names
* and values are booleans indicating installation.
*/
function check(packages, opt) {
let deps = [];
const pkgJson = (opt) ? findPackageJson(opt.startDir) : findPackageJson();
let fileJson;
if (!pkgJson) {
throw new Error("Could not find a package.json file. Run 'npm init' to create one.");
}
try {
fileJson = JSON.parse(fs.readFileSync(pkgJson, "utf8"));
} catch (e) {
const error = new Error(e);
error.messageTemplate = "failed-to-read-json";
error.messageData = {
path: pkgJson,
message: e.message
};
throw error;
}
if (opt.devDependencies && typeof fileJson.devDependencies === "object") {
deps = deps.concat(Object.keys(fileJson.devDependencies));
}
if (opt.dependencies && typeof fileJson.dependencies === "object") {
deps = deps.concat(Object.keys(fileJson.dependencies));
}
return packages.reduce((status, pkg) => {
status[pkg] = deps.indexOf(pkg) !== -1;
return status;
}, {});
}
/**
* Check whether node modules are included in the dependencies of a project's
* package.json.
*
* Convienience wrapper around check().
*
* @param {string[]} packages Array of node modules to check.
* @param {string} rootDir The directory contianing a package.json
* @returns {Object} An object whose keys are the module names
* and values are booleans indicating installation.
*/
function checkDeps(packages, rootDir) {
return check(packages, { dependencies: true, startDir: rootDir });
}
/**
* Check whether node modules are included in the devDependencies of a project's
* package.json.
*
* Convienience wrapper around check().
*
* @param {string[]} packages Array of node modules to check.
* @returns {Object} An object whose keys are the module names
* and values are booleans indicating installation.
*/
function checkDevDeps(packages) {
return check(packages, { devDependencies: true });
}
/**
* Check whether package.json is found in current path.
*
* @param {string=} startDir Starting directory
* @returns {boolean} Whether a package.json is found in current path.
*/
function checkPackageJson(startDir) {
return !!findPackageJson(startDir);
}
//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------
module.exports = {
installSyncSaveDev,
fetchPeerDependencies,
checkDeps,
checkDevDeps,
checkPackageJson
};