Feature: add offline mode (#260)

* add options for offline mode

* add option for a custom download directory

lib/buildSystem.js

@@ -3,6 +3,7 @@ let CMake = require("./cMake");
 let Dist = require("./dist");
 let CMLog = require("./cmLog");
 let appCMakeJSConfig = require("./appCMakeJSConfig");
+let npmConfig = require("./npmConfig");
 let path = require("path");
 let _ = require("lodash");
 let Toolset = require("./toolset");
@@ -12,6 +13,11 @@ function BuildSystem(options) {
     this.options.directory = path.resolve(this.options.directory || process.cwd());
     this.log = new CMLog(this.options);
     let appConfig = appCMakeJSConfig(this.options.directory, this.log);
+    let npmOptions = npmConfig(this.log);
+
+    if (_.isPlainObject(npmOptions) && _.keys(npmOptions).length) {
+        this.options.runtimeDirectory = npmOptions["nodedir"];
+    }
     if (_.isPlainObject(appConfig)) {
         if (_.keys(appConfig).length) {
             this.log.verbose("CFG", "Applying CMake.js config from root package.json:");

lib/dist.js

@@ -30,11 +30,15 @@ function Dist(options) {
 Object.defineProperties(Dist.prototype, {
     internalPath: {
         get: function () {
-            return path.join(
-                environment.home,
-                ".cmake-js",
-                (this.targetOptions.runtime) + "-" + this.targetOptions.arch,
-                "v" + this.targetOptions.runtimeVersion);
+            let cacheDirectory =  ".cmake-js";
+            let runtimeArchDirectory = (this.targetOptions.runtime) + "-" + this.targetOptions.arch;
+            let runtimeVersionDirectory = "v" + this.targetOptions.runtimeVersion;
+
+            return this.options.runtimeDirectory ||
+                path.join(environment.home,
+                    cacheDirectory,
+                    runtimeArchDirectory,
+                    runtimeVersionDirectory);
         }
     },
     externalPath: {
@@ -107,7 +111,7 @@ Dist.prototype.ensureDownloaded = async function () {
 
 Dist.prototype.download = async function () {
     let log = this.log;
-    log.info("DIST", "Downloading distribution files.");
+    log.info("DIST", "Downloading distribution files to: " + this.internalPath);
     await fs.ensureDir(this.internalPath);
     let sums = await this._downloadShaSums();
     await Promise.all([this._downloadLibs(sums), this._downloadTar(sums)]);

lib/npmConfig.js

@@ -0,0 +1,31 @@
+"use strict";
+
+function getNpmConfig() {
+    let npmOptions = {};
+    let npmConfigPrefix = 'npm_config_'
+    Object.keys(process.env).forEach(function (name) {
+        if (name.indexOf(npmConfigPrefix) !== 0) {
+            return
+        }
+        let value = process.env[name]
+        name = name.substring(npmConfigPrefix.length)
+        if (name) {
+            npmOptions[name] = value
+        }
+    }, this)
+
+    return npmOptions;
+}
+
+module.exports = function (log) {
+    log.verbose("CFG", "Looking for NPM config.");
+    let options = getNpmConfig();
+
+    if (options) {
+        log.silly("CFG", "NPM options:", options);
+    }else {
+        log.verbose("CFG", "There are no NPM options available.");
+    }
+
+    return options;
+};