make npm run watch run the server

Gruntfile.js

@@ -9,10 +9,13 @@ process.on('unhandledRejection', up => {
 
 const fs = require('fs');
 const path = require('path');
+const c = require('ansi-colors');
 const liveEditor = require('@gfxfundamentals/live-editor');
 const fixLinks = require('./build/fix-links.js');
 const liveEditorPath = path.dirname(require.resolve('@gfxfundamentals/live-editor'));
 const webgpuTypesPath = path.join(__dirname, 'node_modules', '@webgpu', 'types');
+const dataDir = require('./build/appdata')('servez-cli');
+const Servez = require('servez-lib');
 
 module.exports = function(grunt) {
 
@@ -189,8 +192,41 @@ module.exports = function(grunt) {
     buildStuff(buildSettings).finally(finish);
   });
 
+  grunt.registerTask('serve', function() {
+    //const done = this.async();
+    const logger = {
+      log: console.log,
+      error: console.error,
+      c,
+    };
+    const hosts = [];
+
+    console.log('startServer');
+    const server = new Servez(Object.assign({
+      root: path.join(__dirname, 'out'),
+      dataDir,
+      logger,
+    }, {
+      port: 8080,
+      scan: true,
+      index: true,
+      extensions: ['html'],
+    }));
+    server.on('host', function(...args) {
+      const localRE = /\D0\.0\.0\.0.\D|\D127\.0\.0\.|\Wlocalhost\W/;
+      const [data] = args;
+      const {root} = data;
+      if (!localRE.test(root)) {
+        hosts.push(root);
+      }
+    });
+    server.on('start', function() {
+      console.log('press CTRL-C to stop the server.');
+    });
+  });
+
   grunt.registerTask('build', ['clean', 'copy:main', 'buildlessons']);
-  grunt.registerTask('buildwatch', ['build', 'watch']);
+  grunt.registerTask('buildwatch', ['build', 'serve', 'watch']);
 
   grunt.registerTask('default', ['eslint', 'build']);
 };

build/appdata.js

@@ -0,0 +1,75 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+/*eslint-env node*/
+
+// eslint-disable-next-line strict
+'use strict';
+
+/*
+Copyright 2018, Greggman.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Greggman. nor the names of their
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+const fs = require('fs');
+const path = require('path');
+
+function mkdir(dirPath) {
+  if (!fileExists(dirPath)) {
+    fs.mkdirSync(dirPath);
+  }
+}
+
+function getDataDirPath(dirName) {
+  if (process.platform.toLowerCase() === 'darwin') {
+    return path.join(process.env.HOME, 'Library', 'Application Support', dirName);
+  } else if (process.platform.substring(0, 3).toLowerCase() === 'win') {
+    return path.join(process.env.LOCALAPPDATA || process.env.APPDATA, dirName);
+  } else {
+    //const configDir = path.join(process.env.HOME, '.config');
+    return path.join(process.env.HOME, dirName);
+  }
+}
+
+function fileExists(filename) {
+  try {
+    const stat = fs.statSync(filename);
+    return !!stat;
+  } catch (e) {
+    return false;
+  }
+}
+
+function getDataDir(dirName) {
+  const dataDir = getDataDirPath(dirName);
+  mkdir(dataDir);
+  return dataDir;
+}
+
+module.exports = getDataDir;