added simple reloading development server

.gitignore

@@ -1,4 +1,6 @@
 *.log
 .cache
 .DS_Store
+*~
 build
+node_modules

README.md

@@ -6,3 +6,12 @@ Tenants of this design:
 - K.I.S.S.
 - Go slow and fix things.
 - Mobile first and all that entails.
+
+## Build
+```node build.js```
+
+## Develop
+```node dev-server.js```
+or
+```nodemon dev-server.js```
+for live-reloading

build.js

@@ -47,14 +47,14 @@ files.forEach( file => {
 });
 
 fs.cp('./src/styles','./build/styles', { recursive: true }, (err) => {
- 	if (err) throw err;
+	if (err) throw err;
 });
 
 
 function ensureDirectoryExists(filePath) {
     var dirname = filePath.split('/').slice(0,-1).join('/');
-    if (fs.existsSync(dirname)) {
+    if (fs.existsSync("./" + dirname)) {
-		return true;
+	return true;
     }
     ensureDirectoryExists(dirname);
     fs.mkdirSync(dirname);

client-websocket.js

@@ -0,0 +1,35 @@
+/**
+ * @file site/client-websocket.js
+ */
+(()=>{
+  const socketUrl = 'ws://localhost:8090';
+  let socket = new WebSocket(socketUrl);
+  socket.addEventListener('close',()=>{
+    // Then the server has been turned off,
+    // either due to file-change-triggered reboot,
+    // or to truly being turned off.
+
+    // Attempt to re-establish a connection until it works,
+    // failing after a few seconds (at that point things are likely
+    // turned off/permanantly broken instead of rebooting)
+    const interAttemptTimeoutMilliseconds = 100;
+    const maxDisconnectedTimeMilliseconds = 3000;
+    const maxAttempts = Math.round(maxDisconnectedTimeMilliseconds/interAttemptTimeoutMilliseconds);
+    let attempts = 0;
+    const reloadIfCanConnect = ()=>{
+      attempts ++ ;
+      if(attempts > maxAttempts){
+        console.error("Could not reconnect to dev server.");
+        return;
+      }
+      socket = new WebSocket(socketUrl);
+      socket.addEventListener('error',()=>{
+        setTimeout(reloadIfCanConnect,interAttemptTimeoutMilliseconds);
+      });
+      socket.addEventListener('open',()=>{
+        location.reload();
+      });
+    };
+    reloadIfCanConnect();
+  });
+})();

dev-server.js

@@ -0,0 +1,75 @@
+const http = require('http');
+const fs = require('fs');
+const path = require('path');
+const WebSocket = require('ws');
+const buildScript = require('./build.js'); //run the build script before serving
+
+const HTTP_PORT = 8089;
+const WEBSOCKET_PORT = 8090;
+const CLIENT_WEBSOCKET_CODE = fs.readFileSync(path.join(__dirname,'client-websocket.js'),'utf8');
+
+console.log(`Starting dev server on port http://localhost:${HTTP_PORT}`);
+
+// Websocket server (for allowing browser and dev server to have 2-way communication)
+// We don't even need to do anything except create the instance!
+const wss = new WebSocket.Server({
+  port: WEBSOCKET_PORT
+});
+
+/**
+ * @typedef {import('http').IncomingMessage} req
+ * @typedef {import('http').ServerResponse} res
+*/
+
+/** Use classic server-logic to serve a static file (e.g. default to 'index.html' etc)
+ * @param {string} route
+ * @param {res} res
+ * @returns {boolean} Whether or not the page exists and was served
+ */
+function serveStaticPageIfExists(route,res) {
+  // We don't care about performance for a dev server, so sync functions are fine.
+  // If the route exists it's either the exact file we want or the path to a directory
+  // in which case we'd serve up the 'index.html' file.
+  if(fs.existsSync(route)){
+    if(fs.statSync(route).isDirectory()){
+      return serveStaticPageIfExists(path.join(route,'index.html'),res);
+    }
+    else if(fs.statSync(route).isFile()){
+      res.writeHead(200);
+      /** @type {string|Buffer} */
+      let file = fs.readFileSync(route);
+      if(route.endsWith('.html')){
+        // Inject the client-side websocket code.
+        // This sounds fancier than it is; simply
+        // append the script to the end since
+        // browsers allow for tons of deviation
+        // from *technically correct* HTML.
+        file = `${file.toString()}\n\n<script>${CLIENT_WEBSOCKET_CODE}</script>`;
+      }
+      res.end(file);
+      return true;
+    }
+  }
+  return false;
+}
+
+/** General request handler and router
+ * @param {req} req
+ * @param {res} res
+*/
+const requestHandler = function (req, res) {
+  const method = req.method.toLowerCase();
+  if(method=='get'){
+    // No need to ensure the route can't access other local files,
+    // since this is for development only.
+    const route = path.normalize(path.join(__dirname,'build',req.url));
+    if(serveStaticPageIfExists(route,res)){
+      return;
+    }
+  }
+  res.writeHead(404);
+  res.end();
+}
+
+const server = http.createServer(requestHandler);
+server.listen(HTTP_PORT);

package-lock.json

@@ -0,0 +1,414 @@
+{
+  "name": "jhan.com.au",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "devDependencies": {
+        "nodemon": "^3.0.1",
+        "ws": "^8.14.2"
+      }
+    },
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+      "dev": true
+    },
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+      "dev": true,
+      "dependencies": {
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+        "picomatch": "^2.0.4"
+      },
+      "engines": {
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+      }
+    },
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+      "dev": true,
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+          "url": "https://paulmillr.com/funding/"
+        }
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+}

package.json

@@ -0,0 +1,12 @@
+{
+  "devDependencies": {
+    "nodemon": "^3.0.1",
+    "ws": "^8.14.2"
+  },
+  "nodemonConfig": {
+    "watch": ["src/"],
+    "ext": "*.html, *.css",
+    "verbose": "true",
+    "delay": 2500
+  }
+}