feat: "my files" tab to list and download files

comms.js

@@ -95,5 +95,35 @@ watchConnectionChange : cb => {
   return () => {
     clearInterval(interval);
   };
+},
+listFiles : () => {
+  return new Promise((resolve,reject) => {
+    Puck.write("\x03",(result) => {
+      if (result===null) return reject("");
+      //use encodeURIComponent to serialize octal sequence of append files
+      Puck.eval('require("Storage").list().map(encodeURIComponent)', (files,err) => {
+        if (files===null) return reject(err || "");
+        files = files.map(decodeURIComponent);
+        console.log("listFiles", files);
+        resolve(files);
+      });
+    });
+  });
+},
+readFile : (file) => {
+  return new Promise((resolve,reject) => {
+    //encode name to avoid serialization issue due to octal sequence
+    const name = encodeURIComponent(file);
+    Puck.write("\x03",(result) => {
+      if (result===null) return reject("");
+      //TODO: big files will not fit in RAM. 
+      //we should loop and read chunks one by one.
+      //Use btoa for binary content
+      Puck.eval(`btoa(require("Storage").read(decodeURIComponent("${name}"))))`, (content,err) => {
+        if (content===null) return reject(err || "");
+        resolve(atob(content));
+      });
+    });
+  });
 }
 };

index.html

@@ -56,6 +56,9 @@
       <li class="tab-item" id="tab-myappscontainer">
         <a href="javascript:showTab('myappscontainer')">My Apps</a>
       </li>
+      <li class="tab-item" id="tab-myfscontainer">
+        <a href="javascript:showTab('myfscontainer')">My files</a>
+      </li>
       <li class="tab-item" id="tab-aboutcontainer">
         <a href="javascript:showTab('aboutcontainer')">About</a>
       </li>
@@ -87,12 +90,27 @@
     <div class="container bangle-tab" id="myappscontainer" style="display:none">
       <div class="panel">
         <div class="panel-header" style="text-align:right">
-          <button class="btn" id="myappsrefresh">Refresh...</button>
+          <button class="btn refresh">Refresh...</button>
         </div>
         <div class="panel-body columns"><!-- apps go here --></div>
       </div>
     </div>
 
+    <div class="container bangle-tab" id="myfscontainer" style="display:none">
+      <div class="panel">
+        <div class="panel-header column col-12 container">
+          <div class="columns col-gapless">
+            <p class="column col-9">Files currently stored on the watch. Click row to download.</p>
+            <div class="column col-3" style="text-align:right">
+              <button class="btn refresh">Refresh...</button>
+            </div>
+          </div>
+        </div>
+        <table class="table table-striped table-hover panel-body">
+        </table>
+      </div>
+    </div>
+
     <div class="container bangle-tab" id="aboutcontainer" style="display:none">
       <div class="hero bg-gray">
         <div class="hero-body">
@@ -117,5 +135,6 @@
     <script src="comms.js"></script>
     <script src="appinfo.js"></script>
     <script src="index.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/file-saver@2.0.2/dist/FileSaver.min.js" type="application/javascript"></script>
   </body>
 </html>

index.js

@@ -1,5 +1,6 @@
 var appJSON = []; // List of apps and info from apps.json
 var appsInstalled = []; // list of app JSON
+var files = []; // list of files on Bangle
 
 httpGet("apps.json").then(apps=>{
   try {
@@ -264,9 +265,9 @@ function appNameToApp(appName) {
   };
 }
 
-function showLoadingIndicator() {
-  var panelbody = document.querySelector("#myappscontainer .panel-body");
-  var tab = document.querySelector("#tab-myappscontainer a");
+function showLoadingIndicator(id) {
+  var panelbody = document.querySelector(`#${id} .panel-body`);
+  var tab = document.querySelector(`#tab-${id} a`);
   // set badge up top
   tab.classList.add("badge");
   tab.setAttribute("data-badge", "");
@@ -313,14 +314,21 @@ return `<div class="tile column col-6 col-sm-12 col-xs-12">
 }
 
 function getInstalledApps() {
-  showLoadingIndicator();
-  // Get apps
-  return Comms.getInstalledApps().then(appJSON => {
+  showLoadingIndicator("myappscontainer");
+  showLoadingIndicator("myfscontainer");
+  // Get apps and files
+  return Comms.getInstalledApps()
+    .then(appJSON => {
       appsInstalled = appJSON;
-    handleConnectionChange(true);
       refreshMyApps();
       refreshLibrary();
-  });
+    })
+    .then(Comms.listFiles)
+    .then(list => {
+      files = list;
+      refreshMyFS();
+    })
+    .then(() => handleConnectionChange(true));
 }
 
 var connectMyDeviceBtn = document.getElementById("connectmydevice");
@@ -330,11 +338,11 @@ function handleConnectionChange(connected) {
   connectMyDeviceBtn.classList.toggle('is-connected', connected);
 }
 
-document.getElementById("myappsrefresh").addEventListener("click", () => {
+htmlToArray(document.querySelectorAll(".btn.refresh")).map(button => button.addEventListener("click", () => {
   getInstalledApps().catch(err => {
     showToast("Getting app list failed, "+err,"error");
   });
-});
+}));
 connectMyDeviceBtn.addEventListener("click", () => {
   if (connectMyDeviceBtn.classList.contains('is-connected')) {
     Comms.disconnectDevice();
@@ -364,6 +372,45 @@ librarySearchInput.addEventListener('input', evt => {
   refreshLibrary();
 });
 
+
+// =========================================== My Files
+
+function refreshMyFS() {
+  var panelbody = document.querySelector("#myfscontainer .panel-body");
+  var tab = document.querySelector("#tab-myfscontainer a");
+  tab.setAttribute("data-badge", files.length);
+  panelbody.innerHTML = `
+    <thead>
+      <tr>
+        <th>Name</th>
+        <th>Type</th>
+      </tr>
+    </thead>
+    <tbody>${
+    files.map(file =>
+      `<tr data-name="${file}"><td>${escapeHtml(file)}</td><td>${fileType(file).name}</td></li>`
+    ).join("")}
+    </tbody>`;
+
+  htmlToArray(panelbody.getElementsByTagName("tr")).forEach(row => {
+    row.addEventListener("click",event => {
+      var name = event.target.closest('tr').dataset.name;
+      const type = fileType(name);
+      Comms.readFile(name).then(content => content.length && saveAs(new Blob([content], type), name));
+    });
+  });
+}
+
+function fileType(file) {
+  switch (file[0]) {
+    case "+": return { name: "App descriptor", type: "application/json;charset=utf-8" };
+    case "*": return { name: "App icon", type: "text/plain;charset=utf-8" };
+    case "-": return { name: "App code", type: "application/javascript;charset=utf-8" };
+    case "=": return { name: "Boot-time code", type: "application/javascript;charset=utf-8" };
+    default: return { name: "Plain", type: "text/plain;charset=utf-8" };
+  }
+}
+
 // =========================================== About
 
 document.getElementById("settime").addEventListener("click",event=>{