fastload - Allow redirecting to launcher for back function of setUI

apps/fastload/boot.js

@@ -1,4 +1,6 @@
 {
+const SETTINGS = require("Storage").readJSON("fastload.json") || {};
+
 let loadingScreen = function(){
   g.reset();
 
@@ -14,9 +16,58 @@ let loadingScreen = function(){
   g.flip(true);
 };
 
-// only needed to show "Fastloading..." on starting the launcher
+let cache = require("Storage").readJSON("fastload.cache") || {};
+
+function checkApp(n){
+  print("checking", n);
+  // no widgets, no problem
+  if (!global.WIDGETS) return true;
+  let app = require("Storage").read(n);
+  if (cache[n] && E.CRC32(app) == cache[n].crc)
+    return cache[n].fast
+  cache[n] = {};
+  cache[n].fast = app.includes("Bangle.loadWidgets");
+  cache[n].crc = E.CRC32(app);
+  require("Storage").writeJSON("fastload.cache", cache);
+  print("updated cache", cache[n]);
+  return cache[n].fast;
+}
+
+global._load = load;
+
+function slowload(n){
+  print("slowload", n);
+  global._load(n);
+}
+
+function fastload(n){
+  print("fastload", n)
+  if (!n || checkApp(n)){
+    print("actually try fastloading using Bangle.load");
+    // Bangle.load can call load, to prevent recursion this must be the system load
+    global.load = slowload;
+    Bangle.load(n);
+    // if fastloading worked, we need to set load back to this method
+    global.load = fastload;
+  }
+  else
+    slowload(n);
+};
+global.load = fastload;
+
 Bangle.load = (o => (name) => {
+  print("Bangle.load", name);
   if (Bangle.uiRemove) loadingScreen();
-  setTimeout(o,0,name);
+  if (SETTINGS.autoloadLauncher && !name){
+    print("redirect to launcher");
+    let orig = Bangle.load;
+    Bangle.load = (n)=>{
+      Bangle.load = orig;
+      fastload(n);
+    }
+    Bangle.showLauncher();
+    Bangle.load = orig;
+  } else 
+    o(name);
 })(Bangle.load);
 }