iconlaunch - Cache apps for faster start

apps/iconlaunch/app.js

@@ -5,34 +5,24 @@
     Bangle.loadWidgets();
     Bangle.drawWidgets();
   }
-  var apps = s
-    .list(/\.info$/)
-    .map((app) => {
-    var a = s.readJSON(app, 1);
-      return (
-        a && {
-      name: a.name,
-      type: a.type,
-      icon: a.icon,
-      sortorder: a.sortorder,
-      src: a.src,
-        }
-      );
-    })
-    .filter(
-      (app) =>
-      app &&
-      (app.type == "app" ||
-        (app.type == "clock" && settings.showClocks) ||
-        !app.type)
-    );
-  apps.sort((a, b) => {
-    var n = (0 | a.sortorder) - (0 | b.sortorder);
-    if (n) return n;
-    if (a.name < b.name) return -1;
-    if (a.name > b.name) return 1;
-    return 0;
-  });
+  let launchCache = s.readJSON("launch.cache.json", true)||{};
+  let launchHash = require("Storage").hash(/\.info/);
+  if (launchCache.hash!=launchHash) {
+  launchCache = {
+    hash : launchHash,
+    apps : s.list(/\.info$/)
+      .map(app=>{var a=s.readJSON(app,1);return a&&{name:a.name,type:a.type,icon:a.icon,sortorder:a.sortorder,src:a.src};})
+      .filter(app=>app && (app.type=="app" || (app.type=="clock" && settings.showClocks) || !app.type))
+      .sort((a,b)=>{
+        var n=(0|a.sortorder)-(0|b.sortorder);
+        if (n) return n; // do sortorder first
+        if (a.name<b.name) return -1;
+        if (a.name>b.name) return 1;
+        return 0;
+      }) };
+    s.writeJSON("launch.cache.json", launchCache);
+  }
+  let apps = launchCache.apps;
   apps.forEach((app) => {
     if (app.icon) app.icon = s.read(app.icon);
   });