feat(Helpers): impl Helpers in qml

src/ui/Helpers.qml

@@ -0,0 +1,41 @@
+pragma Singleton
+
+import QtQuick
+
+QtObject {
+    id: root
+    property var size_units : ["B","KB","MB","GB","TB"]
+
+    function fetchAppIconFromApple(bundleId, cb) {
+        if (!bundleId) { cb(""); return; }
+        var xhr = new XMLHttpRequest();
+        xhr.open("GET", "https://itunes.apple.com/lookup?bundleId=" + encodeURIComponent(bundleId));
+        xhr.onreadystatechange = function() {
+            if (xhr.readyState !== XMLHttpRequest.DONE) return;
+            if (xhr.status !== 200) { cb(""); return; }
+            try {
+                var obj = JSON.parse(xhr.responseText);
+                var results = obj && obj.results ? obj.results : [];
+                var iconUrl = results.length ? (results[0].artworkUrl100 || "") : "";
+                cb(iconUrl);
+            } catch (e) {
+                cb("");
+            }
+        };
+        xhr.send();
+    }
+
+
+    function formatSize(_size) {
+        let unit_index = 0;
+
+        let size = _size;
+
+        while(size >= 1024 && unit_index < 4) {
+            size /= 1024;
+            unit_index++;
+        }
+
+        return `${size.toFixed(2)} ${root.size_units[unit_index]}`;
+    }
+}