code refactor

src/lib/template.js

@@ -0,0 +1,41 @@
+export function isNoAvailableTemplate(templates, showHidden) {
+    for (let i = 0; i < templates.length; i++) {
+        if (showHidden || !templates[i].hidden) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+export function getAvailableTemplateCount(templates, showHidden) {
+    let count = 0;
+
+    for (let i = 0; i < templates.length; i++) {
+        if (showHidden || !templates[i].hidden) {
+            count++;
+        }
+    }
+
+    return count;
+}
+
+export function getFirstShowingId(templates, showHidden) {
+    for (let i = 0; i < templates.length; i++) {
+        if (showHidden || !templates[i].hidden) {
+            return templates[i].id;
+        }
+    }
+
+    return null;
+}
+
+export function getLastShowingId(templates, showHidden) {
+    for (let i = templates.length - 1; i >= 0; i--) {
+        if (showHidden || !templates[i].hidden) {
+            return templates[i].id;
+        }
+    }
+
+    return null;
+}