LT-67 Creating utility helpers for lesiontracker package and implementing servers listing

Packages/lesiontracker/client/helpers/blaze.js

@@ -0,0 +1,14 @@
+Template.registerHelper("instance", function() {
+    return Template.instance();
+});
+
+Template.registerHelper("extend", function(object, extendedProperties){
+    const result = {};
+    for (let i=0; i<arguments.length; i++) {
+        let current = arguments[i];
+        if (typeof current !== "object") continue;
+        current instanceof Spacebars.kw && (current = current.hash);
+        _.extend(result, current);
+    }
+    return result;
+});

Packages/lesiontracker/client/helpers/logical.js

@@ -0,0 +1,35 @@
+Template.registerHelper("choose", function() {
+    let result;
+    _.each(arguments, value => {
+        if (result || value instanceof Spacebars.kw) return;
+        value && (result = value);
+    });
+    return result;
+});
+
+Template.registerHelper("bool", function(value) {
+    return !!value;
+});
+
+Template.registerHelper("equals", function(a, b) {
+    return a === b;
+});
+
+Template.registerHelper("not", function(value) {
+    return !value;
+});
+
+Template.registerHelper("and", function() {
+    let result = true;
+    _.each(arguments, value => value || (result = false));
+    return result;
+});
+
+Template.registerHelper("or", function() {
+    let result = false;
+    _.each(arguments, value => {
+        if (value instanceof Spacebars.kw) return;
+        value && (result = true);
+    });
+    return result;
+});