Templates 2.0 (#636)

Templates 2.0 and a whole bunch of other refactoring

common/syscalls/handlebar_helpers.ts

@@ -40,6 +40,15 @@ export function handlebarHelpers() {
       nextWeek.setDate(nextWeek.getDate() + 7);
       return niceDate(nextWeek);
     },
+    weekStart: (startOnMonday = true) => {
+      const d = new Date();
+      const day = d.getDay();
+      let diff = d.getDate() - day;
+      if (startOnMonday) {
+        diff += day == 0 ? -6 : 1;
+      }
+      return niceDate(new Date(d.setDate(diff)));
+    },
     ifEq: function (v1: any, v2: any, options: any) {
       if (v1 === v2) {
         return options.fn(this);

common/syscalls/handlebars.ts

@@ -10,14 +10,22 @@ export function handlebarsSyscalls(): SysCallMapping {
       obj: any,
       globals: Record<string, any> = {},
     ): string => {
-      const templateFn = Handlebars.compile(
-        template,
-        { noEscape: true },
-      );
-      return templateFn(obj, {
-        helpers: handlebarHelpers(),
-        data: globals,
-      });
+      return renderHandlebarsTemplate(template, obj, globals);
     },
   };
 }
+
+export function renderHandlebarsTemplate(
+  template: string,
+  obj: any,
+  globals: Record<string, any>,
+) {
+  const templateFn = Handlebars.compile(
+    template,
+    { noEscape: true },
+  );
+  return templateFn(obj, {
+    helpers: handlebarHelpers(),
+    data: globals,
+  });
+}