Complete redo of content indexing and querying (#517)

Complete redo of data store
Introduces live queries and live templates

plug-api/lib/builtin_query_functions.ts

@@ -0,0 +1,39 @@
+import type { FunctionMap } from "$sb/types.ts";
+import { niceDate } from "$sb/lib/dates.ts";
+
+export const builtinFunctions: FunctionMap = {
+  today() {
+    return niceDate(new Date());
+  },
+  max(...args: number[]) {
+    return Math.max(...args);
+  },
+  min(...args: number[]) {
+    return Math.min(...args);
+  },
+  toJSON(obj: any) {
+    return JSON.stringify(obj);
+  },
+  // Note: these assume Monday as the first day of the week
+  firstDayOfWeek(dateString: string): string {
+    const date = new Date(dateString);
+    const dayOfWeek = date.getDay();
+    const daysToSubtract = (dayOfWeek + 7 - 1) % 7;
+    const firstDayOfWeek = new Date(date);
+    firstDayOfWeek.setDate(date.getDate() - daysToSubtract);
+    return niceDate(firstDayOfWeek);
+  },
+  lastDayOfWeek(dateString: string): string {
+    const date = new Date(dateString);
+    const dayOfWeek = date.getDay();
+    const daysToAdd = (7 - dayOfWeek) % 7;
+    const lastDayOfWeek = new Date(date);
+    lastDayOfWeek.setDate(date.getDate() + daysToAdd);
+    return niceDate(lastDayOfWeek);
+  },
+  addDays(dateString: string, daysToAdd: number): string {
+    const date = new Date(dateString);
+    date.setDate(date.getDate() + daysToAdd);
+    return niceDate(date);
+  },
+};