Templates 2.0 (#636)

Templates 2.0 and a whole bunch of other refactoring

plug-api/lib/builtin_query_functions.ts

@@ -11,6 +11,12 @@ export const builtinFunctions: FunctionMap = {
   min(...args: number[]) {
     return Math.min(...args);
   },
+  replace(str: string, match: [string, string] | string, replace: string) {
+    const matcher = Array.isArray(match)
+      ? new RegExp(match[0], match[1] + "g")
+      : match;
+    return str.replaceAll(matcher, replace);
+  },
   toJSON(obj: any) {
     return JSON.stringify(obj);
   },

plug-api/lib/tree.ts

@@ -191,7 +191,10 @@ export function nodeAtPos(tree: ParseTree, pos: number): ParseTree | null {
 }
 
 // Turn ParseTree back into text
-export function renderToText(tree: ParseTree): string {
+export function renderToText(tree?: ParseTree): string {
+  if (!tree) {
+    return "";
+  }
   const pieces: string[] = [];
   if (tree.text !== undefined) {
     return tree.text;