More ways to define tags in frontmatter

plugs/template/util.ts

@@ -1,6 +1,6 @@
+import { determineTags } from "$sb/lib/cheap_yaml.ts";
+
 const frontMatterRegex = /^---\n(([^\n]|\n)*?)---\n/;
-const yamlKvRegex = /^\s*(\w+):\s*(.*)/;
-const yamlListItemRegex = /^\s*-\s+(.+)/;
 
 /**
  * Quick and dirty way to check if a page is a template or not
@@ -13,30 +13,9 @@ export function isTemplate(pageText: string): boolean {
   if (frontmatter) {
     pageText = pageText.slice(frontmatter[0].length);
     const frontmatterText = frontmatter[1];
-    const lines = frontmatterText.split("\n");
-    let inTagsSection = false;
-    for (const line of lines) {
-      const yamlKv = yamlKvRegex.exec(line);
-      if (yamlKv) {
-        const [key, value] = yamlKv.slice(1);
-        // Looking for a 'tags' key
-        if (key === "tags") {
-          inTagsSection = true;
-          // 'template' there? Yay!
-          if (value.split(/,\s*/).includes("template")) {
-            return true;
-          }
-        } else {
-          inTagsSection = false;
-        }
-      }
-      const yamlListem = yamlListItemRegex.exec(line);
-      if (yamlListem && inTagsSection) {
-        // List item is 'template'? Yay!
-        if (yamlListem[1] === "template") {
-          return true;
-        }
-      }
+    const tags = determineTags(frontmatterText);
+    if (tags.includes("template")) {
+      return true;
     }
   }
   // Or if the page text starts with a #template tag