Fixes #319

plug-api/lib/yaml_page.ts

@@ -2,13 +2,13 @@ import { findNodeOfType, traverseTree } from "$sb/lib/tree.ts";
 import { markdown, space } from "$sb/silverbullet-syscall/mod.ts";
 import * as YAML from "yaml";
 
-export async function readYamlPage(
+export async function readCodeBlockPage(
   pageName: string,
-  allowedLanguages = ["yaml"],
-): Promise<any> {
+  allowedLanguages?: string[],
+): Promise<string | undefined> {
   const text = await space.readPage(pageName);
   const tree = await markdown.parseMarkdown(text);
-  let data: any = {};
+  let codeText: string | undefined;
 
   traverseTree(tree, (t): boolean => {
     // Find a fenced code block
@@ -16,10 +16,13 @@ export async function readYamlPage(
       return false;
     }
     const codeInfoNode = findNodeOfType(t, "CodeInfo");
-    if (!codeInfoNode) {
+    if (allowedLanguages && !codeInfoNode) {
       return false;
     }
-    if (!allowedLanguages.includes(codeInfoNode.children![0].text!)) {
+    if (
+      allowedLanguages &&
+      !allowedLanguages.includes(codeInfoNode!.children![0].text!)
+    ) {
       return false;
     }
     const codeTextNode = findNodeOfType(t, "CodeText");
@@ -27,17 +30,27 @@ export async function readYamlPage(
       // Honestly, this shouldn't happen
       return false;
     }
-    const codeText = codeTextNode.children![0].text!;
-    try {
-      data = YAML.parse(codeText);
-    } catch (e: any) {
-      console.error("YAML Page parser error", e);
-      throw new Error(`YAML Error: ${e.message}`);
-    }
+    codeText = codeTextNode.children![0].text!;
     return true;
   });
 
-  return data;
+  return codeText;
+}
+
+export async function readYamlPage(
+  pageName: string,
+  allowedLanguages = ["yaml"],
+): Promise<any> {
+  const codeText = await readCodeBlockPage(pageName, allowedLanguages);
+  if (codeText === undefined) {
+    return undefined;
+  }
+  try {
+    return YAML.parse(codeText);
+  } catch (e: any) {
+    console.error("YAML Page parser error", e);
+    throw new Error(`YAML Error: ${e.message}`);
+  }
 }
 
 export async function writeYamlPage(