Improved layout, added warnings to result page

parse.ts

@@ -1,21 +1,22 @@
 import { Mwn } from "mwn";
 import { VideoDescription } from "./main.ts";
 
-function parseTemplate(description: string): Record<string, string> {
+function parseTemplate(description: string): { warnings: string[] } & { [k: string]: string } {
 
     const u = new (new Mwn().Wikitext)(description)
     const r = u.parseTemplates({
         namePredicate: (name) => name === "DanceWorkshopDescription",
     })
+    const warnings = []
     if (r.length < 1) {
         throw new Error("Could not find DanceWorkshopDescription")
     }
     if (r.length > 1) {
-        console.warn("More than one DanceWorkshopDescription template found")
+        warnings.push("More than one DanceWorkshopDescription template found")
     }
     const p = r[0]
     const properties = p.parameters.map(v => ({ [v.name]: v.value }))
-    return Object.assign({}, ...properties)
+    return Object.assign({}, { warnings }, ...properties)
 }
 
 function parseBlock(header: string, text: string): string {
@@ -35,9 +36,10 @@ export function parseSummary(description: string, name: string): VideoDescriptio
     const properties = parseTemplate(description)
 
     const b: Partial<VideoDescription> = {};
+    b.nags = properties.warnings
 
     if (Object.hasOwn(properties, 'teachers')) {
-        console.warn(`Page ${name} has old template usage [contains 'teachers' key]`)
+        b.nags.push(`Contains 'teachers' key instead of 'leader'/'follower'`)
         const t = properties['teachers'].split('&').map(item => item.trim());
         b.teachers = t
     } else {
@@ -52,15 +54,25 @@ export function parseSummary(description: string, name: string): VideoDescriptio
 
 
     if (!Object.hasOwn(properties, 'patterns')) {
-        console.warn(`Page ${name} has old template usage [no 'patterns' key]`)
-        b.patterns = parseBlock("Shown Patterns", description)
+        b.nags.push(`No 'patterns' key`)
+        try {
+            b.patterns = parseBlock("Shown Patterns", description)
+        } catch (e) {
+            b.nags.push("Shown Patterns: " + e)
+            b.patterns = ""
+        }
     } else {
         b.patterns = properties['patterns']
     }
 
     if (!Object.hasOwn(properties, 'notes')) {
-        console.warn(`Page ${name} has old template usage [no 'notes' key]`)
-        b.notes = parseBlock("Notes", description)
+        b.nags.push(`No 'notes' key`)
+        try {
+            b.notes = parseBlock("Notes", description)
+        } catch (e) {
+            b.nags.push("Notes: " + e)
+            b.notes = ""
+        }
     } else {
         b.notes = properties['notes']
     }