feat(comments): add conditional display using frontmatter

docs/features/comments.md

@@ -114,3 +114,14 @@ afterBody: [
   }),
 ],
 ```
+
+#### Conditionally display comments
+
+Quartz can conditionally display the comment box based on a field `comments` in the frontmatter. By default, all pages will display comments, to disable it for a specific page, set `comments` to `false`.
+
+```
+---
+title: Comments disabled here!
+comments: false
+---
+```

quartz/components/Comments.tsx

@@ -25,7 +25,14 @@ function boolToStringBool(b: boolean): string {
 }
 
 export default ((opts: Options) => {
-  const Comments: QuartzComponent = ({ displayClass, cfg }: QuartzComponentProps) => {
+  const Comments: QuartzComponent = ({ displayClass, fileData, cfg }: QuartzComponentProps) => {
+    // check if comments should be displayed according to frontmatter
+    const commentsFlag: boolean =
+      fileData.frontmatter?.comments === true || fileData.frontmatter?.comments === "true"
+    if (!commentsFlag) {
+      return <></>
+    }
+
     return (
       <div
         class={classNames(displayClass, "giscus")}

quartz/plugins/transformers/frontmatter.ts

@@ -93,6 +93,7 @@ declare module "vfile" {
         lang: string
         enableToc: string
         cssclasses: string[]
+        comments: boolean | string
       }>
   }
 }