feat: add blog comments via utterances

components/NotionPage.tsx

@@ -25,6 +25,7 @@ import { Loading } from './Loading'
 import { Page404 } from './Page404'
 import { PageHead } from './PageHead'
 import { Footer } from './Footer'
+import { ReactUtterances } from './ReactUtterances'
 
 import styles from './styles.module.css'
 
@@ -87,6 +88,20 @@ export const NotionPage: React.FC<types.PageProps> = ({
   const canonicalPageUrl =
     !isDev && getCanonicalPageUrl(site, recordMap)(pageId)
 
+  let comments: React.ReactNode = null
+
+  if (block.type === 'page' && block.parent_table === 'collection') {
+    comments = (
+      <ReactUtterances
+        repo='transitive-bullshit/transitivebullsh.it'
+        issueMap='issue-term'
+        issueTerm='title'
+        label='blog'
+        theme='preferred-color-scheme'
+      />
+    )
+  }
+
   return (
     <IconContext.Provider value={{ style: { verticalAlign: 'middle' } }}>
       <PageHead site={site} />
@@ -144,6 +159,7 @@ export const NotionPage: React.FC<types.PageProps> = ({
         mapPageUrl={siteMapPageUrl}
         mapImageUrl={mapNotionImageUrl}
         searchNotion={searchNotion}
+        pageFooter={comments}
         footer={<Footer />}
       />
 

components/ReactUtterances.tsx

@@ -0,0 +1,96 @@
+import React from 'react'
+
+import styles from './styles.module.css'
+
+export type MappingType =
+  | 'pathname'
+  | 'url'
+  | 'title'
+  | 'og:title'
+  | 'issue-number'
+  | 'issue-term'
+
+export type Theme =
+  | 'github-light'
+  | 'github-dark'
+  | 'preferred-color-scheme'
+  | 'github-dark-orange'
+  | 'icy-dark'
+  | 'dark-blue'
+  | 'photon-dark'
+
+interface ReactUtterancesProps {
+  repo: string
+  issueMap: MappingType
+  issueTerm?: string
+  issueNumber?: number
+  label?: string
+  theme: Theme
+}
+
+interface ReactUtterancesState {
+  pending: boolean
+}
+
+export class ReactUtterances extends React.Component<
+  ReactUtterancesProps,
+  ReactUtterancesState
+> {
+  reference: React.RefObject<HTMLDivElement>
+
+  constructor(props: ReactUtterancesProps) {
+    super(props)
+
+    if (props.issueMap === 'issue-term' && props.issueTerm === undefined) {
+      throw Error(
+        "Property 'issueTerm' must be provided with issueMap 'issue-term'"
+      )
+    }
+
+    if (props.issueMap === 'issue-number' && props.issueNumber === undefined) {
+      throw Error(
+        "Property 'issueNumber' must be provided with issueMap 'issue-number'"
+      )
+    }
+
+    this.reference = React.createRef<HTMLDivElement>()
+    this.state = { pending: true }
+  }
+
+  componentDidMount(): void {
+    const { repo, issueMap, issueTerm, issueNumber, label, theme } = this.props
+    const scriptElement = document.createElement('script')
+    scriptElement.src = 'https://utteranc.es/client.js'
+    scriptElement.async = true
+    scriptElement.defer = true
+    scriptElement.setAttribute('repo', repo)
+    scriptElement.setAttribute('crossorigin', 'annonymous')
+    scriptElement.setAttribute('theme', theme)
+    scriptElement.onload = () => this.setState({ pending: false })
+
+    if (label) {
+      scriptElement.setAttribute('label', label)
+    }
+
+    if (issueMap === 'issue-number') {
+      scriptElement.setAttribute('issue-number', issueNumber!.toString())
+    } else if (issueMap === 'issue-term') {
+      scriptElement.setAttribute('issue-term', issueTerm!)
+    } else {
+      scriptElement.setAttribute('issue-term', issueMap)
+    }
+
+    // TODO: Check current availability
+    this.reference.current!.appendChild(scriptElement)
+  }
+
+  render(): React.ReactElement {
+    return (
+      <div className={styles.comments}>
+        <div className={styles.utterances} ref={this.reference}>
+          {this.state.pending && <p>Loading Comments...</p>}
+        </div>
+      </div>
+    )
+  }
+}

components/styles.module.css

@@ -86,3 +86,22 @@
 .linkedin:hover {
   color: #0077b5;
 }
+
+.comments {
+  width: 100%;
+  margin-top: 2em;
+  border-top: 1px solid var(--fg-color-0);
+}
+
+.utterances {
+  margin-top: 2em;
+  width: 100%;
+}
+
+@media only screen and (min-width: 567px) {
+  .utterances {
+    width: calc(100% + 60px);
+    position: relative;
+    left: -60px;
+  }
+}