feat: add support for giscus, utterances, disqus

components/comments/Disqus.js

@@ -0,0 +1,37 @@
+import React, { useState } from 'react'
+
+import siteMetadata from '@/data/siteMetadata'
+
+const Disqus = ({ frontMatter }) => {
+  const [enableLoadComments, setEnabledLoadComments] = useState(true)
+
+  const COMMENTS_ID = 'disqus_thread'
+
+  function LoadComments() {
+    setEnabledLoadComments(false)
+
+    window.disqus_config = function () {
+      this.page.url = window.location.href
+      this.page.identifier = frontMatter.slug
+    }
+    if (window.DISQUS === undefined) {
+      const script = document.createElement('script')
+      script.src = 'https://' + siteMetadata.comment.disqus.shortname + '.disqus.com/embed.js'
+      script.setAttribute('data-timestamp', +new Date())
+      script.setAttribute('crossorigin', 'anonymous')
+      script.async = true
+      document.body.appendChild(script)
+    } else {
+      window.DISQUS.reset({ reload: true })
+    }
+  }
+
+  return (
+    <div className="pt-6 pb-6 text-center text-gray-700 dark:text-gray-300">
+      {enableLoadComments && <button onClick={LoadComments}>Load Comments</button>}
+      <div className="disqus-frame" id={COMMENTS_ID} />
+    </div>
+  )
+}
+
+export default Disqus

components/comments/Giscus.js

@@ -0,0 +1,49 @@
+import React, { useState } from 'react'
+
+import siteMetadata from '@/data/siteMetadata'
+
+const Giscus = ({ mapping }) => {
+  const [enableLoadComments, setEnabledLoadComments] = useState(true)
+
+  const COMMENTS_ID = 'comments-container'
+
+  function LoadComments() {
+    setEnabledLoadComments(false)
+    const script = document.createElement('script')
+    script.src = 'https://giscus.app/client.js'
+    script.setAttribute('data-repo', siteMetadata.comment.giscusConfig.repo)
+    script.setAttribute('data-repo-id', siteMetadata.comment.giscusConfig.repositoryId)
+    script.setAttribute('data-category', siteMetadata.comment.giscusConfig.category)
+    script.setAttribute('data-category-id', siteMetadata.comment.giscusConfig.categoryId)
+    script.setAttribute('data-mapping', mapping)
+    script.setAttribute('data-reactions-enabled', siteMetadata.comment.giscusConfig.reactions)
+    script.setAttribute('data-emit-metadata', siteMetadata.comment.giscusConfig.metadata)
+    script.setAttribute(
+      'data-theme',
+      `${
+        siteMetadata.comment.giscusConfig.themeURL === ''
+          ? siteMetadata.comment.giscusConfig.theme
+          : siteMetadata.comment.giscusConfig.themeURL
+      }`
+    )
+    script.setAttribute('crossorigin', 'anonymous')
+    script.async = true
+
+    const comments = document.getElementById(COMMENTS_ID)
+    if (comments) comments.appendChild(script)
+
+    return () => {
+      const comments = document.getElementById(COMMENTS_ID)
+      if (comments) comments.innerHTML = ''
+    }
+  }
+
+  return (
+    <div className="pt-6 pb-6 text-center text-gray-700 dark:text-gray-300">
+      {enableLoadComments && <button onClick={LoadComments}>Load Comments</button>}
+      <div className="giscus-frame" id={COMMENTS_ID} />
+    </div>
+  )
+}
+
+export default Giscus

components/comments/Utterances.js

@@ -0,0 +1,39 @@
+import React, { useState } from 'react'
+
+import siteMetadata from '@/data/siteMetadata'
+
+const Utterances = ({ issueTerm }) => {
+  const [enableLoadComments, setEnabledLoadComments] = useState(true)
+
+  const COMMENTS_ID = 'comments-container'
+
+  function LoadComments() {
+    setEnabledLoadComments(false)
+    const script = document.createElement('script')
+    script.src = 'https://utteranc.es/client.js'
+    script.setAttribute('repo', siteMetadata.comment.utterancesConfig.repo)
+    script.setAttribute('issue-term', issueTerm)
+    script.setAttribute('label', siteMetadata.comment.utterancesConfig.label)
+    script.setAttribute('theme', siteMetadata.comment.utterancesConfig.theme)
+    script.setAttribute('crossorigin', 'anonymous')
+    script.async = true
+
+    const comments = document.getElementById(COMMENTS_ID)
+    if (comments) comments.appendChild(script)
+
+    return () => {
+      const comments = document.getElementById(COMMENTS_ID)
+      if (comments) comments.innerHTML = ''
+    }
+  }
+
+  // Added `relative` to fix a weird bug with `utterances-frame` position
+  return (
+    <div className="pt-6 pb-6 text-center text-gray-700 dark:text-gray-300">
+      {enableLoadComments && <button onClick={LoadComments}>Load Comments</button>}
+      <div className="utterances-frame relative" id={COMMENTS_ID} />
+    </div>
+  )
+}
+
+export default Utterances

components/comments/index.js

@@ -0,0 +1,54 @@
+import siteMetadata from '@/data/siteMetadata'
+import dynamic from 'next/dynamic'
+
+const UtterancesComponent = dynamic(
+  () => {
+    return import('@/components/comments/Utterances')
+  },
+  { ssr: false }
+)
+const GiscusComponent = dynamic(
+  () => {
+    return import('@/components/comments/Giscus')
+  },
+  { ssr: false }
+)
+const DisqusComponent = dynamic(
+  () => {
+    return import('@/components/comments/Disqus')
+  },
+  { ssr: false }
+)
+
+const Comments = ({ frontMatter }) => {
+  let term
+  switch (
+    siteMetadata.comment.giscusConfig.mapping ||
+    siteMetadata.comment.utterancesConfig.issueTerm
+  ) {
+    case 'pathname':
+      term = frontMatter.slug
+      break
+    case 'url':
+      term = window.location.href
+      break
+    case 'title':
+      term = frontMatter.title
+      break
+  }
+  return (
+    <>
+      {siteMetadata.comment && siteMetadata.comment.provider === 'giscus' && (
+        <GiscusComponent mapping={term} />
+      )}
+      {siteMetadata.comment && siteMetadata.comment.provider === 'utterances' && (
+        <UtterancesComponent issueTerm={term} />
+      )}
+      {siteMetadata.comment && siteMetadata.comment.provider === 'disqus' && (
+        <DisqusComponent frontMatter={frontMatter} />
+      )}
+    </>
+  )
+}
+
+export default Comments

data/siteMetadata.js

@@ -16,6 +16,40 @@ const siteMetadata = {
   youtube: 'https://youtube.com',
   linkedin: 'https://www.linkedin.com',
   locale: 'en-US',
+  comment: {
+    provider: '', // supported providers: giscus, utterances, disqus
+    giscusConfig: {
+      repo: '', // username/repoName
+      // Visit the link below and copy/paste the 'repositoryId', 'category' and 'categoryId'
+      // https://giscus.app/api/discussions/categories?repo={username}%2F{repoName}
+      repositoryId: '',
+      category: '',
+      categoryId: '',
+      mapping: '', // supported options: pathname, url, title
+      reactions: '', // Emoji reactions: 1 = enable / 0 = disable
+      // Send discussion metadata periodically to the parent window: 1 = enable / 0 = disable
+      metadata: '',
+      // theme example: light, dark, dark_dimmed, dark_high_contrast
+      // transparent_dark, preferred_color_scheme, custom
+      theme: '',
+      // If the theme option above is set to 'custom`
+      // please provide a link below to your custom theme css file.
+      // example: https://giscus.app/themes/custom_example.css
+      themeURL: '',
+    },
+    utterancesConfig: {
+      repo: '', // username/repoName
+      issueTerm: '', // supported options: pathname, url, title
+      label: '', // label (optional): Comment 💬
+      // theme example: github-light, github-dark, preferred-color-scheme
+      // github-dark-orange, icy-dark, dark-blue, photon-dark, boxy-light
+      theme: '',
+    },
+    disqus: {
+      // https://help.disqus.com/en/articles/1717111-what-s-a-shortname
+      shortname: '',
+    },
+  },
 }
 
 module.exports = siteMetadata

layouts/PostLayout.js

@@ -5,6 +5,7 @@ import { BlogSeo } from '@/components/SEO'
 import Image from '@/components/Image'
 import Tag from '@/components/Tag'
 import siteMetadata from '@/data/siteMetadata'
+import Comments from '@/components/comments'
 
 const editUrl = (fileName) => `${siteMetadata.siteRepo}/blob/master/data/blog/${fileName}`
 const discussUrl = (slug) =>
@@ -91,6 +92,7 @@ export default function PostLayout({ frontMatter, authorDetails, next, prev, chi
                 {` • `}
                 <Link href={editUrl(fileName)}>{'View on GitHub'}</Link>
               </div>
+              <Comments frontMatter={frontMatter} />
             </div>
             <footer>
               <div className="text-sm font-medium leading-5 divide-gray-200 xl:divide-y dark:divide-gray-700 xl:col-start-1 xl:row-start-2">

layouts/PostSimple.js

@@ -4,6 +4,7 @@ import SectionContainer from '@/components/SectionContainer'
 import { BlogSeo } from '@/components/SEO'
 import siteMetadata from '@/data/siteMetadata'
 import formatDate from '@/lib/utils/formatDate'
+import Comments from '@/components/comments'
 
 export default function PostLayout({ frontMatter, authorDetails, next, prev, children }) {
   const { date, title } = frontMatter
@@ -35,6 +36,7 @@ export default function PostLayout({ frontMatter, authorDetails, next, prev, chi
             <div className="divide-y divide-gray-200 dark:divide-gray-700 xl:pb-0 xl:col-span-3 xl:row-span-2">
               <div className="pt-10 pb-8 prose dark:prose-dark max-w-none">{children}</div>
             </div>
+            <Comments frontMatter={frontMatter} />
             <footer>
               <div className="flex flex-col text-sm font-medium sm:flex-row sm:justify-between sm:text-base">
                 {prev && (