feat: Native emoji w/ image-based fallbacks and improved parsing (#1746)

* Render native emoji with image fallback

Fix #779

* Deprecate emoji plugin

* Add emoji tests

* Remove console.log statement

* Fix emoji image alt attribute

* Set nativeEmoji to false by default (non-breaking)

* Fix parsing emoji in HTML comments and script tags

* Add nativeEmoji and update noEmoji details

* Add Emoji plugin deprecation notice

* Fix ESLint issues

* Create build:emoji task

- Auto-generate emoji data from GitHub API
- Auto-generate emoji markdown for website
- Add emoji page to navigation

* Fix rendering of GitHub emoji without unicode

* Adjust and match size of native and image emoji

* Update emoji test snapshot

* Update docs test snapshot

* Fix ci/codesandbox error

* Update native emoji font-stack

* Fix rendering of native multi-character emoji

* Kick GitHub Workflow

* Replace rollup’s uglify plugin with terser

* Switch “npm ci” instead of “npm i” for stability

* Change emoji data from default to named export

* Revert "Replace rollup’s uglify plugin with terser"

This reverts commit 7ba8513.

* Revert "Switch “npm ci” instead of “npm i” for stability"

This reverts commit d52b476.

* Revert "Change emoji data from default to named export"

This reverts commit 3f2dd46.

* Specify codesandbox template and node version

* Update codesandbox config

* Revert "Revert "Replace rollup’s uglify plugin with terser""

This reverts commit e06fed4.

* Revert "Revert "Revert "Replace rollup’s uglify plugin with terser"""

This reverts commit 27d4952.

* Update codesandbox config

* Revert "Update codesandbox config"

This reverts commit 5120dd2.

* Fix codesandbox uglify error

* Emoji docs tweaks

* Restore and update emoji plugin code

* Restore and update emoji plugin docs

* Prettier updates

* Match lowercase shortcodes only

Co-authored-by: Koy Zhuang <369491420@qq.com>

Author: jhildenbiddle

.codesandbox/ci.json

@@ -1,4 +1,5 @@
 {
   "sandboxes": ["2d17z"],
-  "packages": [".", "packages/docsify-server-renderer"]
+  "packages": [".", "packages/docsify-server-renderer"],
+  "node": "16"
 }

build/emoji.js

@@ -0,0 +1,91 @@
+const axios = require('axios');
+const fs = require('fs');
+const path = require('path');
+
+const filePaths = {
+  emojiMarkdown: path.resolve(process.cwd(), 'docs', 'emoji.md'),
+  emojiJS: path.resolve(
+    process.cwd(),
+    'src',
+    'core',
+    'render',
+    'emojify-data.js'
+  ),
+};
+
+async function getEmojiData() {
+  const emojiDataURL = 'https://api.github.com/emojis';
+  const response = await axios.get(emojiDataURL);
+  const baseURL = Object.values(response.data)
+    .find(url => /unicode\//)
+    .split('unicode/')[0];
+  const data = { ...response.data };
+
+  // Remove base URL from emoji URLs
+  Object.entries(data).forEach(
+    ([key, value]) => (data[key] = value.replace(baseURL, ''))
+  );
+
+  return {
+    baseURL,
+    data,
+  };
+}
+
+function writeEmojiPage(emojiData) {
+  const emojiPage =
+    (fs.existsSync(filePaths.emojiMarkdown) &&
+      fs.readFileSync(filePaths.emojiMarkdown, 'utf8')) ||
+    `<!-- START -->\n\n<!-- END -->`;
+  const emojiRegEx = /(<!--\s*START.*-->\n)([\s\S]*)(\n<!--\s*END.*-->)/;
+  const emojiMatch = emojiPage.match(emojiRegEx);
+  const emojiMarkdownStart = emojiMatch[1].trim();
+  const emojiMarkdown = emojiMatch[2].trim();
+  const emojiMarkdownEnd = emojiMatch[3].trim();
+  const newEmojiMarkdown = Object.keys(emojiData.data)
+    .reduce(
+      (preVal, curVal) =>
+        (preVal += `:${curVal}: ` + '`' + `:${curVal}:` + '`' + '\n\n'),
+      ''
+    )
+    .trim();
+
+  if (emojiMarkdown !== newEmojiMarkdown) {
+    const newEmojiPage = emojiPage.replace(
+      emojiMatch[0],
+      `${emojiMarkdownStart}\n${newEmojiMarkdown}\n${emojiMarkdownEnd}`
+    );
+
+    fs.writeFileSync(filePaths.emojiMarkdown, newEmojiPage);
+    console.info(`- Created new file: ${filePaths.emojiMarkdown}`);
+  } else {
+    console.info(`- No changes to file: ${filePaths.emojiMarkdown}`);
+  }
+}
+
+function writeEmojiJS(emojiData) {
+  const emojiJS =
+    fs.existsSync(filePaths.emojiJS) &&
+    fs.readFileSync(filePaths.emojiJS, 'utf8');
+  const newEmojiJS = `export default ${JSON.stringify(emojiData, {}, 2)}`;
+
+  if (!emojiJS || emojiJS !== newEmojiJS) {
+    fs.writeFileSync(filePaths.emojiJS, newEmojiJS);
+    console.info(`- Created new file: ${filePaths.emojiJS}`);
+  } else {
+    console.info(`- No changes to file: ${filePaths.emojiJS}`);
+  }
+}
+
+(async () => {
+  console.log('Build emoji');
+
+  try {
+    const emojiData = await getEmojiData();
+
+    writeEmojiPage(emojiData);
+    writeEmojiJS(emojiData);
+  } catch (e) {
+    console.error(e);
+  }
+})();

docs/_sidebar.md

@@ -13,6 +13,7 @@
   - [Write a Plugin](write-a-plugin.md)
   - [Markdown configuration](markdown.md)
   - [Language highlighting](language-highlight.md)
+  - [Emoji](emoji.md)
 
 - Guide
 

docs/configuration.md

@@ -16,7 +16,7 @@ The config can also be defined as a function, in which case the first argument i
 
 ```html
 <script>
-  window.$docsify = function(vm) {
+  window.$docsify = function (vm) {
     return {
       markdown: {
         renderer: {
@@ -319,14 +319,14 @@ window.$docsify = {
   markdown: {
     smartypants: true,
     renderer: {
-      link: function() {
+      link: function () {
         // ...
       },
     },
   },
 
   // function
-  markdown: function(marked, renderer) {
+  markdown: function (marked, renderer) {
     // ...
     return marked;
   },
@@ -398,19 +398,97 @@ window.$docsify = {
 
 Note that if you are running an external script, e.g. an embedded jsfiddle demo, make sure to include the [external-script](plugins.md?id=external-script) plugin.
 
+## nativeEmoji
+
+- type: `Boolean`
+- default: `false`
+
+Render emoji shorthand codes using GitHub-style emoji images or platform-native emoji characters.
+
+```js
+window.$docsify = {
+  nativeEmoji: true,
+};
+```
+
+```markdown
+:smile:
+:partying_face:
+:joy:
+:+1:
+:-1:
+```
+
+GitHub-style images when `false`:
+
+<output data-lang="output">
+  <img class="emoji" src="https://github.githubassets.com/images/icons/emoji/unicode/1f604.png" alt="smile">
+  <img class="emoji" src="https://github.githubassets.com/images/icons/emoji/unicode/1f973.png" alt="partying_face">
+  <img class="emoji" src="https://github.githubassets.com/images/icons/emoji/unicode/1f602.png" alt="joy">
+  <img class="emoji" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44d.png" alt="+1">
+  <img class="emoji" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png" alt="-1">
+</output>
+
+Platform-native characters when `true`:
+
+<output data-lang="output">
+  <span class="emoji">😄︎</span>
+  <span class="emoji">🥳︎</span>
+  <span class="emoji">😂︎</span>
+  <span class="emoji">👍︎</span>
+  <span class="emoji">👎︎</span>
+</output>
+
+To render shorthand codes as text, replace `:` characters with the `&colon;` HTML entity.
+
+```markdown
+&colon;100&colon;
+```
+
+<output data-lang="output">
+
+&colon;100&colon;
+
+</output>
+
 ## noEmoji
 
 - type: `Boolean`
+- default: `false`
 
-Disabled emoji parse.
+Disabled emoji parsing and render all emoji shorthand as text.
 
 ```js
 window.$docsify = {
   noEmoji: true,
 };
 ```
 
-?> If this option is `false` but you don't want to emojify some specific colons, [refer to this](https://github.com/docsifyjs/docsify/issues/742#issuecomment-586313143)
+```markdown
+:100:
+```
+
+<output data-lang="output">
+
+&colon;100&colon;
+
+</output>
+
+To disable emoji parsing of individual shorthand codes, replace `:` characters with the `&colon;` HTML entity.
+
+```markdown
+:100:
+
+&colon;100&colon;
+```
+
+<output data-lang="output">
+
+:100:
+
+&colon;100&colon;
+
+</output>
 
 ## mergeNavbar
 
@@ -435,7 +513,7 @@ See https://github.com/lukeed/tinydate#patterns
 window.$docsify = {
   formatUpdated: '{MM}/{DD} {HH}:{mm}',
 
-  formatUpdated: function(time) {
+  formatUpdated: function (time) {
     // ...
 
     return time;