feat: work on previewing post

.vscode/settings.json

@@ -1,4 +1,12 @@
 {
   "css.lint.unknownAtRules": "ignore",
-  "cSpell.words": ["codemirror", "conve", "Keymap", "nextjs", "signup", "svix"]
+  "cSpell.words": [
+    "codemirror",
+    "conve",
+    "Keymap",
+    "nextjs",
+    "rehype",
+    "signup",
+    "svix"
+  ]
 }

package.json

@@ -10,11 +10,13 @@
   },
   "dependencies": {
     "@clerk/nextjs": "^4.23.5",
+    "@codemirror/commands": "^6.2.5",
     "@codemirror/lang-markdown": "^6.2.0",
     "@codemirror/language": "^6.9.0",
     "@codemirror/language-data": "^6.3.1",
     "@codemirror/state": "^6.2.1",
     "@codemirror/view": "^6.18.0",
+    "@lezer/highlight": "^1.1.6",
     "@types/node": "20.6.0",
     "@types/react": "18.2.21",
     "@types/react-dom": "18.2.7",
@@ -29,8 +31,12 @@
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "react-icons": "^4.11.0",
+    "react-markdown": "^8.0.7",
+    "react-syntax-highlighter": "^15.5.0",
+    "remark-gfm": "^3.0.1",
     "svix": "^1.11.0",
     "tailwindcss": "3.3.3",
-    "typescript": "5.2.2"
+    "typescript": "5.2.2",
+    "@types/react-syntax-highlighter": "^15.5.7"
   }
 }

src/components/Editor.tsx

@@ -1,23 +1,53 @@
 'use client';
 
 import { useCodeMirror } from '@/hooks';
+import { darkTheme } from '@/lib/codemirror';
+import { indentWithTab } from '@codemirror/commands';
 import { markdown, markdownLanguage } from '@codemirror/lang-markdown';
 import { languages } from '@codemirror/language-data';
-import { EditorState } from '@codemirror/state';
+import { Compartment, EditorState } from '@codemirror/state';
+import { EditorView, keymap } from '@codemirror/view';
 import { basicSetup } from 'codemirror';
-import { useState } from 'react';
+import { useTheme } from 'next-themes';
+import { useEffect, useState } from 'react';
+import ReactMarkdown from 'react-markdown';
+import { Prism as SyntaxHighlighter } from 'react-syntax-highlighter';
+import { oneDark } from 'react-syntax-highlighter/dist/esm/styles/prism';
+import remarkGfm from 'remark-gfm';
 
 export default function Editor() {
+  const { theme } = useTheme();
+  const editorTheme = new Compartment();
+  const [currentDoc, setCurrentDoc] = useState('');
+
   const doc = [''];
   const extensions = [
     basicSetup,
     markdown({ base: markdownLanguage, codeLanguages: languages }),
     EditorState.tabSize.of(2),
+    editorTheme.of([]),
+    keymap.of([indentWithTab]),
+    EditorView.updateListener.of(vu => {
+      setCurrentDoc(vu.state.doc.toString());
+    }),
   ];
 
   const [mode, setMode] = useState<'write' | 'preview'>('write');
   const { editorRef, editorView } = useCodeMirror({ doc, extensions });
 
+  useEffect(() => {
+    if (editorView === null) {
+      return;
+    }
+
+    if (theme === 'dark') {
+      editorView.dispatch({
+        effects: editorTheme.reconfigure([darkTheme]),
+      });
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [theme, editorView]);
+
   return (
     <form className='flex flex-col shadow-md rounded-md dark:bg-secondary-gray border border-gray-600'>
       <div className='flex items-center justify-between rounded-t-md p-4 pb-0 border-b border-gray-600 dark:bg-primary-gray'>
@@ -42,7 +72,38 @@ export default function Editor() {
         <div></div>
       </div>
       <div className='p-4'>
-        <div ref={editorRef}></div>
+        <div
+          className={`${mode === 'write' ? '' : 'hidden'}`}
+          ref={editorRef}
+        ></div>
+        <ReactMarkdown
+          className={`${mode === 'preview' ? '' : 'hidden'}`}
+          remarkPlugins={[remarkGfm]}
+          components={{
+            code({ node, inline, className, children, ...props }) {
+              const match = /language-(\w+)/.exec(className || '');
+              return !inline && match ? (
+                <SyntaxHighlighter
+                  {...props}
+                  style={oneDark}
+                  language={match[1]}
+                  PreTag='div'
+                >
+                  {String(children).replace(/\n$/, '')}
+                </SyntaxHighlighter>
+              ) : (
+                <code
+                  {...props}
+                  className={className}
+                >
+                  {children}
+                </code>
+              );
+            },
+          }}
+        >
+          {currentDoc}
+        </ReactMarkdown>
       </div>
       <div className='flex items-center justify-end'>
         <button type='submit'>Post</button>

src/lib/codemirror/index.ts

@@ -0,0 +1,80 @@
+import { HighlightStyle } from '@codemirror/language';
+import { EditorView } from '@codemirror/view';
+import { tags as t } from '@lezer/highlight';
+
+export const darkTheme = EditorView.theme(
+  {
+    '&': {
+      backgroundColor: '#24272d',
+      color: '#d0d9e4',
+      height: '100%',
+    },
+    '.cm-content': {
+      caretColor: '#f8f8f0',
+    },
+    '.cm-content, .cm-gutter': { height: '100%' },
+    '.cm-scroller': { overflow: 'auto' },
+    '.cm-cursor, .cm-dropCursor': {
+      borderLeftColor: '#f8f8f0',
+    },
+    '&.cm-focused': {
+      outline: 'none',
+    },
+    '&.cm-focused .cm-selectionBackground .cm-selectionBackground, .cm-content ::selection':
+      {
+        backgroundColor: '#2f333a',
+      },
+    '.cm-activeLine': {
+      backgroundColor: 'transparent',
+    },
+    '.cm-gutters': {
+      border: 'none',
+      backgroundColor: '#24272d',
+      color: 'd0d9e4',
+    },
+    '.cm-activeLineGutter': {
+      backgroundColor: 'transparent',
+    },
+  },
+  { dark: true }
+);
+
+export const highlightStyle = HighlightStyle.define([
+  {
+    tag: t.comment,
+    color: '#6272a4',
+  },
+  {
+    tag: [t.string, t.special(t.brace)],
+    color: '#f1fa8c',
+  },
+  {
+    tag: [t.number, t.self, t.bool, t.null],
+    color: '#bd93f9',
+  },
+  {
+    tag: [t.keyword, t.operator],
+    color: '#ff79c6',
+  },
+  {
+    tag: [t.definitionKeyword, t.typeName],
+    color: '#8be9fd',
+  },
+  {
+    tag: t.definition(t.typeName),
+    color: '#f8f8f2',
+  },
+  {
+    tag: [
+      t.className,
+      t.definition(t.propertyName),
+      t.function(t.variableName),
+      t.attributeName,
+    ],
+    color: '#50fa7b',
+  },
+  {
+    tag: [t.heading],
+    color: '#50fa7b',
+  },
+]);