feat: add `Strikethrough` syntax (#557)

feat: add `Strikethrough` rule

web/src/labs/marked/parser/DoneList.ts

 import { inlineElementParserList } from ".";
 import { marked } from "..";
 
-export const DONE_LIST_REG = /^- \[x\] (.+)(\n?)/;
+export const DONE_LIST_REG = /^- \[[xX]\] (.+)(\n?)/;
 
 const renderer = (rawStr: string): string => {
   const matchResult = rawStr.match(DONE_LIST_REG);

web/src/labs/marked/parser/Strikethrough.ts

+import { marked } from "..";
+
+export const STRIKETHROUGH_REG = /~~(.+?)~~/;
+
+const renderer = (rawStr: string): string => {
+  const matchResult = rawStr.match(STRIKETHROUGH_REG);
+  if (!matchResult) {
+    return rawStr;
+  }
+
+  const parsedContent = marked(matchResult[1], [], []);
+  return `<del>${parsedContent}</del>`;
+};
+
+export default {
+  name: "Strikethrough",
+  regex: STRIKETHROUGH_REG,
+  renderer,
+};

web/src/labs/marked/parser/index.ts

@@ -16,6 +16,7 @@ import Table from "./Table";
 import BoldEmphasis from "./BoldEmphasis";
 import Blockquote from "./Blockquote";
 import HorizontalRules from "./HorizontalRules";
+import Strikethrough from "./Strikethrough";
 
 export { CODE_BLOCK_REG } from "./CodeBlock";
 export { TODO_LIST_REG } from "./TodoList";
@@ -38,5 +39,5 @@ export const blockElementParserList = [
   UnorderedList,
   Paragraph,
 ];
-export const inlineElementParserList = [Image, BoldEmphasis, Bold, Emphasis, Link, InlineCode, PlainLink, Tag, PlainText];
+export const inlineElementParserList = [Image, BoldEmphasis, Bold, Emphasis, Link, InlineCode, PlainLink, Strikethrough, Tag, PlainText];
 export const parserList = [...blockElementParserList, ...inlineElementParserList];