Suppose I have the following markdown content
# What is super?
Super is a keyword used to pass props to the upper classes.
Let's begin
...
..
etc..
For any blog, the title and description are really important.
For title, I would like to get the first # h1 tag and for description, I would like to get the first paragraph p tag.
I can not use browser API because the code is running on NodeJs.
In the case of the above content, the title and description should be
const regex = {
title: /^#\s+.+/,
heading: /^#+\s+.+/,
custom: /\$\$\s*\w+/,
ol: /\d+\.\s+.*/,
ul: /\*\s+.*/,
task: /\*\s+\[.]\s+.*/,
blockQuote: /\>.*/,
table: /\|.*/,
image: /\!\[.+\]\(.+\).*/,
url: /\[.+\]\(.+\).*/,
codeBlock: /\`{3}\w+.*/,
};
const isTitle = (str) => regex.title.test(str);
const isHeading = (str) => regex.heading.test(str);
const isCustom = (str) => regex.custom.test(str);
const isOl = (str) => regex.ol.test(str);
const isUl = (str) => regex.ul.test(str);
const isTask = (str) => regex.task.test(str);
const isBlockQuote = (str) => regex.blockQuote.test(str);
const isImage = (str) => regex.image.test(str);
const isUrl = (str) => regex.url.test(str);
const isCodeBlock = (str) => regex.codeBlock.test(str);
export function getMdTitle(md) {
if (!md) return "";
let tokens = md.split("\n");
for (let i = 0; i < tokens.length; i++) {
if (isTitle(tokens[i])) return tokens[i];
}
return "";
}
export function getMdDescription(md) {
if (!md) return "";
let tokens = md.split("\n");
for (let i = 0; i < tokens.length; i++) {
if (
isHeading(tokens[i]) ||
isCustom(tokens[i]) ||
isOl(tokens[i]) ||
isUl(tokens[i]) ||
isTask(tokens[i]) ||
isBlockQuote(tokens[i]) ||
isImage(tokens[i]) ||
isUrl(tokens[i]) ||
isCodeBlock(tokens[i])
)
continue;
return tokens[i];
}
return "";
}