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If you want to change how a Markdown document is rendered in Reading view, you can add your own _Markdown post processor_. As indicated by the name, the post processor runs _after_ the Markdown has been processed into HTML. It lets you add, remove, or replace [[HTML elements]] to the rendered document.
The following example looks for any code block that contains a text between two colons, `:`, and replaces it with an appropriate emoji:
```ts
import { Plugin } from "obsidian";
const ALL_EMOJIS: Record<string, string> = {
":+1:": "👍",
":sunglasses:": "😎",
":smile:": "😄",
};
export default class ExamplePlugin extends Plugin {
async onload() {
this.registerMarkdownPostProcessor((element, context) => {
const codeblocks = element.findAll("code");
for (let codeblock of codeblocks) {
const text = codeblock.innerText.trim();
if (text[0] === ":" && text[text.length - 1] === ":") {
const emojiEl = codeblock.createSpan({
text: ALL_EMOJIS[text] ?? text,
});
codeblock.replaceWith(emojiEl);
}
}
});
}
}
```
## Post-process Markdown code blocks
Did you know that you can create [Mermaid](https://mermaid-js.github.io/) diagrams in Obsidian by creating a `mermaid` code block with a text definition like this one?:
````md
```mermaid
flowchart LR
Start --> Stop
```
````
If you change to Preview mode, the text in the code block becomes the following diagram:
```mermaid
flowchart LR
Start --> Stop
```
If you want to add your own custom code blocks like the Mermaid one, you can use [[registerMarkdownCodeBlockProcessor|registerMarkdownCodeBlockProcessor()]]. The following example renders a code block with CSV data, as a table:
```ts
import { Plugin } from "obsidian";
export default class ExamplePlugin extends Plugin {
async onload() {
this.registerMarkdownCodeBlockProcessor("csv", (source, el, ctx) => {
const rows = source.split("\n").filter((row) => row.length > 0);
const table = el.createEl("table");
const body = table.createEl("tbody");
for (let i = 0; i < rows.length; i++) {
const cols = rows[i].split(",");
const row = body.createEl("tr");
for (let j = 0; j < cols.length; j++) {
row.createEl("td", { text: cols[j] });
}
}
});
}
}
```
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