135 lines
3.3 KiB
Markdown
135 lines
3.3 KiB
Markdown
---
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title: Syntax Highlighting
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tags:
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- plugin/transformer
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---
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Syntax highlighting in Quartz is completely done at build-time. This means that Quartz only ships pre-calculated CSS to highlight the right words so there is no heavy client-side bundle that does the syntax highlighting.
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And, unlike some client-side highlighters, it has a full TextMate parser grammar instead of using Regexes, allowing for highly accurate code highlighting.
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In short, it generates HTML that looks exactly like your code in an editor like VS Code. Under the hood, it's powered by [Rehype Pretty Code](https://rehype-pretty-code.netlify.app/) which uses [Shiki](https://github.com/shikijs/shiki).
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> [!warning]
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> Syntax highlighting does have an impact on build speed if you have a lot of code snippets in your notes.
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## Formatting
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Text inside `backticks` on a line will be formatted like code.
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````
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```ts
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export function trimPathSuffix(fp: string): string {
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fp = clientSideSlug(fp)
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let [cleanPath, anchor] = fp.split("#", 2)
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anchor = anchor === undefined ? "" : "#" + anchor
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return cleanPath + anchor
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}
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```
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````
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```ts
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export function trimPathSuffix(fp: string): string {
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fp = clientSideSlug(fp)
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let [cleanPath, anchor] = fp.split("#", 2)
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anchor = anchor === undefined ? "" : "#" + anchor
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return cleanPath + anchor
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}
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```
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### Titles
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Add a file title to your code block, with text inside double quotes (`""`):
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````
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```js title="..."
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```
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````
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```ts title="quartz/path.ts"
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export function trimPathSuffix(fp: string): string {
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fp = clientSideSlug(fp)
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let [cleanPath, anchor] = fp.split("#", 2)
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anchor = anchor === undefined ? "" : "#" + anchor
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return cleanPath + anchor
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}
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```
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### Line highlighting
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Place a numeric range inside `{}`.
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````
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```js {1-3,4}
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```
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````
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```ts {2-3,6}
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export function trimPathSuffix(fp: string): string {
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fp = clientSideSlug(fp)
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let [cleanPath, anchor] = fp.split("#", 2)
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anchor = anchor === undefined ? "" : "#" + anchor
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return cleanPath + anchor
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}
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```
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### Word highlighting
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A series of characters, like a literal regex.
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````
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```js /useState/
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const [age, setAge] = useState(50);
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const [name, setName] = useState('Taylor');
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```
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````
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```js /useState/
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const [age, setAge] = useState(50)
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const [name, setName] = useState("Taylor")
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```
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### Line numbers
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Syntax highlighting has line numbers configured automatically. If you want to start line numbers at a specific number, use `showLineNumbers{number}`:
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````
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```js showLineNumbers{number}
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```
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````
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```ts showLineNumbers{20}
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export function trimPathSuffix(fp: string): string {
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fp = clientSideSlug(fp)
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let [cleanPath, anchor] = fp.split("#", 2)
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anchor = anchor === undefined ? "" : "#" + anchor
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return cleanPath + anchor
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}
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```
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### Escaping code blocks
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You can format a codeblock inside of a codeblock by wrapping it with another level of backtick fences that has one more backtick than the previous fence.
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`````
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````
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```js /useState/
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const [age, setAge] = useState(50);
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const [name, setName] = useState('Taylor');
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```
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````
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`````
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## Customization
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- Removing syntax highlighting: delete all usages of `Plugin.SyntaxHighlighting()` from `quartz.config.ts`.
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- Style: By default, Quartz uses derivatives of the GitHub light and dark themes. You can customize the colours in the `quartz/styles/syntax.scss` file.
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- Plugin: `quartz/plugins/transformers/syntax.ts`
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