Syntax Highlighting

undox provides syntax highlighting for 80+ programming languages using tree-sitter, the same parser used by GitHub, Neovim, and other modern editors.

Usage

Add a language identifier after the opening fence:

```rust
fn main() {
    println!("Hello, world!");
}
```

Renders as:

fn main() {
    println!("Hello, world!");
}

Supported Languages

Web Development

// JavaScript
const greeting = (name) => `Hello, ${name}!`;
export default greeting;

// TypeScript
interface User {
  name: string;
  age: number;
}

const greet = (user: User): string => `Hello, ${user.name}!`;

<!-- HTML -->
<!DOCTYPE html>
<html>
  <head><title>Hello</title></head>
  <body>
    <h1>Welcome</h1>
  </body>
</html>

/* CSS */
.container {
  display: flex;
  justify-content: center;
  background: linear-gradient(to right, #667eea, #764ba2);
}

Systems Programming

// Rust
use std::collections::HashMap;

fn main() {
    let mut scores: HashMap<&str, i32> = HashMap::new();
    scores.insert("Blue", 10);
    println!("{:?}", scores);
}

// Go
package main

import "fmt"

func main() {
    messages := make(chan string)
    go func() { messages <- "ping" }()
    fmt.Println(<-messages)
}

Scripting

# Python
def fibonacci(n: int) -> list[int]:
    fib = [0, 1]
    for i in range(2, n):
        fib.append(fib[i-1] + fib[i-2])
    return fib

print(fibonacci(10))

#!/bin/bash
# Bash
for file in *.md; do
    echo "Processing $file"
    wc -l "$file"
done

Data Formats

{
  "name": "undox",
  "version": "0.1.0",
  "features": ["markdown", "syntax-highlighting", "multi-repo"]
}

# YAML
site:
  name: "My Docs"
  url: "https://example.com"

sources:
  - name: docs
    path: ./content

Full Language List

undox supports these languages (and their common aliases):

Language	Identifiers
Bash	`bash`, `sh`, `shell`
C	`c`
C++	`cpp`, `c++`
C#	`csharp`, `cs`
CSS	`css`
Diff	`diff`
Elixir	`elixir`
Erlang	`erlang`
Go	`go`, `golang`
Haskell	`haskell`, `hs`
HTML	`html`
Java	`java`
JavaScript	`javascript`, `js`
JSON	`json`
Kotlin	`kotlin`, `kt`
Lua	`lua`
Markdown	`markdown`, `md`
Nix	`nix`
OCaml	`ocaml`
PHP	`php`
Python	`python`, `py`
Ruby	`ruby`, `rb`
Rust	`rust`, `rs`
Scala	`scala`
SQL	`sql`
Swift	`swift`
TypeScript	`typescript`, `ts`
TSX	`tsx`
XML	`xml`
YAML	`yaml`, `yml`
Zig	`zig`

...and 50+ more!

No Language Specified

Code blocks without a language identifier are rendered without highlighting:

This is plain text
No syntax highlighting applied

Theme

Syntax highlighting uses a GitHub Dark inspired color scheme that works well on both light and dark backgrounds.