Autumnus

Autumnus is a syntax highlighter powered by Tree-sitter and Neovim themes. It provides beautiful and accurate syntax highlighting for over 70 programming languages with support for over 100 themes.

Features

• 🎨 Over 100 themes including popular ones like:
  • Dracula, Catppuccin, Tokyo Night, Gruvbox
  • GitHub themes (light/dark)
  • Solarized variants
  • Nord, OneDark, and many more
• 🌳 Tree-sitter powered syntax highlighting with specialized scoping
• 📝 Support for 70+ programming languages
• 🎯 Multiple output formats:
  • HTML with inline styles
  • HTML with linked stylesheets
  • HTML with multiple themes (light/dark or custom)
  • Terminal output with ANSI colors
• 🔍 Automatic language detection from file extensions
• 🚀 Zero configuration needed to get started
• 🖥️ Command-line interface included

Installation

As a Library

Add Autumnus to your Cargo.toml:

[dependencies]
autumnus = "0.7"

Selective Language Support

By default, Autumnus includes support for all languages, which can result in longer compilation times. You can reduce compilation time and binary size by enabling only the languages you need:

[dependencies]
autumnus = { version = "0.7", default-features = false, features = ["lang-rust", "lang-javascript", "lang-python"] }

Available language features:

• lang-angular - Angular templates
• lang-asm - Assembly
• lang-astro - Astro framework
• lang-bash - Bash/Shell scripts
• lang-c - C programming language
• lang-caddy - Caddy
• lang-clojure - Clojure
• lang-cmake - CMake build files
• lang-comment - Comment highlighting
• lang-commonlisp - Common Lisp
• lang-cpp - C++
• lang-csharp - C#
• lang-css - CSS stylesheets
• lang-csv - CSV files
• lang-dart - Dart
• lang-diff - Diff/patch files
• lang-dockerfile - Docker files
• lang-eex - Elixir EEx templates
• lang-ejs - EJS templates
• lang-elixir - Elixir
• lang-elm - Elm
• lang-erb - ERB templates
• lang-erlang - Erlang
• lang-fish - Fish
• lang-fsharp - F#
• lang-gleam - Gleam
• lang-glimmer - Glimmer/Handlebars
• lang-go - Go
• lang-graphql - GraphQL
• lang-haskell - Haskell
• lang-hcl - HCL/Terraform
• lang-heex - Phoenix HEEx templates
• lang-html - HTML
• lang-iex - Elixir IEx
• lang-java - Java
• lang-javascript - JavaScript
• lang-json - JSON
• lang-kotlin - Kotlin
• lang-latex - LaTeX
• lang-liquid - Liquid templates
• lang-llvm - LLVM IR
• lang-lua - Lua
• lang-make - Makefiles
• lang-markdown - Markdown
• lang-markdown-inline - Inline Markdown
• lang-nix - Nix
• lang-objc - Objective-C
• lang-ocaml - OCaml
• lang-ocamlinterface - OCaml Interface
• lang-perl - Perl
• lang-php - PHP
• lang-plaintext - Plain Text
• lang-powershell - PowerShell
• lang-protobuf - Protocol Buffers
• lang-python - Python
• lang-r - R
• lang-regex - Regular expressions
• lang-ruby - Ruby
• lang-rust - Rust
• lang-scala - Scala
• lang-scss - SCSS
• lang-sql - SQL
• lang-surface - Phoenix Surface
• lang-svelte - Svelte
• lang-swift - Swift
• lang-toml - TOML
• lang-tsx - TypeScript JSX
• lang-typescript - TypeScript
• lang-typst - Typst
• lang-vim - Vim script
• lang-vue - Vue.js
• lang-xml - XML
• lang-yaml - YAML
• lang-zig - Zig

Or use the convenience feature to enable all languages:

[dependencies]
autumnus = { version = "0.7", features = ["all-languages"] }

As a CLI Tool

Install the autumnus command-line tool:

cargo install autumnus

Faster CLI Installation with Selective Languages

For faster compilation, you can install the CLI with only the languages you need:

# Install with only specific languages
cargo install autumnus --no-default-features --features "lang-rust,lang-python,lang-javascript"

# Install with web development languages
cargo install autumnus --no-default-features --features "lang-html,lang-css,lang-javascript,lang-typescript,lang-json"

# Install with all languages (same as default)
cargo install autumnus --features "all-languages"

This can significantly reduce compilation time, especially on slower machines or CI environments.

Usage

Library Usage

Basic Example

use autumnus::{highlight, Options};

let code = r#"
    function greet(name) {
        console.log(`Hello ${name}!`);
    }
"#;

let html = highlight("javascript", code, Options::default());

Using a Specific Theme

use autumnus::{highlight, Options, themes::Theme};

let code = "SELECT * FROM users WHERE active = true;";

// Parse theme from string
let theme: Theme = "dracula".parse().expect("Theme not found");
// Or: let theme = themes::get("dracula").expect("Theme not found");

let html = highlight(
    "sql",
    code,
    Options {
        theme,
        ..Options::default()
    }
);

Language Detection from File Path

use autumnus::{highlight, Options};

let code = r#"
    defmodule MyApp do
      def hello, do: :world
    end
"#;
// Language will be automatically detected as Elixir from the .ex extension
let html = highlight("app.ex", code, Options::default());

Terminal Output with ANSI Colors

use autumnus::{highlight, Options, FormatterOption};

let code = "puts 'Hello from Ruby!'";
let ansi = highlight(
    "ruby",
    code,
    Options {
        formatter: FormatterOption::Terminal,
        ..Options::default()
    }
);

HTML with Linked Stylesheets

use autumnus::{highlight, Options, FormatterOption};

let code = "console.log('Hello!')";
let html = highlight(
    "javascript",
    code,
    Options {
        formatter: FormatterOption::HtmlLinked,
        ..Options::default()
    }
);

When using FormatterOption::HtmlLinked, include the corresponding CSS file for your chosen theme:

<link rel="stylesheet" href="css/dracula.css" />

Command-Line Usage

The autumnus command-line tool provides several commands for syntax highlighting and code analysis:

List Available Languages

autumnus list-languages

Lists all supported programming languages and their associated file patterns.

List Available Themes

autumnus list-themes

Lists all available syntax highlighting themes.

Highlight a File

autumnus highlight <path> [options]

Highlights the contents of a file with syntax highlighting.

Options:

• -f, --formatter <formatter>: Output format (default: terminal)
  • terminal: ANSI colored output for terminal
  • html-inline: HTML output with inline styles
  • html-linked: HTML output with linked stylesheet
• -t, --theme <theme>: Theme name (default: catppuccin_frappe)

Example:

autumnus highlight src/main.rs --formatter html-inline --theme github_dark

Highlight Source Code

autumnus highlight-source <source> [options]

Highlights a string of source code.

Options:

• -l, --language <language>: Programming language for the source code
• -f, --formatter <formatter>: Output format (default: terminal)
• -t, --theme <theme>: Theme name (default: catppuccin_frappe)

Example:

autumnus highlight-source "println!(\"Hello World!\");" -l rust

Dump Tree-sitter AST

autumnus dump-tree-sitter <path>

Dumps the Tree-sitter AST (Abstract Syntax Tree) for a given file. This is useful for debugging or understanding how Tree-sitter parses your code.

Generate Theme

autumnus gen-theme --url <git-url> --colorscheme <name> [options]

Generates a theme JSON file from any Git repository containing a Neovim theme.

Note: Requires nvim to be installed and available in $PATH.

Required options:

• --url <git-url>: Git repository URL (e.g., https://github.com/catppuccin/nvim)
• --colorscheme <name>: Colorscheme name to activate (e.g., catppuccin-mocha)

Optional:

• --setup <lua-code>: Custom Lua setup code to run before activating the colorscheme
• -o, --output <path>: Output file path (prints to stdout if not specified)
• --appearance <light|dark>: Theme appearance (defaults to dark)

Examples:

# Basic usage - output to stdout
autumnus gen-theme --url https://github.com/catppuccin/nvim --colorscheme catppuccin-mocha

# Save to file
autumnus gen-theme \
  --url https://github.com/folke/tokyonight.nvim \
  --colorscheme tokyonight \
  -o tokyonight.json

# With custom setup code
autumnus gen-theme \
  --url https://github.com/ellisonleao/gruvbox.nvim \
  --colorscheme gruvbox \
  --setup "require('gruvbox').setup({ contrast = 'hard' })" \
  -o gruvbox-hard.json

# Specify light appearance
autumnus gen-theme \
  --url https://github.com/projekt0n/github-nvim-theme \
  --colorscheme github_light \
  --appearance light \
  -o github-light.json

See themes/README.md for more details on theme generation.

Supported Languages

Check the documentation for a complete list of supported languages and file extensions.

Available Themes

Autumnus includes over 100 themes, such as:

• Dracula and Dracula Soft
• Catppuccin (Mocha, Macchiato, Frappe, Latte)
• GitHub themes (Light/Dark, High Contrast, Colorblind)
• Gruvbox (Light/Dark variants)
• Nord
• OneDark variants
• Rose Pine
• Solarized variants
• Tokyo Night variants
• And many more!

Check the documentation for a complete list of supported themes.

Contributing

Contributions are welcome! Feel free to:

• Report bugs
• Suggest new features
• Add new themes
• Add support for new languages
• Improve documentation

Acknowledgements

Autumnus would not be possible without these projects:

• inkjet
• difftastic
• Learn X in Y minutes