NOIR

Syntax Highlight Library for Crystal

Usage

Add to your shard.yml:

dependencies:
  noir:
    github: MakeNowJust/noir

Basic usage:

require "noir"

# Get a lexer by language name
lexer = Noir.find_lexer("xml")

# Choose a formatter (HTML, HTML-inline, or Terminal-RGB)
formatter = Noir::Formatters::HTML.new(io)

# Highlight the code
Noir.highlight(code, lexer: lexer, formatter: formatter)

Using with custom theme:

# Get a theme by name
theme = Noir.find_theme("monokai")

# Create HTML formatter with inline styles
formatter = Noir::Formatters::HTMLInline.new(theme, io)

# Highlight with custom theme
Noir.highlight(code, lexer: lexer, formatter: formatter)

Terminal output:

# Use Terminal-RGB formatter for colored console output
formatter = Noir::Formatters::TerminalRGB.new(theme, io)
Noir.highlight(code, lexer: lexer, formatter: formatter)

Supported Languages

NOIR supports syntax highlighting for the following languages:

• Crystal (.cr)
• CSS (.css)
• Elm (.elm)
• HTML (.html, .htm, .xhtml)
• JavaScript (.js)
• JSON (.json)
• Python (.py, .pyw)
• Ruby (.rb, .ruby, .rbw, .rake, .gemspec)
• SQL (.sql)
• XML (.xml, .xsl, .rss, .xslt, .xsd, .wsdl, .svg)

Supported Themes

NOIR comes with the following themes:

• Dracula - Dark theme with vibrant colors
• Monokai - Dark theme with bright colors
• Solarized - Light and dark variants available

CLI

ET NOIR is CLI tool for NOIR. It can be installed with these commands:

$ git clone https://github.com/MakeNowJust/noir
$ cd noir
$ make

Then bin/etnoir is available:

$ bin/etnoir
ET NOIR - NOIR command-line tool

Usage:
    etnoir highlight FILENAME
    etnoir style THEME

Command:
    highlight                        highlight FILENAME content
    style                            print THEME style as CSS
    help                            show this help
    version                         show ET NOIR version

Development

Adding a New Lexer

1. Create a new lexer file in src/noir/lexers/:

   require "../lexer"
   
   class Noir::Lexers::YourLexer < Noir::Lexer
     tag "yourlang"                    # Language tag
     aliases %w(yl)                    # Optional aliases
     filenames %w(*.yl *.yourlang)     # File extensions
     mimetypes %w(text/x-yourlang)     # MIME types
   
     state :root do
       # Define your lexer rules here
     end
   end

2. Add your lexer to etnoir/src/etnoir/lexers.cr

3. Create specs in spec/lexers/yourlang/:

   • Create test fixtures in spec/lexers/yourlang/fixtures/
   • Add yourlang_spec.cr with your test cases

Testing

Run specific lexer tests:

$ crystal spec spec/lexers/yourlang/

Update test fixtures:

$ UPDATE_FIXTURE=1 crystal spec spec/lexers/yourlang/

Run all tests:

$ crystal spec

Note

This project is heavily inspired by jneen/rouge.

License

MIT and 🍣 © TSUYUSATO "MakeNowJust" Kitsune <make.just.on@gmail.com> 2016-2017