tartrazine/README.md
2024-08-14 13:25:20 -03:00

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# TARTRAZINE
Tartrazine is a library to syntax-highlight code. It is
a port of [Pygments](https://pygments.org/) to
[Crystal](https://crystal-lang.org/). Kind of.
The CLI tool can be used to highlight many things in many styles.
# A port of what? Why "kind of"?
Pygments is a staple of the Python ecosystem, and it's great.
It lets you highlight code in many languages, and it has many
themes. Chroma is "Pygments for Go", it's actually a port of
Pygments to Go, and it's great too.
I wanted that in Crystal, so I started this project. But I did
not read much of the Pygments code. Or much of Chroma's.
Chroma has taken most of the Pygments lexers and turned them into
XML descriptions. What I did was take those XML files from Chroma
and a pile of test cases from Pygments, and I slapped them together
until the tests passed and my code produced the same output as
Chroma. Think of it as *extreme TDD*.
Currently the pass rate for tests in the supported languages
is `96.8%`, which is *not bad for a couple days hacking*.
This only covers the RegexLexers, which are the most common ones,
but it means the supported languages are a subset of Chroma's, which
is a subset of Pygments'.
Currently Tartrazine supports ... 241 languages.
It has 331 themes (63 from Chroma, the rest are base16 themes via
[Sixteen](https://github.com/ralsina/sixteen)
## Installation
From prebuilt binaries:
Each release provides statically-linked binaries that should
work on any Linux. Get them from the [releases page](https://github.com/ralsina/tartrazine/releases) and put them in your PATH.
To build from source:
1. Clone this repo
2. Run `make` to build the `tartrazine` binary
3. Copy the binary somewhere in your PATH.
## Usage
This works:
```crystal
require "tartrazine"
lexer = Tartrazine.lexer("crystal")
theme = Tartrazine.theme("catppuccin-macchiato")
puts Tartrazine::Html.new.format(File.read(ARGV[0]), lexer, theme)
```
## Contributing
1. Fork it (<https://github.com/ralsina/tartrazine/fork>)
2. Create your feature branch (`git checkout -b my-new-feature`)
3. Commit your changes (`git commit -am 'Add some feature'`)
4. Push to the branch (`git push origin my-new-feature`)
5. Create a new Pull Request
## Contributors
- [Roberto Alsina](https://github.com/ralsina) - creator and maintainer