colorprofile

A simple, powerful—and at times magical—library for detecting terminal color profiles and performing color (and CSI) degradation.

This is a Crystal port of github.com/charmbracelet/colorprofile. The original Go source code is available in the vendor/ directory as a git submodule.

Installation

1. Add the dependency to your shard.yml:

   dependencies:
     colorprofile:
       github: dsisnero/colorprofile
   

2. Run shards install

Usage

Detecting the terminal's color profile

Detecting the terminal's color profile is easy.

require "colorprofile"

# Detect the color profile.
profile = Colorprofile.detect(STDOUT, ENV.to_h)

# Comment on the profile.
case profile
when Colorprofile::Profile::TrueColor
  puts "You know, your colors are quite fancy."
when Colorprofile::Profile::ANSI256
  puts "You know, your colors are quite 1990s fancy."
when Colorprofile::Profile::ANSI
  puts "You know, your colors are quite normcore."
when Colorprofile::Profile::ASCII
  puts "You know, your colors are quite ancient."
when Colorprofile::Profile::NoTTY
  puts "You know, your colors are quite naughty!"
end

Downsampling colors

When necessary, colors can be downsampled to a given profile.

profile = Colorprofile.detect(STDOUT, ENV.to_h)
color = Color::RGBA.new(0x6b, 0x50, 0xff, 0xff) # #6b50ff

# Downsample to the detected profile, when necessary.
converted_color = profile.convert(color)

# Or manually convert to a given profile.
ansi256_color = Colorprofile::Profile::ANSI256.convert(color)
ansi_color = Colorprofile::Profile::ANSI.convert(color)
no_color = Colorprofile::Profile::ASCII.convert(color)
no_ansi = Colorprofile::Profile::NoTTY.convert(color)

Automatic downsampling with a Writer

You can also magically downsample colors in ANSI output, when necessary. If output is not a TTY, ANSI will be dropped entirely.

my_fancy_ansi = "\e[38;2;107;80;255mCute \e[1;3mpuppy!!\e[m"

# Automatically downsample for the terminal at stdout.
writer = Colorprofile::Writer.new(STDOUT, ENV.to_h)
writer.write(my_fancy_ansi.to_slice)

# Downsample to 4-bit ANSI.
writer.profile = Colorprofile::Profile::ANSI
writer.write(my_fancy_ansi.to_slice)

# Ascii-fy, no colors.
writer.profile = Colorprofile::Profile::ASCII
writer.write(my_fancy_ansi.to_slice)

# Strip ANSI altogether.
writer.profile = Colorprofile::Profile::NoTTY
writer.write(my_fancy_ansi.to_slice) # not as fancy

Development

Run make help to see available targets:

• make install - Install dependencies
• make test - Run tests
• make format - Format code
• make lint - Run linter (ameba)

Contributing

1. Fork it (https://github.com/dsisnero/colorprofile/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

Attribution

This project is a Crystal port of the Go library charmbracelet/colorprofile. All credit for the original design and implementation goes to the Charmbracelet team.

License

MIT License - see LICENSE for details.

Contributors

• Dominic Sisneros - creator and maintainer of the Crystal port