Lib.rs

Catppuccin Whiskers

A templating tool to simplify the creation of Catppuccin ports.

Installation

You can install Whiskers using one of the methods below:

Usage

Whiskers is a port creation helper tool that is custom-built for Catppuccin, allowing developers to define template files which the palette can be injected into.

$ whiskers --help
Soothing port creation tool for the high-spirited!

Usage: whiskers [OPTIONS] [TEMPLATE]

Arguments:
  [TEMPLATE]
          Path to the template file, or - for stdin

Options:
  -f, --flavor <FLAVOR>
          Render a single flavor instead of all four
          
          [possible values: latte, frappe, macchiato, mocha]

      --color-overrides <COLOR_OVERRIDES>
          Set color overrides

      --overrides <OVERRIDES>
          Set frontmatter overrides

      --check [<EXAMPLE_PATH>]
          Instead of creating an output, check it against an example
          
          In single-output mode, a path to the example file must be provided. In multi-output mode, no path is required and, if one is provided, it will be ignored.

      --dry-run
          Dry run, don't write anything to disk

  -l, --list-functions
          List all Tera filters and functions

  -o, --output-format <OUTPUT_FORMAT>
          Output format of --list-functions
          
          [default: json]
          [possible values: json, yaml, markdown, markdown-table]

  -h, --help
          Print help (see a summary with '-h')

  -V, --version
          Print version

Template

Please familiarize yourself with Tera, which is the templating engine used in Whiskers.

Naming Convention

Whiskers imposes no restrictions on template names. However, we recommend you use one the following options:

• <port name>.tera in the repo root for ports that only need one template.
  • For example the lazygit port uses lazygit.tera
• templates/<file name>.tera especially for ports that have multiple templates.
  • For example, a port that generates files called ui.cfg and palette.cfg could use templates/ui.tera and templates/palette.tera respectively.

These conventions exist to make it easier for contributors to find templates and to give code editors a hint about the correct file type.

Context Variables

The following variables are available for use in your templates:

Single-Flavor Mode

Multi-Flavor Mode

Types

These types are designed to closely match the palette.json.

Flavor

Color

RGB

HSL

Functions

Filters

[!NOTE] You also have access to all of Tera's own built-in filters and functions. See the Tera documentation for more information.

Frontmatter

Whiskers templates may include a frontmatter section at the top of the file.

The frontmatter is a YAML block that contains metadata about the template. If present, the frontmatter section must be the first thing in the file and must take the form of valid YAML set between triple-dashed lines.

Template Version

The most important frontmatter key is the Whiskers version. This key allows Whiskers to ensure that it is rendering a template that it can understand.

Example:

---
whiskers:
  version: "2.0.0"
---
... standard template content goes here ...

If the version key is not present, Whiskers will display a warning and attempt to render the template anyway. However, it is recommended to always include the version key to ensure compatibility with future versions of Whiskers.

Frontmatter Variables

You can also include additional context variables in the templating process by adding them to your template's frontmatter.

As a simple example, given the following template (example.tera):

---
app: 'Pepperjack'
author: 'winston'
---
# Catppuccin for {{app}}
# by {{author}}
bg = '{{base.hex}}'
fg = '{{text.hex}}'

Running whiskers example.tera -f mocha produces the following output:

# Catppuccin for Pepperjack
# by winston
bg = '1e1e2e'
fg = 'cdd6f4'

A common use of frontmatter is setting an accent color for the theme:

---
accent: "mauve"
---
{% set darkGreen = green | sub(lightness=30) %}
bg = "#{{base.hex}}"
fg = "#{{text.hex}}"
border = "#{{flavor.colors[accent].hex}}"
diffAddFg = "#{{green.hex}}"
diffAddBg = "#{{darkGreen.hex}}"

Rendering the above template produces the following output:

bg = "#1e1e2e"
fg = "#cdd6f4"
border = "#cba6f7"
diffaddfg = "#a6e3a1"
diffaddbg = "#40b436"

Overrides

Frontmatter overrides can also be specified through the cli via the --overrides flag, taking in a JSON string resembling the frontmatter. This is particularly useful with build scripts to automatically generate files for each accent:

example.tera

---
accent: "mauve"
---
theme:
  accent: "{{flavor.colors[accent].hex}}"

When running whiskers example.tera -f latte --overrides '{"accent": "pink"}', the accent will be overridden to pink.

Color Overrides

Color overrides can be specified through the cli via the --color-overrides flag. This flag takes a JSON string like the following:

{
  "all": {
    "text": "ff0000"
  },
  "mocha": {
    "base": "000000",
    "mantle": "010101",
    "crust": "020202",
  }
}

Passing these overrides would set the text color to bright red for all flavors, and the base, mantle, and crust colors to black/near-black for Mocha.

Single-Flavor Mode

Running Whiskers with the --flavor/-f flag causes it to run in single-flavor mode. This means the chosen flavor is placed into the template context as flavor and, for convenience, all of its colors are also placed into the context as their respective identifiers (red, surface0, et cetera.)

Multi-Flavor Mode

Running Whiskers without the --flavor/-f flag causes it to run in multi-flavor mode. In this mode, all flavors are placed into the template context as a map of flavor identifiers to their respective Flavor objects.

This map can be iterated like so:

{% for id, flavor in flavors %}
{{id}} is one of "latte", "frappe", "macchiato", or "mocha".
{{flavor}} is an object containing the flavor's properties and colors.
{% endfor %}

Please see the examples/single-file directory for more concrete examples on how it can be used.

Template Matrix

Whiskers can render multiple outputs from a single template using a matrix set in the frontmatter. This can be useful for generating one output per flavor per accent color, for example.

In this mode Whiskers will render directly into a set of files as specified by the filename key in the frontmatter. This can be disabled with the --dry-run flag, in which case Whiskers will render the templates but not actually write them anywhere.

The matrix is defined as a list of iterables. Whiskers will generate a file for each combination of the iterables in the matrix.

Some of the iterables in the matrix can be strings without any values provided. In this case, Whiskers will treat it as a "magic iterable", which is an iterable that Whiskers can automatically generate values for before rendering the template.

The following magic iterables are supported:

• flavor: latte, frappe, macchiato, mocha
• accent: rosewater, flamingo, pink, mauve, red, maroon, peach, yellow, green, teal, sky, sapphire, blue, lavender

Example:

---
whiskers:
  version: 2.0.0
  matrix:
    - variant: ["normal", "no-italics"]
    - flavor
    - accent
  filename: "catppuccin-{{flavor.identifier}}-{{accent}}-{{variant}}.ini"
---
# Catppuccin {{flavor.name}}{% if variant == "no-italics" %} (no italics){% endif %}
[theme]
{{accent}}: #{{flavor.colors[accent].hex}}

Running whiskers template.tera will generate the following files:

catppuccin-latte-rosewater-normal.ini
catppuccin-latte-rosewater-no-italics.ini
catppuccin-latte-flamingo-normal.ini
catppuccin-latte-flamingo-no-italics.ini
...
catppuccin-frappe-rosewater-normal.ini
catppuccin-frappe-rosewater-no-italics.ini

... and so on for every combination of flavor, accent, and variant. Notice that the filenames are generated by rendering the filename key in the frontmatter for each combination of the matrix iterables.

Check Mode

You can use Whiskers as a linter with check mode. To do so, set the --check option. Whiskers will render your template as per usual, but then instead of printing the result it will check it against the expected output and fail with exit code 1 if they differ.

This is especially useful in CI pipelines to ensure that the generated files are not changed without a corresponding change to the templates.

In single-flavor mode, you must provide the path to the expected output file as an argument to the --check option. In multi-flavor mode, the path is unnecessary and will be ignored.

Whiskers will diff the output against the check file using the program set in the DIFFTOOL environment variable, falling back to diff if it's not set. The command will be invoked as $DIFFTOOL <actual> <expected>.

$ whiskers theme.tera latte --check themes/latte.cfg
(no output, exit code 0)

$ whiskers theme.tera latte --check themes/latte.cfg
Templating would result in changes.
4c4
< accent is #ea76cb
---
> accent is #40a02b

(exit code 1)

Editor Support

Tera's syntax is not natively supported by most editors. Some editors have extensions available that provide syntax highlighting and other features for Tera templates. In the case that your editor does not have a viable extension available, you can try using a Jinja extension instead. While not an exact match, Tera's syntax is similar enough to Jinja's that it can be used quite well in most cases.

For Visual Studio Code users we recommend the Better Jinja extension.

Further Reading

• See the examples directory which further showcase the utilities and power of whiskers.
• See the RFC, CAT-0003-Whiskers, to understand the motivation behind creating whiskers.

Copyright © 2023-present Catppuccin Org