cruml

Warning

This tool is under development, it is not completely finished.

cruml (Crystal UML) is a tool that allows to generate an UML diagram. This is useful for all projects using the Crystal language that need to know their structure.

An UML class diagram representing the parent class linked to child classes.

Requirements

To do this, d2 should be installed in your machine.

Documentation source : https://d2lang.com/tour/install#install-script.

Compatibilities

Here is the compatibility table:

Cruml version	Crystal version
v0.8.x	from v1.16.x to v1.18.0
v0.7.1	v1.16.x and v1.17.x
v0.7.0	v1.16.x

Note

Table is subject to change.

Installation

1. Add the dependency to your shard.yml:

development_dependencies:
  cruml:
    github: tamdaz/cruml

2. Run shards install:

Once this tool installed, this will build a binary into bin/ directory in your project.

Usage

Usage : cruml [subcommand] [arguments] -- [options]
    config                           Configuration
    generate                         Generate the class diagram
    -v, --version                    Show the version
    -h, --help                       Show this help

Usage : cruml generate [arguments] -- [options]
    -v, --version                    Show the version
    -h, --help                       Show this help
    --verbose                        Enable verbose
    --dark-mode                      Set to dark mode
    --no-color                       Disable color output
    --path=PATH                      Path to specify
    --output-dir=DIR                 Directory path to save diagrams

Examples

For example, to generate a diagram with Crystal files from the src/models directory:

bin/cruml generate --path="src/models"

To generate a diagram with one Crystal file:

bin/cruml generate --path="src/models/user.cr"

Tip

You can use multiple --path flag to include several files or directories.

In addition, you can set your diagram to the dark mode thanks to --dark-mode flag:

bin/cruml generate --path="src/models" --dark-mode

If you don't want to colorize the diagram, you can use the --no-color flag:

bin/cruml generate --path="src/models" --no-color

Configuration

Flags are useful to generate the class diagram. In addition, you can use the YML config file to group namespaces, customize the color of the classifiers and add paths.

# Customizable colors to style the classifiers.
colors:
  light:
    classes: "#5016bb"
    abstract_classes: "#5ea012"
    interfaces: "#e28b19"
    modules: "#1158f3"
  dark:
    classes: "#2e1065"
    abstract_classes: "#365314"
    interfaces: "#af6300"
    modules: "#0041cc"

# Path to parse all Crystal files.
paths:
  - src/entities
  - src/controllers
  - src/services

# Specify the namespace for grouping the classes (recommended for organizing the class diagram).
namespaces:
  MyNamespace:
    - App::Services::ClassOne
    - App::Services::ClassTwo
    - App::Services::ClassThree

Thanks to this YML config, you will not need to use flags in the CLI, just run bin/cruml generate.

Troubleshooting

• The d2 program cannot display the multi-line method signature.
• Return type of a method should be indicated explicity, otherwise void will be displayed.

Contributing

1. Fork it (https://github.com/tamdaz/cruml/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

• tamdaz - creator and maintainer