pymermaider

pymermaider

pymermaider is a tool written in Rust designed to generate mermaid.js class diagrams from Python code. By analyzing Python code, pymermaider automatically generates mermaid.js-compatible diagrams that represent the class structures, including classes, methods, attributes, and their relationships. This tool aims to simplify the documentation process for Python projects, making it easier to visualize class hierarchies and relationships.

Features

• Automatic Class Diagram Generation: Generate detailed class diagrams from Python codebases with minimal configuration.
• Mermaid.js Compatibility: Outputs diagrams in mermaid.js markdown syntax, ready to be embedded in your markdown documents or rendered using mermaid.js tools. GitHub supports this natively as you'll see below!

Installation

pymermaider is available on PYPI:

# With pip.
pip install pymermaider

# With pipx.
pipx install pymermaider

Usage

pymermaider [OPTIONS] <PATH>

Arguments

• <PATH> The path to a file or directory to process.

Options

• -m, --multiple-files When processing a directory, this option will generate an individual Mermaid file for each file within the directory.

• -o, --output-dir <OUTPUT> Specify the output directory for the generated Mermaid files. Defaults to ./output if not provided.

• -h, --help Display help information for the command.

• -V, --version Show the current version of pymermaider.

File Selection:

• --exclude <FILE_PATTERN>: Excludes specific files and/or directories from being analyzed.
• --extend-exclude <FILE_PATTERN>: Similar to --exclude, but adds additional files and directories to exclude on top of those already specified.

Example for --extend-exclude:

pymermaider /path/to/dir --extend-exclude "**/tests/*,**/docs/*"

This command will exclude any folders within the subdirectories of /path/to/dir that are named tests or docs.

---

NOTES:

• Some codebases are so massive that processing the directory into one file will result in mermaid code that's too large to render. By default, it's 50,000 characters. This is a good reason for the -m flag. You can break class diagrams apart more easily into multiple renderings.

Example

Given a Python file example.py with the following content:

class Animal:
    def __init__(self, name: str) -> None:
        self.name = name

class Dog(Animal):
    def bark(self) -> str:
        return "Woof!"

Running pymermaider on this file will provide:

classDiagram
    class Animal {
        - __init__(self, name) None
    }

    class Dog {
        + bark(self) str
    }

    Dog --|> Animal

Future Additions

• Output directory option ✅
• Better output file naming convention ✅
• Import resolution (sorta-kinda implemented now, but not good enough or even used yet)
• More language support, maybe?? 😳🤔
• Sort classes with relationships to be grouped together
• Test suites!

Known Issues

• methods with property-setter decorators can be confusing in the output

Contributing

Contributions are more than welcome, just make a PR and we'll go from there!

License

This project is licensed under the MIT license. Please see the LICENSE file for more details.