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Plugin for Poetry to enable dynamic versioning based on VCS tags
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README.md

Dynamic versioning plugin for Poetry

This package is a plugin for Poetry to enable dynamic versioning based on tags in your version control system, powered by Dunamai.

Since Poetry does not yet officially support plugins (refer to this issue) as of the time of writing on 2019-06-04, this package takes some novel liberties to make the functionality possible. As soon as official support lands, this plugin will be updated to do things the official way.

Installation

Python 3.5 or newer is required.

  • Run pip install poetry-dynamic-versioning
  • Add this to your pyproject.toml:
    [tool.poetry-dynamic-versioning]
    enable = true

Note that you must install the plugin in your global Python installation, not as a dependency in pyroject.toml, because the virtual environment that Poetry creates cannot see Poetry itself and therefore cannot patch it.

Configuration

In your pyproject.toml file, you may configure the following options:

  • [tool.poetry-dynamic-versioning]: General options.
    • enable: Boolean. Default: false. Since the plugin has to be installed globally, this setting is an opt-in per project. This setting will likely be removed once plugins are officially supported.
    • vcs: String. This is the version control system to check for a version. One of: any (default), git, mercurial, darcs, bazaar, subversion.
    • metadata: Boolean. Default: unset. If true, include the commit hash in the version, and also include a dirty flag if dirty is true. If unset, metadata will only be included if you are on a commit without a version tag.
    • dirty: Boolean. Default: false. If true, include a dirty flag in the metadata, indicating whether there are any uncommitted changes.
    • pattern: String. This is a regular expression which will be used to find a tag representing a version. There must be a named capture group base with the main part of the version, and optionally you can also have groups named pre_type and pre_number for prereleases. The default is v(?P<base>\d+\.\d+\.\d+)((?P<pre_type>[a-zA-Z]+)(?P<pre_number>\d+))?.
    • format: String. Default: unset. This defines a custom output format for the version. Available substitutions:
      • {base}
      • {epoch}
      • {pre_type}
      • {pre_number}
      • {post}
      • {dev}
      • {commit}
      • {dirty}
    • style: String. Default: unset. One of: pep440, semver, pvp. These are preconfigured output formats. If you set both a style and format, then the format will be validated against the style's rules. If style is unset, the default output format will follow PEP 440, but a custom format will only be validated if style is set explicitly.
    • latest-tag: Boolean. Default: false. If true, then only check the latest tag for a version, rather than looking through all the tags until a suitable one is found to match the pattern.
  • [tool.poetry-dynamic-versioning.subversion]: Options specific to Subversion.
    • tag-dir: String. Default: tags. This is the location of tags relative to the root.

Simple example:

[tool.poetry-dynamic-versioning]
enable = true
vcs = "git"
style = "semver"

Implementation

In order to side-load plugin functionality into Poetry, this package does the following:

  • Upon installation, it delivers a zzz_poetry_dynamic_versioning.pth file to your Python site-packages directory. This forces Python to automatically load the plugin after all other modules have been loaded (or at least those alphabetically prior to zzz).
  • It patches builtins.__import__ so that, whenever the first import from Poetry finishes, poetry.console.main will be patched. The reason we have to wait for a Poetry import is in case you've used the get-poetry.py script, in which case there is a gap between when Python is fully loaded and when ~/.poetry/bin/poetry adds the Poetry lib folder to the PYTHONPATH.
  • The patched version of poetry.console.main will then, when called, additionally patch poetry.poetry.Poetry.create to replace the version from your pyproject.toml file with the dynamically generated version.

Development

This project is managed using Poetry. Development requires Python 3.6+ because of Black.

  • If you want to take advantage of the default VSCode integration, then first configure Poetry to make its virtual environment in the repository:
    poetry config settings.virtualenvs.in-project true
    
  • After cloning the repository, activate the tooling:
    poetry install
    poetry run pre-commit install
    
  • Run unit tests:
    poetry run pytest --cov
    poetry run tox
    
  • Run integration tests:
    ./tests/integration.sh
    
    Git Bash is recommended for Windows.
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