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## Summary Minor documentation update to make `mypy_primer` instructions a bit more verbose/helpful for running against a local branch ## Test Plan N/A
69 lines
2.3 KiB
Markdown
69 lines
2.3 KiB
Markdown
# Running `mypy_primer`
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## Basics
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`mypy_primer` can be run using `uvx --from "…" mypy_primer`. For example, to see the help message, run:
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```sh
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uvx --from "git+https://github.com/hauntsaninja/mypy_primer" mypy_primer -h
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```
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Alternatively, you can install the forked version of `mypy_primer` using:
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```sh
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uv tool install "git+https://github.com/hauntsaninja/mypy_primer"
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```
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and then run it using `uvx mypy_primer` or just `mypy_primer`, if your `PATH` is set up accordingly (see: [Tool executables]).
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## Showing the diagnostics diff between two Git revisions
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To show the diagnostics diff between two Git revisions (e.g. your feature branch and `main`), run:
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```sh
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mypy_primer \
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--type-checker ty \
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--old origin/main \
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--new my/feature \
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--debug \
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--output concise \
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--project-selector '/black$'
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```
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This will show the diagnostics diff for the `black` project between the `main` branch and your `my/feature` branch. To run the
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diff for all projects we currently enable in CI, use `--project-selector "/($(paste -s -d'|' crates/ty_python_semantic/resources/primer/good.txt))\$"`.
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You can also take a look at the [full list of ecosystem projects]. Note that some of them might still need a `ty_paths` configuration
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option to work correctly.
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## Avoiding recompilation
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If you want to run `mypy_primer` repeatedly, e.g. for different projects, but for the same combination of `--old` and `--new`, you
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can use set the `MYPY_PRIMER_NO_REBUILD` environment variable to avoid recompilation of ty:
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```sh
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MYPY_PRIMER_NO_REBUILD=1 mypy_primer …
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```
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## Running from a local copy of the repository
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If you are working on a local branch, you can use `mypy_primer`'s `--repo` option to specify the path to your local copy of the `ruff` repository.
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This allows `mypy_primer` to check out local branches:
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```sh
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mypy_primer --type-checker ty \
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--repo ./ruff \
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--old main \
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--new my/local-branch \
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--project-selector '/beartype$' \
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--debug \
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--output concise
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```
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Notes:
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- You might need to clean up `/tmp/mypy_primer` in order for this to work correctly.
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- This must be run from _outside_ the `ruff` repo.
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[full list of ecosystem projects]: https://github.com/hauntsaninja/mypy_primer/blob/master/mypy_primer/projects.py
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[tool executables]: https://docs.astral.sh/uv/concepts/tools/#tool-executables
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