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 (howto_format)=
 
 # Source code formatting
 
 
 ## Setting up pre-commit hooks
 
 Acts comes with a [`pre-commit`](https://pre-commit.com/) configuration file to enable pre-commit hooks.
 In order to use them, one has to install the `pre-commit` package. At the time of writing, the `pre-commit v4.5.0` works with the Acts hooks. It could be that your system has a `pre-commit` installation with an older version, i.e. some `LCG` views use an old version that is incompatible with Acts. The best way is to have `pre-commit` installed in a venv and use that at time of commit. Here are some instruction on how to set it up and make sure to call it.
 
 - Create a python virtual environment and activate it
 ```console
 python -m venv ~/.venvs/commit-env
 source ~/.venvs/precommit-env/bin/activate
 ```
 
 - Install pre-commit inside the venv and verify the version
 ```console
 pip install --upgrade pip
 pip install pre-commit
 pre-commit --version
 ```
 
 - Optional: Setup a wrapper around pre-commit to use a clean `PYTHONPATH`. This avoids
 conflicts with external setups, like lcg-views.
 ```console
 
 # Change script name
 mv $VIRTUAL_ENV/bin/pre-commit $VIRTUAL_ENV/bin/pre-commit-real
 
 # Make a wrapper to run with clearn PYTHONPATH
 cat > $VIRTUAL_ENV/bin/pre-commit << 'EOF'
 #!/bin/bash
 # Clean PYTHONPATH only for this process
 PYTHONPATH="" exec "$VIRTUAL_ENV/bin/python" -m pre_commit "$@"
 EOF
 
 # Make it executable
 chmod +x $VIRTUAL_ENV/bin/pre-commit
 ```
 
 One can then setup an external setup, e.g LCG, for compilation and running. This step can
 be avoided if one uses two shells, one for developing and one for committing.
 
 - Go the acts repo and, while inside the venv, install the git hook
 ```console
 pre-commit install
 ```
 This adds a hook `.git/hooks/pre-commit` which automatically calls `pre-commit`
 
 - At this point, `git commit` should pick up the pre-commit and run the formatting tools and apply corrections.
 If some files were modified, then just `git add` and `git commit` again to pick the changes.
 
 ### Execution
 ```console
 cd acts/
 pre-commit run --all-files
 ```
 
 ## C++ formatting: `clang-format`
 
 Code formatting is handled by
 [`clang-format`](https://clang.llvm.org/docs/ClangFormat.html). A configuration
 file is available in the repository root at `.clang-format` and should be used
 to automatically format the code. Many editors / IDEs support `clang-format`
 and also format-on-save actions.
 
 The ACTS CI system will automatically check code formatting using the provided
 `clang-format` configuration and will notify incompatible formatting.
 
 To simplify this, a script located in `CI/check_format` can be used like:
 
 ```console
 $ CI/check_format $SOURCE_DIR
 ```
 
 In some cases, different `clang-format` versions will result in slightly
 different outputs. In many cases, this is accepted by the CI. However, it is
 recommended to use the same major version of `clang-format` to perform local
 formatting. Options to obtain a compatible `clang-format` version
 are to use your package manager (e.g. Ubuntu distributions usually offer a set of
 versions to install), or to use statically linked binaries from
 [here](https://github.com/muttleyxd/clang-tools-static-binaries)[^1] and use them with:
 
 ```console
 CLANG_FORMAT_BINARY=<path/to/clang-format> CI/check_format $SOURCE_DIR
 ```
 
 You can also download the required changes by clicking on *Summary* on the top left-hand
 portion of the CI job and scrolling down to the bottom of the page (see *Changed*).
 However, it is suggested to run the `CI/check_format` locally before committing, to not
 clog the shared resources with repeated checks.
 
 ## Python formatting
 
 Formatting of the Python source code uses the library
 [`black`](https://github.com/psf/black). To run it, you can locally install the
 `black` package. You can use `pip` to install it:
 
 ```console
 $ pip install black
 $ black <source>
 ```
 
 :::{tip}
 It is **strongly recommended** to use a [virtual
 environment](https://realpython.com/python-virtual-environments-a-primer/) for
 this purpose! For example, run
 
 ```console
 $ python -m venv venv
 $ source venv/bin/activate
 ```
 
 and then install and use black. You can also use a tool like
 [`pipx`](https://github.com/pypa/pipx) to simplify this.
 :::
 
 [^1]: This repository is external to the ACTS project, so proceed with caution!

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