docs: add guide for using pixi with lefthook, pre-commit, and prek (#…

docs/integration/third_party/git_hooks.md

@@ -0,0 +1,127 @@
+# Git Hooks
+
+When working with `pixi`, you might want to use Git hooks to ensure that your code is formatted and linted properly before committing or pushing it.
+Since `pixi` manages your environment, you can use these tools to run your checks within the `pixi` environment, ensuring that everyone on your team is using the same tools and versions without the overhead of downloading duplicate virtual environments.
+
+We recommend using a Git hook manager to manage your hooks. The most popular ones are [Lefthook](https://github.com/evilmartians/lefthook), [pre-commit](https://pre-commit.com/), and [prek](https://github.com/j178/prek).
+## Lefthook
+
+[Lefthook](https://github.com/evilmartians/lefthook) is a fast and powerful Git hooks manager for any type of project.
+
+To use Lefthook with `pixi`, you can add it to your project's dependencies:
+
+```shell
+pixi add lefthook
+```
+
+Then, initialize and configure `lefthook` by creating a `lefthook.yaml` file in the root of your project:
+
+```yaml title="lefthook.yaml"
+# Run lefthook via pixi
+lefthook: pixi run --no-progress lefthook
+no_auto_install: true
+
+# Use template for `run` so we don't have to repeat the flags
+templates:
+  run: run --quiet --no-progress --as-is
+
+pre-commit:
+  parallel: true
+  jobs:
+    - name: pixi-install
+      run: pixi install
+    - group:
+        parallel: true
+        jobs:
+          - name: ruff-check
+            glob: "*.{py,pyi}"
+            run: pixi {run} ruff check --fix --exit-non-zero-on-fix --force-exclude {staged_files}
+          - name: ruff-format
+            glob: "*.{py,pyi}"
+            run: pixi {run} ruff format --force-exclude {staged_files}
+```
+
+Make sure to install the hooks into your Git repository:
+
+```shell
+pixi run lefthook install
+```
+
+With this configuration, Lefthook will use `pixi run` to execute your hooks, ensuring they run within the correct environment. The `--quiet` and `--no-progress` flags are useful to avoid cluttering the output.
+
+## pre-commit
+
+[pre-commit](https://pre-commit.com/) is a framework for managing and maintaining multi-language pre-commit hooks.
+
+You can add `pre-commit` to your project:
+
+```shell
+pixi add pre-commit
+```
+
+Create a `.pre-commit-config.yaml` file in the root of your project:
+
+```yaml title=".pre-commit-config.yaml"
+repos:
+  - repo: local
+    hooks:
+      - id: ruff-check
+        name: ruff-check
+        entry: pixi run --quiet --no-progress ruff check --force-exclude
+        language: system
+        types_or: [python, pyi]
+        require_serial: true
+      - id: ruff-format
+        name: ruff-format
+        entry: pixi run --quiet --no-progress ruff format --force-exclude
+        language: system
+        types_or: [python, pyi]
+        require_serial: true
+```
+
+Install the `pre-commit` hooks into your repository:
+
+```shell
+pixi run pre-commit install
+```
+
+By defining the hooks as `local` and `language: system`, `pre-commit` will not try to manage the environments itself, but will instead rely on `pixi run` to execute the commands within the `pixi` environment.
+
+
+!!! tip "Using pre-commit in CI"
+    This approach is **not compatible with [pre-commit.ci](https://pre-commit.ci)**, since `pixi` is not
+    pre-installed in that environment.
+
+    Instead, run your hooks directly in GitHub Actions using:
+
+    ```shell
+    pixi run pre-commit run --all-files --show-diff-on-failure
+    ```
+
+
+
+## prek
+
+[prek](https://github.com/j178/prek) is a faster, Rust-based, drop-in replacement for `pre-commit`.
+It uses the **exact same** `.pre-commit-config.yaml` configuration format, so no changes to your
+existing hook definitions are needed.
+
+To use `prek` with `pixi`, add it to your project:
+
+```shell
+pixi add prek
+```
+
+Install the git hooks:
+
+```shell
+pixi run prek install
+```
+
+From this point on, `prek` will run your hooks on every commit using your existing
+`.pre-commit-config.yaml` — no additional configuration is required.
+
+!!! tip
+    If you are already using `pre-commit`, switching to `prek` is as simple as replacing
+    `pre-commit` with `prek` in your commands. Your existing `.pre-commit-config.yaml`
+    works without any modifications.

mkdocs.yml

@@ -188,6 +188,7 @@ nav:
           - Pixi Pack: deployment/pixi_pack.md
           - Pixi Skills: integration/extensions/pixi_skills.md
       - Third Party:
+          - Git Hooks: integration/third_party/git_hooks.md
           - Conda Deny: integration/third_party/conda_deny.md
           - Direnv: integration/third_party/direnv.md
           - Starship: integration/third_party/starship.md