Add pre-commit hook for clang-format

Author: franzpoeschel

.github/workflows/clang-format/clang-format.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+if (( $# > 0 )); then
+    # received arguments, format those files
+    clang-format-12 -i "$@"
+else
+    # received no arguments, find files on our own
+    find include/ src/ test/ examples/ \
+            -regextype egrep \
+            -type f -regex '.*\.(hpp|cpp|hpp\.in)$' \
+        | xargs clang-format-12 -i
+fi

.pre-commit-config.yaml

@@ -62,6 +62,15 @@ repos:
 
 # C++ formatting
 # clang-format
+- repo: local
+  hooks:
+  - id: clang-format
+    name: clang-format
+    description: Clang-format our code base
+    files: '^(include|src|test|examples)/.*\.(hpp|cpp|hpp\.in)$'
+    language: conda
+    entry: bash .github/workflows/clang-format/clang-format.sh
+    additional_dependencies: [-c, conda-forge, clang-format-12]
 
 # Autoremoves unused Python imports
 - repo: https://github.com/hadialqattan/pycln

environment.yml

@@ -0,0 +1,7 @@
+# I am a conda environment, used for our pre-commit hooks
+name: openPMD-api-dev
+channels:
+  - conda-forge
+dependencies:
+  - clang-format-12=12.0.1
+  - bash=5