Make pre-commit hook a local hook

.pre-commit-config.yaml

@@ -1,7 +1,11 @@
 # See https://pre-commit.com for more information
 # See https://pre-commit.com/hooks.html for more hooks
 repos:
--   repo: https://github.com/franzpoeschel/openPMD-api-pre-commit-hooks
-    rev: aa38b2ad4fae42db05c19de211f43df6a7981bc5
+-   repo: local
     hooks:
     -   id: clang-format
+        name: clang-format
+        description: Clang-format our code base
+        language: conda
+        entry: bash ./clang-format.sh --install-clang-format
+        additional_dependencies: [-c, conda-forge, clang-format-12]

clang-format.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+if [[ $1 = "--install-clang-format" ]]; then
+    echo -e "\n\n\n–––––––\nENV:\n––––––––\n\n\n$(env)\n\n\n–––––\nBINS:\n–––––\n\n\n$(ls $CONDA_PREFIX/..)\n\n\n"
+    ls /usr/bin
+fi
+
+find include/ src/ test/ examples/ \
+        -regextype egrep \
+        -type f -regex '.*\.(hpp|cpp|hpp\.in)$' \
+    | xargs /usr/bin/clang-format-12 -i

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