Update pre-commit (#372)

.pre-commit-config.yaml

@@ -37,7 +37,7 @@ repos:
     hooks:
       - id: mypy
         name: mypy
-        entry: ./script/run-pre-commit.sh mypy
+        entry: script/run-in-env.sh mypy
         language: script
         types: [python]
         require_serial: true

script/run-in-env.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env sh
+# From https://github.com/home-assistant/core/blob/dev/script/run-in-env.sh
+set -eu
+
+# Used in venv activate script.
+# Would be an error if undefined.
+OSTYPE="${OSTYPE-}"
+
+# Activate pyenv and virtualenv if present, then run the specified command
+
+# pyenv, pyenv-virtualenv
+if [ -s .python-version ]; then
+    PYENV_VERSION=$(head -n 1 .python-version)
+    export PYENV_VERSION
+fi
+
+# other common virtualenvs
+my_path=$(git rev-parse --show-toplevel)
+
+for venv in venv .venv .; do
+  if [ -f "${my_path}/${venv}/bin/activate" ]; then
+    . "${my_path}/${venv}/bin/activate"
+    break
+  fi
+done
+
+exec "$@"