Install pre-commit with setup, add GitHub action for pre-commit

.github/workflows/regress.yml

@@ -5,6 +5,12 @@ on:
     - main
   workflow_dispatch:
 jobs:
+  regress-pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v3
+      - uses: pre-commit/[email protected]
   regress-smoke:
     runs-on: ubuntu-latest
     steps:

bin/python

@@ -1,6 +1,8 @@
 #!/bin/bash
 
 ROOT=$(dirname $(realpath $BASH_SOURCE[0]))
-source $ROOT/setup
+if [ ! -v NO_SOURCE ]; then
+  source $ROOT/setup
+fi
 
 $PYTHON "$@"

bin/setup

@@ -91,7 +91,7 @@ if [ -v DEVCONTAINER_ENV ]; then
   NPM="npm"
   NPX="npx"
   NODE="node"
-  PYTHON="python3"
+  PYTHON="${ROOT}/.home/.venv/bin/python3"
   PIP="${ROOT}/.home/.venv/bin/pip"
   BASH="bash"
 else
@@ -101,7 +101,33 @@ else
   NPM="singularity run ${HOME_OPT} ${CONTAINER_PATH} npm"
   NPX="singularity run ${HOME_OPT} ${CONTAINER_PATH} npx"
   NODE="singularity run ${HOME_OPT} ${CONTAINER_PATH} node"
-  PYTHON="singularity run ${HOME_OPT} ${CONTAINER_PATH} python3"
+  PYTHON="singularity run ${HOME_OPT} ${CONTAINER_PATH} ${ROOT}/.home/.venv/bin/python3"
   PIP="singularity run ${HOME_OPT} ${CONTAINER_PATH} ${ROOT}/.home/.venv/bin/pip"
   BASH="singularity run ${HOME_OPT} ${CONTAINER_PATH} bash"
 fi
+
+if [ ! -f $ROOT/.git/hooks/pre-commit ]; then
+  cat << HOOK > $ROOT/.git/hooks/pre-commit
+#!/usr/bin/env bash
+# File generated by pre-commit: https://pre-commit.com
+# ID: 138fd403232d2ddd5efb44317e38bf03
+
+# start templated
+INSTALL_PYTHON=$ROOT/bin/python
+ARGS=(hook-impl --config=.pre-commit-config.yaml --hook-type=pre-commit)
+# end templated
+
+HERE="$(cd "$(dirname "\$0")" && pwd)"
+ARGS+=(--hook-dir "\$HERE" -- "\$@")
+
+if [ -x "\$INSTALL_PYTHON" ]; then
+    exec "\$INSTALL_PYTHON" -mpre_commit "\${ARGS[@]}"
+elif command -v pre-commit > /dev/null; then
+    exec pre-commit "\${ARGS[@]}"
+else
+    echo '`pre-commit` not found.  Did you forget to activate your virtualenv?' 1>&2
+    exit 1
+fi
+HOOK
+  chmod +x $ROOT/.git/hooks/pre-commit
+fi