Add pre-commit hooks and run them from format.sh

.github/workflows/pre-commit.yml

@@ -0,0 +1,41 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+#
+# SPDX-License-Identifier: MIT
+
+name: pre-commit
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - name: Install pre-commit
+        run: pip install pre-commit
+      - name: Run pre-commit on changed files
+        run: |
+          set -e
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            base_sha="${{ github.event.pull_request.base.sha }}"
+          else
+            base_sha="${{ github.event.before }}"
+          fi
+          echo "Base SHA: ${base_sha}"
+          echo "Head SHA: ${{ github.sha }}"
+          changed=$(git diff --name-only "${base_sha}" "${{ github.sha }}" || true)
+          if [ -n "${changed}" ]; then
+            echo "Checking changed files:"
+            echo "${changed}"
+            pre-commit run --files ${changed} --show-diff-on-failure
+          else
+            echo "No changed files to check."
+          fi

.pre-commit-config.yaml

@@ -0,0 +1,45 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+#
+# SPDX-License-Identifier: MIT
+
+# Pre-commit hooks for TileGym.
+#
+# Run locally with `bash format.sh` (which installs and runs these hooks), or
+# directly with `pre-commit run --all-files`. CI runs these hooks on the files
+# changed by each pull request (see .github/workflows/pre-commit.yml).
+#
+# Skill content under `skills/` is intentionally excluded: those files are
+# signed artifacts (each skill ships a `skill.oms.sig`), so reformatting them
+# would invalidate the signature. Skills are validated and signed by the
+# NVSkills pipeline, not hand-formatted.
+
+repos:
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v3.3.0
+  hooks:
+  - id: trailing-whitespace
+    exclude: '^skills/|\.patch$'
+  - id: end-of-file-fixer
+    exclude: '^skills/|\.patch$'
+  - id: check-yaml
+    exclude: '^skills/'
+  - id: check-added-large-files
+    exclude: '^skills/|\.patch$'
+  - id: check-json
+    exclude: '^skills/'
+  - id: pretty-format-json
+    args: ['--autofix', '--indent=2']
+    exclude: '^skills/'
+
+- repo: https://github.com/astral-sh/ruff-pre-commit
+  rev: v0.14.9
+  hooks:
+    - id: ruff-check
+      name: ruff-lint
+      args: [--fix]
+      types_or: [python]
+      exclude: '^skills/|\.patch$'
+    - id: ruff-format
+      name: ruff-format
+      types_or: [python]
+      exclude: '^skills/|\.patch$'

format.sh

@@ -3,13 +3,32 @@
 #
 # SPDX-License-Identifier: MIT
 
-# Quick formatting script for TileGym development
-# Formats code and sorts imports using ruff
+# Quick formatting script for TileGym development.
+# Runs the pre-commit hooks, adds SPDX headers, and formats/sorts with ruff.
 
 set -e
 
 RUFF_VERSION="0.14.9"
 
+echo "🔍 Checking pre-commit installation..."
+if ! command -v pre-commit &> /dev/null; then
+    echo "📦 Installing pre-commit..."
+    pip install pre-commit
+fi
+
+echo ""
+echo "Installing pre-commit hooks..."
+pre-commit install-hooks
+
+echo ""
+echo "Running all pre-commit hooks..."
+# Run pre-commit on all files; continue even if some hooks fail
+# (several hooks are auto-fixers and will modify files).
+set +e
+pre-commit run --all-files
+set -e
+
+echo ""
 echo "🔍 Checking ruff installation..."
 if ! python3 -m ruff --version 2>/dev/null | grep -q "$RUFF_VERSION"; then
     echo "📦 Installing ruff $RUFF_VERSION..."
@@ -29,4 +48,4 @@ echo "✨ Formatting code..."
 python3 -m ruff format .
 
 echo ""
-echo "✅ Done! SPDX headers added, code is formatted, and imports are sorted."
+echo "✅ Done! Pre-commit hooks ran, SPDX headers added, code formatted, imports sorted."