* Replace pre-commit hook with CMake-generated clang-format check
Replace the old pre-commit hook that shelled out to PowerShell and
never blocked commits (-NoFail) with a CMake-generated hook that
calls clang-format directly on staged C/C++ files.
- Add tools/hooks/pre-commit.in as a CMake template
- CMake resolves the clang-format path at configure time via
LLVM_INSTALL_DIR, matching the existing FormatSource.ps1.in pattern
- Hook blocks commits on formatting errors, skips gracefully if
clang-format is not available (cmake not yet run)
- ~5x faster than the old PowerShell approach (~0.5s vs ~2.6s)
* Make pre-commit hook behavior configurable via WSL_PRE_COMMIT_MODE
Add WSL_PRE_COMMIT_MODE CMake cache variable with three modes:
- warn (default): report formatting issues without blocking commit
- error: block commit when formatting issues are found
- fix: auto-format files and re-stage them
Also addresses PR feedback:
- Generate hook into build tree, copy to source tree for out-of-source builds
- Use repo-local tools/clang-format.exe instead of LLVM_INSTALL_DIR path
- Use @ONLY in configure_file to avoid shell variable substitution issues
- Document modes in dev-loop.md and UserConfig.cmake.sample
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---------
Co-authored-by: Ben Hillis <benhill@ntdev.microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
