pw_presubmit: Add cpp formatting support for Bazel

Adds CPP formatting support for the Bazel-focused pigweed_format.py.

Bug: b/326309165
Change-Id: I68b4642332144f3712c82304aecfa3914dde5f85
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/266992
Docs-Not-Needed: Armando Montanez <amontanez@google.com>
Reviewed-by: Ted Pudlik <tpudlik@google.com>
Pigweed-Auto-Submit: Armando Montanez <amontanez@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>

pw_presubmit/py/BUILD.bazel

@@ -12,6 +12,7 @@
 # License for the specific language governing permissions and limitations under
 # the License.
 
+load("@bazel_skylib//rules:copy_file.bzl", "copy_file")
 load("@rules_python//python:defs.bzl", "py_library")
 load("@rules_python//python/entry_points:py_console_script_binary.bzl", "py_console_script_binary")
 load("//pw_build:python.bzl", "pw_py_binary", "pw_py_test")
@@ -109,12 +110,24 @@ py_console_script_binary(
     visibility = ["//visibility:private"],
 )
 
+copy_file(
+    name = "clang-format",
+    src = select({
+        "@platforms//os:macos": "@llvm_toolchain_macos//:bin/clang-format",
+        "//conditions:default": "@llvm_toolchain//:bin/clang-format",
+    }),
+    out = "clang-format",
+    allow_symlink = True,
+    is_executable = True,
+)
+
 pw_py_binary(
     name = "format",
     srcs = ["pw_presubmit/format/pigweed_format.py"],
     data = [
         "//:.black.toml",
         "//pw_presubmit/py:black",
+        "//pw_presubmit/py:clang-format",
     ],
     main = "pw_presubmit/format/pigweed_format.py",
     deps = [

pw_presubmit/py/pw_presubmit/format/pigweed_format.py

@@ -21,6 +21,7 @@
 from pw_cli.tool_runner import ToolRunner, BasicSubprocessRunner
 from pw_presubmit.format.private.cli import FormattingSuite
 from pw_presubmit.format.python import BlackFormatter
+from pw_presubmit.format.cpp import ClangFormatFormatter
 
 try:
     from python.runfiles import runfiles  # type: ignore
@@ -84,6 +85,11 @@ def _pigweed_formatting_suite() -> FormattingSuite:
         default_runner.add_tool(  # type: ignore[attr-defined]
             'black', 'pigweed/pw_presubmit/py/black', r.CurrentRepository()
         )
+        default_runner.add_tool(  # type: ignore[attr-defined]
+            'clang-format',
+            'pigweed/pw_presubmit/py/clang-format',
+            r.CurrentRepository(),
+        )
 
     # This is deliberately not public since there's some work to do to make
     # things more extensible/maintainable before downstream projects try to
@@ -93,6 +99,9 @@ def _pigweed_formatting_suite() -> FormattingSuite:
             config_file=tool_runfiles['.black.toml'],
             tool_runner=default_runner,
         ),
+        ClangFormatFormatter(
+            tool_runner=default_runner,
+        ),
     ]
     return FormattingSuite(pigweed_formatters)