Specify a code style via clang-format --style=webkit

clang-format --style=webkit is closest to the current style. Most
notably, `calling_a_function ( "has more spaces now" )` than
`calling_a_function("would have in this change")`

Let me know what you think. The files were changed with `make lint`.

.github/workflows/ci.yaml

@@ -9,6 +9,14 @@ concurrency:
   cancel-in-progress: true
 jobs:
 
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: sudo apt-get install -y make clang-format
+      - run: make lint
+      - run: git diff --exit-code
+
   build-with-gcc:
     strategy:
       matrix:

Makefile

@@ -100,6 +100,10 @@ $(ODIR)/%.o: %.cpp Makefile
 	@$(MKDIR) $(dir $@)
 	$(VERBOSE_PREFIX)$(CXX) -MMD -MP -std=c++11 $(CFLAGS) $(CXXFLAGS) -o $@ -c $<
 
+.PHONY: lint
+lint:
+	clang-format -i --style=webkit **/*.h **/*.c
+
 .PHONY: clean
 
 clean: