Add clang-format call to pretty Makefile target

.clang-format

@@ -129,10 +129,5 @@ PenaltyBreakString: 1000
 PenaltyExcessCharacter: 1000000
 PenaltyReturnTypeOnItsOwnLine: 60
 
-# Misc
-RawStringFormats:
-  - Delimiter:       pb
-    Language:        TextProto
-    BasedOnStyle:    google
 ...
 

.github/CONTRIBUTING.md

@@ -50,7 +50,7 @@ To make changes, you need to edit the following files:
 ## Note
 
 - If you open a pull request, the code will be automatically tested with [Valgrind](http://valgrind.org)'s Memcheck tool to detect memory leaks. Please be aware that the execution with Valgrind _may_ in rare cases yield different behavior than running the code directly. This can result in failing unit tests which run successfully without Valgrind.
-- There is a Makefile target `make pretty` which runs [Artistic Style](http://astyle.sourceforge.net) to fix indentation. If possible, run it before opening the pull request. Otherwise, we shall run it afterward.
+- There is a Makefile target `make pretty` which runs [Artistic Style](http://astyle.sourceforge.net) to fix indentation and [clang-format](https://clang.llvm.org/docs/ClangFormat.html). If possible, run it before opening the pull request. Otherwise, we shall run it afterward.
 
 ## Please don't
 

Makefile

@@ -54,7 +54,7 @@ all:
 	@echo "json_unit - create single-file test executable"
 	@echo "pedantic_clang - run Clang with maximal warning flags"
 	@echo "pedantic_gcc - run GCC with maximal warning flags"
-	@echo "pretty - beautify code with Artistic Style"
+	@echo "pretty - beautify code with Artistic Style and clang-format"
 	@echo "run_benchmarks - build and run benchmarks"
 
 ##########################################################################
@@ -276,9 +276,12 @@ clang_analyze:
 ##########################################################################
 # maintainer targets
 ##########################################################################
+ASTYLE := $(shell command -v astyle 2> /dev/null)
+CLANG_FORMAT := $(shell command -v clang-format 2> /dev/null)
 
 # pretty printer
 pretty:
+ifdef ASTYLE
 	astyle --style=allman --indent=spaces=4 --indent-modifiers \
 	   --indent-switches --indent-preproc-block --indent-preproc-define \
 	   --indent-col1-comments --pad-oper --pad-header --align-pointer=type \
@@ -286,6 +289,11 @@ pretty:
 	   --lineend=linux --preserve-date --suffix=none --formatted \
 	   $(SRCS) $(AMALGAMATED_FILE) test/src/*.cpp \
 	   benchmarks/src/benchmarks.cpp doc/examples/*.cpp
+endif
+
+ifdef CLANG_FORMAT
+	clang-format -i $(SRCS)
+endif
 
 # create single header file
 amalgamate: $(AMALGAMATED_FILE)