From d832267e2367e6377a08501c6a590a63460f6e1d Mon Sep 17 00:00:00 2001
From: Luca Boccassi <luca.boccassi@gmail.com>
Date: Sat, 10 Feb 2018 17:34:01 +0000
Subject: [PATCH] Problem: make format-check not implemented with autotools

Solution: port implementation from zproject
---
 Makefile.am  | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 configure.ac | 13 +++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index 5b3d9496..3c1ce183 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -882,6 +882,57 @@ MAINTAINERCLEANFILES = \
 	$(srcdir)/configure \
 	`find "$(srcdir)" -type f -name Makefile.in -print`
 
+if WITH_CLANG_FORMAT
+ALL_SOURCE_FILES = $(wildcard \
+	$(top_srcdir)/src/*.c \
+	$(top_srcdir)/src/*.cc \
+	$(top_srcdir)/src/*.cpp \
+	$(top_srcdir)/src/*.h \
+	$(top_srcdir)/src/*.hpp \
+	$(top_srcdir)/tests/*.c \
+	$(top_srcdir)/tests/*.cc \
+	$(top_srcdir)/tests/*.cpp \
+	$(top_srcdir)/tests/*.h \
+	$(top_srcdir)/tests/*.hpp \
+	$(top_srcdir)/perf/*.c \
+	$(top_srcdir)/perf/*.cc \
+	$(top_srcdir)/perf/*.cpp \
+	$(top_srcdir)/perf/*.h \
+	$(top_srcdir)/perf/*.hpp \
+	$(top_srcdir)/tools/*.c \
+	$(top_srcdir)/tools/*.cc \
+	$(top_srcdir)/tools/*.cpp \
+	$(top_srcdir)/tools/*.h \
+	$(top_srcdir)/tools/*.hpp \
+	$(top_srcdir)/include/*.h \
+ )
+
+# Check if any sources need to be fixed, report the filenames and an error code
+clang-format-check: $(ALL_SOURCE_FILES)
+	@FAILED=0 ; IFS=";" ; IDS="`printf '\n\b'`" ; export IFS IDS; \
+	 for FILE in $(ALL_SOURCE_FILES) ; do \
+		test -s $$FILE || continue ; \
+		$(CLANG_FORMAT) -style=file -output-replacements-xml "$$FILE" | grep "<replacement " >/dev/null && \
+		{ echo "$$FILE is not correctly formatted" >&2 ; FAILED=1; } ; \
+	 done; \
+	 if test "$$FAILED" != 0 ; then \
+		exit 1 ; \
+	 fi
+
+# Change source formatting
+clang-format: $(ALL_SOURCE_FILES)
+	$(CLANG_FORMAT) -style=file -i $(ALL_SOURCE_FILES)
+
+# Change source formatting AND report the diff
+clang-format-diff: clang-format
+	git diff $(ALL_SOURCE_FILES)
+
+else
+clang-format clang-format-check clang-format-diff:
+	@echo "Install the clang-format program, reconfigure and re-run this request"
+	@exit 1
+endif
+
 @CODE_COVERAGE_RULES@
 
 dist-hook:
diff --git a/configure.ac b/configure.ac
index 12093b91..dd614b5e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -800,6 +800,19 @@ if test "x$enable_libunwind" != "xno"; then
         ])
 fi
 
+# See if clang-format is in PATH; the result unblocks the relevant recipes
+WITH_CLANG_FORMAT=""
+AS_IF([test x"$CLANG_FORMAT" = x],
+    [AC_PATH_PROG([CLANG_FORMAT], [clang-format], [])],
+    [AC_CHECK_PROG([WITH_CLANG_FORMAT], [$CLANG_FORMAT], [true], [fail])])
+AS_IF([test x"$CLANG_FORMAT" != x && test x"$WITH_CLANG_FORMAT" = x],
+    [AS_IF([test -x "$CLANG_FORMAT"],
+        [WITH_CLANG_FORMAT=true],
+        [AC_CHECK_PROG([WITH_CLANG_FORMAT], [$CLANG_FORMAT], [true], [false])])])
+AS_IF([test "$WITH_CLANG_FORMAT" = fail],
+    [AC_MSG_ERROR([Caller explicitly referenced CLANG_FORMAT=$CLANG_FORMAT which was not found])])
+AM_CONDITIONAL([WITH_CLANG_FORMAT], [$WITH_CLANG_FORMAT])
+
 # Subst LIBZMQ_EXTRA_CFLAGS & CXXFLAGS & LDFLAGS
 AC_SUBST(LIBZMQ_EXTRA_CFLAGS)
 AC_SUBST(LIBZMQ_EXTRA_CXXFLAGS)