Clang format

.gitlab-ci.yml

@@ -3,6 +3,8 @@ test:
   script:
     - mkdir build
     - cd build
-    - cmake -DBUILD_FOR_GPU=ON -DCMAKE_PREFIX_PATH=/opt/magma ..
+    - cmake -DBUILD_FOR_GPU=ON -DPLA_WITH_CLANG_FORMAT=ON -DCMAKE_PREFIX_PATH=/opt/magma ..
     - make
     - ctest
+    - make format
+    - git diff --exit-code

CMakeLists.txt

@@ -46,6 +46,20 @@ set(Boost_COMPONENTS
   )
 find_package(Boost 1.65 REQUIRED COMPONENTS ${Boost_COMPONENTS})
 
+# clang-format (optional)
+set(PLA_WITH_CLANG_FORMAT FALSE CACHE BOOL "Indent code with clang-format")
+if(${PLA_WITH_CLANG_FORMAT})
+  find_package(CLANG_FORMAT)
+  if(${CLANG_FORMAT_FOUND})
+    message(STATUS "Indent with clang-format")
+    file(GLOB_RECURSE FORMAT_SOURCES src/*.cc src/*.h src/*.cpp src/*.hpp
+      tests/*.cc tests/*.h tests/*.cpp tests/*.hpp)
+    add_custom_target(format
+      COMMAND ${CLANG_FORMAT_EXECUTABLE} -i -style=file ${FORMAT_SOURCES}
+      DEPENDS ${FORMAT_SOURCES})
+  endif()
+endif()
+
 enable_testing()
 
 add_subdirectory(src)

ci/Dockerfile

@@ -8,6 +8,7 @@ RUN apt-get update && apt-get upgrade -y && apt-get install -y \
       gcc \
       gfortran \
       build-essential \
+      clang-format \
       wget \
       curl \
       bison \

cmake/FindCLANG_FORMAT.cmake

@@ -0,0 +1,31 @@
+# Find clang-format
+#
+# CLANG_FORMAT_EXECUTABLE   - Path to clang-format executable
+# CLANG_FORMAT_FOUND        - True if clang-format executable was found
+# CLANG_FORMAT_VERSION      - The version of clang-format found
+
+find_program(CLANG_FORMAT_EXECUTABLE
+  NAMES clang-format clang-format-6.0
+  DOC "clang-format executable")
+mark_as_advanced(CLANG_FORMAT_EXECUTABLE)
+
+# Extract version
+if (CLANG_FORMAT_EXECUTABLE)
+  execute_process(COMMAND ${CLANG_FORMAT_EXECUTABLE} -version
+    OUTPUT_VARIABLE clang_format_version
+    ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+  if (clang_format_version MATCHES "^clang-format version .*")
+    # clang_format_version sample: "clang-format version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)"
+    string(REGEX REPLACE "clang-format version ([.0-9]+).*" "\\1" 
+      CLANG_FORMAT_VERSION "${clang_format_version}")
+  endif()
+  if (NOT CLANG_FORMAT_VERSION STREQUAL "6.0.0" AND
+      NOT CLANG_FORMAT_VERSION STREQUAL "6.0.1")
+    message(SEND_ERROR "Wrong clang-format version. Please use clang-format 6.0.")
+  endif()
+endif()
+
+include(FindPackageHandleStandardArgs)
+# handle the QUIETLY and REQUIRED arguments and set CLANG_FORMAT_FOUND to TRUE
+# if all listed variables are TRUE
+find_package_handle_standard_args(CLANG_FORMAT REQUIRED_VARS CLANG_FORMAT_EXECUTABLE VERSION_VAR CLANG_FORMAT_VERSION)