# Utility variables.
empty :=
space := $(empty) $(empty)
comma := ,

CPPLINT = $(top_srcdir)/utils/cpplint/cpplint.py

CPPLINT_DISABLE_FILTERS = \
  build/c++11 \
  build/include_order \
  build/include_what_you_use \
  legal/copyright \
  readability/braces \
  readability/fn_size \
  readability/streams \
  readability/todo \
  runtime/int \
  runtime/references

CPPLINT_FLAGS = \
  --linelength=80 \
  --filter=-$(subst $(space),$(comma)-,$(strip $(CPPLINT_DISABLE_FILTERS)))

CPPLINT_SRCS_DIRS = \
  $(top_srcdir)/include \
  $(top_srcdir)/lib

# List of files that doesn't want to run cpplint
CPPLINT_SRC_FILES_FILTER =

CPPLINT_SRC_FILES = $(shell find $(CPPLINT_SRCS_DIRS) \
                       -name \*.h -o \
                       -name \*.cpp -o \
                       -name \*.tcc \
                       -name \*.inc \
                       -type f)

# $(1): file
define declare-cpplint-target
cpplint_file = $(1)

cpplint_target = $(subst /,__,$(cpplint_file))

cpplint_root = \
  $(subst $(top_srcdir)/,,$(strip $(foreach subdir,$(CPPLINT_SRCS_DIRS), \
                                    $(if $(findstring $(subdir)/,$(cpplint_file)), \
                                      $(patsubst $(subdir)/%,$(subdir),$(cpplint_file)),))))

.PHONY: $(cpplint_target)
$(cpplint_target): $(cpplint_file) $(cpplint_root) $(CPPLINT)
	$(hide) $(CPPLINT) $(CPPLINT_FLAGS) --root=$(cpplint_root) $(cpplint_file) && \
    printf "\E[1;37;42mPASSED\E[0m " && echo $(cpplint_file) || \
    printf "\E[1;37;41mFAILED\E[0m " && echo $(cpplint_file)
endef

$(foreach file,$(CPPLINT_SRC_FILES),$(eval $(call declare-cpplint-target,$(file))))

CPPLINT_TARGET = $(foreach file,$(CPPLINT_SRC_FILES),$(subst /,__,$(file)))

.PHONY: cpplint
cpplint: $(CPPLINT_TARGET)