THIS_DIR = $(shell pwd)
filter-false = $(strip $(filter-out 0 off OFF false FALSE,$1))
filter-true = $(strip $(filter-out 1 on ON true TRUE,$1))

# See contrib/local.mk.example
-include local.mk

CMAKE_PRG ?= $(shell (command -v cmake3 || echo cmake))
CMAKE_BUILD_TYPE ?= Debug
CMAKE_FLAGS := -DCMAKE_BUILD_TYPE=$(CMAKE_BUILD_TYPE)
# Extra CMake flags which extend the default set
CMAKE_EXTRA_FLAGS ?=

# CMAKE_INSTALL_PREFIX
#   - May be passed directly or as part of CMAKE_EXTRA_FLAGS.
#   - `checkprefix` target checks that it matches the CMake-cached value. #9615
CMAKE_INSTALL_PREFIX ?= $(shell echo $(CMAKE_EXTRA_FLAGS) | 2>/dev/null \
    grep -o 'CMAKE_INSTALL_PREFIX=[^ ]\+' | cut -d '=' -f2)
ifneq (,$(CMAKE_INSTALL_PREFIX))
  CMAKE_FLAGS += -DCMAKE_INSTALL_PREFIX=$(CMAKE_INSTALL_PREFIX)
endif

BUILD_TYPE ?= $(shell (type ninja > /dev/null 2>&1 && echo "Ninja") || \
    echo "Unix Makefiles")
DEPS_BUILD_DIR ?= .deps
ifneq (1,$(words [$(DEPS_BUILD_DIR)]))
  $(error DEPS_BUILD_DIR must not contain whitespace)
endif

ifeq (,$(BUILD_TOOL))
  ifeq (Ninja,$(BUILD_TYPE))
    ifneq ($(shell $(CMAKE_PRG) --help 2>/dev/null | grep Ninja),)
      BUILD_TOOL := ninja
    else
      # User's version of CMake doesn't support Ninja
      BUILD_TOOL = $(MAKE)
      BUILD_TYPE := Unix Makefiles
    endif
  else
    BUILD_TOOL = $(MAKE)
  endif
endif

BUILD_CMD = $(BUILD_TOOL)

ifneq ($(VERBOSE),)
  # Only need to handle Ninja here.  Make will inherit the VERBOSE variable.
  ifeq ($(BUILD_TYPE),Ninja)
    BUILD_CMD += -v
  endif
endif

DEPS_CMAKE_FLAGS ?=
# Back-compat: USE_BUNDLED_DEPS was the old name.
USE_BUNDLED ?= $(USE_BUNDLED_DEPS)

ifneq (,$(USE_BUNDLED))
  BUNDLED_CMAKE_FLAG := -DUSE_BUNDLED=$(USE_BUNDLED)
endif

ifneq (,$(findstring functionaltest-lua,$(MAKECMDGOALS)))
  BUNDLED_LUA_CMAKE_FLAG := -DUSE_BUNDLED_LUA=ON
  $(shell [ -x $(DEPS_BUILD_DIR)/usr/bin/lua ] || rm build/.ran-*)
endif

# For use where we want to make sure only a single job is run.  This does issue 
# a warning, but we need to keep SCRIPTS argument.
SINGLE_MAKE = export MAKEFLAGS= ; $(MAKE)

all: nvim

nvim: checkprefix build/.ran-cmake deps
	+$(BUILD_CMD) -C build

libnvim: build/.ran-cmake deps
	+$(BUILD_CMD) -C build libnvim

cmake:
	touch CMakeLists.txt
	$(MAKE) build/.ran-cmake

build/.ran-cmake: | deps
	cd build && $(CMAKE_PRG) -G '$(BUILD_TYPE)' $(CMAKE_FLAGS) $(CMAKE_EXTRA_FLAGS) $(THIS_DIR)
	touch $@

deps: | build/.ran-third-party-cmake
ifeq ($(call filter-true,$(USE_BUNDLED)),)
	+$(BUILD_CMD) -C $(DEPS_BUILD_DIR)
endif

build/.ran-third-party-cmake::
	mkdir -p build
	touch $@

ifeq ($(call filter-true,$(USE_BUNDLED)),)
$(DEPS_BUILD_DIR):
	mkdir -p "$@"
build/.ran-third-party-cmake:: $(DEPS_BUILD_DIR)
	cd $(DEPS_BUILD_DIR) && \
		$(CMAKE_PRG) -G '$(BUILD_TYPE)' $(BUNDLED_CMAKE_FLAG) $(BUNDLED_LUA_CMAKE_FLAG) \
		$(DEPS_CMAKE_FLAGS) $(THIS_DIR)/third-party
endif

# TODO: cmake 3.2+ add_custom_target() has a USES_TERMINAL flag.
oldtest: | nvim helptags
	+$(SINGLE_MAKE) -C src/nvim/testdir clean
ifeq ($(strip $(TEST_FILE)),)
	+$(SINGLE_MAKE) -C src/nvim/testdir NVIM_PRG="$(realpath build/bin/nvim)" $(MAKEOVERRIDES)
else
	+$(SINGLE_MAKE) -C src/nvim/testdir NVIM_PRG="$(realpath build/bin/nvim)" NEW_TESTS=$(TEST_FILE) SCRIPTS= $(MAKEOVERRIDES)
endif

helptags: | nvim
	+$(BUILD_CMD) -C build runtime/doc/tags

# Builds help HTML _and_ checks for invalid help tags.
helphtml: | nvim helptags
	+$(BUILD_CMD) -C build doc_html

functionaltest: | nvim
	+$(BUILD_CMD) -C build functionaltest

functionaltest-lua: | nvim
	+$(BUILD_CMD) -C build functionaltest-lua

testlint: | build/.ran-cmake deps
	$(BUILD_CMD) -C build testlint

lualint: | build/.ran-cmake deps
	$(BUILD_CMD) -C build lualint

unittest: | nvim
	+$(BUILD_CMD) -C build unittest

benchmark: | nvim
	+$(BUILD_CMD) -C build benchmark

test: functionaltest unittest

clean:
	+test -d build && $(BUILD_CMD) -C build clean || true
	$(MAKE) -C src/nvim/testdir clean
	$(MAKE) -C runtime/doc clean

distclean:
	rm -rf $(DEPS_BUILD_DIR) build
	$(MAKE) clean

install: | nvim
	+$(BUILD_CMD) -C build install

clint: build/.ran-cmake
	+$(BUILD_CMD) -C build clint

clint-full: build/.ran-cmake
	+$(BUILD_CMD) -C build clint-full

check-single-includes: build/.ran-cmake
	+$(BUILD_CMD) -C build check-single-includes

generated-sources: build/.ran-cmake
	+$(BUILD_CMD) -C build generated-sources

appimage:
	bash scripts/genappimage.sh

# Build an appimage with embedded update information.
#   appimage-nightly: for nightly builds
#   appimage-latest: for a release
appimage-%:
	bash scripts/genappimage.sh $*

lint: check-single-includes clint testlint lualint

checkprefix:
	@cached_prefix=$$("$(CMAKE_PRG)" -L -N build | 2>/dev/null grep 'CMAKE_INSTALL_PREFIX' | cut -d '=' -f2); \
	if [ -n "$(CMAKE_INSTALL_PREFIX)" ] && [ -n "$$cached_prefix" ] && ! [ "$(CMAKE_INSTALL_PREFIX)" = "$$cached_prefix" ]; then \
		printf "\nerror: CMAKE_INSTALL_PREFIX '$(CMAKE_INSTALL_PREFIX)' does not match cached value '%s'\n" "$$cached_prefix"; \
		printf "       Run this command, then try again:\n"; \
		printf "         cmake build -DCMAKE_INSTALL_PREFIX=$(CMAKE_INSTALL_PREFIX)\n"; \
		exit 1; \
	fi;

.PHONY: test testlint lualint functionaltest unittest lint clint clean distclean nvim libnvim cmake deps install appimage checkprefix