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# If no .config on main folder i have to create one
NONE := $(shell touch .config)
include .config

# Verbose build output:
#   V=0: minimal output
#   V=1: verbose output from latex tools (like latexmk)
#   V=2: verbose output from all commands and make as well
ifeq ("$(origin V)", "command line")
  BUILD_VERBOSE = $(V)
endif
ifndef BUILD_VERBOSE
BUILD_VERBOSE = 0
endif
ifeq ($(BUILD_VERBOSE),2)
Q =
else
Q = @
endif

TOP_DIR         := $(CURDIR)
PATHS           :=

CONFIG_PATH     := $(CURDIR)
CONFIG_FILE     := .config
CONFIG          := $(CONFIG_PATH)/$(CONFIG_FILE)
CONFIG_OLD      := $(CONFIG).old
DEPLOY_FOLDER	:= deploy
DEPLOY		:= $(CONFIG_PATH)/$(DEPLOY_FOLDER)
HANDOUT_FOLDER	:= handouts
HANDOUT		:=$(DEPLOY)/$(HANDOUT_FOLDER)
DEFCONF_FOLDER	:= $(CURDIR)/configs

BUILD_COMMAND   := latexmk
BUILD_ARGS	:= -f -halt-on-error -xelatex -bibtex -pdf
ifeq ($(BUILD_VERBOSE),0)
BUILD_ARGS	+= --interaction=batchmode -silent
else
BUILD_ARGS	+= --interaction=errorstopmode -verbose
endif
BUILD           := $(BUILD_COMMAND) $(BUILD_ARGS)

KCONFIG_PATH	:= ./kconfig-frontends/frontends
KCONFIG 	:= $(KCONFIG_PATH)/conf/conf
KMCONFIG	:= $(KCONFIG_PATH)/mconf/mconf

MODMK = $(MAKE) -f $(TOP_DIR)/modules.mk
ifneq ($(BUILD_VERBOSE),2)
MODMK += --quiet
endif

# Folder that should not include to build paths
EXCLUDE_PATH := \
	grep -v ./kconfig-frontends |  \
	grep -v ./.git | \
	grep -v ./kernel-devel/module-basics/vain | \
	grep -v ./kernel-devel/module-basics/vain_pci | \
	grep -v ./kernel-devel/module-basics/vain_plat | \
	grep -v ./examples

# Search for all folders with Makfile
MAKE_FILES = $(shell find . -mindepth 2 -name Makefile | $(EXCLUDE_PATH))
PATHS = $(dir $(MAKE_FILES))

export

build: $(BUILD_REQ)
	$(Q)mkdir -p $(HANDOUT)
	$(Q)$(foreach dir,$(PATHS),$(MODMK) -C $(dir) $@;)

$(KMCONFIG):
	cd kconfig-frontends/ && ./configure && make
	
$(KCONFIG):
	cd kconfig-frontends/ && ./configure && make

menuconfig: $(KMCONFIG)
	$(Q)$(KMCONFIG) Kconfig

config: $(KCONFIG)
	$(Q)$(KCONFIG) --oldaskconfig Kconfig

oldconfig: $(KCONFIG)
	$(Q)cp $@ $(CONFIG_FILE)
	$(Q)$(KCONFIG) --oldconfig Kconfig

clean:
	$(Q)$(foreach dir,$(PATHS),$(MODMK) -C $(dir) $@_texfiles;)
	$(Q)rm -rf $(DEPLOY_FOLDER)

mrproper: clean
	$(Q)echo [CLEAN] $@
	$(Q)rm -f $(CONFIG)
	$(Q)rm -f $(CONFIG_OLD)

distclean: mrproper
	$(Q)echo [CLEAN] $@
	$(Q)find -name "tmp*" -exec rm -f {} \;

%_defconfig: $(KCONFIG)
	$(Q)cp $(DEFCONF_FOLDER)/$@ $(CONFIG_FILE)
	$(Q)$(KCONFIG) --oldconfig Kconfig

.PHONY: config oldconfig menuconfig build clean mrproper distclean