RM=rm
MV=mv
MKDIR=mkdir
CP=cp
export BIN_FILES=magiclantern magiclantern.bin autoexec.bin autoexec

# redefine to 'date' if you want see you zone time in version timestamp
DATE=date -u

BINARIES_PATH=binaries
LUA_PATH=$(TOP_DIR)/lua
PWD_DIR=$(shell pwd)
SRC_DIR=$(TOP_DIR)/src
PLATFORM_PATH=$(TOP_DIR)/platform
BUILDER_DIR=$(TOP_DIR)/../dumper
DOC_DIR=$(TOP_DIR)/doc
FONT_DIR=$(TOP_DIR)/data/fonts
CROP_DIR=$(TOP_DIR)/data/cropmks
VRAM_DIR=$(TOP_DIR)/data/vram
SCRIPT_DIR=$(TOP_DIR)/scripts
MODULES_DIR=$(TOP_DIR)/modules
INSTALLER_DIR=$(TOP_DIR)/installer
BIN_FILES=magiclantern magiclantern.bin autoexec.bin autoexec
CF_CARD_ML_DIR = $(CF_CARD)/ML

BUILD_TOOLS_DIR=$(TOP_DIR)/build_tools
XOR_CHK=$(BUILD_TOOLS_DIR)/xor_chk

INSTALL_DIR ?= $(CF_CARD)
INSTALL_ML_DIR = $(INSTALL_DIR)/ML
INSTALL_FONTS_DIR= $(INSTALL_ML_DIR)/fonts
INSTALL_MODULES_DIR = $(INSTALL_ML_DIR)/modules
INSTALL_SETTINGS_DIR= $(INSTALL_ML_DIR)/settings
INSTALL_DATA_DIR= $(INSTALL_ML_DIR)/data
INSTALL_CROPMARKS_DIR= $(INSTALL_ML_DIR)/cropmks
INSTALL_SCRIPTS_DIR= $(INSTALL_ML_DIR)/scripts
INSTALL_DOC_DIR = $(INSTALL_ML_DIR)/doc
INSTALL_LOGS_DIR = $(INSTALL_ML_DIR)/logs
INSTALL_PREPARE ?= $(MOUNT_CARD)
INSTALL_FINISH ?= $(UMOUNT) $(CF_CARD)

# this one is called from both platform and modules
# copies all scripts, preserving directory structure
# (simpler way to do this?)
INSTALL_ALL_SCRIPTS = \
	$(call build,SCRIPTS,\
		for f in $(shell find $(SCRIPT_DIR) -type f -name *.lua); do \
			dst=$(INSTALL_SCRIPTS_DIR)/$${f\#\#$(SCRIPT_DIR)/}; \
			dstdir=`dirname $$dst`; \
			$(MKDIR) -p $$dstdir; \
			$(CP) $$f $$dst; \
		done)

make_loop = +$(foreach entry, $(1), $(MAKE) -C $(entry) $(2);)

# $1 = root_dir
# $2 = dir-target
define call_make_rule
	+$(MAKE) -C $(1)/$(word 1, $(subst _rule_, ,$@)) $(word 2, $(subst _rule_, ,$@))
endef

define call_make_rule_ex
	+$(MAKE) -C $(2)/$(call $(1), $(word 1, $(subst _rule_, ,$@))) $(word 2, $(subst _rule_, ,$@))
endef


# $1 - targets
# $2 - rule name
# Returns list of targets (combination of target name and rule name)
define targets_rules
$(foreach model, $1, $(model)_rule_$(strip $(2)))
endef


# evaluate once and only when used
# https://stackoverflow.com/a/28542922
# example: FOO = $(call eval_once,FOO,$(shell command))
define eval_once
$(eval $1 := $2)$(value $1)
endef