# steps to build an image:
# --- here
# 1. initialize new profile (BUILDDIR) as a copy of image.in/
# 2. configure distro
# 3. copy the needed bits from metaprofile to a new profile
# --- in BUILDDIR
# 4. build subprofiles and subsequently an image

MKIMAGE_PROFILES = $(dir $(lastword $(MAKEFILE_LIST)))

# deal with one target at a time
IMAGE_TARGET := $(firstword $(MAKECMDGOALS))#	ve/generic.tar.gz
ifeq (./,$(dir $(IMAGE_TARGET)))#		convenience fallback
IMAGE_TARGET := distro/$(IMAGE_TARGET)#		for omitted "distro/"
endif
IMAGE_CONF    := $(firstword $(subst ., ,$(IMAGE_TARGET)))# ve/generic
IMAGE_CLASS   := $(firstword $(subst /, ,$(IMAGE_TARGET)))# ve
IMAGE_FILE    := $(lastword  $(subst /, ,$(IMAGE_TARGET)))# generic.tar.gz
IMAGE_NAME    := $(firstword $(subst ., ,$(IMAGE_FILE)))#   generic
IMAGE_TYPE    := $(subst $(IMAGE_NAME).,,$(IMAGE_FILE))#    tar.gz

# readjustable
ifeq (1,$(NUM_TARGETS))
BUILDDIR_PREFIX ?= mkimage-profiles.build
else
BUILDDIR_PREFIX ?= mkimage-profiles.build/$(IMAGE_CONF).$(ARCH)
endif

# preferences
-include $(HOME)/.mkimage/profiles.mk

# most of the actual work done elsewhere
include lib/*.mk
include conf.d/*.mk
include features.in/*/config.mk

DISTRO_TARGETS := $(shell sed -n 's,^\(distro/[^:.]\+\):.*$$,\1,p' \
		lib/distro.mk $(wildcard conf.d/*.mk) | sort -u)
VE_TARGETS := $(shell sed -n 's,^\(ve/[^:.]\+\):.*$$,\1,p' \
		lib/ve.mk $(wildcard conf.d/*.mk) | sort -u)
DISTROS := $(call addsuffices,$(DISTRO_EXTS),$(DISTRO_TARGETS))
VES     := $(call addsuffices,$(VE_EXTS),$(VE_TARGETS))
IMAGES  := $(DISTROS) $(VES)

.PHONY: $(IMAGES) $(DISTRO_TARGETS) $(VE_TARGETS)
.PHONY: debug everything help space

distro/help:
	@echo '** available distribution targets:'
	@echo $(DISTROS) | fmt -sw"$$((COLUMNS>>1))" | column -t

ve/help:
	@echo '** available virtual environment targets:'
	@echo $(VES) | fmt -sw"$$((COLUMNS>>1))" | column -t

help: | distro/help space ve/help
space:; @echo

### duplicate but still needed
everything:
	@n=1; sum=$(words $(DISTROS)); \
	for distro in $(DISTROS); do \
		echo "** building $$distro [$$n/$$sum]:"; \
		$(MAKE) -f main.mk --no-print-directory $$distro; \
		[ "$$n" -lt "$$sum" ] && echo; \
		n=$$(($$n+1)); \
	done

# config/with/ve/generic config/like/ve config/name/generic config/pack/tar.gz
$(IMAGES): debug \
	config/with/$(IMAGE_CONF) \
	config/like/$(IMAGE_CLASS) \
	config/name/$(IMAGE_NAME) \
	config/pack/$(IMAGE_TYPE) \
	build; @:

# convenience shortcut
$(DISTROS:distro/%=%): %: distro/%

debug:
ifeq (2,$(DEBUG))
	@$(foreach v,\
		$(filter IMAGE_%,$(sort $(.VARIABLES))),\
		$(warning $v = $($v)))
endif