# SPDX-License-Identifier: MIT

INSTALL ?= install
CARGO ?= cargo
CARGOFLAGS ?=
RONN ?= ronn
PKG_CONFIG ?= pkg-config
PREFIX ?= /usr
BUILDTYPE ?= release

SYSTEMD_UTIL_DIR := $(shell $(PKG_CONFIG) --variable=systemdutildir systemd)
SYSTEMD_SYSTEM_UNIT_DIR := $(shell $(PKG_CONFIG) --variable=systemdsystemunitdir systemd)
SYSTEMD_SYSTEM_GENERATOR_DIR := $(shell $(PKG_CONFIG) --variable=systemdsystemgeneratordir systemd)
export SYSTEMD_UTIL_DIR

ifeq ($(BUILDTYPE),release)
	override CARGOFLAGS := --release $(CARGOFLAGS)
endif

require_env = @[ -n "$($(1))" ] || { echo "\$$$(1) empty!" >&2; exit 1; }

.DEFAULT: build
.PHONY: build systemd-service program man check clean install

build: program systemd-service
ifndef NOMAN
build: man
endif

program:
	$(call require_env,SYSTEMD_UTIL_DIR)
	$(CARGO) build $(CARGOFLAGS)

systemd-service:
	$(call require_env,SYSTEMD_SYSTEM_GENERATOR_DIR)
	sed -e 's,@SYSTEMD_SYSTEM_GENERATOR_DIR@,$(SYSTEMD_SYSTEM_GENERATOR_DIR),' \
		<units/systemd-zram-setup@.service.in \
		>units/systemd-zram-setup@.service

man:
	$(RONN) --organization="zram-generator developers" man/*.md

check: program
	$(CARGO) test $(CARGOFLAGS)

clippy:
	$(call require_env,SYSTEMD_UTIL_DIR)
	$(CARGO) clippy $(CARGOFLAGS)

clean:
	$(CARGO) clean
	rm -f units/systemd-zram-setup@.service

ifndef NOBUILD
install: build
endif

install:
	$(call require_env,SYSTEMD_SYSTEM_GENERATOR_DIR)
	$(call require_env,SYSTEMD_SYSTEM_UNIT_DIR)
	$(call require_env,PREFIX)
	$(INSTALL) -Dpm755 target/$(BUILDTYPE)/zram-generator -t $(DESTDIR)$(SYSTEMD_SYSTEM_GENERATOR_DIR)/
	$(INSTALL) -Dpm644 units/systemd-zram-setup@.service -t $(DESTDIR)$(SYSTEMD_SYSTEM_UNIT_DIR)/
	$(INSTALL) -Dpm644 zram-generator.conf.example -t $(DESTDIR)$(PREFIX)/share/doc/zram-generator/
ifndef NOMAN
	$(INSTALL) -Dpm644 man/zram-generator.8 -t $(DESTDIR)$(PREFIX)/share/man/man8/
	$(INSTALL) -Dpm644 man/zram-generator.conf.5 -t $(DESTDIR)$(PREFIX)/share/man/man5/
endif