include premake.make

BIN := $(shell basename $$(pwd))

MANSECTION ?= 1
MANPAGE := $(BIN).$(MANSECTION)

SRCS := $(notdir $(wildcard src/*.cpp))
OBJS := $(SRCS:.cpp=.o)
DEPS := $(SRCS:.cpp=.d)

BUILDDIR := build/intermediates/
PREFIX ?= /usr/local
BINDIR ?= $(PREFIX)/bin
MANDIR ?= $(PREFIX)/man/man
CONFIGDIR ?= $(PREFIX)/etc
DATADIR ?= $(PREFIX)/share
DOCDIR ?= $(DATADIR)/$(BIN)/doc

CXX ?= g++
RM := /bin/rm -rf
INSTALL := /usr/bin/install -c

CXXFLAGS += -Wshadow -Wall -Wpedantic -Wextra -g -std=c++17
ifeq ($(DEBUG),1)
	CXXFLAGS += -D DEBUG -O0
	CONFIG := debug
else
	CXXFLAGS += -D NDEBUG -O3
	CONFIG := release
endif
OUTDIR := build/$(CONFIG)/

vpath %.cpp src
vpath %.d $(BUILDDIR)
vpath %.o $(BUILDDIR)

.PHONY: all clean install prebuild test dist-clean

all: prebuild $(OUTDIR)$(BIN)

prebuild:
	@mkdir -p $(BUILDDIR) $(OUTDIR)

$(OUTDIR)$(BIN): $(OBJS) $(DEPS)
	$(CXX) -o $(OUTDIR)$(BIN) $(LDFLAGS) $(LDLIBS) $(addprefix $(BUILDDIR),$(OBJS))
	@ln -sf $(OUTDIR)$(BIN) $(BIN)

%.o: %.cpp %.d
	$(CXX) $(CXXFLAGS) -MMD -MP -MT $@ -MF $*.d -c $<
	@mv $@ $*.d $(BUILDDIR)

-include $(BUILDDIR)*.d

%.d: ;

test:
	$(MAKE) -C tests && tests/tests

clean:
	$(RM) $(BUILDDIR)
	$(MAKE) -C tests clean

dist-clean:
	$(RM) build $(BIN)
	$(MAKE) -C tests clean

install:
	$(INSTALL) -d $(BINDIR)
	$(INSTALL) $(OUTDIR)$(BIN) $(BINDIR)
	$(INSTALL) -d $(MANDIR)$(MANSECTION)
	$(INSTALL) -m 0644 $(MANPAGE) $(MANDIR)$(MANSECTION)