include premake.make

LIBNAME := $(shell basename $$(pwd))
MAJOR := 1
MINOR := 0.0

UNAME_S := $(shell uname -s)

ifeq ($(UNAME_S),Darwin)
	LINKERNAME := $(LIBNAME).dylib
	SONAME := $(LIBNAME).$(MAJOR).dylib
	REALNAME := $(LINKERNAME)
else
	LINKERNAME := $(LIBNAME).so
	SONAME := $(LINKERNAME).$(MAJOR)
	REALNAME := $(SONAME).$(MINOR)
endif

BUILDDIR := build/intermediates/
PREFIX ?= /usr/local
BINDIR ?= $(PREFIX)/bin
CONFIGDIR ?= $(PREFIX)/etc
INCLUDEDIR ?= $(PREFIX)/include
LIBDIR ?= $(PREFIX)/lib
DATADIR ?= $(PREFIX)/share
MANDIR ?= $(DATADIR)/man
DOCDIR ?= $(DATADIR)/$(LIBNAME)/doc

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

CXX ?= g++

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

RM := /bin/rm -rf
INSTALL := /usr/bin/install -c

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

.PHONY: all clean install prebuild test

all: prebuild $(OUTDIR)$(REALNAME)

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

$(OUTDIR)$(REALNAME): $(OBJS) $(DEPS)
ifeq ($(UNAME_S),Darwin)
	$(CXX) -dynamiclib -o $(OUTDIR)$(REALNAME) -current_version $(MAJOR) \
		-compatibility_version $(MINOR) $(LDFLAGS) $(LDLIBS) $(addprefix $(BUILDDIR),$(OBJS))
else
	$(CXX) -g -shared -Wl,-soname,$(SONAME) -o $(OUTDIR)$(REALNAME) $(LDFLAGS) $(LDLIBS) $(addprefix $(BUILDDIR),$(OBJS))
endif

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

-include $(BUILDDIR)*.d

%.d: ;

build/$(LIBNAME).hpp: $(HDRS)
	@echo updating build/$(LIBNAME).hpp
	@cp /dev/null build/$(LIBNAME).hpp
	@for h in $(HDRS); \
	do \
		cat $$h >> build/$(LIBNAME).hpp; \
	done

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

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

install: $(OUTDIR)$(REALNAME) build/$(LIBNAME).hpp
	$(INSTALL) -d $(LIBDIR)
	$(INSTALL) -m 644 $(OUTDIR)$(REALNAME) $(LIBDIR)
	$(INSTALL) -d $(INCLUDEDIR)
	$(INSTALL) -m 644 build/$(LIBNAME).hpp $(INCLUDEDIR)
ifeq ($(UNAME_S),Darwin)
	cd $(LIBDIR) && ln -sf $(REALNAME) $(SONAME)
else
	ldconfig
	cd $(LIBDIR) && ln -sf $(SONAME) $(LINKERNAME)
endif