include premake.make

# git commit hash and version for this build
COMMIT-HASH != git log 2>/dev/null | sed -e '1s/^commit //;q'
COMMIT := "const char* commit = \"$(COMMIT-HASH)\";"
VERSION := "const char* version = \"$(MAJOR).$(MINOR).$(PATCH)\";"

# some important install locations
PREFIX ?= /usr/local
BINDIR ?= $(PREFIX)/bin
CONFIGDIR ?= $(PREFIX)/etc
INCLUDEDIR ?= $(PREFIX)/include
LIBDIR ?= $(PREFIX)/lib
MANDIR ?= $(PREFIX)/man
DATADIR ?= $(PREFIX)/share/$(PROJ)
DOCDIR ?= $(DATADIR)/doc

# setup naming and versioning for library product
ifeq ($(UNAME_S), Darwin)
	LINKERNAME := $(PROJ).dylib
	SONAME := $(PROJ).$(MAJOR).dylib
	REALNAME := $(LINKERNAME)
else ifeq ($(UNAME_S), OpenBSD)
	REALNAME := $(PROJ).so.$(MAJOR).$(MINOR)
else ifeq ($(UNAME_S), Linux)
	LINKERNAME := $(PROJ).so
	SONAME := $(LINKERNAME).$(MAJOR)
	REALNAME := $(SONAME).$(MINOR).$(PATCH)
endif
STATICLIB := $(PROJ).a

# select default compiler
CXX ?= g++

# setup compiler flags and build config
CXXFLAGS += -Wshadow -Wall -Wpedantic -Wextra -Wno-unused-parameter
CXXFLAGS += -g3 -fPIC
ifeq ($(DEBUG), 1)
	CXXFLAGS += -DDEBUG -O0
	CONFIG := debug
else
	CXXFLAGS += -DNDEBUG -O3
	CONFIG := release
endif

# setup build locations
OUTDIR := build/$(CONFIG)
BUILDDIR := build/obj
BIN := $(OUTDIR)/$(PROJ)

# define sources and derived files
# allow for extra sources defined in premake.make
SRCS += $(notdir $(wildcard src/*.cpp))
OBJS := $(addprefix $(BUILDDIR)/, $(SRCS:.cpp=.o))
DEPS := $(addprefix $(BUILDDIR)/, $(SRCS:.cpp=.dep))
HDRS ?= $(wildcard src/*.hpp)
MANS := $(addprefix $(PREFIX)/, $(wildcard man/man*/*))

# if project supports plugins, link to libdl where needed
ifdef PLUGINS
ifeq ($(UNAME_S),Darwin)
	LDLIBS += -ldl
else ifeq ($(UNAME_S),Linux)
	LDLIBS += -ldl
endif
endif

# pattern rules ===========================================================

$(BUILDDIR)/%.o: src/%.cpp
ifeq ($(PRECOMPILE), 1)
	$(CXX) $(CXXFLAGS) -o $@ -include precomp.hpp -MMD -MP -MT $@ -MF $(BUILDDIR)/$*.dep -c $<
else
	$(CXX) $(CXXFLAGS) -o $@ -MMD -MP -MT $@ -MF $(BUILDDIR)/$*.dep -c $<
endif

%.dep: ;

$(MANDIR)/man1/%: man/man1/%
	install -m 0644 $< $@

$(MANDIR)/man3/%: man/man3/%
	install -m 0644 $< $@

$(MANDIR)/man5/%: man/man5/%
	install -m 0644 $< $@

# =========================================================== pattern rules

# targets =================================================================

.PHONY: all commit-hash version plugins test clean dist-clean install-plugins \
install install-data uninstall-data uninstall-plugins uninstall

# main target
ifeq ($(PRODUCT), tool)
all: $(BUILDDIR) $(OUTDIR) commit-hash version plugins $(BIN)
else ifeq ($(PRODUCT), lib)
all: $(BUILDDIR) $(OUTDIR) commit-hash version plugins $(OUTDIR)/$(REALNAME) $(OUTDIR)/$(STATICLIB)
endif

$(BUILDDIR):
	mkdir -p $@

$(OUTDIR):
	mkdir -p $@

# product build rules
ifeq ($(PRODUCT), tool) # -------------------------------------------- tool

ifeq ($(PRECOMPILE), 1)
$(BIN): precomp.hpp.gch $(OBJS)
else
$(BIN): $(OBJS)
endif
	$(CXX) -o $(BIN) $(LDFLAGS) $(OBJS) $(LDLIBS)
	@ln -sf $(BIN) $(PROJ)

endif # -------------------------------------------------------------- tool

ifeq ($(PRODUCT), lib) # ---------------------------------------------- lib

ifeq ($(PRECOMPILE), 1)
$(OUTDIR)/$(REALNAME): precomp.hpp.gch $(OBJS)
else
$(OUTDIR)/$(REALNAME): $(OBJS)
endif
ifeq ($(UNAME_S),Darwin)
	$(CXX) -dynamiclib -o $(OUTDIR)/$(REALNAME) -install_name $(LIBDIR)/$(REALNAME) \
-current_version $(MAJOR) -compatibility_version $(MINOR) $(LDFLAGS) $(OBJS) $(LDLIBS)
else ifeq ($(UNAME_S),OpenBSD)
	$(CXX) -g -shared -Wl,-soname,$(REALNAME) -o $(OUTDIR)/$(REALNAME) $(LDFLAGS) $(OBJS) $(LDLIBS)
else ifeq ($(UNAME_S),Linux)
	$(CXX) -g -shared -Wl,-soname,$(SONAME) -o $(OUTDIR)/$(REALNAME) $(LDFLAGS) $(OBJS) $(LDLIBS)
endif

$(OUTDIR)/$(STATICLIB): $(OBJS)
	ar r $(OUTDIR)/$(STATICLIB) $(OBJS)

ifeq ($(GENERATELIBHEADER),1)
$(OUTDIR)/$(PROJ).hpp: $(HDRS)
	@echo updating $(OUTDIR)/$(PROJ).hpp
	@cp /dev/null $(OUTDIR)/$(PROJ).hpp
	@for h in $(HDRS); \
	do \
		sed '/@exclude/d' $$h >> $(OUTDIR)/$(PROJ).hpp; \
	done
endif

endif # --------------------------------------------------------------- lib

# get generated dependencies, if any
-include $(DEPS)

commit-hash:
	@if ! echo $(COMMIT) | diff -q src/commit.inc - >/dev/null 2>&1 ;\
	then \
		echo $(COMMIT) > src/commit.inc ;\
	fi

version:
	@if ! echo $(VERSION) | diff -q src/version.inc - >/dev/null 2>&1 ;\
	then \
		echo $(VERSION) > src/version.inc ;\
	fi

$(BUILDDIR)/version.o: src/version.inc src/commit.inc

precomp.hpp.gch: src/precomp.hpp
	$(CXX) $< $(CXXFLAGS) -o $@

plugins:
ifdef PLUGINS
	@for plug in $(PLUGINS) ;\
	do \
		$(MAKE) -C $$plug ;\
	done
endif

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

clean:
	rm -rf $(BUILDDIR) tests/build tests/tests tests/src/commit.inc tests/src/version.inc
ifdef PLUGINS
	@for plug in $(PLUGINS) ;\
	do \
		$(MAKE) -C $$plug clean ;\
	done
endif

dist-clean: clean
	rm -rf build $(PROJ) src/commit.inc src/version.inc precomp.hpp.gch

$(MANDIR)/man1:
	install -m 0755 -d $@

$(MANDIR)/man3:
	install -m 0755 -d $@

$(MANDIR)/man5:
	install -m 0755 -d $@

$(DATADIR):
	install -m 0755 -d $@

# (un)install targets

ifdef DATAFILES
install-data: $(DATADIR)
	install -m 0644 $(DATAFILES) $(DATADIR)
else
install-data:
endif

uninstall-data:
	rm -rf $(DATADIR)

install-plugins:
ifdef PLUGINS
	@for plug in $(PLUGINS) ;\
	do \
		$(MAKE) -C $$plug install ;\
	done
endif

uninstall-plugins:
ifdef PLUGINS
	@for plug in $(PLUGINS) ;\
	do \
		$(MAKE) -C $$plug uninstall ;\
	done
endif

ifeq ($(PRODUCT), tool) # -------------------------------------------- tool

$(BINDIR):
	install -m 0755 -d $@

install: $(MANDIR)/man1 $(MANDIR)/man3 $(MANDIR)/man5 $(BINDIR) $(MANS) install-data install-plugins
	install -m 0755 $(BIN) $(BINDIR)

uninstall: uninstall-data uninstall-plugins
	rm -f $(BINDIR)/$(PROJ) $(MANS)

endif # -------------------------------------------------------------- tool

ifeq ($(PRODUCT), lib) # ---------------------------------------------- lib

$(LIBDIR):
	install -m 0755 -d $@

$(INCLUDEDIR):
	install -m 0755 -d $@

$(INCLUDEDIR)/$(PROJ):
	install -m 0755 -d $@

ifeq ($(GENERATELIBHEADER), 1)
install: $(MANDIR)/man1 $(MANDIR)/man3 $(MANDIR)/man5 $(LIBDIR) $(INCLUDEDIR) $(MANS) $(OUTDIR)/$(PROJ).hpp install-data install-plugins
	install -m 0644 $(OUTDIR)/$(PROJ).hpp $(INCLUDEDIR)
else
install: $(MANDIR)/man1 $(MANDIR)/man3 $(MANDIR)/man5 $(LIBDIR) $(INCLUDEDIR) $(MANS) $(INCLUDEDIR)/$(PROJ) install-data install-plugins
	install -m 0644 $(HDRS) $(INCLUDEDIR)/$(PROJ)
endif
	install -m 0644 $(OUTDIR)/$(REALNAME) $(LIBDIR)
	install -m 0644 $(OUTDIR)/$(STATICLIB) $(LIBDIR)
ifeq ($(UNAME_S), Darwin)
	cd $(LIBDIR) && ln -sf $(REALNAME) $(SONAME)
else ifeq ($(UNAME_S), Linux)
ifeq ($(USER), root)
	ldconfig
else
	cd $(LIBDIR) && ln -sf $(REALNAME) $(SONAME)
endif
	cd $(LIBDIR) && ln -sf $(SONAME) $(LINKERNAME)
else ifeq ($(UNAME_S), OpenBSD)
	ldconfig -R
endif

uninstall: uninstall-data uninstall-plugins
	rm -rf $(INCLUDEDIR)/$(PROJ).hpp $(INCLUDEDIR)/$(PROJ) $(MANS) $(LIBDIR)/$(STATICLIB) $(LIBDIR)/$(REALNAME) $(LIBDIR)/$(SONAME) $(LIBDIR)/$(LINKERNAME)
ifeq ($(UNAME_S), Linux)
	ldconfig
else ifeq ($(UNAME_S), OpenBSD)
	ldconfig -R
endif

endif # --------------------------------------------------------------- lib

# ================================================================= targets

# project-specific targets go in here
-include postmake.make