#! /usr/bin/make -f

# Tools
AR  = ar
CC  = gcc
CXX = g++

# Compiler flags
CFLAGS   = -Wall -Wextra -I include -D_GNU_SOURCE -std=c++17 -Og -g \
	   -fno-diagnostics-show-line-numbers
CXXFLAGS = $(CFLAGS)
# Linker flags
LDFLAGS  = $(CFLAGS) -Lbin -lfxos
# Dependency generation flags
DEPFLAGS = -MT $@ -MMD -MP -MF $(@:%.o=%.d)

# Default install prefix (beware of sudo...)
PREFIX  ?= $(HOME)/.local

#
#  Main targets
#

TARGETS := bin/fxos

all: $(TARGETS)

all-lib: bin/libfxos.a
all-fxos: bin/fxos

obj = $($1:%=build/%.o)
lex = $($1:%.l=build/%.yy.cpp.o)

## The library

src-lib := $(wildcard lib/*.cpp lib/*/*.cpp lib/*/*/*.cpp)
lex-lib := $(wildcard lib/*.l   lib/*/*.l   lib/*/*/*.l)

obj-lib := $(call obj,src-lib) $(call lex,lex-lib)

bin/libfxos.a: $(obj-lib) | bin/
	$(AR) rcs $@ $^

## The command-line interface

src-fxos := $(wildcard fxos/*.cpp fxos/*/*.cpp fxos/*/*/*.cpp)
obj-fxos := $(call obj,src-fxos)

bin/fxos: bin/libfxos.a $(obj-fxos) | bin/
	$(CXX) $(obj-fxos) -o $@ $(LDFLAGS)

#
#  Source targets
#

# C++ sources
build/%.cpp.o: %.cpp
	@mkdir -p $(dir $@)
	$(CXX) -c $< -o $@ $(CXXFLAGS) $(DEPFLAGS)

# C sources
build/%.c.o: %.c
	@mkdir -p $(dir $@)
	$(CC) -c $< -o $@ $(CFLAGS) $(DEPFLAGS)

# Flex lexers for the database
build/%.yy.cpp: %.l
	@mkdir -p $(dir $@)
	flex -o $@ -s $<
build/%.yy.cpp.o: build/%.yy.cpp
	$(CXX) -c $< -o $@ $(CFLAGS) -Wno-unused-function $(DEPFLAGS)

bin/:
	@mkdir -p $@

#
#  Dependency generation
#

include $(wildcard build/*/*.d build/*/*/*.d build/*/*/*/*.d)

.PHONY: all all-lib all-fxos clean clean-lib clean-fxos distclean

.PRECIOUS: build/%.d build/%.yy.cpp

#
#  Installing
#

m644 := -m 644
m755 := -m 755
sed  := -i -e '/^PREFIX=\\$$/ a \$(PREFIX)'

# Disable -m on Mac OS and use sed differently
ifeq "$(shell uname)" "Darwin"
m644 :=
m755 :=
sed  := -i '' -e "$$(printf '/^PREFIX=/ a \\\n$(PREFIX)')"
endif

install: $(TARGETS)
	install -d $(PREFIX)/bin
	install $(TARGETS) $(m755) $(PREFIX)/bin

uninstall:
	rm -f $(TARGETS:%=$(PREFIX)/%)

#
#  Cleaning
#

clean-lib:
	@rm -rf build/lib
clean-fxos:
	@rm -rf build/fxos

clean:
	@rm -rf build
distclean: clean
	@rm -rf bin