.PHONY: run clean install all docs man
.DELETE_ON_ERROR: $(BINDIR)/Getting_Started_with_GTK
.DEFAULT_GOAL: all

CPUS ?= $(shell (nproc --all || sysctl -n hw.ncpu) 2>/dev/null || echo 1)
MAKEFLAGS += --jobs=$(CPUS)

CC=gcc
DOXYGEN=doxygen
MAKEINFO=makeinfo
CFLAGS=`pkg-config --cflags gtk4 epoxy glib-2.0 libxml-2.0`
LDFLAGS=`pkg-config --libs gtk4 epoxy glib-2.0 libxml-2.0` -lGL -lGLU -lm -lepoxy -lX11 -lGLEW
WARNINGS = -Wall
DEBUG = -ggdb -fno-omit-frame-pointer \
	-fdiagnostics-color=always \
	-fsanitize=address,undefined -fstack-protector-strong
OPTIMIZE = -O3

BINDIR=bin
BUILDDIR=build
SRCDIR=src
DOCSDIR=docs
MANSRC=$(DOCSDIR)/rtfm/*.texi
MANDIR=$(DOCSDIR)/rtfm

SOURCES = $(shell find $(SRCDIR) -type f -name "*.c")
OBJECTS = $(patsubst %.c,$(BUILDDIR)/%.o,$(SOURCES))
DEPENDENCIES = $(patsubst %.c,$(BUILDDIR)/%.d,$(SOURCES))

all: $(BINDIR)/gem-graph-client

-include /etc/os-release

#
# Directories
#
$(BUILDDIR):
	@mkdir -p $@
	@echo "    MKDIR $@"

$(BINDIR):
	@mkdir -p $@
	@echo "    MKDIR $@"

#
# Dependencies
#
-include $(DEPENDENCIES)

$(BUILDDIR)/%.d: %.c Makefile | $(BUILDDIR)
	@mkdir -p $(shell dirname $@)
	@$(CC) $(CFLAGS) -MM -MT $(@:%.d=%.o) -MF $@ $<
	@echo "    DEP $@"

#
# Main program
#
$(BINDIR)/gem-graph-client: $(OBJECTS) | $(BINDIR)
	@$(CC) $(LDFLAGS) $(WARNINGS) $(DEBUG) $(OPTIMIZE) $^ -o $@
	@echo "    LD $@"

#
# Objects
#
$(BUILDDIR)/%.o: %.c Makefile | $(BUILDDIR)
	@mkdir -p $(shell dirname $@)
	@$(CC) $(CFLAGS) $(WARNINGS) $(DEBUG) $(OPTIMIZE) -c $< -o $@
	@echo "    CC $@"

#
# Manual
#
$(MANDIR)/gem-graph.pdf: $(MANSRC)
	cd $(BUILDDIR) && $(MAKEINFO) --pdf ../$(MANSRC) -o ../$(MANDIR)/gem-graph.pdf
	@echo "    MAKEINFO $(MANSRC)"

#
# Virtual recipes
#
install:
	@echo "Installing is not supported"

run: $(BINDIR)/gem-graph-client
	$(BINDIR)/gem-graph-client

docs: $(SOURCES) $(DEPENDENCIES)
	@$(DOXYGEN) $(DOCSDIR)/doxyfile
	@echo "    DOXYGEN $(DOCSDIR)/doxyfile"

man: $(MANDIR)/gem-graph.pdf

clean:
	@rm -rf $(BINDIR)
	@echo "    RM $(BINDIR)"
	@rm -rf $(BUILDDIR)
	@echo "    RM $(BUILDDIR)"
	@rm -rf $(MANDIR)/gem-graph.pdf
	@echo "    RM $(MANDIR)/gem-graph.pdf"

# More docs :
#       https://www.gnu.org/software/make/manual/
#	accessoirement : https://blog.stephane-robert.info/docs/makefile/  & /docs/task/