makefile := $(abspath $(firstword $(MAKEFILE_LIST)))

srcdir ?= $(dir $(makefile))/src

ifneq ($(realpath $(dir $(makefile))),$(realpath $(CURDIR)))
builddir ?= .
else
builddir ?= ./build
endif

proc_srcdir := $(abspath $(srcdir))
proc_builddir := $(abspath $(builddir))

incdirs := include

CC := gcc
CX := g++
LD := g++

RM ?= rm

CFLAGS  := -O2
CXFLAGS := $(CFLAGS)

override CFLAGS    += -std=gnu99 -Wall -Werror -pedantic
override CXFLAGS   += -std=gnu++0x -Wall -Werror -pedantic
override LIBS      +=
override LINKFLAGS +=
override CPPFLAGS  += $(patsubst %,-I%,$(incdirs))

quiet ?= 1
ifeq ($(quiet),1)
.SILENT:
endif

PROGRAMS = irc
#$(notdir $(basename $(shell find $(proc_srcdir) -maxdepth 1 -type d -and -not -wholename $(proc_srcdir))))

.DEFAULT_GOAL = all

define program_template
$(1)_SRC := $$(shell find $(proc_srcdir)/ -type f -name '*.cpp')
$(1)_OBJ := $$(patsubst $(proc_srcdir)/%,$(proc_builddir)/%.o,$$($(1)_SRC))
$(1)_DEP := $$(patsubst %.o,%.d,$$($(1)_OBJ))

ifneq (,$$(findstring $(1),$$(MAKECMDGOALS)))
-include $$($(1)_DEP)
else
ifeq (,$$(MAKECMDGOALS))
-include $$($(1)_DEP)
else
ifeq (test,$$(MAKECMDGOALS))
-include $$($(1)_DEP)
else
ifeq (all,$$(MAKECMDGOALS))
-include $$($(1)_DEP)
endif
endif
endif
endif

$(1)_CFLAGS    := $$(CFLAGS)
$(1)_LINKFLAGS := $$(LINKFLAGS)
$(1)_CPPFLAGS  := $$(CPPFLAGS)
$(1)_LIBS      := $$(LIBS)

ifneq (,$$(wildcard $$(proc_srcdir)/$(1)/config.mk))
-include $$(proc_srcdir)/$(1)/config.mk
endif

$(1): $$($(1)_OBJ)
    @echo '  LD  $$@'
    $$(LD) $$(LINKFLAGS) $$(patsubst %,-l%,$$($(1)_LIBS)) -o $$@ $$($(1)_OBJ)

$$($(1)_DEP) : $(proc_builddir)/%.d : $(proc_srcdir)/%
    mkdir -p $$(dir $$@)
    @echo 'Generating dependencies for $$(subst $(proc_srcdir)/,,$$<)'
    $$(CC) -MM $$(CPPFLAGS) -MT $$@ -MT $$(patsubst %.d,%.o,$$@) $$< -o $$@

.PHONY: test-$(1)
test-$(1): $(1)
    ./$(1)

endef

$(foreach p,$(PROGRAMS),$(eval $(call program_template,$(p))))

.PHONY: all
all: $(PROGRAMS)

$(proc_builddir)/%.c.o : $(proc_srcdir)/%.c
    @echo '  CC  $(subst $(proc_builddir)/,,$@)'
    $(CC) -c $(CPPFLAGS) $(CFLAGS) $< -o $@

$(proc_builddir)/%.cpp.o : $(proc_srcdir)/%.cpp
    @echo '  CX  $(subst $(proc_builddir)/,,$@)'
    $(CX) -c $(CPPFLAGS) $(CXFLAGS) $< -o $@

.PHONY: clean
clean:
    -$(RM) $(PROGRAMS)
ifneq ($(builddir),.)
    -$(RM) -r $(builddir)
else
    -$(RM) -r $(shell find $(builddir) -maxdepth 1 -type d -not -name '.')
endif

.PHONY: distclean
distclean: clean

.PHONY: test
test: $(PROGRAMS)
    $(addsuffix ;,$(addprefix ./,$(PROGRAMS)))