LIBGL  := -lGL -lGLU
LIBSDL := `sdl-config --libs`
LIBS   := ${LIBSDL} ${LIBGL}

OPTFLAGS := -O2
DBGFLAGS := -ggdb
PRFFLAGS := ${DBGFLAGS} -pg
MYFLAGS  := -Wall -pedantic -ansi

VALFLAGS := --leak-check=full
CXXFLAGS := ${MYFLAGS} ${DBGFLAGS}

CXX := g++

DIRS := # := start

SRCSDIR := src/
SRCS    := # := start

OBJSDIR := objsd/
OBJS    := # := start

DEPSDIR := deps/
DEPS    := # := start

# include all of the dir.mk
DIRMK   := dir.mk
include ${SRCSDIR}${DIRMK}

WORKINGDIR  := bind/

CFGDIRNAME := configs/
SRCCFGDIR  := ${CFGDIRNAME}
DSTCFGDIR  := ${WORKINGDIR}${CFGDIRNAME}

CFGS := # := start
CFGS += keys.cfg
CFGS := $(addprefix ${DSTCFGDIR},${CFGS})

TARGETNAME  := run_physics
TARGETTMP   := ${OBJSDIR}${TARGETNAME}
TARGET      := ${WORKINGDIR}${TARGETNAME}

DEPSBLDDIRS := ${DEPSDIR} $(addprefix ${DEPSDIR},${DIRS})
OBJSBLDDIRS := ${OBJSDIR} $(addprefix ${OBJSDIR},${DIRS})
BLDDIRS     := ${OBJSBLDDIRS} ${DEPSBLDDIRS} ${WORKINGDIR} ${DSTCFGDIR}

INCDIRS     := ${SRCSDIR}


PRNTFMT := printf "%-5s: %s\n"

VERBOSE := 0

ifeq (${VERBOSE},0)
    # quiet the printf command
    Q1 := @
    # quiet the command that is `replaced' by an echo
    Q2 := @
else
    # EAT the printf command as if it was not there
    Q1 := @true # NOTE: the space between @true and the # is VERY important!!
    # do not quiet the command output
    Q2 :=
endif

.PHONY: all
all: ${TARGET} ${CFGS}

# how to link the main target
${TARGETTMP}: ${OBJS}
	${Q1}${PRNTFMT} "${CXX}" "$@"
	${Q2}${CXX} ${CXXFLAGS} -o $@ $^ ${LIBS}

# rule to copy tmp target to working directory
${TARGET}: ${TARGETTMP} | ${WORKINGDIR}
	${Q1}${PRNTFMT} "cp" "$@"
	${Q2}cp $< $@

# how to make a directory
${BLDDIRS}:
	${Q1}${PRNTFMT} "mkdir" "$@"
	${Q2}mkdir -p $@

#${SRCSDIR}%.cpp: ${SRCSDIR}%.h

# cause the below directory rules to work out
.SECONDEXPANSION:

# rule to make an object file from a .cpp
${OBJSDIR}%.o: ${SRCSDIR}%.cpp | $$(dir $$@)
	${Q1}${PRNTFMT} "${CXX}" "$@"
	${Q2}${CXX} ${CXXFLAGS} -c -o $@ $< -I "${INCDIRS}"

# rule to make a depend file from a .cpp
#   be clever and escape the / chars in file paths
#   DON'T simply use another sed delimiter or it can't appear in the file paths
${DEPSDIR}%.d: ${SRCSDIR}%.cpp | $$(dir $$@)
	${Q1}${PRNTFMT} "DEP" "$@"
	${Q2}${CXX} -MM ${CXXFLAGS} $< -I "${INCDIRS}" | \
		sed 's/\(^.*\):/$(subst /,\/,${OBJSDIR}\1 $@):/' > $@

# rule to copy the config files into the working directory
${DSTCFGDIR}%.cfg: ${SRCCFGDIR}%.cfg | $$(dir $$@)
	${Q1}${PRNTFMT} "cp" "$@"
	${Q2}cp $< $@


.PHONY: clean
clean:
	${Q1}${PRNTFMT} "rm" "${OBJSDIR}"
	${Q2}rm -rf ${OBJSDIR}
	${Q1}${PRNTFMT} "rm" "${TARGET} ${TARGETTMP}"
	${Q2}rm -f ${TARGET}

.PHONY: distclean
distclean: clean
	${Q1}${PRNTFMT} "rm" "${DEPSDIR}"
	${Q2}rm -rf ${DEPSDIR}
	${Q1}${PRNTFMT} "rm" "tags prof gmon.out"
	${Q2}rm -f tags prof gmon.out

.PHONY: gitclean
gitclean:
	${Q1}${PRNTFMT} "git clean" "showing; use gitcleanf to force removal"
	${Q2}git clean -nxd

.PHONY: gitcleanf
gitcleanf:
	${Q1}${PRNTFMT} "git clean" "forcing"
	${Q2}git clean -fxd

.PHONY: tar
tar: physics.tar.bz2

.PHONY: physics.tar.bz2
physics.tar.bz2:
	@${PRNTFMT} "git archive" "Warning, archives HEAD not current"
	${Q1}${PRNTFMT} "git archive" "physics.tar.bz2"
	${Q2}git archive --prefix=physics/ HEAD | bzip2 > physics.tar.bz2

.PHONY: run
run: all
	cd ${WORKINGDIR}; ./${TARGETNAME}

.PHONY: gdb
gdb: all
	cd ${WORKINGDIR}; gdb ${TARGETNAME}

.PHONY: cgdb
cgdb: all
	cd ${WORKINGDIR}; cgdb ${TARGETNAME}

.PHONY: val
val: all
	cd ${WORKINGDIR}; valgrind ${VALFLAGS} ./${TARGETNAME}

.PHONY: prof
prof: run
	cd ${WORKINGDIR}; gprof -b ${TARGETNAME} > prof
	cd ${WORKINGDIR}; kprof -f prof


MINGMAKEARGS := "LIBGL      := -lopengl32 -lglu32" \
                "LIBSDL     := `/usr/mingw32/bin/sdl-config --libs`" \
                "CXXFLAGS   := ${OPTFLAGS}" \
                "CXX        := mingw32-g++" \
                "OBJSDIR    := objs-mingw32/" \
                "WORKINGDIR := bin-mingw32/" \
                "TARGETNAME := run_physics.exe"

.PHONY: mingw32
mingw32:
	${Q1}${PRNTFMT} "make" "mingw32"
	${Q2}${MAKE} ${MINGMAKEARGS} clean all

FINALMAKEARGS := "CXXFLAGS   := ${OPTFLAGS}" \
                 "OBJSDIR    := objs/" \
                 "WORKINGDIR := bin/"

.PHONY: final
final:
	${Q1}${PRNTFMT} "make" "final"
	${Q2}${MAKE} ${FINALMAKEARGS} clean all


-include ${DEPS}