# Copyright (c) 2017-2018, Lawrence Livermore National Security, LLC.
# Produced at the Lawrence Livermore National Laboratory. LLNL-CODE-734707.
# All Rights reserved. See files LICENSE and NOTICE for details.
#
# This file is part of CEED, a collection of benchmarks, miniapps, software
# libraries and APIs for efficient high-order finite element and spectral
# element discretizations for exascale applications. For more information and
# source code availability see http://github.com/ceed.
#
# The CEED research is supported by the Exascale Computing Project 17-SC-20-SC,
# a collaborative effort of two U.S. Department of Energy organizations (Office
# of Science and the National Nuclear Security Administration) responsible for
# the planning and preparation of a capable exascale ecosystem, including
# software, applications, hardware, advanced system engineering and early
# testbed platforms, in support of the nation's exascale computing imperative.

# Note: PETSC_ARCH can be undefined or empty for installations which do not use
#       PETSC_ARCH - for example when using PETSc installed through Spack.
PETSc.pc := $(PETSC_DIR)/$(PETSC_ARCH)/lib/pkgconfig/PETSc.pc
CEED_DIR ?= ../..
ceed.pc := $(CEED_DIR)/lib/pkgconfig/ceed.pc

CC = $(call pkgconf, --variable=ccompiler $(PETSc.pc) $(ceed.pc))
CFLAGS = -std=c99 \
  $(call pkgconf, --variable=cflags_extra $(PETSc.pc)) \
  $(call pkgconf, --cflags-only-other $(PETSc.pc)) \
  $(OPT)
CPPFLAGS = $(call pkgconf, --cflags-only-I $(PETSc.pc) $(ceed.pc)) \
  $(call pkgconf, --variable=cflags_dep $(PETSc.pc))
LDFLAGS = $(call pkgconf, --libs-only-L --libs-only-other $(PETSc.pc) $(ceed.pc))
LDFLAGS += $(patsubst -L%, $(call pkgconf, --variable=ldflag_rpath $(PETSc.pc))%, $(call pkgconf, --libs-only-L $(PETSc.pc) $(ceed.pc)))
LDLIBS = $(call pkgconf, --libs-only-l $(PETSc.pc) $(ceed.pc)) -lm

OBJDIR := build
SRCDIR := src

src.c := elasticity.c $(sort $(wildcard $(SRCDIR)/*.c))
src.o = $(src.c:%.c=$(OBJDIR)/%.o)

all: elasticity

elasticity: $(src.o) | $(PETSc.pc) $(ceed.pc)
	$(call quiet,LINK.o) $(CEED_LDFLAGS) $^ $(LOADLIBES) $(LDLIBS) -o $@

.SECONDEXPANSION: # to expand $$(@D)/.DIR
%/.DIR :
	@mkdir -p $(@D)
	@touch $@

# Output using the 216-color rules mode
rule_file = $(notdir $(1))
rule_path = $(patsubst %/,%,$(dir $(1)))
last_path = $(notdir $(patsubst %/,%,$(dir $(1))))
ansicolor = $(shell echo $(call last_path,$(1)) | cksum | cut -b1-2 | xargs -IS expr 2 \* S + 17)
emacs_out = @printf "  %10s %s/%s\n" $(1) $(call rule_path,$(2)) $(call rule_file,$(2))
color_out = @if [ -t 1 ]; then \
				printf "  %10s \033[38;5;%d;1m%s\033[m/%s\n" \
					$(1) $(call ansicolor,$(2)) \
					$(call rule_path,$(2)) $(call rule_file,$(2)); else \
				printf "  %10s %s\n" $(1) $(2); fi
# if TERM=dumb, use it, otherwise switch to the term one
output = $(if $(TERM:dumb=),$(call color_out,$1,$2),$(call emacs_out,$1,$2))

# if V is set to non-nil, turn the verbose mode
quiet = $(if $(V),$($(1)),$(call output,$1,$@);$($(1)))

$(OBJDIR)/%.o : %.c | $$(@D)/.DIR
	$(call quiet,CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $(abspath $<)

# Rules for building the examples
#%: %.c

print: $(PETSc.pc) $(ceed.pc)
	$(info CC      : $(CC))
	$(info CFLAGS  : $(CFLAGS))
	$(info CPPFLAGS: $(CPPFLAGS))
	$(info LDFLAGS : $(LDFLAGS))
	$(info LDLIBS  : $(LDLIBS))
	@true

clean:
	$(RM) -r $(OBJDIR) elasticity *.vtu

$(PETSc.pc):
	$(if $(wildcard $@),,$(error \
	  PETSc config not found at $@. Please set PETSC_DIR and PETSC_ARCH))

.PHONY: all print clean

pkgconf = $(shell pkg-config $1 | sed -e 's/^"//g' -e 's/"$$//g')

-include $(src.o:%.o=%.d)