# MakeFile for placeholder 
# Created mm/dd/yyyy
# Authored by: xavi


#    ----------------------
#    | THIS IS A TEMPLATE |
#    ----------------------
# TODO:
# %s/placeholder/project_name/g
# Change date file was created to today
# run make dirs to create project hierarchy
# Place headers in include and source files in src
.POSIX:

# DIRECTORIES
SRC_DIR := src
INCLUDE_DIR := include
OBJ_DIR := obj
TESTS_DIR := tests
SUBMODULES_DIR := submodules

# Final Binary Name
PROJECT_NAME := placeholder
PROJECT_OBJ := $(OBJ_DIR)/$(PROJECT_NAME).o

# SUBMODULE VARS FOR GENERATING STATIC LIBS
SUBMODULES := $(wildcard $(SUBMODULES_DIR)/*)
SUBBARE := $(SUBMODULES:$(SUBMODULES_DIR)/%=%)
SUBMODULE_SLIB := $(foreach m,$(SUBBARE),$(SUBMODULES_DIR)/$(m)/$(m).a)


STATIC_LIBS = $(shell find ./ -name "*.a")

# C compiler settings
CC := gcc
INCLUDE_LIST := $(foreach m,$(SUBMODULES),$(m)/$(INCLUDE_DIR)) $(INCLUDE_DIR)
INCLUDES := $(addprefix -I,$(INCLUDE_LIST))
CFLAGS := -ggdb $(INCLUDES) -Wall -Wextra -MMD -MP
DFLAGS := 

# Main Executable Filename
MAIN := main.c

# Files
SRC := $(filter-out $(SRC_DIR)/$(MAIN), $(wildcard $(SRC_DIR)/*.c))
OBJ := $(SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)
TESTS := $(wildcard $(TESTS_DIR)/*.c)

# Get Dependencies from gcc using -MMD and -MP
DEPENDENCIES := $(OBJ:%.o=%.d)

all: $(PROJECT_NAME)

# CREATE STATIC LIBRARY OF MODULE
$(PROJECT_NAME).a: $(PROJECT_OBJ) check_submods
	ar rcs $(@) $(<)

# CREATE TEST EXECUTABLES
$(TESTS:$(TESTS_DIR)/%.c=%): %: $(OBJ_DIR)/%.o $(OBJ) check_submods
	$(CC) $(CFLAGS) $(DFLAGS) -o $(@) $(<) $(OBJ) $(STATIC_LIBS)

# CREATE TEST OBJS
$(OBJ_DIR)/%.o: $(TESTS_DIR)/%.c $(OBJ)
	$(CC) $(CFLAGS) $(DFLAGS) -c -o $(@) $(^)

# CREATE MAIN OBJ
$(PROJECT_NAME): $(MAIN:%.c=$(OBJ_DIR)/%.o) $(OBJ) check_submods
	$(CC) $(CFLAGS) $(DFLAGS) -o $(@) $(<) $(OBJ) $(STATIC_LIBS)

# CREATE OBJS
$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c
	$(CC) $(CFLAGS) $(DFLAGS) -c -o $(@) $(<)

# RECURSE THROUGH SUBMODULES AND RUN MAKE *.a
$(SUBMODULE_SLIB): 
	$(MAKE) -C $(dir $(@)) $(notdir $(@))

check_submods: $(SUBMODULE_SLIB)


# RECURSE AND CLEAN ALL FILES
clean:
	@for sm in $(SUBMODULES) ; do \
		$(MAKE) -C $$sm clean ; \
	done
	rm -f $(PROJECT_NAME) $(OBJ_DIR)/* $(TESTS:$(TESTS_DIR)/%.c=%) ./*.a

-include $(DEPENDENCIES)

help:
	@echo "SUBMODULES: $(SUBMODULES)"
	@echo "SUBMODULE_SLIB: $(SUBMODULE_SLIB)"
	@echo "STATIC_LIBS: $(STATIC_LIBS)"

.PHONY: clean all check_submods help

# Create Project Hierarchy 

dirs: $(SRC_DIR) $(OBJ_DIR) $(TESTS_DIR) $(INCLUDE_DIR) $(SUBMODULES_DIR) $(SRC_DIR)/$(MAIN)

$(SRC_DIR) $(OBJ_DIR) $(TESTS_DIR) $(INCLUDE_DIR) $(SUBMODULES_DIR):
	mkdir -p $(@)

$(SRC_DIR)/$(MAIN):
	touch $(SRC_DIR)/$(MAIN)