#! /bin/sh
# Detect if the directory is a c/c++ project
# Create a makefile with existing c/c++ files in directory
# 	Rules are basic (i.e. module.o : module.c)
# 	variables are generic
# Exit by opening makefile with neovim

headers_list="$(ls | grep '.h$')"
sources_list="$(ls | grep '.cp*$')"
modules_list="$(echo "$sources_list" | sed 's/\.cp*//g' | tr '\n' ' ')"
targets_list="$(echo "$sources_list" | sed 's/\.cp*/\.o/g' | tr '\n' ' ')"
bool=false
comp=gcc

get_compiler(){
	for source_ in "$sources_list"; do
		case "$source_" in
			*.cpp) comp="g++" && return;;
			*.c) ;;
		esac
	done
}

is_c_project(){
	if [ -n "$sources_list" ]; then
		bool=true
	fi
}

make_rule(){
	if [ "$comp" = "gcc" ]; then
		echo "$1.o : $1.c" >> makefile
		echo -e "\t\$(CC) -c $1.c \$(FLAGS)" >> makefile
	else
		echo "$1.o : $1.cpp" >> makefile
		echo -e "\t\$(CC) -c $1.cpp \$(FLAGS)" >> makefile
	fi
	echo "" >> makefile
}

is_c_project

if [ "$bool" = false ]; then
	echo "No C/C++ project in directory. Exiting..."
	exit 1
fi

get_compiler

touch makefile

echo "BIN = main" > makefile
echo "TARGETS = $targets_list" >> makefile
echo "" >> makefile
echo "CC = $comp" >> makefile
echo "FLAGS = -Wall -g" >> makefile
echo "" >> makefile
echo "all : \$(BIN)" >> makefile
echo "" >> makefile
echo "\$(BIN) : \$(TARGETS)" >> makefile
echo -e "\t\$(CC) \$(TARGETS) -o \$(BIN) \$(FLAGS)" >> makefile
echo "" >> makefile

for module in $modules_list; do
	make_rule "$module"
done

echo "clean :" >> makefile
echo -e "\trm \$(BIN) *.o vgcore.*" >> makefile

sed -i 's/\s$//' makefile
nvim makefile