#!/usr/bin/env bash

help() {
    echo "Syntax: ./make_script_bin.sh [OPTIONS] FILE..."
    echo "options:"
    echo "  -h | --help         print this help message and exit"
    echo "  -i | --include      append an include directory for the assembler"
    echo "  -a | --assembler    path to the assembler executable"
    echo "  -o | --objcopy      path to the objcopy executable for data extraction"
    echo "  -d | --out-dir      directory for output files (default: current directory)"
}

INCLUDE_ARGS=()
SCRIPT_FILES=()
AS="arm-none-eabi-gcc"
OBJCOPY="arm-none-eabi-objcopy"
OUTDIR="."

while [[ $# -gt 0 ]] ; do
    case $1 in 
        -h|--help)
            help
            exit 0
            ;;
        -i|--include)
            INCLUDE_ARGS+=("-I$2")
            shift
            shift
            ;;
        -a|--assembler)
            AS="$2"
            shift
            shift
            ;;
        -o|--objcopy)
            OBJCOPY="$2"
            shift
            shift
            ;;
        -d|--out-dir)
            OUTDIR="$2"
            shift
            shift
            ;;
        *)
            SCRIPT_FILES+=("$1")
            shift
            ;;
    esac
done

for script_file in "${SCRIPT_FILES[@]}" ; do
    script_fname=${script_file##*/}
    script_noext=${script_fname%.*}

    # Target output files
    script_obj="$OUTDIR/$script_noext.o"
    script_bin="$OUTDIR/$script_noext"

    # Convert + clean-up
    $AS -c -x assembler-with-cpp "${INCLUDE_ARGS[@]}" -o "$script_obj" "$script_file"
    $OBJCOPY -O binary --file-alignment 4 "$script_obj" "$script_bin"
    rm "$script_obj"
done