# Prints the lines of a command '$2' output which contain the text '$1'.
grepcmd () {
    grepcmd_output="$( $2 )"
    printf "$grepcmd_output\n" | while IFS= read -r grepcmd_line
    do
        case "$grepcmd_line" in
        *"$1"*)
            printf '%s\n' "$grepcmd_line"
            ;;
    esac
    done
    return 0
}

# Checks if a command '$2' output contains the text '$1'.
grepcmd_check () {
    grepcmd_check_output="$( $2 )"
    printf "$grepcmd_check_output\n" | while IFS= read -r grepcmd_check_line
    do
        case "$grepcmd_check_line" in
        *"$1"*)
            return 0
            ;;
    esac
    done
    return 1
}

# Trims the leading and trailing whitespace characters of '$1' variable.
trimmer () {
    trimmer_line="$1"
    trimmer_line="${trimmer_line#"${trimmer_line%%[![:space:]]*}"}"
    trimmer_line="${trimmer_line%"${trimmer_line##*[![:space:]]}"}"
    printf "$trimmer_line\n"
    return 0
}

# Prints the remaining free space at coreboot '$3' ROM using '$2' cbfstool.
cbfs_freespacer () {
    cbfs_freespacer_line=$( grepcmd "(empty)" "$2 $3 print" )
    if grepcmd_check "empty" "
    cbfs_freespacer_line=${cbfs_freespacer_line#??????????????????????????????????????????????}
    cbfs_freespacer_line=${cbfs_freespacer_line%????}
    cbfs_freespacer_line=$( trimmer "$cbfs_freespacer_line" )
    cbfs_freespacer_line=$(( "$cbfs_freespacer_line" / 1024 ))
    printf "$cbfs_freespacer_line K\n"
}

cbfs_freespacer "$1" "./build/cbfstool" "./build/coreboot.rom"