export ZCALC_HISTFILE="${HOME}/.zcalc_history"

autoload -U zcalc

function __format_number() {
    local num="${1}"
    local res

    num="$(echo "${num}" |  sed 's/\.$//')"
    res="${num}"

    if [[ "${num}" =~ ^[-]?[0-9]+$ ]]; then
        res="$(LC_NUMERIC='en_US.UTF-8' printf "%'.20f\n" "${num}" | sed "s/,/_/g")"
    fi

    echo "${res}" | sed 's/\.\([0-9]*[1-9]\)0*$/.\1/; s/\.0*$//'
}

function __calc {
    local result
    result="$(ZDOTDIR="${HOME}" zcalc -f -e "$*" 2>/dev/null)"

    __format_number "${result}"
}

aliases[calc]='noglob __calc'
aliases[=]='noglob __calc'


function accept-line() {
    if [[ ${BUFFER} =~ '^[ ]?\(?[-+]?[0-9]+[^a-zA-Z]+' ]]; then
        echo
        test "${BUFFER[1]}" != " " && print -S -- "${BUFFER}"  # saving the command to history
        __calc "${BUFFER}"
        BUFFER=
    fi

    zle .${WIDGET}
}

zle -N accept-line

# vim: ft=zsh