q.sh/q-calc

#!/bin/sh

ENV_bc=bc
ENV_wl_copy=wl-copy
ENV_cut=cut

calc() {
    res="$(echo "$1" | $ENV_bc 2>/dev/null)"
    if [ "$res" == "" ]; then
        res="-"
    fi
    echo "$res"
}

if [[ -z "$@" ]]; then
    echo "^= .*$"
elif [[ "$1" == "--hint" ]]; then
    shift
    echo "- = "
elif [[ "$1" == "--complete" ]]; then
    shift
    EXPR="$(echo "$@" | cut -d ' ' -f2-)"
    RES="$(calc "$EXPR")"
    echo "$RES = $EXPR -> $(calc "$EXPR")"
elif [[ "$1" == "--preview" ]]; then
    shift
    echo "$1"
elif [[ "$1" == "--run" ]]; then
    shift
    echo "$1"
    echo "$1" | (nohup $ENV_wl_copy -n 2>/dev/null &)
elif [[ "$1" == "--cli" ]]; then
    shift
    calc "$(echo "$@" | $ENV_cut -d ' ' -f2-)"
else
    echo "Unexpected arguments: $@"
fi