#!/usr/bin/env bash

if [[ $# -eq 0 ]]; then
    echo "Usage: pcalc [PROBLEM]"
    exit 1
fi

# printf cmd will escape spaces & add quotes
# so 1+2 and 1 + 2 will have the same result
# (i think)
problem=$(printf "%q" "$@")

# if $problem contains spaces, trim it down
[[ "$problem" =~ [[:space:]] ]]; problem2="${problem//[[:space:]]/}"

# if $problem contains an "x", change to "*"
# sometimes i type "x" for multiplication
# perl by default does something else with "x"
[[ "$problem" =~ x ]]; problem2="${problem2//x/*}"

# fixes some weird thing where a backslash
# would fuck with the math
[[ "$problem" =~ \/ ]]; problem2="${problem2//\\}"

# -l adds a newline
# -e executes $problem
perl -le "print $problem2"