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#!/bin/bash
acc=0
in="first"
prompt="calc:"
pi="3.1415926535897932384626433832795028841971694"
e="2.7182818284590452353602874713526624977572471"
while [ "$in" != "" ]; do
in=$(echo "" | dmenu -q -h 18 -nb $1 -nf $2 -sb $3 -sf $4 -p "$prompt")
out=$(echo "pi=$pi; e=$e; $acc $in" | calc -p 2>&1 | tr -d "\n")
if [ "$out" = "Missing operator" ]; then
out=$(echo "pi=$pi; e=$e; $in" | calc -p 2>&1)
fi
# check for error output
if [ "${?#0}" != "" ]; then
out=$(echo "$out" | tr -d "\n")
prompt="calc: ($acc) err: $out"
else
acc=$out
prompt="calc: ($acc)"
fi
done
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