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#!/usr/bin/env bash
#
# calculates rolling average for numbers via stdin
#
# here's an example with hledger:
#
# hledger bal ^in cur:USD -MA --end=thismonth --output-format=csv \
# | tail -n 1 \
# | cut -d',' -f 2- \
# | tr -d '" USD-' \
# | tr ',' '\n' \
# | rollingavg
n=0
total=0
declare -i n
while read i
do
n+=1
total=$(bc -l <<< "$total + $i")
printf "%.2f\n" $(bc -l <<< "$total / $n")
done
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