timeit

#!/bin/bash
# VERSION: 0.1

usage() {
    cat >&2 <<EOM
usage: $(basename "$0") [options] COMMAND

Time repeated execution of COMMAND.

options:
    -h             Print this help message
    -n NUMBER      Run NUMBER trials

EOM
}



NUM=1

while getopts hn: OPT; do
    case $OPT in
        h)
            usage
            exit 0
            ;;
        n)
            NUM="$OPTARG"
            ;;
        \?)
            usage
            exit 1
            ;;
    esac
done

shift $((OPTIND-1))

if [ $# -lt 1 ]; then
    usage
    exit 1
fi

logfile="$(mktemp)"
# shellcheck disable=SC2064
trap "rm '$logfile'" EXIT

start="$(date "+%s.%N")"
seq 1 "$NUM" | while read; do
    # TODO: verbose option
    #echo>&2 -n '.'
    /usr/bin/time -o "$logfile" -a --format '%e' "$@"
done
end="$(date "+%s.%N")"

echo>&2 ''

# WTF bash, no floating point numbers
sum="$(echo "scale=10; $end - $start" | bc -q)"
mean="$(echo "scale=10; $sum / $NUM" | bc -q)"

echo>&2 "count: $NUM"
echo>&2 "total: $(printf "%0.3f" "$sum")"
echo>&2 "mean:  $(printf "%0.3f" "$mean")"