#!/bin/bash
# Copyright (C) 2016 Ian Kelling

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

wpm-game() {
    local help="Usage: wpm-game [--help]
Typing speed game

Starts counting when you type a non-space.
Starts over and prints the scrore when you press enter."
    if [[ $1 == --help ]]; then
        echo "$help"
        return 0
    fi
    local x line chars seconds
    local TIMEFORMAT=%R
    while true
    do
	line=()
	while ! [[ $line ]] || [[ $line == [[:space:]] ]] ; do
	    read -n 1 line
	done
	x=$( { time read line; echo "$line"; } 2>&1 )
	seconds=${x%%[[:space:]]*}
	x="${x#$seconds}"
	chars=$(( ${#x} + 1 )) # +1 for the first char we don't have
	# this formual is the same as typeracer.com's 5 keys / word
	# wikipedia says 6 is more accurate, I like typeracers flattery.
	# chars / 5 and seconds/60 simplifies to * 12
	echo -ne "$(echo "12 * $chars / $seconds" | bc)\t"
    done
}
wpm-game "$@"