Dotfiles/polybar/scripts/cpm.sh
2023-02-03 19:12:16 +01:00

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#!/bin/sh
# shellcheck disable=SC2016,SC2059
KEYBOARD_ID="Cooler Master Technology Inc. SK650"
# cpm: characters per minute
# wpm: words per minute (1 word = 5 characters)
METRIC=cpm
FORMAT=" %d$METRIC"
INTERVAL=2,5
# If you have a keyboard layout that is not listed here yet, create a condition
# yourself. $3 is the key index. Use `xinput test "AT Translated Set 2 keyboard"`
# to see key codes in real time. Be sure to open a pull request for your
# layout's condition!
LAYOUT=qwerty
case "$LAYOUT" in
qwerty) CONDITION='($3 >= 10 && $3 <= 19) || ($3 >= 24 && $3 <= 33) || ($3 >= 37 && $3 <= 53) || ($3 >= 52 && $3 <= 58)'; ;;
azerty) CONDITION='($3 >= 10 && $3 <= 19) || ($3 >= 24 && $3 <= 33) || ($3 >= 37 && $3 <= 54) || ($3 >= 52 && $3 <= 57)'; ;;
qwertz) CONDITION='($3 >= 10 && $3 <= 20) || ($3 >= 24 && $3 <= 34) || ($3 == 36) || ($3 >= 38 && $3 <= 48) || ($3 >= 52 && $3 <= 58)'; ;;
dvorak) CONDITION='($3 >= 10 && $3 <= 19) || ($3 >= 27 && $3 <= 33) || ($3 >= 38 && $3 <= 47) || ($3 >= 53 && $3 <= 61)'; ;;
dontcare) CONDITION='1'; ;; # Just register all key presses, not only letters and numbers
*) echo "Unsupported layout \"$LAYOUT\""; exit 1; ;;
esac
# We have to account for the fact we're not listening a whole minute
multiply_by=60
divide_by=$INTERVAL
case "$METRIC" in
wpm) divide_by=$((divide_by * 5)); ;;
cpm) ;;
*) echo "Unsupported metric \"$METRIC\""; exit 1; ;;
esac
hackspeed_cache="$(mktemp -p '' hackspeed_cache.XXXXX)"
trap 'rm "$hackspeed_cache"' EXIT
# Write a dot to our cache for each key press
printf '' > "$hackspeed_cache"
xinput test "$KEYBOARD_ID" | \
stdbuf -o0 awk '$1 == "key" && $2 == "press" && ('"$CONDITION"') {printf "."}' >> "$hackspeed_cache" &
while true; do
# Ask the kernel how big the file is with the command `stat`. The number we
# get is the file size in bytes, which equals the amount of dots the file
# contains, and hence how much keys were pressed since the file was last
# cleared.
lines=$(stat --format %s "$hackspeed_cache")
# Truncate the cache file so that in the next iteration, we count only new
# keypresses
printf '' > "$hackspeed_cache"
# The shell only does integer operations, so make sure to first multiply and
# then divide
value=$((lines * multiply_by / divide_by))
printf "$FORMAT\\n" "$value"
sleep $INTERVAL
done