2019-10-05 14:02:23 +00:00
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#!/bin/sh
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# shellcheck disable=SC2016,SC2059
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KEYBOARD_ID="Corsair Corsair STRAFE Gaming Keyboard"
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# cpm: characters per minute
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# wpm: words per minute (1 word = 5 characters)
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METRIC=wpm
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2019-10-11 13:39:15 +00:00
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FORMAT=" %d $METRIC"
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2019-10-05 14:02:23 +00:00
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INTERVAL=2
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# If you have a keyboard layout that is not listed here yet, create a condition
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# yourself. $3 is the key index. Use `xinput test "AT Translated Set 2 keyboard"`
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# to see key codes in real time. Be sure to open a pull request for your
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# layout's condition!
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LAYOUT=qwerty
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case "$LAYOUT" in
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qwerty) CONDITION='($3 >= 10 && $3 <= 19) || ($3 >= 24 && $3 <= 33) || ($3 >= 37 && $3 <= 53) || ($3 >= 52 && $3 <= 58)'; ;;
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azerty) CONDITION='($3 >= 10 && $3 <= 19) || ($3 >= 24 && $3 <= 33) || ($3 >= 37 && $3 <= 54) || ($3 >= 52 && $3 <= 57)'; ;;
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qwertz) CONDITION='($3 >= 10 && $3 <= 20) || ($3 >= 24 && $3 <= 34) || ($3 == 36) || ($3 >= 38 && $3 <= 48) || ($3 >= 52 && $3 <= 58)'; ;;
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dontcare) CONDITION='1'; ;; # Just register all key presses, not only letters and numbers
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*) echo "Unsupported layout \"$LAYOUT\""; exit 1; ;;
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esac
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# We have to account for the fact we're not listening a whole minute
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multiply_by=60
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divide_by=$INTERVAL
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case "$METRIC" in
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wpm) divide_by=$((divide_by * 5)); ;;
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cpm) ;;
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*) echo "Unsupported metric \"$METRIC\""; exit 1; ;;
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esac
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hackspeed_cache="$(mktemp -p '' hackspeed_cache.XXXXX)"
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trap 'rm "$hackspeed_cache"' EXIT
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# Write a dot to our cache for each key press
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printf '' > "$hackspeed_cache"
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xinput test "$KEYBOARD_ID" | \
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stdbuf -o0 awk '$1 == "key" && $2 == "press" && ('"$CONDITION"') {printf "."}' >> "$hackspeed_cache" &
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while true; do
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# Ask the kernel how big the file is with the command `stat`. The number we
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# get is the file size in bytes, which equals the amount of dots the file
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# contains, and hence how much keys were pressed since the file was last
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# cleared.
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lines=$(stat --format %s "$hackspeed_cache")
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# Truncate the cache file so that in the next iteration, we count only new
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# keypresses
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printf '' > "$hackspeed_cache"
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# The shell only does integer operations, so make sure to first multiply and
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# then divide
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value=$((lines * multiply_by / divide_by))
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printf "$FORMAT\\n" "$value"
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sleep $INTERVAL
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done
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