Add a module I forked from polybar-scripts

I rewrote the info-hackspeed script. It should be a tad more energy
efficient now (just laptop things), you can also choose between cpm and
wpm, and the file is stored in RAM (in /tmp) instead of on disk.

polybar/config.ini

@@ -390,6 +390,11 @@ menu-2-0-exec = sudo poweroff
 menu-2-1 = cancel
 menu-2-1-exec = menu-open-0
 
+[module/info-hackspeed]
+type = custom/script
+exec = ~/.config/polybar/info-hackspeed.sh
+tail = true
+
 [settings]
 screenchange-reload = true
 ;compositing-background = xor

polybar/info-hackspeed.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+# Only count keys that satisfy this condition. $3 is the key index
+# Use `xinput test "AT Translated Set 2 keyboard"` to find out key indices
+CONDITION='($3 >= 24 && $3 <= 33) || ($3 >= 37 && $3 <= 54) || ($3 >= 52 && $3 <= 57)'
+
+# cpm: characters per minute
+# wpm: words per minute (1 word = 5 characters)
+METRIC=wpm
+
+FORMAT="  %d $METRIC\n"
+
+
+case "$METRIC" in
+	wpm) factor=3; ;;
+	cpm) factor=1; ;;
+	*) 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 "AT Translated Set 2 keyboard" | \
+	stdbuf -o0 awk '$1 == "key" && $2 == "press" && ('"$CONDITION"') {printf "."}' >> "$hackspeed_cache" &
+
+while true; do
+	lines=$(stat --format %s "$hackspeed_cache")
+	value=$(($lines * $factor / 5))
+
+	printf '' > "$hackspeed_cache"
+	printf "$FORMAT" "$value"
+
+	sleep 20
+done