optional network traffic module

.local/bin/statusbar/nettraf

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+# Module showing network traffic. Shows how much data has been received (RX) or
+# transmitted (TX) since the previous time this script ran. So if run every
+# second, gives network traffic per second.
+
+case "$BLOCK_BUTTON" in
+	3) notify-send "🌐 Network traffic module" "🔻: Traffic received
+🔺: Traffic transmitted" ;;
+esac
+
+rxfile="${XDG_CACHE_HOME:-$HOME/.cache}/rxlog"
+txfile="${XDG_CACHE_HOME:-$HOME/.cache}/txlog"
+
+rxcurrent="$(cat /sys/class/net/*/statistics/rx_bytes | tr '\n' '+' | sed 's/+$/\n/' | bc)"
+txcurrent="$(cat /sys/class/net/*/statistics/tx_bytes | tr '\n' '+' | sed 's/+$/\n/' | bc)"
+
+printf "🔻%skB 🔺%skB\\n" \
+	"$(printf -- "(%s-%s)/1024\\n" "$rxcurrent" "$(cat "$rxfile")" | bc)" \
+	"$(printf -- "(%s-%s)/1024\\n" "$txcurrent" "$(cat "$txfile")" | bc)"
+
+# Log the current values for next run.
+echo "$rxcurrent" > "$rxfile"
+echo "$txcurrent" > "$txfile"