1 files changed, 64 insertions, 0 deletions
diff --git a/polybar/scripts/net-speed.sh b/polybar/scripts/net-speed.sh
new file mode 100755
index 0000000..ead10fd
--- /dev/null
+++ b/polybar/scripts/net-speed.sh
@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+iface="${POLYBAR_NETWORK:-eth0}"
+state_dir="${XDG_RUNTIME_DIR:-/tmp}"
+if [ ! -w "$state_dir" ]; then
+  state_dir="${XDG_CACHE_HOME:-$HOME/.cache}"
+  mkdir -p "$state_dir"
+fi
+if [ ! -w "$state_dir" ]; then
+  state_dir="/tmp"
+fi
+state_file="$state_dir/polybar-net-${iface}.state"
+rx_file="/sys/class/net/$iface/statistics/rx_bytes"
+tx_file="/sys/class/net/$iface/statistics/tx_bytes"
+
+human() {
+  local bytes="$1"
+
+  if [ "$bytes" -ge 1048576 ]; then
+    awk -v v="$bytes" 'BEGIN { printf "%.1fM", v / 1048576 }'
+  elif [ "$bytes" -ge 1024 ]; then
+    awk -v v="$bytes" 'BEGIN { printf "%.0fK", v / 1024 }'
+  else
+    printf '%sB' "$bytes"
+  fi
+}
+
+if [ ! -r "$rx_file" ] || [ ! -r "$tx_file" ]; then
+  echo "n/a"
+  exit 0
+fi
+
+now="$(date +%s)"
+rx="$(cat "$rx_file")"
+tx="$(cat "$tx_file")"
+
+if [ -r "$state_file" ]; then
+  read -r old_now old_rx old_tx <"$state_file" || true
+else
+  old_now="$now"
+  old_rx="$rx"
+  old_tx="$tx"
+fi
+
+printf '%s %s %s\n' "$now" "$rx" "$tx" >"$state_file"
+
+delta=$((now - old_now))
+if [ "$delta" -le 0 ]; then
+  delta=1
+fi
+
+down=$(((rx - old_rx) / delta))
+up=$(((tx - old_tx) / delta))
+
+if [ "$down" -lt 0 ]; then
+  down=0
+fi
+
+if [ "$up" -lt 0 ]; then
+  up=0
+fi
+
+printf '%s/%s\n' "$(human "$down")" "$(human "$up")"