#!/usr/bin/env bash
# Outputs one of:
#   offline
#   wifi:<signal>%
#   eth:<ip>

# Check ethernet first
ETH=$(ip -o link show | awk '$9=="UP" && $2!="lo:" {print $2}' | grep -v "^wl" | head -1 | tr -d ':')
if [[ -n "$ETH" ]]; then
  IP=$(ip -4 addr show "$ETH" 2>/dev/null | awk '/inet /{print $2}' | cut -d/ -f1 | head -1)
  if [[ -n "$IP" ]]; then
    echo "eth:${IP}"
    exit 0
  fi
fi

# Check wifi
WIFI=$(ip -o link show | awk '$9=="UP" && $2~/^wl/ {print $2}' | tr -d ':' | head -1)
if [[ -n "$WIFI" ]]; then
  SIGNAL=$(awk "/${WIFI}/{print int(\$3*100/70)}" /proc/net/wireless 2>/dev/null | head -1)
  [[ -z "$SIGNAL" ]] && SIGNAL="?"
  echo "wifi:${SIGNAL}%"
  exit 0
fi

echo "offline"