#!/bin/bash

CONFIG_BASE="${HOME}/.conkyrc_base"
CONFIG_NEW="${HOME}/.conkyrc_new"
CONFIG_REAL="${HOME}/.conkyrc"

IF_LIST=($(ip l \
  | egrep '^[0-9]+:\s+(eth|en|wl)' \
  | sed -r 's/^[0-9]+:\s+(\w+):.*/\1/' \
  | sort))

# Build new config from the default
rm "${CONFIG_NEW}"
cp "${CONFIG_BASE}" "${CONFIG_NEW}"

# Add interfaces to conkyrc_new
for i in "${IF_LIST[@]}"; do
  if [[ "${i:0:1}" == "e" ]]; then
    sed -i -r "s/#Network/Wired:\${alignr}\${addr $i}\n#Network/" "${CONFIG_NEW}"
  else
    sed -i -r "s/#Network/Wireless:\${alignr}\${addr $i}\n#Network/" "${CONFIG_NEW}"
  fi
done

# Replace config if there were changes
if ! diff -q "${CONFIG_NEW}" "${CONFIG_REAL}" >/dev/null 2>&1; then
  rm "${CONFIG_REAL}"
  cp "${CONFIG_NEW}" "${CONFIG_REAL}"
fi

# vim: sts=2 sw=2 ts=2