#!/bin/sh
#
# Displays wireless signal strength for the given interface
#
# Copyright (C) 2013 Mike Gerwitz
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
##

iface="$1"

iwconfig "$iface" \
  | grep -o 'Link Quality=[^ ]\+' \
  | cut -d'=' -f2 \
  | awk -F/ '
    {
      quality = ($1 / $2 * 100);
      color   = ".";

      if ( quality >= 75 )
        color = "g";
      else if ( quality >= 50 )
        color = "y";
      else if ( quality < 25 )
      {
        color = "r";
      }

      printf "\005{+ .m}%s:\005{-}\005{+ .%c}%d%%\005{-}", \
        "'$1'", color, quality;
    }
  '