dotfiles/.config/i3/blocks/iface

#!/bin/bash
# Copyright (C) 2014 Julien Bonjean <julien@bonjean.info>
# Copyright (C) 2014 Alexander Keller <github@nycroth.com>

# 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/>.

#------------------------------------------------------------------------

# Use the provided interface, otherwise the device used for the default route.
if [[ -n $BLOCK_INSTANCE ]]; then
    IF=$BLOCK_INSTANCE
else
    IF=$(ip route | awk '/^default/ { print $5 ; exit }')
fi

#------------------------------------------------------------------------

# As per #36 -- It is transparent: e.g. if the machine has no battery or wireless
# connection (think desktop), the corresponding block should not be displayed.
[[ ! -d /sys/class/net/${IF} ]] && exit

#------------------------------------------------------------------------

if [[ -z $IF ]] || [[ "$(cat /sys/class/net/$IF/operstate)" = 'down' ]]; then
    echo down # full text
    echo down # short text
    echo \#FF0000 # color
    exit
fi

case $1 in
    -4) AF=inet ;;
    -6) AF=inet6 ;;
    *) AF=inet6? ;;
esac

# if no interface is found, use the first device with a global scope
LOCIP=$(ip addr show $IF | perl -n -e "/$AF ([^\/]+).* scope global/ && print \$1 and exit")

#------------------------------------------------------------------------

case $BLOCK_BUTTON in
    1)  curl -s https://api.ipify.org;
        break;;
    2)  curl -s https://api.ipify.org | tee >(xclip -i);
        break;;
    0|3)  echo "$LOCIP" | tee >(xclip -i);
        break;;
    *)  echo "$LOCIP"
        break;;
esac