switchkbl

#!/bin/bash

# Copyright 2013, Raphael Reitzig
#
# switchkbl 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.
#
# switchkbl 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 switchkbl. If not, see <http://www.gnu.org/licenses/>.

# This scripts allows to cycle through several
# keyboard layouts and provides visual feedback
# of success or failure. It is intended to be
# bound to a keyboard shortcut. If you want to
# change layouts by shell, you probably also
# want to change the method of feedback.

# Needs: setxkbmap, awk, libnotify-bin

# This is the list of available layouts. Note
# that entries have to come in triples.
# The first component of each triplet has to be a
# layout code that is understood by 'setxkbmap'.
# The second component has to be the layout's name
# as 'setxkbmap -print' prints it.
# The third component is a string printed in
# the notify box denoting the layout in human
# readable form.
# The fourth is the path to an image file that is
# also shown in the notify box. Leave it empty to
# have no image shown, but do not leave the element out!
# Note that tilde (~) expansion does not work.
# The first layout described will be considered
# default.
layouts=(
  "us altgr-intl" "us(altgr-intl)"  "USA"     "/home/raphael/.icons/flags/us.png"
  "se"            "se"              "Swedish" "/home/raphael/.icons/flags/se.png"
  "de"            "de"              "German"  "/home/raphael/.icons/flags/de.png"
);

# For error messages, another icon will be used
errimg="/home/raphael/.icons/error.png";

# Retrieve current keyboard layout. Returns
# something like 'de' or 'us'
current=`
  setxkbmap -print |
  grep xkb_symbols |
  awk '{print $4}' |
  awk -F"+" '{print $2}'`;

# If the current layout is not in the list,
# set the first one
next=0;

# Find the layout that comes after $current
for (( i = 0 ; i < (${#layouts[@]}/4) ; i++ )) do
  if [ $current = ${layouts[$i*4 + 1]} ]; then
    next=($i+1)%${#layouts[@]/4};
  fi
done

# Set the keyboard layout
return=`setxkbmap ${layouts[4*$next]} 2>&1`;

if [ ! "${1}" = "-s" ]; then
  if [ ${#return} -gt 0 ]; then
    # Notify user of error
    notify-send -i ${errimg}\
                     "Failed Setting Layout ${layouts[3*$next]}"\
                     "$return";
  # echo "Failed setting layout ${layouts[4*$next]}";
  else
    # Notify user of successful layout change
    notify-send -i ${layouts[4*$next + 3]}\
                     "Switched Keyboard Layout"\
                     "${layouts[4*$next + 2]}";
  # echo "Switched to keyboard layout ${layouts[4*$next]}"
  fi
fi

# Reconfigure customizations that might be set up
xmodmap "/home/raphael/.Xmodmap"
numlockx on