#!/bin/bash

# tethered.sh - Tethered shooting script for Nikon DSLRs and gphoto2
# based upon the test-hook.sh script by Hans Ulrich Niedermann.
# Written by Juan Julio Peña AKA Apollux
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

# Finds out the script's own file name.
SCRIPT_NAME=`basename $0`
# The name of the file been downloaded from the camera, as passed by gphoto2
FILE_NAME=$ARGUMENT

case "$ACTION" in
    init)
    # Nothing happends here, gphoto2 has initiated operations
    # exit 1 # decomment this line to cause a non-null exit, thus making the gphoto2 call fail immediately
    ;;
    start)
    # gphoto2 started processing it's command line. In other words, nothing happends here.
    ;;
    download)
    #The picture(s) has been downloaded from the camera, time to take action.
    echo "$FILE_NAME was succesfuly downloaded!"


    # This uses a bash parameter-expansion trick to get the last 3 characters of the FILE_NAME variable.
    LENGHT_OF_NAME=${#FILE_NAME}
    FILE_EXTENSION=${FILE_NAME:(($LENGH_OF_NAME-3)):3}

    # Let's see what type of file was downloaded from the camera.
    case "$FILE_EXTENSION" in
        (NEF)
            # The file is a RAW image, so nothing is done. Do you really want to proccess a RAW file in real time?
            echo "RAW (.NEF) file detected, skipped"
            ;;
        (JPG)
            # The file is a JPEG image, so let's display it on all it's glory.
            # First, kills any previously open viewer window, to save on RAM memory.
            pkill gwenview
            # Now, use the gwenview viewer to show the file on full screen mode
            gwenview -f $FILE_NAME &
            ;;
        (*)
            # The downloaded file isn't a NEF nor a JPG, what is your camera producing?
            echo "An unknown file tipe was downloaded from the camera, better check your settings!"
            ;;
    esac

    ;;
    stop)
    date
    ;;
    *)
    echo "Unknown action: $ACTION"
    ;;
esac

# Operation has been successful.
exit 0