#!/bin/bash

########################################################################
# 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/>.
########################################################################

# Copyright (C) 2013 Mithat Konar <http://mithatkonar.com>

# DESTRUCTIVELY (but non-recursively) convert all files in the working
# directory ending in ".svg" to pdf format.

# Requires inkscape, zenity.

EXT_IN=.svg
EXT_OUT=.pdf
OPTIONS=""

SCRIPTNAME="$(basename $0)"

# Make list of files to be processed.
FILES=$(ls -1 *${EXT_IN} 2>/dev/null) || { zenity --title "$SCRIPTNAME" --warning --text "<b>Nothing to convert!</b>

No *${EXT_IN} files found."; exit 1; }

# Get confirmation from user to continue.
zenity --title "$SCRIPTNAME" \
  --question \
  --text "<b>Desctructively convert the following to PDF?</b>

$FILES" || exit 1

# Make a temp file to store batch commands.
CMDFILE=$(mktemp) || { zenity --title "$SCRIPTNAME" --error --text "Error: Could not create temp file."; exit 1; }

# Build up the list of commands in temp file.
for file in $FILES
do
    base=$(basename $file ${EXT_IN})
    echo "${file} --export-pdf=${base}${EXT_OUT}" >> $CMDFILE
done

# Process commands in a batch.
(DISPLAY= inkscape ${OPTIONS} --shell < $CMDFILE
rm -f $CMDFILE) | zenity --title="$SCRIPTNAME" \
  --progress --pulsate --auto-close --auto-kill \
  --text="Processing files ..."

# Delete old files.
# Since inkscape exits with 0 even with errors, we need to explicitly check
# for conversion before deleting originals.
not_deleted=""
for file in $FILES
do
    base=$(basename $file ${EXT_IN})
    if [[ -f ${base}${EXT_OUT} ]]; then
        rm $file
    else
        not_deleted="$not_deleted
$file"
    fi
done

if [[ "x$not_deleted" != "x" ]] ; then
    zenity --title "$SCRIPTNAME" \
      --error \
      --text "<b>The following files were not deleted:</b>
$not_deleted"
    exit 1
fi