pdf

#!/bin/bash
#
# MUPDF Automation Script
# Make MUPDF remember current page when you quit
#
# Requires: xdotool, zenity
#
# Copyright © 2014, 2015 Mark Karpov
#
# MUPDF Automation Script 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.
#
# MUPDF Automation Script 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/>.

### constants

CACHE_DIR="$HOME/.cache/mupdf/"
DEFAULT_PAGE=1
PAGE_FILE="$CACHE_DIR/$(basename "$1").page"

### functions

bad_exit() # prints error message and exits the program
{
    echo "$(basename $0): ${1:-"Unknown Error"}"  1>&2
    exit 1
}

### main

# It's not recommended to use this automation script as root, because it
# would create files with page indexes in /root directory. That's not what
# you want. So we check if current user is root.

if test $(id -u) -eq 0
then
    bad_exit "Please run this program as ordinary user, not as root."
fi

# Now we need to create a directory where we will store our page indexes for
# various PDF files. This command will create such directory only if doesn't
# exist yet.

mkdir -p "$CACHE_DIR"

# OK, here we check if our script has been invoked with at least one command
# line argument.

if test $# -gt 0
then
    # Now we need to find out actual page number. If corresponding file
    # exists, we use number from the file. Otherwise we use default value:
    if test -f "$PAGE_FILE"
    then page=$(cat "$PAGE_FILE")
    else page=$DEFAULT_PAGE
    fi
    # It's time to launch MUPDF. We supply two arguments: name of file and
    # page number. We start application in background because we need to do
    # further manipulations here.
    mupdf "$1" $page &
    # We need to wait for the program's windows to appear and focus on it.
    xdotool search --sync --onlyvisible --class "mupdf"
    # Now we use xdotool to use fullscreen mode. Comment this line if you
    # don't want to use fullscreen mode automatically.
    xdotool key f
    # This command adjust scale so our document occupies full width.
    xdotool key W
    # Now we should wait until user decides to exit the program.
    wait
    # OK, this is the part where we ask for user's input with zenity.
    input=$(zenity --entry --title="page number" --text="page number:")
    # If user entered something and not canceled our query, we should
    # replace page number with this number.
    if test "$input" != ""
    then page=$input
    fi
    # Rewrite page number no matter what:
    echo $page > "$PAGE_FILE"
else
    bad_exit "Please supply filename as first argument."
fi