10

I have a shell script that takes a PDF file as an argument and prints it with additional printer specific options. How can I add this script as a virtual printer that can be selected from the GUI?

The shell script is a manual duplex script that takes a PDF file, prints even pages, gives a user prompt using zenity asking the user to flip the pages and then prints the odd pages.

My current workflow is:

  1. File -> Print -> Save to file -> tmp.pdf
  2. my_duplex_script tmp.pdf
  3. rm tmp.pdf

Is there any way to make it as :

  1. File -> Print -> my_script_as_virtual_printer

Note: This is on Linux mint 13 cinnamon. I have tried gnome-manual-duplex but it doesn't work for me.


The GUI dialog from which I can print to a PDF file Standard GTK print dialog

my_duplex_script

#!/bin/bash

lp_args=
while getopts o: opt
do
    case "$opt" in
        o)  lp_args="$lp_args -o $OPTARG" ;;
        \?) echo >&2 Invalid argument; exit 1 ;;
    esac
done
shift `expr $OPTIND - 1`

file=$1
page_count=$(pdfinfo "$file" | grep Pages | awk '{print $2}')
is_odd=`expr $page_count % 2`

if [ $is_odd -eq 1 ]
then
    #outputting blank
    echo | lp -s -t "$file"-blank
fi

#printing even reversed
lp -s -o page-set=even -o outputorder=reverse $lp_args -t "$file"-even "$file"

if zenity --question --text="Flip and reinsert the entire stack when printing has finished." --ok-label="Proceed" --cancel-label="Cancel"
then
    #printing odd reversed
    lp -s -o page-set=odd -o outputorder=reverse $lp_args -t "$file"-odd "$file"
else
    echo >&2 User abort
    exit 1
fi

exit 0
2

I've never tried this but there is a tool called tea4cups which sounds like you could implement a prehook to your script which would do the printing. You could then have this print cancel out and not actually go to a real printer via cups, allowing your script to do the printing instead.

excerpt

The possibilities are endless :

  • Send the same job to several printers at the same time, which is not possible with CUPS.
  • Automate the PDF archiving of all print jobs.
  • Forbid duplicate print jobs (a simple example is shown in the sample configuration file)
  • Create a print accounting solution in 15 minutes ( YES, THIS IS FOR REAL )
  • etc...

Tea4cups provides the following facilitates:

Tea4CUPS provides three ways to launch commands :

  • filters : A filter can modify the input datas before they are sent to the printer or made available to the pre and post hooks defined below. Currently a single filter can be defined per print queue.
  • prehooks : these are guaranteed to be launched before the print job is sent to the real printer. Any prehook which exits -1 can cancel the print job. Any number of prehooks can be defined for a particular print queue.
  • posthooks : these are guaranteed to be launched after the print job has been sent to the real printer, unless the job was previously cancelled by a prehook. Any number of posthooks can be defined for a particular print queue.
1

How can I add this script as a virtual printer that can be selected from the GUI?

To ad a virtual printer, just edit your /etc/printcap. This is not very easy, because the syntax of PRINTCAP need getting used to.

An example how to do it is showed here PDF Service with Samba:

# /etc/printcap
# PDF Service entry

lp|pdf|PDF Printer:\
        :lp=/dev/null:sh:\
        :sd=/var/spool/lpd/pdf:\
        :af=/var/spool/lpd/pdf/acct:\
        :mx#0:sh:\
        :if=/usr/bin/smbprint:

Here the /usr/bin/smbprint script is used as a print filter. The printer itself is /dev/null.

Perhaps you'll need to install cups-bsd, but its often the default config.

  • Note that printcap is the configuration file for BSD lpr or lprNG, not for CUPS which is the de facto standard nowadays, and is the standard on Mint. – Gilles 'SO- stop being evil' Jun 14 '14 at 23:20
  • Therefore I mentioned the cups-bsd package, which is also available on Mint, by default installed and also well supported. cups-bsd is not lprng! It is only a wrapper, that provides the functionality of BSD printing for Cups in order to support applications which use lpr for printing (i.e. xpdf). – user55518 Jun 15 '14 at 12:56
0

Late to the party, but I wanted to do the same thing and I did not find any other solution.

I'll write here how i solved it , maybe others will find the solution useful.

  • made a filter for cups to catch the file to be printed
  • made a backend to print the file
  • made a nice and easy installer.

source code is on github: https://github.com/dentys03/manual_duplex_linux

It should work on any HP printer. Easily adapted for other printers, i guess.

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