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#!/bin/sh
#
# printq - Watches a directory of print queues and submits files for printing
#
# Copyright (C) 2021 P. J. McDermott
#
# 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 2 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
set -eu
print_from_queue()
{
local dest="${1}"
local queue="${2}"
local file="${3}"
shift 3
local opt=
set -- -d "${dest}"
while read opt; do
set -- "${@}" -o "${opt}"
done 0<"${queue}/.options"
logger -t 'printq' "Printing ${queue}/${file}"
if ! out="$(lp "${@}" "${queue}/${file}" 2>&1)"; then
logger -t 'printq' "Failed to print: ${out}"
return 1
fi
rm -f "${queue}/${file}" || return 1
return 0
}
watch_queues()
{
local dir="${1}"
shift 1
local watched_filename=
local event_names=
local event_filename=
local dest=
logger -t 'printq' "Watching queues under ${dir}"
inotifywait -m -r -q -e close_write "${dir}" | \
while read -r watched_filename event_names event_filename; do
dest="${watched_filename#${dir}}"
while ! [ x"${dest}" = x"${dest#/}" ]; do
dest="${dest#/}"
done
dest="${dest%%/*}"
print_from_queue "${dest}" "${watched_filename}" \
"${event_filename}" || : # Don't exit on error.
done
# Shouldn't reach this point.
logger -t 'printq' 'Failed to watch queues'
return 1
}
usage()
{
printf 'Usage: %s <dir>\n' "${0}"
return 0
}
main()
{
local dir=
if [ ${#} -ne 1 ]; then
usage 1>&2
return 1
fi
dir="${1}"
shift 1
watch_queues "${dir}" || return 1
return 0
}
main "${@}"
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