#!/bin/bash
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.

# CUPS backend of the Selkies queue: writes each job, a PDF by the time it
# gets here, into the print spool the device URI names (selkies:/path), under
# the job's title. Written under a temporary name and renamed once whole, so
# the spool watcher never sees a partial document.
set -e
if [ $# -eq 0 ]; then
    echo 'direct selkies "Unknown" "Selkies printer"'
    exit 0
fi
title="$3" file="${6:-}"
dir="${DEVICE_URI#selkies:}"
mkdir -p "${dir}"
name="$(printf '%s' "${title}" | tr -c 'A-Za-z0-9._ -' '_' | sed -E 's/^[._ ]+//; s/[. ]+$//' | cut -c1-120)"
name="${name%.pdf}"
name="${name%.PDF}"
name="${name:-document}"
target="${dir}/${name}.pdf"
n=2
while [ -e "${target}" ]; do
    target="${dir}/${name} (${n}).pdf"
    n=$((n + 1))
done
tmp="${dir}/.$1.part"
if [ -n "${file}" ]; then cat "${file}" > "${tmp}"; else cat > "${tmp}"; fi
mv -f "${tmp}" "${target}"