streamlet-examples/pdfinfo
author František Kučera <franta-hg@frantovo.cz>
Fri, 13 May 2022 21:35:30 +0200
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permissions -rwxr-xr-x
portable order of (i++) parameters
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#!/bin/bash
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# Relational pipes
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# Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, version 3 of the License.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This streamlet provides PDF metadata of given files. It calls the tool pdfinfo.
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# With no options it returns just number of pages (or 0 if the file is not a PDF).
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# Specific attributes can be selected using options – e.g. --option 'attribute' 'Author'
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# List of available attributes can be obtained by directly calling the pdfinfo command on a PDF file.
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. "$(dirname "$(realpath "$0")")/streamlet-common.sh"
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processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES_METADATA() {
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	pdfFields=()
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	for (( i=0; i<${#optionNames[@]}; i++)); do
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		if [[ "x${optionNames[$i]}" == "xattribute" ]]; then
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			pdfFields+=("${optionValues[$i]}");
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		elif [[ "x${optionNames[$i]}" == "xprefix" ]]; then
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			pdfPrefix="${optionValues[$i]}";
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		else
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			echo "Unsupported option: ${optionNames[$i]}" >&2
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		fi
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	done
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	if [[ -z "$pdfFields" ]]; then
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		pdfFields=( "Pages" );
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	fi
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	for (( i=0; i<${#pdfFields[@]}; i++)); do
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		if [[ "x${pdfFields[$i]}" == "xPages" ]]; then local type="integer"; else local type="string"; fi
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		send OUTPUT_ATTRIBUTE_METADATA "${outputAttributeAliases[$i]-$pdfPrefix${pdfFields[$i]}}"    "$type"
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	done
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	send WAITING_FOR_INPUT_ATTRIBUTES
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}
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processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES() {
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	local pdfInfo pdfValid value isNull;
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	[[ -d "$currentFile" ]] || pdfInfo="$(pdfinfo -isodates "$currentFile")";
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	pdfValid="$?";
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	for (( i=0; i<${#pdfFields[@]}; i++)); do
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		value="$(echo "$pdfInfo" | grep -P "^\Q${pdfFields[$i]}\E:" | sed -E 's/[^:]+:\s+(.*)/\1/g' | tr -d '\n';)"; # the field name must not contain "\E"
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		if [[ ! "x$pdfValid" == "x0" ]] || [[ "x$value" == "x" ]]; then isNull="true";
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		else                                                            isNull="false";
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		fi
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		send OUTPUT_ATTRIBUTE "$value"    "$isNull";
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	done
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	send WAITING_FOR_INPUT_ATTRIBUTES;
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}
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initialize
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processMessages