--- a/streamlet-examples/__relpipe_in_filesystem_script_exiftool	Sat Jan 18 16:41:59 2020 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,84 +0,0 @@
-#!/bin/bash
-
-# Relational pipes
-# Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info)
-#
-# 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, version 3 of the License.
-#
-# 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, see <http://www.gnu.org/licenses/>.
-
-
-# This streamlet provides various file metadata like EXIF or PDF. It calls the tool exiftool.
-# With no options it returns "File:MIMEType" and "exiftool_xml" attributes.
-# Specific attributes can be selected using options – e.g. --option 'attribute' '…'
-# List of available attributes can be obtained by directly calling the "exiftool -X" command on given file or from the "available_attributes" attribute.
-# Two additional attributes are provided by this streamlet:
-#  - "exiftool_xml" – all attributes provided by exiftool in form of XML
-#  - "available_attributes" – list of available attributes (each file may have different) separated by line-breaks (TODO: return as an array of strings, when this data type is implemented)
-
-
-. "$(dirname $0)/streamlet-common.sh"
-
-processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES_METADATA() {
-	streamletFields=()
-
-	for (( i=0; i<${#optionNames[@]}; i++)); do
-		if [[ "x${optionNames[$i]}" == "xattribute" ]]; then
-			streamletFields+=("${optionValues[$i]}");
-		elif [[ "x${optionNames[$i]}" == "xprefix" ]]; then
-			pdfPrefix="${optionValues[$i]}";
-		else
-			echo "Unsupported option: ${optionNames[$i]}" >&2
-		fi
-	done
-
-	if [[ -z "$streamletFields" ]]; then
-		streamletFields=( "File:MIMEType" "exiftool_xml" );
-	fi
-
-	for (( i=0; i<${#streamletFields[@]}; i++)); do
-		# TODO: data type mappings (integers, booleans)
-		send OUTPUT_ATTRIBUTE_METADATA "${outputAttributeAliases[$i]-$pdfPrefix${streamletFields[$i]}}"    "string"
-	done
-
-	send WAITING_FOR_INPUT_ATTRIBUTES
-}
-
-processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES() {
-	local streamletInfo streamletValid value isNull;
-
-	[[ -d "$currentFile" ]] || streamletInfo="$(exiftool -X "$currentFile")";
-	streamletValid="$?";
-
-	for (( i=0; i<${#streamletFields[@]}; i++)); do
-		if   [[ "x${streamletFields[$i]}" == "xexiftool_xml"  ]]; then value="$streamletInfo";
-		elif [[ "x${streamletFields[$i]}" == "xavailable_attributes"  ]]; then
-			value=$'available_attributes\nexiftool_xml\n'"$(echo "$streamletInfo" | relpipe-in-xmltable --relation exif --records '/*/*/*' --attribute 'name' string 'name()' | relpipe-out-nullbyte | tr \\0 \\n)";
-		else
-			value="$(echo "$streamletInfo" | relpipe-in-xmltable --relation exif --records "/*/*/*[name() = '${streamletFields[$i]}']" --attribute 'value' string '.' | relpipe-out-nullbyte | tr -d \\0)";
-			# TODO: parse the XML only once
-			# TODO: validate parameter or use parametrized XPath
-			# TODO: use real namespaces
-		fi
-
-		# n.b. for some files exiftools returns exit code, however it provides some basic properties like file timestamps and <ExifTool:Error>Unknown file type</ExifTool:Error> which is also valid XML and might be useful
-		if   [[ ! "x$streamletValid" == "x0" ]] && [[ "x$value" == "x" ]]; then value="";  isNull="true";
-		else                                                                               isNull="false";
-		fi
-
-		send OUTPUT_ATTRIBUTE "$value"    "$isNull";
-	done
-	
-	send WAITING_FOR_INPUT_ATTRIBUTES;
-}
-
-initialize
-processMessages