diff -r dc5c210295d0 -r f466b4c7d9b1 streamlet-examples/__relpipe_in_filesystem_script_hash
--- a/streamlet-examples/__relpipe_in_filesystem_script_hash	Sat Jan 18 16:41:59 2020 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,75 +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 computes hashes of given files.
-# Default algorithm is sha256.
-#
-# Any supported hash algorithm can be specified by e.g. --option "attribute" "sha512"
-# The hash command is derived from the algorithm name by adding "sum" suffix and must be available at $PATH.
-#
-# Multiple algorithms can be specified (just repeat the --option).
-# But single streamlet instance will run them sequentially.
-# When parallell processing is needed (usually faster) then multiple scriptlet instances should be used:
-#   --scriptlet hash --option "sha1" --as "sha1" --scriptlet hash --option "sha256" --as "sha256"
-# instead of:
-#   --scriptlet hash --option "sha1" --as "sha1" --option "sha256" --as "sha256"
-
-
-. "$(dirname $0)/streamlet-common.sh"
-
-processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES_METADATA() {
-	hashTypes=()
-	hashCommands=()
-
-	for (( i=0; i<${#optionNames[@]}; i++)); do
-		if [[ "x${optionNames[$i]}" == "xattribute" ]]; then
-			if type "${optionValues[$i]}sum" > /dev/null; then
-				hashTypes+=("${optionValues[$i]}");
-				hashCommands+=("${optionValues[$i]}sum");
-			else
-				echo "Unsupported attribute: ${optionValues[$i]}" >&2
-			fi
-		else
-			echo "Unsupported option: ${optionNames[$i]}" >&2
-		fi
-	done
-
-	if [[ -z "$hashTypes" ]]; then
-		hashTypes=("sha256")
-		hashCommands=("sha256sum")
-	fi
-
-	for (( i=0; i<${#hashTypes[@]}; i++)); do
-		send OUTPUT_ATTRIBUTE_METADATA "${outputAttributeAliases[$i]-${hashTypes[$i]}}"    "string"
-	done
-
-	send WAITING_FOR_INPUT_ATTRIBUTES
-}
-
-processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES() {
-	for (( i=0; i<${#hashTypes[@]}; i++)); do
-		value=$("${hashCommands[$i]}" "$currentFile" | cut -d" " -f1) 2>/dev/null;
-		if [[ -z "$value" ]]; then isNull="true"; else isNull="false"; fi
-		send OUTPUT_ATTRIBUTE "$value"    "$isNull";
-	done
-	
-	send WAITING_FOR_INPUT_ATTRIBUTES;
-}
-
-initialize
-processMessages