--- a/src/ExecAttributeFinder.h	Sat Jan 11 00:58:35 2020 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,139 +0,0 @@
-/**
- * Relational pipes
- * Copyright © 2019 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/>.
- */
-#pragma once
-
-#include <vector>
-#include <filesystem>
-#include <regex>
-#include <memory>
-
-#include <relpipe/writer/typedefs.h>
-#include <relpipe/writer/AttributeMetadata.h>
-#include <relpipe/writer/RelationalWriter.h>
-
-#include "RequestedField.h"
-#include "SubProcess.h"
-#include "AttributeFinder.h"
-#include "ExecMsg.h"
-
-namespace relpipe {
-namespace in {
-namespace filesystem {
-
-namespace fs = std::filesystem;
-using namespace relpipe::writer;
-
-class ExecAttributeFinder : public AttributeFinder {
-private:
-	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
-	std::map<int, std::shared_ptr<SubProcess>> subProcesses;
-	std::map<int, std::vector<AttributeMetadata>> cachedMetadata;
-
-	string_t getExecCommand(const RequestedField& field) {
-		// TODO: move to another directory, exec, not script + use custom $PATH with no prefix
-		return SCRIPT_PREFIX + field.name;
-	}
-
-protected:
-
-	virtual void writeFieldOfExistingFile(RelationalWriter* writer, const RequestedField& field) override {
-		// TODO: paralelize also over records → fork multiple processes and distribute records across them; then collect results (with a lock)
-		if (field.group == RequestedField::GROUP_EXEC) {
-
-			subProcesses[field.id]->write({ExecMsg::INPUT_ATTRIBUTE, L"0", convertor.from_bytes(currentFileRaw), L"false"}); // index, value, isNull
-			subProcesses[field.id]->write({ExecMsg::WAITING_FOR_OUTPUT_ATTRIBUTES});
-
-			for (auto metadata : cachedMetadata[field.id]) {
-				SubProcess::Message m = subProcesses[field.id]->read();
-				if (m.code == ExecMsg::OUTPUT_ATTRIBUTE) writer->writeAttribute(m.parameters[0]);
-				else throw RelpipeWriterException(L"Protocol violation from exec sub-process while reading: „" + metadata.attributeName + L"“. Expected OUTPUT_ATTRIBUTE but got: " + m.toString());
-			}
-
-			SubProcess::Message m = subProcesses[field.id]->read();
-			if (m.code != ExecMsg::WAITING_FOR_INPUT_ATTRIBUTES) throw RelpipeWriterException(L"Protocol violation from exec sub-process. Expected WAITING_FOR_INPUT_ATTRIBUTES but got: " + m.toString());
-			// TODO: generic protocol violation error messages / method for checking responses
-		}
-	}
-
-public:
-
-	static const string_t SCRIPT_PREFIX;
-
-	virtual vector<AttributeMetadata> toMetadata(RelationalWriter* writer, const RequestedField& field) override {
-		if (field.group == RequestedField::GROUP_EXEC) {
-
-			if (cachedMetadata.count(field.id)) {
-				return cachedMetadata[field.id];
-			} else {
-
-				std::vector<string_t> commandLine = {getExecCommand(field)};
-				std::map<string_t, string_t> environment;
-
-				for (auto mn : ExecMsg::getMessageNames()) {
-					environment[L"EXEC_MSG_" + mn.second] = std::to_wstring(mn.first);
-					environment[L"EXEC_MSG_" + std::to_wstring(mn.first)] = mn.second;
-				}
-
-				shared_ptr<SubProcess> subProcess(SubProcess::create(commandLine, environment, false));
-				subProcesses[field.id] = subProcess;
-
-				string_t version = L"1";
-				subProcess->write({ExecMsg::VERSION_SUPPORTED, version});
-				subProcess->write({ExecMsg::WAITING_FOR_VERSION});
-				SubProcess::Message versionMessage = subProcess->read();
-				if (versionMessage.code == ExecMsg::VERSION_ACCEPTED && versionMessage.parameters[0] == version) {
-					subProcess->write({ExecMsg::RELATION_START});
-					subProcess->write({ExecMsg::INPUT_ATTRIBUTE_METADATA, L"path", L"string"});
-					for (string_t alias : field.getAliases()) subProcess->write({ExecMsg::OUTPUT_ATTRIBUTE_ALIAS, alias});
-					for (int i = 0; i < field.options.size();) subProcess->write({ExecMsg::OPTION, field.options[i++], field.options[i++]});
-					subProcess->write({ExecMsg::WAITING_FOR_OUTPUT_ATTRIBUTES_METADATA});
-
-					vector<AttributeMetadata> metadata;
-					while (true) {
-						SubProcess::Message m = subProcess->read();
-						if (m.code == ExecMsg::OUTPUT_ATTRIBUTE_METADATA) metadata.push_back({m.parameters[0], writer->toTypeId(m.parameters[1])});
-						else if (m.code == ExecMsg::WAITING_FOR_INPUT_ATTRIBUTES) break;
-					}
-
-					cachedMetadata[field.id] = metadata;
-					return metadata;
-				} else {
-					throw RelpipeWriterException(L"Incompatible exec sub-process version or message: " + versionMessage.toString());
-				}
-			}
-		} else {
-			return {};
-		}
-	}
-
-	virtual ~ExecAttributeFinder() override {
-		for (auto s : subProcesses) {
-			try {
-				s.second->write({ExecMsg::RELATION_END});
-				s.second->wait();
-			} catch (...) {
-				std::wcerr << L"Exception caught during closing sub-process #" + std::to_wstring(s.first) + L" and waiting for its end." << std::endl;
-			}
-		}
-	}
-};
-
-const relpipe::writer::string_t ExecAttributeFinder::SCRIPT_PREFIX = L"__relpipe_in_filesystem_script_";
-
-}
-}
-}