--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/StdInCommand.h	Sun Dec 09 18:33:20 2018 +0100
@@ -0,0 +1,118 @@
+/**
+ * Relational pipes
+ * Copyright © 2018 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 <cstdlib>
+#include <iostream>
+#include <string>
+#include <vector>
+#include <algorithm>
+#include <string>
+#include <locale>
+
+#include <relpipe/writer/typedefs.h>
+#include <relpipe/writer/AttributeMetadata.h>
+#include <relpipe/cli/CLI.h>
+#include <relpipe/cli/RelpipeCLIException.h>
+
+#include "Command.h"
+
+namespace relpipe {
+namespace in {
+namespace cli {
+
+/**
+ * TODO: consider code merge with ArgumentsCommand
+ */
+class StdInCommand : public Command {
+private:
+	relpipe::writer::boolean_t readStdIn;
+	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
+
+	/**
+	 * Reads next value from arguments and (if no arguments left) from input
+	 * @param input
+	 * @param arguments
+	 * @param i current index in the arguments vector
+	 * @param required if true, exception is thrown when no data found
+	 * @return 
+	 */
+	relpipe::writer::string_t readNext(std::istream& input, const std::vector<relpipe::writer::string_t>& arguments, size_t& i, relpipe::writer::boolean_t required) {
+		using namespace relpipe::writer;
+		using namespace relpipe::cli;
+
+		if (i < arguments.size()) {
+			return arguments[i++];
+		} else if (readStdIn) {
+			std::stringstream value;
+
+			while (true) {
+				char ch;
+				input.get(ch);
+				if (ch == 0 || input.eof() || input.fail()) break;
+				else value << ch;
+			}
+
+			if (required && value.str().empty()) throw RelpipeCLIException(L"Missing value on STDIN.", CLI::EXIT_CODE_BAD_SYNTAX);
+
+			return convertor.from_bytes(value.str());
+		} else {
+			if (required) throw RelpipeCLIException(L"Missing value on CLI.", CLI::EXIT_CODE_BAD_SYNTAX);
+			return L"";
+		}
+	}
+
+
+public:
+
+	StdInCommand(relpipe::writer::boolean_t readStdIn) :
+	readStdIn(readStdIn) {
+	}
+
+	void process(std::istream& input, std::ostream& output, const relpipe::writer::string_t& command, const std::vector<relpipe::writer::string_t>& arguments) override {
+		using namespace relpipe::writer;
+
+		size_t i = 0;
+		string_t relationName = readNext(input, arguments, i, true);
+		integer_t attributeCount = std::stoul(readNext(input, arguments, i, true)); // TODO: use integer data type's method?
+		boolean_t writeHeader = true; // TODO: add option for header omitting
+
+		std::shared_ptr<RelationalWriter> writer(Factory::create(output));
+
+		std::vector<AttributeMetadata> attributes(attributeCount);
+
+		for (size_t j = 0; j < attributeCount; j++) {
+			string_t attributeName = readNext(input, arguments, i, true);
+			TypeId attributeType = writer->toTypeId(readNext(input, arguments, i, true));
+			attributes[j] = {attributeName, attributeType};
+		}
+
+		writer->startRelation(relationName, attributes, writeHeader);
+
+		while (true) {
+			string_t value = readNext(input, arguments, i, false);
+			if (value.empty() && (input.eof() || input.fail() || (!readStdIn && i >= arguments.size()))) break;
+			else writer->writeAttribute(value);
+			// TODO: check attribute count (avoid unfinished records)
+		}
+	}
+};
+
+}
+}
+}