--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/CLIParser.h	Wed May 01 22:11:52 2019 +0200
@@ -0,0 +1,66 @@
+/**
+ * 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, 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 <vector>
+
+#include <relpipe/writer/typedefs.h>
+#include <relpipe/cli/CLI.h>
+#include <relpipe/cli/RelpipeCLIException.h>
+
+#include "Configuration.h"
+
+namespace relpipe {
+namespace tr {
+namespace awk {
+
+class CLIParser {
+private:
+
+	// FIXME: move common methods/classes to relpipe-lib-cli or relpipe-lib-helper
+
+	string_t readNext(std::vector<string_t> arguments, int& i) {
+		if (i < arguments.size()) return arguments[i++];
+		else throw relpipe::cli::RelpipeCLIException(L"Missing CLI argument" + (i > 0 ? (L" after " + arguments[i - 1]) : L""), relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);
+	}
+
+public:
+
+	static const string_t OPTION_EXPRESSION;
+
+	Configuration parse(const std::vector<string_t>& arguments) {
+		Configuration c;
+
+		for (int i = 0; i < arguments.size();) {
+			string_t option = readNext(arguments, i);
+			if (option == OPTION_EXPRESSION) c.awkExpression = readNext(arguments, i);
+			else throw relpipe::cli::RelpipeCLIException(L"Unsupported CLI option: " + option, relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);
+		}
+
+		return c;
+	}
+
+	virtual ~CLIParser() {
+	}
+};
+
+const string_t CLIParser::OPTION_EXPRESSION = L"--expression";
+
+}
+}
+}