--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CLIParser.h	Sun Nov 26 16:27:50 2023 +0100
@@ -0,0 +1,86 @@
+/**
+ * ShaderShark
+ * Copyright © 2023 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 <string>
+
+#include "Configuration.h"
+
+class CLIParser {
+private:
+
+	static const std::string OPTION_TEXTURE;
+	static const std::string OPTION_BACKGROUND_COLOR;
+	static const std::string OPTION_ROOT_WINDOW;
+
+	const std::string
+	readNext(const std::vector<std::string>& arguments, int& i) {
+		if (i < arguments.size()) return arguments[i++];
+		else throw std::logic_error("Missing CLI argument"
+				+ (i > 0 ? (" after " + arguments[i - 1]) : ""));
+	}
+
+	bool parseBoolean(const std::string& value) {
+		if (value == "true") return true;
+		else if (value == "false") return false;
+		else throw std::logic_error("Unable to parse boolean value: "
+				+ value + " (expecting true or false)");
+	}
+
+	unsigned long
+	parseHexColor(const std::string& hex) {
+		int r, g, b;
+		int count = sscanf(hex.c_str(), "%02x%02x%02x", &r, &g, &b);
+		if (count == 3) {
+			unsigned long lr, lg, lb;
+			lr = r;
+			lg = g;
+			lb = b;
+			return (lr << 16 | lg << 8 | lb);
+		} else {
+			throw std::logic_error("Invalid hex color string");
+		}
+	}
+
+public:
+
+	const Configuration parse(const std::vector<std::string>& arguments) {
+		Configuration c;
+
+		for (int i = 0; i < arguments.size();) {
+			const std::string& option = readNext(arguments, i);
+
+			if (option == OPTION_TEXTURE) {
+				Configuration::Texture tex;
+				tex.fileName = readNext(arguments, i);
+				c.textures.push_back(tex);
+			} else if (option == OPTION_BACKGROUND_COLOR) {
+				c.backgroundColor = parseHexColor(readNext(arguments, i));
+			} else if (option == OPTION_ROOT_WINDOW) {
+				c.rootWindow = std::stoul(readNext(arguments, i));
+			} else throw std::logic_error("Unsupported CLI option: " + option);
+		}
+
+		return c;
+	}
+};
+
+const std::string CLIParser::OPTION_TEXTURE = "--texture";
+const std::string CLIParser::OPTION_BACKGROUND_COLOR = "--background-color";
+const std::string CLIParser::OPTION_ROOT_WINDOW = "--root-window";