CLIParser.h
author František Kučera <franta-hg@frantovo.cz>
Tue, 28 Nov 2023 22:45:33 +0100
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load textures from PNG, JPEG etc. files using ImageMagick only one (last) texture is currently displayed
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/**
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 * ShaderShark
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 * Copyright © 2023 František Kučera (Frantovo.cz, GlobalCode.info)
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, version 3 of the License.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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 */
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#pragma once
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#include <vector>
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#include <string>
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#include "Configuration.h"
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class CLIParser {
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private:
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	static const std::string OPTION_TEXTURE;
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	static const std::string OPTION_BACKGROUND_COLOR;
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	static const std::string OPTION_ROOT_WINDOW;
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	const std::string
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	readNext(const std::vector<std::string>& arguments, int& i) {
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		if (i < arguments.size()) return arguments[i++];
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		else throw std::logic_error("Missing CLI argument"
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				+ (i > 0 ? (" after " + arguments[i - 1]) : ""));
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	}
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	bool parseBoolean(const std::string& value) {
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		if (value == "true") return true;
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		else if (value == "false") return false;
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		else throw std::logic_error("Unable to parse boolean value: "
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				+ value + " (expecting true or false)");
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	}
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	unsigned long
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	parseHexColor(const std::string& hex) {
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		int r, g, b;
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		int count = sscanf(hex.c_str(), "%02x%02x%02x", &r, &g, &b);
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		if (count == 3) {
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			unsigned long lr, lg, lb;
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			lr = r;
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			lg = g;
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			lb = b;
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			return (lr << 16 | lg << 8 | lb);
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		} else {
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			throw std::logic_error("Invalid hex color string");
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		}
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	}
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public:
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	const Configuration parse(const std::vector<std::string>& arguments) {
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		Configuration c;
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		for (int i = 0; i < arguments.size();) {
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			const std::string& option = readNext(arguments, i);
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			if (option == OPTION_TEXTURE) {
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				Configuration::Texture tex;
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				tex.fileName = readNext(arguments, i);
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				c.textures.push_back(tex);
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			} else if (option == OPTION_BACKGROUND_COLOR) {
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				c.backgroundColor = parseHexColor(readNext(arguments, i));
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			} else if (option == OPTION_ROOT_WINDOW) {
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				c.rootWindow = std::stoul(readNext(arguments, i));
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			} else throw std::logic_error("Unsupported CLI option: " + option);
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		}
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		return c;
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	}
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};
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const std::string CLIParser::OPTION_TEXTURE = "--texture";
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const std::string CLIParser::OPTION_BACKGROUND_COLOR = "--background-color";
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const std::string CLIParser::OPTION_ROOT_WINDOW = "--root-window";