settings: configuration file processing rewrite

src/configuration.cpp

@@ -0,0 +1,181 @@
+/***************************************************************************
+ *   Copyright (C) 2008-2014 by Andrzej Rybczak                            *
+ *   electricityispower@gmail.com                                          *
+ *                                                                         *
+ *   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 2 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, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.              *
+ ***************************************************************************/
+
+#include <boost/filesystem/operations.hpp>
+#include <boost/program_options.hpp>
+#include <iostream>
+
+#include "bindings.h"
+#include "configuration.h"
+#include "config.h"
+#include "mpdpp.h"
+#include "settings.h"
+
+namespace po = boost::program_options;
+
+using std::cerr;
+using std::cout;
+
+namespace {
+
+const char *env_home;
+
+}
+
+void expand_home(std::string &path)
+{
+	if (!path.empty() && path[0] == '~')
+		path.replace(0, 1, env_home);
+}
+
+bool configure(int argc, char **argv)
+{
+	std::string bindings_path, config_path;
+
+	po::options_description options("Options");
+	options.add_options()
+		("host,h", po::value<std::string>()->default_value("localhost"), "connect to server at host")
+		("port,p", po::value<int>()->default_value(6600), "connect to server at port")
+		("config,c", po::value<std::string>(&config_path)->default_value("~/.ncmpcpp/config"), "specify configuration file")
+		("bindigs,b", po::value<std::string>(&bindings_path)->default_value("~/.ncmpcpp/bindings"), "specify bindings file")
+		("screen,s", po::value<std::string>(), "specify initial screen")
+		("help,?", "show help message")
+		("version,v", "display version information")
+	;
+
+	po::variables_map vm;
+	try
+	{
+		po::store(po::parse_command_line(argc, argv, options), vm);
+
+		if (vm.count("help"))
+		{
+			cout << "Usage: " << argv[0] << " [options]...\n" << options << "\n";
+			return false;
+		}
+		if (vm.count("version"))
+		{
+			std::cout << "ncmpcpp " << VERSION << "\n\n"
+			<< "optional screens compiled-in:\n"
+	#		ifdef HAVE_TAGLIB_H
+			<< " - tag editor\n"
+			<< " - tiny tag editor\n"
+	#		endif
+	#		ifdef HAVE_CURL_CURL_H
+			<< " - artist info\n"
+	#		endif
+	#		ifdef ENABLE_OUTPUTS
+			<< " - outputs\n"
+	#		endif
+	#		ifdef ENABLE_VISUALIZER
+			<< " - visualizer\n"
+	#		endif
+	#		ifdef ENABLE_CLOCK
+			<< " - clock\n"
+	#		endif
+			<< "\nencoding detection: "
+	#		ifdef HAVE_LANGINFO_H
+			<< "enabled"
+	#		else
+			<< "disabled"
+	#		endif // HAVE_LANGINFO_H
+			<< "\nbuilt with support for:"
+	#		ifdef HAVE_CURL_CURL_H
+			<< " curl"
+	#		endif
+	#		ifdef HAVE_FFTW3_H
+			<< " fftw"
+	#		endif
+	#		ifdef USE_PDCURSES
+			<< " pdcurses"
+	#		else
+			<< " ncurses"
+	#		endif
+	#		ifdef HAVE_TAGLIB_H
+			<< " taglib"
+	#		endif
+	#		ifdef NCMPCPP_UNICODE
+			<< " unicode"
+	#		endif
+			<< "\n";
+			return false;
+		}
+
+		po::notify(vm);
+
+		// get home directory
+		env_home = getenv("HOME");
+		if (env_home == nullptr)
+		{
+			cerr << "Fatal error: HOME environment variable is not defined\n";
+			return false;
+		}
+		expand_home(config_path);
+		expand_home(bindings_path);
+
+		// read configuration
+		if (Config.read(config_path) == false)
+			exit(1);
+
+		// read bindings
+		if (Bindings.read(bindings_path) == false)
+			exit(1);
+		Bindings.generateDefaults();
+
+		// create directories
+		boost::filesystem::create_directory(Config.ncmpcpp_directory);
+		boost::filesystem::create_directory(Config.lyrics_directory);
+
+		// try to get MPD connection details from environment variables
+		// as they take precedence over these from the configuration.
+		auto env_host = getenv("MPD_HOST");
+		auto env_port = getenv("MPD_PORT");
+		if (env_host != nullptr)
+			Mpd.SetHostname(env_host);
+		if (env_port != nullptr)
+			Mpd.SetPort(boost::lexical_cast<int>(env_port));
+
+		// if MPD connection details are provided as command line
+		// parameters, use them as their priority is the highest.
+		if (!vm["host"].defaulted())
+			Mpd.SetHostname(vm["host"].as<std::string>());
+		if (!vm["port"].defaulted())
+			Mpd.SetPort(vm["port"].as<int>());
+		Mpd.SetTimeout(Config.mpd_connection_timeout);
+
+		// custom startup screen
+		if (vm.count("screen"))
+		{
+			auto screen = vm["screen"].as<std::string>();
+			Config.startup_screen_type = stringtoStartupScreenType(screen);
+			if (Config.startup_screen_type == ScreenType::Unknown)
+			{
+				std::cerr << "Unknown screen: " << screen << "\n";
+				exit(1);
+			}
+		}
+	}
+	catch (std::exception &e)
+	{
+		cerr << "Error while processing configuration: " << e.what() << "\n";
+		exit(1);
+	}
+	return true;
+}