Refactored printing help messages in commands.

app/include/plasp-app/Command.h

@@ -35,6 +35,23 @@ class Command
 				});
 		}
 
+		void printHelp(cxxopts::Options &options)
+		{
+			const auto numberOfOptionGroups = std::tuple_size<std::decay_t<decltype(m_optionGroups)>>();
+
+			std::vector<std::string> optionGroupNames;
+			optionGroupNames.reserve(numberOfOptionGroups + 1);
+			optionGroupNames.emplace_back("");
+
+			forEach(m_optionGroups,
+				[&](auto &optionGroup)
+				{
+					optionGroupNames.emplace_back(optionGroup.Name);
+				});
+
+			std::cout << options.help(optionGroupNames) << std::endl;
+		}
+
 		std::tuple<OptionGroups...> m_optionGroups;
 };
 

app/include/plasp-app/OptionGroups.h

@@ -27,6 +27,8 @@ class OptionException : public pddl::Exception
 
 struct OptionGroupBasic
 {
+	static constexpr const auto Name = "basic";
+
 	void addTo(cxxopts::Options &options);
 	void parse(cxxopts::Options &options);
 
@@ -39,6 +41,8 @@ struct OptionGroupBasic
 
 struct OptionGroupOutput
 {
+	static constexpr const auto Name = "output";
+
 	void addTo(cxxopts::Options &options);
 	void parse(cxxopts::Options &options);
 
@@ -50,6 +54,8 @@ struct OptionGroupOutput
 
 struct OptionGroupParser
 {
+	static constexpr const auto Name = "parser";
+
 	void addTo(cxxopts::Options &options);
 	void parse(cxxopts::Options &options);