command_line/options: Implemented the first part of displaying automa…

…tic options_t help

impl/command_line/options.cxx

@@ -218,6 +218,24 @@ namespace substrate::commandLine
 				}
 			);
 		}
+
+		void optionsHolder_t::displayHelp() const noexcept
+		{
+			// Figure out how much padding is needed to make everything neat
+			const auto padding{displayPadding() + 1U};
+			std::vector<optionSet_t> optionSets{};
+
+			// Now display the non-alternation options and collect option sets
+			console.writeln("Options:"sv);
+			for (const auto &option : *this)
+			{
+				std::visit(match_t
+				{
+					[=](const option_t &value) { value.displayHelp(padding); },
+					[&](const optionSet_t &value) { optionSets.emplace_back(value); },
+				}, option);
+			}
+		}
 	} // namespace internal
 } // namespace substrate::commandLine
 

substrate/command_line/options

@@ -310,6 +310,7 @@ namespace substrate::commandLine
 			constexpr auto end() const noexcept { return optionsIterator_t{storage, length, indexFn}; }
 
 			[[nodiscard]] size_t displayPadding() const noexcept;
+			void displayHelp() const noexcept;
 		};
 	}
 
@@ -333,6 +334,7 @@ namespace substrate::commandLine
 		[[nodiscard]] constexpr auto end() const noexcept { return _options.end(); }
 
 		[[nodiscard]] size_t displayPadding() const noexcept { return _options.displayPadding(); }
+		void displayHelp() const noexcept { _options.displayHelp(); }
 	};
 
 	namespace internal