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◆ main openmsx / src / commands / InfoCommand.cc
2.8 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
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#include "InfoCommand.hh"
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#include "CommandException.hh"
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#include "TclObject.hh"
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#include "join.hh"
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#include <cassert>
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#include <iostream>
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#include <ranges>
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namespace openmsx {
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InfoCommand::InfoCommand(CommandController& commandController_, const std::string& name_)
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	: Command(commandController_, name_)
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{
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}
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InfoCommand::~InfoCommand()
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{
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	assert(infoTopics.empty());
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}
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void InfoCommand::registerTopic(const InfoTopic& topic)
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{
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#ifndef NDEBUG
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	if (infoTopics.contains(topic.getName())) {
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		std::cerr << "INTERNAL ERROR: already have an info topic with "
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		             "name " << topic.getName() << '\n';
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		assert(false);
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	}
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#endif
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	infoTopics.insert_noDuplicateCheck(&topic);
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}
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void InfoCommand::unregisterTopic(const InfoTopic& topic)
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{
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	if (!infoTopics.contains(topic.getName())) {
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		std::cerr << "INTERNAL ERROR: can't unregister topic with name "
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		          << topic.getName() << ", not found!\n";
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		assert(false);
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	}
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	infoTopics.erase(topic.getName());
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}
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// Command
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void InfoCommand::execute(std::span<const TclObject> tokens,
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                          TclObject& result)
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{
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	switch (tokens.size()) {
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	case 1:
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		// list topics
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		result.addListElements(std::views::transform(
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			infoTopics, [](auto* t) { return t->getName(); }));
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		break;
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	default:
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		// show info about topic
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		assert(tokens.size() >= 2);
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		const auto& topic = tokens[1].getString();
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		auto it = infoTopics.find(topic);
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		if (it == end(infoTopics)) {
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			throw CommandException("No info on: ", topic);
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		}
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		(*it)->execute(tokens, result);
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		break;
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	}
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}
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std::string InfoCommand::help(std::span<const TclObject> tokens) const
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{
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	std::string result;
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	switch (tokens.size()) {
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	case 1: {
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		// show help on info cmd
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		auto topics = to_vector(std::views::transform(infoTopics, &InfoTopic::getName));
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		std::ranges::sort(topics);
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		result = strCat(
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			"Show info on a certain topic\n"
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			"  ", getName(), " <topic> [...]\n",
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			"Possible topics are:\n  ", join(topics, "\n  "), "\n",
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			"Use \"help ", getName(), " <topic>\" for more info on that specific topic.");
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		break;
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	}
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	default:
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		// show help on a certain topic
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		assert(tokens.size() >= 2);
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		auto topic = tokens[1].getString();
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		auto it = infoTopics.find(topic);
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		if (it == end(infoTopics)) {
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			throw CommandException("No info on: ", topic);
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		}
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		result = (*it)->help(tokens);
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		break;
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	}
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	return result;
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}
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void InfoCommand::tabCompletion(std::vector<std::string>& tokens) const
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{
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	switch (tokens.size()) {
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	case 2: {
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		// complete topic
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		completeString(tokens, std::views::transform(infoTopics,
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			[](auto* t) -> std::string_view { return t->getName(); }));
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		break;
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	}
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	default:
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		// show help on a certain topic
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		assert(tokens.size() >= 3);
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		if (auto it = infoTopics.find(tokens[1]); it != end(infoTopics)) {
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			(*it)->tabCompletion(tokens);
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		}
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		break;
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	}
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}
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} // namespace openmsx