Make single character prompts more robust

src/actions.cpp

@@ -281,9 +281,9 @@ void confirmAction(const boost::format &description)
 	<< " [" << NC::Format::Bold << 'y' << NC::Format::NoBold
 	<< '/' << NC::Format::Bold << 'n' << NC::Format::NoBold
 	<< "] ";
-	auto answer = Statusbar::Helpers::promptReturnOneOf({"y", "n"});
-	if (answer == "n")
-		throw NC::PromptAborted(std::move(answer));
+	char answer = Statusbar::Helpers::promptReturnOneOf({'y', 'n'});
+	if (answer == 'n')
+		throw NC::PromptAborted(std::string(1, answer));
 }
 
 bool isMPDMusicDirSet()
@@ -2106,7 +2106,7 @@ void ToggleReplayGainMode::run()
 		<< "/" << NC::Format::Bold << 't' << NC::Format::NoBold << "rack"
 		<< "/" << NC::Format::Bold << 'a' << NC::Format::NoBold << "lbum"
 		<< "] ";
-		rgm = Statusbar::Helpers::promptReturnOneOf({"t", "a", "o"})[0];
+		rgm = Statusbar::Helpers::promptReturnOneOf({'t', 'a', 'o'});
 	}
 	switch (rgm)
 	{
@@ -2176,7 +2176,7 @@ void AddRandomItems::run()
 		<< "/" << "album" << NC::Format::Bold << 'A' << NC::Format::NoBold << "rtists"
 		<< "/" << "al" << NC::Format::Bold << 'b' << NC::Format::NoBold << "ums"
 		<< "] ";
-		rnd_type = Statusbar::Helpers::promptReturnOneOf({"s", "a", "A", "b"})[0];
+		rnd_type = Statusbar::Helpers::promptReturnOneOf({'s', 'a', 'A', 'b'});
 	}
 
 	mpd_tag_type tag_type = MPD_TAG_ARTIST;
@@ -2262,7 +2262,7 @@ void ToggleLibraryTagType::run()
 		<< "/" << NC::Format::Bold << 'c' << NC::Format::NoBold << "omposer"
 		<< "/" << NC::Format::Bold << 'p' << NC::Format::NoBold << "erformer"
 		<< "] ";
-		tag_type = Statusbar::Helpers::promptReturnOneOf({"a", "A", "y", "g", "c", "p"})[0];
+		tag_type = Statusbar::Helpers::promptReturnOneOf({'a', 'A', 'y', 'g', 'c', 'p'});
 	}
 	mpd_tag_type new_tagitem = charToTagType(tag_type);
 	if (new_tagitem != Config.media_lib_primary_tag)

src/curses/window.h

@@ -132,9 +132,11 @@ const Type EoF      = Special | 279;
 /// @see Window::getString()
 struct PromptAborted : std::exception
 {
+	PromptAborted() { }
+
 	template <typename ArgT>
 	PromptAborted(ArgT &&prompt)
-	: m_prompt(std::forward<ArgT>(prompt)) { }
+		: m_prompt(std::forward<ArgT>(prompt)) { }
 
 	virtual const char *what() const noexcept override { return m_prompt.c_str(); }
 

src/statusbar.cpp

@@ -195,18 +195,19 @@ bool Statusbar::Helpers::mainHook(const char *)
 	return true;
 }
 
-std::string Statusbar::Helpers::promptReturnOneOf(std::vector<std::string> values)
+char Statusbar::Helpers::promptReturnOneOf(const std::vector<char> &values)
 {
-	Statusbar::Helpers::ImmediatelyReturnOneOf prompt_hook(std::move(values));
-	NC::Window::ScopedPromptHook hook(*wFooter, prompt_hook);
-	int x = wFooter->getX(), y = wFooter->getY();
-	std::string result;
+	if (values.empty())
+		throw std::logic_error("empty vector of acceptable input");
+	NC::Key::Type result;
 	do
 	{
-		wFooter->goToXY(x, y);
-		result = wFooter->prompt();
+		wFooter->refresh();
+		result = wFooter->readKey();
+		if (result == NC::Key::Ctrl_C || result == NC::Key::Ctrl_G)
+			throw NC::PromptAborted();
 	}
-	while (!prompt_hook.isOneOf(result));
+	while (std::find(values.begin(), values.end(), result) == values.end());
 	return result;
 }
 

src/statusbar.h

@@ -69,8 +69,8 @@ void mpd();
 /// called each time user types another character while inside Window::getString
 bool mainHook(const char *);
 
-/// prompt and return one of the strings specified in the vector
-std::string promptReturnOneOf(std::vector<std::string> values);
+/// prompt and return one of the characters specified in the vector
+char promptReturnOneOf(const std::vector<char> &values);
 
 struct ImmediatelyReturnOneOf
 {