bindings: allow for binding multiple chains to one key

doc/bindings

@@ -22,17 +22,12 @@
 ##      action2
 ##      ...
 ##
-##    This creates chain of actions. When such chain is
+##    This creates a chain of actions. When such chain is
 ##    executed, each action in chain is run until the end of
-##    chain is reached or one of actions failed to execute
-##    due to its requirements not being met. Note that
-##    execution of chain of actions ALWAYS succeeds, no
-##    matter if one of actions from the chain failed (even
-##    if it was the first one in order and thus nothing
-##    was really executed). Because of that, if you decide
-##    to bind both actions and chains to a single key, make
-##    sure that chain is defined in the end. Otherwise, all
-##    actions bound to the key after chain will never be run.
+##    chain is reached or one of its actions fails to execute
+##    due to its requirements not being met. If multiple actions
+##    and/or chains are bound to the same key, they will be
+##    consecutively run until one of them gets fully executed.
 ##
 ## 3) When ncmpcpp starts, bindings configuration file is
 ##    parsed and then ncmpcpp provides "missing pieces"

src/actions.cpp

@@ -826,7 +826,8 @@ void ExecuteCommand::run()
 	if (cmd)
 	{
 		Statusbar::msg(1, "Executing %s...", cmd_name.c_str());
-		cmd->binding().execute();
+		bool res = cmd->binding().execute();
+		Statusbar::msg("Execution %s.", res ? "successful" : "unsuccessful");
 	}
 	else
 		Statusbar::msg("No command named \"%s\"", cmd_name.c_str());

src/bindings.cpp

@@ -233,7 +233,7 @@ bool BindingsConfiguration::read(const std::string &file)
 		{
 			if (!actions.empty())
 			{
-				m_commands.insert(std::make_pair(cmd_name, Command(actions, cmd_immediate)));
+				m_commands.insert(std::make_pair(cmd_name, Command(std::move(actions), cmd_immediate)));
 				actions.clear();
 				return true;
 			}

src/bindings.h

@@ -21,6 +21,8 @@
 #ifndef NCMPCPP_BINDINGS_H
 #define NCMPCPP_BINDINGS_H
 
+#include <algorithm>
+#include <boost/bind.hpp>
 #include <cassert>
 #include <unordered_map>
 #include "actions.h"
@@ -74,57 +76,43 @@ struct Binding
 {
 	typedef std::vector<Actions::BaseAction *> ActionChain;
 	
-	Binding(Actions::Type at) : m_is_single(true), m_action(&Actions::get(at)) { }
-	Binding(const ActionChain &actions) {
-		assert(actions.size() > 0);
-		if (actions.size() == 1) {
-			m_is_single = true;
-			m_action = actions[0];
-		} else {
-			m_is_single = false;
-			m_chain = new ActionChain(actions);
-		}
+	template <typename ArgT>
+	Binding(ArgT &&actions)
+	: m_actions(std::forward<ArgT>(actions)) {
+		assert(!m_actions.empty());
 	}
+	Binding(Actions::Type at)
+	: Binding(ActionChain({&Actions::get(at)})) { }
 	
 	bool execute() const {
-		bool result = false;
-		if (m_is_single) {
-			assert(m_action);
-			result = m_action->execute();
-		} else {
-			for (auto it = m_chain->begin(); it != m_chain->end(); ++it)
-				if (!(*it)->execute())
-					break;
-			result = true;
-		}
-		return result;
+		return std::all_of(m_actions.begin(), m_actions.end(),
+			boost::bind(&Actions::BaseAction::execute, _1)
+		);
 	}
 	
 	bool isSingle() const {
-		return m_is_single;
-	}
-	ActionChain *chain() const {
-		assert(!m_is_single);
-		return m_chain;
+		return m_actions.size() == 1;
 	}
+
 	Actions::BaseAction *action() const {
-		assert(m_is_single);
-		return m_action;
+		assert(isSingle());
+		return m_actions[0];
 	}
-	
+
+	const ActionChain &actions() const {
+		return m_actions;
+	}
+
 private:
-	bool m_is_single;
-	union {
-		Actions::BaseAction *m_action;
-		ActionChain *m_chain;
-	};
+	ActionChain m_actions;
 };
 
 /// Represents executable command
 struct Command
 {
-	Command(const Binding &binding_, bool immediate_)
-	: m_binding(binding_), m_immediate(immediate_) { }
+	template <typename ArgT>
+	Command(ArgT &&binding_, bool immediate_)
+	: m_binding(std::forward<ArgT>(binding_)), m_immediate(immediate_) { }
 	
 	const Binding &binding() const { return m_binding; }
 	bool immediate() const { return m_immediate; }
@@ -182,8 +170,9 @@ private:
 		return k != Key::noOp && m_bindings.find(k) == m_bindings.end();
 	}
 	
-	template <typename T> void bind(Key k, const T &t) {
-		m_bindings[k].push_back(Binding(t));
+	template <typename ArgT>
+	void bind(Key k, ArgT &&t) {
+		m_bindings[k].push_back(std::forward<ArgT>(t));
 	}
 	
 	BindingsMap m_bindings;

src/ncmpcpp.cpp

@@ -256,9 +256,7 @@ int main(int argc, char **argv)
 			try
 			{
 				auto k = Bindings.get(input);
-				for (; k.first != k.second; ++k.first)
-					if (k.first->execute())
-						break;
+				std::any_of(k.first, k.second, boost::bind(&Binding::execute, _1));
 			}
 			catch (ConversionError &e)
 			{