add replay_helper class

the main intention was to make the file replay.cpp smaller during writing pr 121.
also in order to use synced_context::run_in_synced_context this is useful.
(replay_helper.cpp was already accidently moved into makelist.txt in a pevious commit (add new rng))

src/SConscript

@@ -482,6 +482,7 @@ wesnoth_sources = Split("""
 	random_new_deterministic.cpp
 	random_new_synced.cpp
 	replay.cpp
+	replay_helper.cpp
     replay_controller.cpp
     resources.cpp
     save_blocker.cpp

src/replay_helper.cpp

@@ -0,0 +1,156 @@
+/*
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+#include "replay_helper.hpp"
+
+#include <string>
+#include <cassert>
+#include "map_location.hpp"
+#include "time_of_day.hpp"
+#include "resources.hpp"
+#include "play_controller.hpp"
+
+//void replay::add_recruit(const std::string& type_id, const map_location& loc, const map_location& from)
+config replay_helper::get_recruit(const std::string& type_id, const map_location& loc, const map_location& from)
+{
+	config val;
+	val["type"] = type_id;
+	loc.write(val);
+	config& leader_position = val.add_child("from");
+	from.write(leader_position);
+
+	return val;
+}
+
+config replay_helper::get_recall(const std::string& unit_id, const map_location& loc, const map_location& from)
+{
+
+	config val;
+	val["value"] = unit_id;
+	loc.write(val);
+	config& leader_position = val.add_child("from");
+	from.write(leader_position);
+
+	return val;
+}
+
+config replay_helper::get_disband(const std::string& unit_id)
+{
+	config val;
+
+	val["value"] = unit_id;
+	
+	return val;
+}
+
+
+/**
+ * Records a move that follows the provided @a steps.
+ * This should be the steps to be taken this turn, ending in an
+ * apparently-unoccupied (from the moving team's perspective) hex.
+ */
+config replay_helper::get_movement(const std::vector<map_location>& steps)
+{
+	assert(!steps.empty());
+	
+	config move;
+	write_locations(steps, move);
+
+	return move;
+}
+
+
+
+config replay_helper::get_attack(const map_location& a, const map_location& b,
+	int att_weapon, int def_weapon, const std::string& attacker_type_id,
+	const std::string& defender_type_id, int attacker_lvl,
+	int defender_lvl, const size_t turn, const time_of_day &t)
+{
+
+	config move, src, dst;
+	a.write(src);
+	b.write(dst);
+
+	move.add_child("source",src);
+	move.add_child("destination",dst);
+
+
+	move["weapon"] = att_weapon;
+	move["defender_weapon"] = def_weapon;
+	move["attacker_type"] = attacker_type_id;
+	move["defender_type"] = defender_type_id;
+	move["attacker_lvl"] = attacker_lvl;
+	move["defender_lvl"] = defender_lvl;
+	move["turn"] = int(turn);
+	move["tod"] = t.id;
+	/*
+	add_unit_checksum(a,current_);
+	add_unit_checksum(b,current_);
+	*/
+	return move;
+}
+
+/**
+ * Records that the player has toggled automatic shroud updates.
+ */
+config replay_helper::get_auto_shroud(bool turned_on)
+{
+	config child;
+	child["active"] = turned_on;
+	return child;
+}
+
+/**
+ * Records that the player has manually updated fog/shroud.
+ */
+config replay_helper::get_update_shroud()
+{
+	return config();
+}
+
+
+config replay_helper::get_init_side()
+{
+	config init_side;
+		init_side["side_number"] = resources::controller->current_side();
+	return init_side;
+}
+/*
+void replay::end_turn()
+{
+	config* const cmd = add_command();
+	cmd->add_child("end_turn");
+}*/
+
+config replay_helper::get_event(const std::string& name, const map_location& loc, const map_location*  last_select_loc)
+{
+	config ev;
+	ev["raise"] = name;
+	if(loc.valid()) {
+		config& source = ev.add_child("source");
+		loc.write(source);
+	}
+	if(last_select_loc != NULL && last_select_loc->valid())
+	{
+		config& source = ev.add_child("last_select");
+		last_select_loc->write(source);
+	}
+	//(*cmd)["undo"] = false;
+	return ev;
+}
+
+config replay_helper::get_lua_ai(const std::string& lua_code)
+{
+	config child;
+	child["code"] = lua_code;
+	return child;
+}

src/replay_helper.hpp

@@ -0,0 +1,52 @@
+/*
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+#ifndef REPLAY_HELPER_H_INCLUDED
+#define REPLAY_HELPER_H_INCLUDED
+
+
+#include "config.hpp"
+#include <string>
+struct map_location;
+struct time_of_day;
+
+class replay_helper
+{
+public:
+	static config get_recruit(const std::string& type_id, const map_location& loc, const map_location& from);
+
+	static config get_recall(const std::string& unit_id, const map_location& loc, const map_location& from);
+
+	static config get_disband(const std::string& unit_id);
+	//TODO: add some additional checkup (unit checksum) here.
+	static config get_movement(const std::vector<map_location>& steps);
+
+	static config get_attack(const map_location& a, const map_location& b,
+		int att_weapon, int def_weapon, const std::string& attacker_type_id,
+		const std::string& defender_type_id, int attacker_lvl,
+		int defender_lvl, const size_t turn, const time_of_day &t);
+
+	static config get_auto_shroud(bool turned_on);
+
+	static config get_update_shroud();
+
+	static config get_init_side();
+	/*
+		
+	*/
+	static config get_event(const std::string& name, const map_location& loc, const map_location*  last_select_loc);
+
+	static config get_lua_ai(const std::string& lua_code);
+
+};
+
+#endif