Lua API: Enable plugins to play a campaign

This also fixes some issues that can prevent a plugin from working with the GUI (that is, only working in headless mode). Plugins should work in both headless and GUI mode.

src/game_launcher.cpp

@@ -751,14 +751,20 @@ std::string game_launcher::jump_to_campaign_id() const
 	return jump_to_campaign_.campaign_id;
 }
 
+bool game_launcher::play_campaign() {
+	if(new_campaign()) {
+		state_.set_skip_story(jump_to_campaign_.skip_story);
+		jump_to_campaign_.jump = false;
+		launch_game(reload_mode::NO_RELOAD_DATA);
+		return true;
+	}
+	return false;
+}
+
 bool game_launcher::goto_campaign()
 {
 	if(jump_to_campaign_.jump) {
-		if(new_campaign()) {
-			state_.set_skip_story(jump_to_campaign_.skip_story);
-			jump_to_campaign_.jump = false;
-			launch_game(reload_mode::NO_RELOAD_DATA);
-		} else {
+		if(!play_campaign()) {
 			jump_to_campaign_.jump = false;
 			return false;
 		}

src/game_launcher.hpp

@@ -102,6 +102,7 @@ public:
 	void select_mp_server(const std::string& server) { multiplayer_server_ = server; }
 	bool play_multiplayer(mp_mode mode);
 	bool play_multiplayer_commandline();
+	bool play_campaign();
 	bool change_language();
 
 	void launch_game(reload_mode reload = reload_mode::RELOAD_DATA);

src/gui/dialogs/campaign_selection.cpp

@@ -39,6 +39,23 @@ namespace gui2::dialogs
 
 REGISTER_DIALOG(campaign_selection)
 
+campaign_selection::campaign_selection(ng::create_engine& eng)
+	: modal_dialog(window_id())
+	, engine_(eng)
+	, choice_(-1)
+	, rng_mode_(RNG_DEFAULT)
+	, mod_states_()
+	, page_ids_()
+	, difficulties_()
+	, current_difficulty_()
+	, current_sorting_(RANK)
+	, currently_sorted_asc_(true)
+	, mod_ids_()
+{
+	set_show_even_without_video(true);
+	set_allow_plugin_skip(false);
+}
+
 void campaign_selection::campaign_selected()
 {
 	tree_view& tree = find_widget<tree_view>("campaign_tree");
@@ -425,6 +442,28 @@ void campaign_selection::pre_show()
 	connect_signal_notify_modified(diff_menu, std::bind(&campaign_selection::difficulty_selected, this));
 
 	campaign_selected();
+
+	plugins_context_.reset(new plugins_context("Campaign Selection"));
+	plugins_context_->set_callback("create", [this](const config&) { set_retval(retval::OK); }, false);
+	plugins_context_->set_callback("quit", [this](const config&) { set_retval(retval::CANCEL); }, false);
+
+	plugins_context_->set_accessor("find_level", [this](const config& cfg) {
+		const std::string id = cfg["id"].str();
+		auto result = engine_.find_level_by_id(id);
+		return config {
+			"index", result.second,
+			"type", level_type::get_string(result.first),
+		};
+	});
+
+	plugins_context_->set_accessor_int("find_mod", [this](const config& cfg) {
+		return engine_.find_extra_by_id(ng::create_engine::MOD, cfg["id"]);
+	});
+
+	plugins_context_->set_callback("select_level", [this](const config& cfg) {
+		choice_ = cfg["index"].to_int();
+		engine_.set_current_level(choice_);
+	}, true);
 }
 
 void campaign_selection::add_campaign_to_tree(const config& campaign)

src/gui/dialogs/campaign_selection.hpp

@@ -18,13 +18,14 @@
 #include "gui/dialogs/modal_dialog.hpp"
 
 #include "game_initialization/create_engine.hpp"
+#include "gui/dialogs/multiplayer/plugin_executor.hpp"
 
 #include <boost/dynamic_bitset.hpp>
 
 namespace gui2::dialogs
 {
 
-class campaign_selection : public modal_dialog
+class campaign_selection : public modal_dialog, private plugin_executor
 {
 	enum CAMPAIGN_ORDER {RANK, DATE, NAME};
 public:
@@ -41,20 +42,7 @@ public:
 		RNG_BIASED,
 	};
 
-	explicit campaign_selection(ng::create_engine& eng)
-		: modal_dialog(window_id())
-		, engine_(eng)
-		, choice_(-1)
-		, rng_mode_(RNG_DEFAULT)
-		, mod_states_()
-		, page_ids_()
-		, difficulties_()
-		, current_difficulty_()
-		, current_sorting_(RANK)
-		, currently_sorted_asc_(true)
-		, mod_ids_()
-	{
-	}
+	explicit campaign_selection(ng::create_engine& eng);
 
 	/***** ***** ***** setters / getters for members ***** ****** *****/
 

src/gui/dialogs/loading_screen.cpp

@@ -93,6 +93,7 @@ loading_screen::loading_screen(std::function<void()> f)
 
 	current_visible_stage_ = visible_stages_.end();
 	singleton_ = this;
+	set_allow_plugin_skip(false);
 }
 
 void loading_screen::pre_show()

src/gui/dialogs/modal_dialog.cpp

@@ -66,20 +66,25 @@ bool modal_dialog::show(const unsigned auto_close_time)
 {
 	if(video::headless() && !show_even_without_video_) {
 		DBG_DP << "modal_dialog::show denied";
-		if(!allow_plugin_skip_) {
-			return false;
-		}
+		return false;
+	}
+	if(allow_plugin_skip_) {
+		bool skipped = false;
 
 		plugins_manager* pm = plugins_manager::get();
 		if (pm && pm->any_running())
 		{
 			plugins_context pc("Dialog");
-			pc.set_callback("skip_dialog", [this](config) { retval_ = retval::OK; }, false);
-			pc.set_callback("quit", [](config) {}, false);
+			pc.set_callback("skip_dialog", [this, &skipped](config) { retval_ = retval::OK; skipped = true; }, false);
+			pc.set_callback("quit", [this, &skipped](config) { retval_ = retval::CANCEL; skipped = true; }, false);
+			pc.set_callback("select", [this, &skipped](config c) { retval_ = c["retval"].to_int(); skipped = true; }, false);
+			pc.set_accessor_string("id", [this](config) { return window_id(); });
 			pc.play_slice();
 		}
 
-		return false;
+		if(skipped) {
+			return false;
+		}
 	}
 
 	init_fields();

src/gui/dialogs/sp_options_configure.cpp

@@ -28,12 +28,17 @@ sp_options_configure::sp_options_configure(ng::create_engine& create_engine, ng:
 	, config_engine_(config_engine)
 	, options_manager_()
 {
+	set_show_even_without_video(true);
+	set_allow_plugin_skip(false);
 }
 
 void sp_options_configure::pre_show()
 {
 	options_manager_.reset(new mp_options_helper(*this, create_engine_));
 	options_manager_->update_all_options();
+
+	plugins_context_.reset(new plugins_context("Campaign Configure"));
+	plugins_context_->set_callback("launch", [this](const config&) { set_retval(retval::OK); }, false);
 }
 
 void sp_options_configure::post_show()

src/wesnoth.cpp

@@ -762,6 +762,8 @@ static int do_gameloop(commandline_options& cmdline_opts)
 
 	const plugins_context::reg_vec callbacks {
 		{"play_multiplayer", std::bind(&game_launcher::play_multiplayer, game.get(), game_launcher::mp_mode::CONNECT)},
+		{"play_local", std::bind(&game_launcher::play_multiplayer, game.get(), game_launcher::mp_mode::LOCAL)},
+		{"play_campaign", std::bind(&game_launcher::play_campaign, game.get())},
 	};
 
 	const plugins_context::areg_vec accessors {