feat(editor): the signalling, the hectometre posts and the terrain go to layers of their own: <scenery>_srk.scm, _hektometry.scm, _teren.scm, made by the first of them and included by the scenario file, the active layer left as it is; the station descriptions of the signalling there too

application/editormode.cpp

@@ -2986,8 +2986,9 @@ bool editor_mode::save()
     }
     first_step_done(first_step::save);
 
-    // the heightmap terrain is kept in files of its own, the scenery only needs the directive which loads it
+    // the heightmap terrain is kept in files of its own, the scenery only needs the directive which loads it, in a layer of its own
     std::vector<std::string> rootstatements;
+    std::map<scene::layer_handle, std::vector<std::string>> statements;
     if (m_streamer.active())
     {
         std::string error;
@@ -2997,7 +2998,13 @@ bool editor_mode::save()
             return false;
         }
         if (false == scene::Layers.terrain_directive())
-            rootstatements.emplace_back("heightmap_terrain " + m_streamer.name() + " endheightmap_terrain");
+        {
+            auto const directive{"heightmap_terrain " + m_streamer.name() + " endheightmap_terrain"};
+            if (auto const layer{output_layer("teren")}; layer != null_handle)
+                statements[layer].push_back(directive);
+            else
+                rootstatements.push_back(directive);
+        }
     }
 
     if (m_profile.changed)
@@ -3016,14 +3023,14 @@ bool editor_mode::save()
         m_orthophoto_mark = map;
         scene::Layers.mark(scene::layer_handle{1}, "//$o", {map});
     }
-    auto const terrainadded{false == rootstatements.empty()};
+    auto const terrainadded{false == rootstatements.empty() || false == statements.empty()};
     auto const controls{turntable_controls(rootstatements)};
     auto const noses{nose_controls(rootstatements)};
     std::vector<std::string> trailing;
     auto const placed{m_vehicle.trainset_lines(trailing)};
     if (placed == 0)
         starter_trainset(trailing);
-    auto const result = scene::Layers.save(rootstatements, trailing);
+    auto const result = scene::Layers.save(rootstatements, trailing, statements);
     if (result.success && controls)
         m_turntable_included = true;
     if (result.success && noses)

application/editormode.h

@@ -1896,8 +1896,9 @@ class editor_mode : public application_mode, private editor_track::observer, pri
 	void apply_switch_drive_choice(TTrack &Switch);
 	void switch_drive_captured(TTrack const &Track);
 	void switch_drives_committed(std::vector<TTrack *> const &Tracks);
-	// places them in the active layer, as one step of the undo. returns: how many were placed
+	scene::layer_handle output_layer(std::string const &Part) override;
-	std::size_t place_templates(std::vector<template_item> const &Items, std::string &Error) override;
+	// places them in the active layer or the given one, as one step of the undo. returns: how many were placed
+	std::size_t place_templates(std::vector<template_item> const &Items, std::string &Error, scene::layer_handle Layer = scene::layer_handle{}) override;
 	// moves them, as one step of the undo
 	std::size_t move_templates(std::vector<std::pair<standing_template, template_item>> const &Moves) override;
 	// takes them out, as one step of the undo

application/editormodelineside.cpp

@@ -243,7 +243,41 @@ std::vector<editor_mode::standing_template> editor_mode::standing_templates(std:
 	return result;
 }
 
-std::size_t editor_mode::place_templates(std::vector<template_item> const &Items, std::string &Error)
+scene::layer_handle editor_mode::output_layer(std::string const &Part)
+{
+	if (scene::Layers.empty())
+		return null_handle;
+	auto stem{scene::Layers.layer(scene::layer_handle{1}).name};
+	if (auto const slash{stem.find_last_of("/\\")}; slash != std::string::npos)
+		stem.erase(0, slash + 1);
+	if (auto const dot{stem.rfind('.')}; dot != std::string::npos)
+		stem.erase(dot);
+	stem.erase(0, stem.find_first_not_of('$'));
+	if (stem.empty())
+		stem = "scenery";
+	std::string reason;
+	// a file of that name the scenery doesn't include, or one which can't take more, gives way to the next number
+	for (int attempt = 1; attempt <= 9; ++attempt)
+	{
+		auto const name{ToLower(stem + "_" + Part + (attempt > 1 ? std::to_string(attempt) : std::string{}) + ".scm")};
+		auto layer{null_handle};
+		for (std::size_t index = 1; index <= scene::Layers.size() && layer == null_handle; ++index)
+			if (auto const &existing{scene::Layers.layer(static_cast<scene::layer_handle>(index))}; false == existing.dead && false == existing.removed && existing.name == name)
+				layer = scene::Layers.resolve(static_cast<scene::layer_handle>(index));
+		if (layer == null_handle)
+			layer = scene::Layers.create(name, scene::layer_handle{1}, reason, false);
+		if (layer != null_handle && scene::Layers.accepts(layer, &reason))
+		{
+			scene::Layers.visible(layer, true);
+			scene::Layers.locked(layer, false);
+			return layer;
+		}
+	}
+	WriteLog("Editor: no layer for " + Part + ", the active one takes it: " + reason, logtype::generic);
+	return null_handle;
+}
+
+std::size_t editor_mode::place_templates(std::vector<template_item> const &Items, std::string &Error, scene::layer_handle const Layer)
 {
 	if (Items.empty())
 		return 0;
@@ -252,7 +286,7 @@ std::size_t editor_mode::place_templates(std::vector<template_item> const &Items
 		Error = STR_C("Templates can be placed only in a scenery opened for editing (-edit)");
 		return 0;
 	}
-	auto const layer{scene::Layers.resolve(scene::Layers.active())};
+	auto const layer{scene::Layers.resolve(Layer != null_handle ? Layer : scene::Layers.active())};
 	if (std::string reason; false == scene::Layers.accepts(layer, &reason))
 	{
 		Error = STR_C("The active layer can't take them: ") + (reason.empty() ? std::string{STR_C("there's no active layer")} : reason);
@@ -569,8 +603,11 @@ void hekto_tool::hekto_place()
 		items.push_back(std::move(item));
 	}
 	std::string error;
-	auto const placed{m_templates.place_templates(items, error)};
+	auto const layer{items.empty() ? null_handle : m_templates.output_layer("hektometry")};
+	auto const placed{m_templates.place_templates(items, error, layer)};
 	tool.status = placed > 0 ? format(STR_P("%zu hectometre post placed, Ctrl+Z takes it back", "%zu hectometre posts placed, Ctrl+Z takes them back", static_cast<long long>(placed)), placed) : error;
+	if (placed > 0 && layer != null_handle)
+		tool.status += format(STR_C(" (layer \"%s\")"), scene::Layers.layer(layer).name.c_str());
 	if (placed > 0)
 		m_guide.first_step_done(editor_first_step::posts);
 	WriteLog("Editor: " + tool.status, logtype::generic);

application/editormodesignal.cpp

@@ -844,7 +844,7 @@ bool editor_mode::signal_place(signal_spot const &Spot, signal_template const &T
 	if (Template.linked)
 		item.values["#7"] = tool.linked[0] != '\0' ? std::string{tool.linked} : std::string{"none"};
 	std::string error;
-	if (place_templates({item}, error) == 0)
+	if (place_templates({item}, error, output_layer("srk")) == 0)
 	{
 		tool.status = refused(STR_C("The signal couldn't be placed: ") + error);
 		return false;
@@ -1452,7 +1452,7 @@ std::size_t editor_mode::signal_batch(signal_changes const &Changes, std::vector
 	std::vector<scene::instance_handle> instances;
 	if (Error.empty() && false == items.empty())
 	{
-		if (place_templates(items, Error) == 0)
+		if (place_templates(items, Error, output_layer("srk")) == 0)
 			reads.clear();
 		else
 		{

application/editormodesrk.cpp

@@ -879,7 +879,9 @@ srk_tool::record &srk_tool::record_of_open()
 		auto *first{m_layout->switches.front()};
 		entry.anchor = first->name();
 		entry.track = first;
-		entry.layer = alignment_store::layer_of(*first);
+		entry.layer = m_templates.output_layer("srk");
+		if (entry.layer == null_handle)
+			entry.layer = alignment_store::layer_of(*first);
 		m_records.push_back(std::move(entry));
 		m_record = static_cast<int>(m_records.size()) - 1;
 		m_anchor = first;

application/editortool.h

@@ -199,7 +199,10 @@ class editor_templates
 {
   public:
 	virtual std::vector<standing_template> standing_templates(std::function<bool(std::string const &)> const &Accept) const = 0;
-	virtual std::size_t place_templates(std::vector<template_item> const &Items, std::string &Error) = 0;
+	// the layer a tool keeps what it makes in, "<scenery>_<Part>.scm", made when the scenery has none yet. returns: null_handle if there can't be one
+	virtual scene::layer_handle output_layer(std::string const &Part) = 0;
+	// in the active layer unless given another
+	virtual std::size_t place_templates(std::vector<template_item> const &Items, std::string &Error, scene::layer_handle Layer = scene::layer_handle{}) = 0;
 	virtual std::size_t move_templates(std::vector<std::pair<standing_template, template_item>> const &Moves) = 0;
 	virtual std::size_t remove_templates(std::vector<scene::instance_handle> const &Instances) = 0;
 

lang/editor_pl.po

@@ -11469,3 +11469,6 @@ msgstr[2] "Odczyt przywrócony: %zu z %zu semaforów"
 
 msgid ": the rest stand farther than 10 m from a track, by vehicles or their events are gone"
 msgstr ": pozostałe stoją dalej niż 10 m od toru, przy torze z pojazdami albo ich zdarzenia już nie istnieją"
+
+msgid " (layer \"%s\")"
+msgstr " (warstwa \"%s\")"

scene/scenelayers.cpp

@@ -558,7 +558,7 @@ void node_layers::stat(layer_handle const Layer)
 }
 
 // creates empty layer, included from specified one. returns: handle to the new layer, or null_handle with the explanation in Reason
-layer_handle node_layers::create(std::string Name, layer_handle Parent, std::string &Reason)
+layer_handle node_layers::create(std::string Name, layer_handle Parent, std::string &Reason, bool const Activate)
 {
 	Parent = resolve(Parent);
 	if (false == valid(Parent) || layer(Parent).removed || layer(Parent).binary)
@@ -639,7 +639,10 @@ layer_handle node_layers::create(std::string Name, layer_handle Parent, std::str
 	created.context_begin = valid(anchor) ? layer(anchor).context_end : layer(Parent).context_insert();
 	created.context_end = created.context_begin;
 
-	active(layerhandle);
+	if (Activate)
+	{
+		active(layerhandle);
+	}
 
 	return layerhandle;
 }

scene/scenelayers.h

@@ -294,8 +294,8 @@ class node_layers
 	void mark(layer_handle Layer, std::string const &Mark, std::vector<std::string> Lines);
 
 	// layer management. changes are applied to the scenery files by save()
-	// creates empty layer, included from specified one. returns: handle to the new layer, or null_handle with the explanation in Reason
+	// creates empty layer, included from specified one, made active unless told otherwise. returns: handle to the new layer, or null_handle with the explanation in Reason
-	layer_handle create(std::string Name, layer_handle Parent, std::string &Reason);
+	layer_handle create(std::string Name, layer_handle Parent, std::string &Reason, bool const Activate = true);
 	bool can_remove(layer_handle Layer, std::string &Reason) const;
 	// marks specified layer and the layers it includes as dropped from the scenery. their files are left on the disk
 	bool remove(layer_handle Layer);
@@ -348,8 +348,8 @@ class node_layers
 
 	// writes changes made in the editor to the scenery files: changed, created and deleted model instances and
 	// memory cells, and layer changes. the files are left intact unless the whole operation can be performed.
-	// Rootstatements: additional statements to place at the end of the scenario file
+	// Rootstatements: additional statements to place at the end of the scenario file; Statements: the same for other layers
-	save_result save(std::vector<std::string> const &Rootstatements = {}, std::vector<std::string> const &Trailingstatements = {});
+	save_result save(std::vector<std::string> const &Rootstatements = {}, std::vector<std::string> const &Trailingstatements = {}, std::map<layer_handle, std::vector<std::string>> const &Statements = {});
 	std::string check_sources() const;
 
   private:

scene/scenelayerssave.cpp

@@ -633,7 +633,7 @@ bool node_layers::compose(save_state &State, layer_handle const Layer, compositi
 }
 
 // writes changes made in the editor to the scenery files
-save_result node_layers::save(std::vector<std::string> const &Rootstatements, std::vector<std::string> const &Trailingstatements)
+save_result node_layers::save(std::vector<std::string> const &Rootstatements, std::vector<std::string> const &Trailingstatements, std::map<layer_handle, std::vector<std::string>> const &Statements)
 {
 	save_result result;
 	if (m_layers.empty())
@@ -1455,7 +1455,7 @@ save_result node_layers::save(std::vector<std::string> const &Rootstatements, st
 			continue;
 		}
 		if (layer(candidate).created || state.patches.count(candidate) != 0 || appended.count(candidate) != 0 || created.count(candidate) != 0 || placed.count(candidate) != 0 ||
-		    markedtext.count(candidate) != 0 || (candidate == root && (false == Rootstatements.empty() || false == Trailingstatements.empty())))
+		    markedtext.count(candidate) != 0 || Statements.count(candidate) != 0 || (candidate == root && (false == Rootstatements.empty() || false == Trailingstatements.empty())))
 		{
 			outputs.emplace_back(candidate);
 		}
@@ -1568,6 +1568,14 @@ save_result node_layers::save(std::vector<std::string> const &Rootstatements, st
 				added.text += statement + eol;
 			}
 		}
+		if (auto const lookup{Statements.find(output)}; lookup != Statements.end())
+		{
+			for (auto const &statement : lookup->second)
+			{
+				ensure_newline(added.text, eol);
+				added.text += statement + eol;
+			}
+		}
 		if (output == root && false == Trailingstatements.empty())
 		{
 			composition trailing;