From 372bf08e79fc9fe47bc3e5fd5e2711ea0266139e Mon Sep 17 00:00:00 2001
From: Garux <garux@mail.ru>
Date: Mon, 10 Feb 2025 22:51:45 +0500
Subject: [PATCH] * add bobToolz.explodeEntity: create group entity from each
 primitive of existing group entity closes #212

---
 contrib/bobtoolz/bobToolz-GTK.cpp     |  4 ++
 contrib/bobtoolz/funchandlers-GTK.cpp | 64 +++++++++++++++++++++++++++
 contrib/bobtoolz/funchandlers.h       |  1 +
 docs/changelog-custom.txt             |  1 +
 4 files changed, 70 insertions(+)

diff --git a/contrib/bobtoolz/bobToolz-GTK.cpp b/contrib/bobtoolz/bobToolz-GTK.cpp
index 4f8d257e..fb0f032f 100644
--- a/contrib/bobtoolz/bobToolz-GTK.cpp
+++ b/contrib/bobtoolz/bobToolz-GTK.cpp
@@ -66,6 +66,7 @@ constexpr char PLUGIN_COMMANDS[] = "About...,"
                                    "Polygon Builder,"
                                    "Caulk Selection,"
                                    "-,"
+                                   "Explode Entity,"
                                    "Tree Planter,"
                                    "Drop Entity,"
                                    "Plot Splines,"
@@ -163,6 +164,9 @@ extern "C" void QERPlug_Dispatch( const char *p, vec3_t vMin, vec3_t vMax, bool
 	else if ( string_equal_nocase( p, "path plotter..." ) ) {
 		DoPathPlotter();
 	}
+	else if ( string_equal_nocase( p, "explode entity" ) ) {
+		DoExplodeEntity();
+	}
 	else if ( string_equal_nocase( p, "about..." ) ) {
 		DoMessageBox( PLUGIN_ABOUT, "About" );
 	}
diff --git a/contrib/bobtoolz/funchandlers-GTK.cpp b/contrib/bobtoolz/funchandlers-GTK.cpp
index 2125c9d8..d10e884d 100644
--- a/contrib/bobtoolz/funchandlers-GTK.cpp
+++ b/contrib/bobtoolz/funchandlers-GTK.cpp
@@ -865,5 +865,69 @@ void DoFlipTerrain() {
 		Path_deleteTop( brushes[i]->path() );
 		delete newBrushes[i];
 	}
+}
 
+
+class ExplodeWalker : public scene::Traversable::Walker
+{
+	scene::Node* m_entitynode;
+	scene::Cloneable* m_entitycloneable;
+	scene::Traversable* m_traversableroot;
+public:
+	ExplodeWalker( scene::Node* entitynode, scene::Cloneable* entitycloneable, scene::Traversable* traversableroot )
+	: m_entitynode( entitynode ), m_entitycloneable( entitycloneable ), m_traversableroot( traversableroot ){
+	}
+	bool pre( scene::Node& node ) const {
+		return false;
+	}
+	void post( scene::Node& node ) const {
+		NodeSmartReference clone( m_entitycloneable->clone() ); // duplicate entity
+		m_traversableroot->insert( clone );
+
+		NodeSmartReference brush( node ); // move primitive
+		Node_getTraversable( *m_entitynode )->erase( node );
+		Node_getTraversable( clone )->insert( node );
+	}
+};
+
+void DoExplodeEntity(){
+	scene::Node* entitynode = nullptr;
+	scene::Node* rootnode = nullptr;
+	{
+		if( GlobalSelectionSystem().countSelected() == 0 ){
+			globalErrorStream() << "nothing selected\n";
+			return;
+		}
+		scene::Path path = GlobalSelectionSystem().ultimateSelected().path();
+		Entity* entity = Node_getEntity( path.top() );
+		if ( entity == nullptr && path.size() >= 3 ) { // path.size() = 3 as in root.entity.brush, guarantees getting `rootnode` later
+			path.pop();
+			entity = Node_getEntity( path.top() );
+		}
+		if( entity == nullptr ){
+			globalErrorStream() << "no entity selected\n";
+			return;
+		}
+		if( !entity->isContainer() ){
+			globalErrorStream() << "!entity->isContainer()\n";
+			return;
+		}
+		if( string_equal_nocase( entity->getClassName(), "worldspawn" ) ){
+			globalErrorStream() << "can't explode worldspawn\n";
+			return;
+		}
+		entitynode = path.top().get_pointer();
+		rootnode = path.parent().get_pointer();
+	}
+
+	if( scene::Traversable* traversable = Node_getTraversable( *entitynode ) ){
+		if( scene::Traversable* traversableroot = Node_getTraversable( *rootnode ) ){
+			if( scene::Cloneable* entitycloneable = NodeTypeCast<scene::Cloneable>::cast( *entitynode ) ){
+				UndoableCommand undo( "bobToolz.explodeEntity" );
+				ExplodeWalker walker( entitynode, entitycloneable, traversableroot );
+				traversable->traverse( walker );
+				traversableroot->erase( *entitynode ); // remove original entity
+			}
+		}
+	}
 }
diff --git a/contrib/bobtoolz/funchandlers.h b/contrib/bobtoolz/funchandlers.h
index c53668ee..3b59e220 100644
--- a/contrib/bobtoolz/funchandlers.h
+++ b/contrib/bobtoolz/funchandlers.h
@@ -72,3 +72,4 @@ void DoTreePlanter();
 void DoDropEnts();
 void DoMakeChain();
 void DoFlipTerrain();
+void DoExplodeEntity();
diff --git a/docs/changelog-custom.txt b/docs/changelog-custom.txt
index ec963b1a..ced6cc9e 100644
--- a/docs/changelog-custom.txt
+++ b/docs/changelog-custom.txt
@@ -1110,6 +1110,7 @@ misc...
 	* light radiuses: don't render biggest radius, make them less occluding in 3D
 	* fix surface inspector updates on patch texturing changes, on UV Tool edits
 	* add prefs->Build->Region Box Shader (shader to use on the box generated around region)
+	* add bobToolz.explodeEntity: create group entity from each primitive of existing group entity