Disable plugs when there are no sockets to place them.

mods/ts/rules/gdi-structures.yaml

@@ -63,9 +63,18 @@ GAPOWR:
 		RequiresCondition: !empdisable && powrup.b
 		Amount: 50
 	ProvidesPrerequisite@buildingname:
+	ProvidesPrerequisite@pluggable:
+		RequiresCondition: !powrup.a || !powrup.b
+		Prerequisite: gapowr.socket
 	IsometricSelectable:
 		Height: 48
 
+GAPOWR.SOCKET:
+	AlwaysVisible:
+	Interactable:
+	Tooltip:
+		Name: GDI Power Plant socket
+
 GAPOWRUP:
 	Inherits: ^BuildingPlug
 	Valued:
@@ -75,7 +84,7 @@ GAPOWRUP:
 	Buildable:
 		Queue: Building
 		BuildPaletteOrder: 100
-		Prerequisites: gapowr, ~structures.gdi, ~techlevel.medium
+		Prerequisites: gapowr.socket, ~structures.gdi, ~techlevel.medium
 		Description: Provides extra power generation.
 	Plug:
 		Type: powrup
@@ -524,9 +533,27 @@ GAPLUG:
 		PauseOnCondition: disabled
 		Sequence: idle-hunterseekerb
 	ProvidesPrerequisite@buildingname:
+	ProvidesPrerequisite@pluggableion:
+		RequiresCondition: !plug.ioncannona && !plug.ioncannonb
+		Prerequisite: gaplug.socket.ioncannon
+	ProvidesPrerequisite@pluggablehunter:
+		RequiresCondition: !plug.hunterseekera && !plug.hunterseekerb
+		Prerequisite: gaplug.socket.hunterseeker
 	IsometricSelectable:
 		Height: 48
 
+GAPLUG.SOCKET.IONCANNON:
+	AlwaysVisible:
+	Interactable:
+	Tooltip:
+		Name: GDI Upgrade Center socket
+
+GAPLUG.SOCKET.HUNTERSEEKER:
+	AlwaysVisible:
+	Interactable:
+	Tooltip:
+		Name: GDI Upgrade Center socket
+
 GAPLUG2:
 	Inherits: ^BuildingPlug
 	Valued:
@@ -536,7 +563,7 @@ GAPLUG2:
 	Buildable:
 		Queue: Building
 		BuildPaletteOrder: 110
-		Prerequisites: gaplug, gatech, gaweap, ~structures.gdi, ~techlevel.superweapons
+		Prerequisites: gaplug.socket.hunterseeker, gatech, gaweap, ~structures.gdi, ~techlevel.superweapons
 		Description: Enables use of the hunter-seeker droid.
 	Plug:
 		Type: plug.hunterseeker
@@ -552,7 +579,7 @@ GAPLUG3:
 	Buildable:
 		Queue: Building
 		BuildPaletteOrder: 120
-		Prerequisites: gaplug, gatech, ~structures.gdi, ~techlevel.superweapons
+		Prerequisites: gaplug.socket.ioncannon, gatech, ~structures.gdi, ~techlevel.superweapons
 		Description: Enables use of the Ion Cannon.
 	Plug:
 		Type: plug.ioncannon

mods/ts/rules/gdi-support.yaml

@@ -134,11 +134,20 @@ GACTWR:
 			tower.rocket: !build-incomplete && !tower.rocket && !tower.vulcan && !tower.sam
 			tower.sam: !build-incomplete && !tower.vulcan && !tower.rocket && !tower.sam
 	ProvidesPrerequisite@buildingname:
+	ProvidesPrerequisite@pluggable:
+		RequiresCondition: !build-incomplete && !tower.vulcan && !tower.rocket && !tower.sam
+		Prerequisite: gactwr.socket
 	Replacement:
 		ReplaceableTypes: GDITower
 	IsometricSelectable:
 		Height: 48
 
+GACTWR.SOCKET:
+	AlwaysVisible:
+	Interactable:
+	Tooltip:
+		Name: Component Tower (unupgraded)
+
 GAVULC:
 	Inherits: ^BuildingPlug
 	Valued:
@@ -148,7 +157,7 @@ GAVULC:
 	Buildable:
 		Queue: Defense
 		BuildPaletteOrder: 80
-		Prerequisites: gactwr, gapile, ~structures.gdi, ~techlevel.low
+		Prerequisites: gactwr.socket, gapile, ~structures.gdi, ~techlevel.low
 		Description: Basic base defense.\nDoes not require power to operate.\n  Strong vs Infantry, Light armor\n  Weak vs Aircraft
 	Plug:
 		Type: tower.vulcan
@@ -164,7 +173,7 @@ GAROCK:
 	Buildable:
 		Queue: Defense
 		BuildPaletteOrder: 90
-		Prerequisites: gactwr, gapile, ~structures.gdi, ~techlevel.high
+		Prerequisites: gactwr.socket, gapile, ~structures.gdi, ~techlevel.high
 		Description: GDI Advanced base defense.\nDoes not require power to operate.\n  Strong vs Armored ground units\n  Weak vs Aircraft
 	Plug:
 		Type: tower.rocket
@@ -180,7 +189,7 @@ GACSAM:
 	Buildable:
 		Queue: Defense
 		BuildPaletteOrder: 100
-		Prerequisites: gactwr, garadr, ~structures.gdi, ~techlevel.medium
+		Prerequisites: gactwr.socket, garadr, ~structures.gdi, ~techlevel.medium
 		Description: GDI Anti-Air base defense.\nDoes not require power to operate.\n  Strong vs Aircraft\n  Weak vs Ground units
 	Plug:
 		Type: tower.sam