Jsonize vehicle parts requiring other vehicle parts to be installed

data/json/vehicleparts/vp_flags.json

@@ -3,7 +3,9 @@
     "id": "ALTERNATOR",
     "type": "json_flag",
     "context": [ "vehicle_part" ],
-    "info": "An alternator.  When mounted on a gasoline or diesel engine and the engine is on, will produce electrical power that can be stored in a battery."
+    "info": "An alternator.  When mounted on a gasoline or diesel engine and the engine is on, will produce electrical power that can be stored in a battery.",
+    "requires_flag": "ENGINE",
+    "cant_remove": "Remove attached alternator first."
   },
   {
     "id": "AISLE",
@@ -65,6 +67,13 @@
     "context": [ "vehicle_part" ],
     "info": "Closed, it prevents people from seeing through the curtain.  A door motor allows you to remotely open or close it from the vehicle controls."
   },
+  {
+    "id": "WINDOW_CURTAIN",
+    "type": "json_flag",
+    "context": [ "vehicle_part" ],
+    "requires_flag": "WINDOW",
+    "cant_remove": "Remove attached curtains first."
+  },
   {
     "id": "DOOR",
     "type": "json_flag",
@@ -123,7 +132,9 @@
     "id": "SEATBELT",
     "type": "json_flag",
     "context": [ "vehicle_part" ],
-    "info": "This part will help prevent you from being thrown from the vehicle in a collision.  You will automatically enable this part when you move into a tile with it."
+    "info": "This part will help prevent you from being thrown from the vehicle in a collision.  You will automatically enable this part when you move into a tile with it.",
+    "requires_flag": "BELTABLE",
+    "cant_remove": "Remove attached seatbelt first."
   },
   {
     "id": "STABLE",
@@ -141,7 +152,16 @@
     "id": "TURRET",
     "type": "json_flag",
     "context": [ "vehicle_part" ],
-    "info": "A heavy weapon mounted in a turret.  It can be fired from the vehicle controls."
+    "info": "A heavy weapon mounted in a turret.  It can be fired from the vehicle controls.",
+    "requires_flag": "TURRET_MOUNT",
+    "cant_remove": "Remove attached mounted weapon first."
+  },
+  {
+    "id": "TURRET_CONTROLS",
+    "type": "json_flag",
+    "context": [ "vehicle_part" ],
+    "requires_flag": "TURRET",
+    "cant_remove": "Remove attached turret controls first."
   },
   {
     "id": "WHEEL",
@@ -160,5 +180,68 @@
     "type": "json_flag",
     "context": [ "vehicle_part" ],
     "info": "You can craft here."
+  },
+  {
+    "id": "NEEDS_WHEEL_MOUNT_LIGHT",
+    "type": "json_flag",
+    "context": [ "vehicle_part" ],
+    "requires_flag": "WHEEL_MOUNT_LIGHT",
+    "cant_remove": "Remove attached wheel first."
+  },
+  {
+    "id": "NEEDS_WHEEL_MOUNT_MEDIUM",
+    "type": "json_flag",
+    "context": [ "vehicle_part" ],
+    "requires_flag": "WHEEL_MOUNT_MEDIUM",
+    "cant_remove": "Remove attached wheel first."
+  },
+  {
+    "id": "NEEDS_WHEEL_MOUNT_HEAVY",
+    "type": "json_flag",
+    "context": [ "vehicle_part" ],
+    "requires_flag": "WHEEL_MOUNT_HEAVY",
+    "cant_remove": "Remove attached wheel first."
+  },
+  {
+    "id": "NEEDS_BATTERY_MOUNT",
+    "type": "json_flag",
+    "context": [ "vehicle_part" ],
+    "requires_flag": "BATTERY_MOUNT",
+    "cant_remove": "Remove battery from mount first."
+  },
+  {
+    "id": "ON_CONTROLS",
+    "type": "json_flag",
+    "context": [ "vehicle_part" ],
+    "requires_flag": "CONTROLS",
+    "cant_remove": "Remove attached part first."
+  },
+  {
+    "id": "INTERNAL",
+    "type": "json_flag",
+    "context": [ "vehicle_part" ],
+    "requires_flag": "CARGO",
+    "cant_remove": "Remove attached part first."
+  },
+  {
+    "id": "CARGO_LOCKING",
+    "type": "json_flag",
+    "context": [ "vehicle_part" ],
+    "requires_flag": "LOCKABLE_CARGO",
+    "cant_remove": "Remove attached part first."
+  },
+  {
+    "id": "DOOR_MOTOR",
+    "type": "json_flag",
+    "context": [ "vehicle_part" ],
+    "requires_flag": "OPENABLE",
+    "cant_remove": "Remove attached part first."
+  },
+  {
+    "id": "ON_ROOF",
+    "type": "json_flag",
+    "context": [ "vehicle_part" ],
+    "requires_flag": "ROOF",
+    "cant_remove": "Remove attached part first."
   }
 ]

src/flag.cpp

@@ -24,6 +24,8 @@ void json_flag::load( const JsonObject &jo )
     jo.read( "conflicts", f.conflicts_ );
     jo.read( "inherit", f.inherit_ );
     jo.read( "craft_inherit", f.craft_inherit_ );
+    jo.read( "requires_flag", f.requires_flag_ );
+    jo.read( "cant_remove", f.cant_remove_ );
     jo.read( "taste_mod", f.taste_mod_ );
 
     // FIXME: most flags have a "context" field that isn't used for anything

src/flag.h

@@ -4,6 +4,7 @@
 
 #include <set>
 #include <string>
+#include "translations.h"
 
 class JsonObject;
 
@@ -35,6 +36,14 @@ class json_flag
             return craft_inherit_;
         }
 
+        /** Requires this flag to be installed on vehicle */
+        std::string requires_flag() const {
+            return requires_flag_;
+        }
+        std::string remove_message() const {
+            return cant_remove_.translated();
+        }
+
         /** The flag's modifier on the fun value of comestibles */
         int taste_mod() const {
             return taste_mod_;
@@ -51,6 +60,8 @@ class json_flag
         std::set<std::string> conflicts_;
         bool inherit_ = true;
         bool craft_inherit_ = false;
+        std::string requires_flag_;
+        translation cant_remove_;
         int taste_mod_ = 0;
 
         json_flag( const std::string &id = std::string() ) : id_( id ) {}

src/veh_type.h

@@ -331,6 +331,9 @@ class vpart_info
         // Display order in vehicle interact display
         int list_order;
 
+        const std::set<std::string> &get_flags() const {
+            return flags;
+        }
         bool has_flag( const std::string &flag ) const {
             return flags.count( flag ) != 0;
         }