using vines to descend no longer produces grappling hooks (CleverRave…

…n#77758)

* VINE_RAPPEL

* Apply suggestions from code review

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* sort (mainly for clang, also for documentation)

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

data/json/flags.json

@@ -2463,6 +2463,11 @@
     "type": "json_flag",
     "info": "The character has extensive roots, which helps with the TREE_COMMUNION mutation."
   },
+  {
+    "id": "VINE_RAPPEL",
+    "type": "json_flag",
+    "info": "The character can use vines to safely rappel down sheer drops."
+  },
   {
     "id": "ANIMALDISCORD",
     "type": "json_flag",

data/json/mutations/mutations.json

@@ -8000,6 +8000,7 @@
     "prereqs": [ "PLANTSKIN", "BARK", "BARK2_a", "BARK2_b", "BARK2_c" ],
     "prereqs2": [ "VINES1" ],
     "changes_to": [ "VINES3" ],
+    "flags": [ "VINE_RAPPEL" ],
     "category": [ "PLANT" ],
     "attacks": [
       {
@@ -8024,6 +8025,7 @@
     "prereqs": [ "PLANTSKIN", "BARK", "BARK2_a", "BARK2_b", "BARK2_c" ],
     "prereqs2": [ "VINES2" ],
     "threshreq": [ "THRESH_PLANT" ],
+    "flags": [ "VINE_RAPPEL" ],
     "category": [ "PLANT" ],
     "active": true,
     "cost": 90,

doc/JSON_FLAGS.md

@@ -434,6 +434,7 @@ Character flags can be `trait_id`, `json_flag_id` or `flag_id`.  Some of these a
 - ```THERMOMETER``` You always know what temperature it is.
 - ```TINY``` Changes your size to `creature_size::tiny`.  Checked first of the size category flags.
 - ```TREE_COMMUNION_PLUS``` Gain greatly enhanced effects from the Mycorrhizal Communion mutation.
+- ```VINE_RAPPEL``` You can rappel down staircases and sheer drops of any height.
 - ```WALK_UNDERWATER``` your stamina burn is not increased when you swim, emulating you walking on the water bottom.
 - ```WALL_CLING``` You can ascend/descend sheer cliffs as long as the tile above borders at least one wall.  Chance to slip and fall each step.
 - ```WATERWALKING``` You can walk across the surface of the water as though it were solid ground.  Should usually be combined with `ITEM_WATERPROOFING` to protect items as well.

src/game.cpp

@@ -287,6 +287,7 @@ static const flag_id json_flag_SPLINT( "SPLINT" );
 static const flag_id json_flag_WATERWALKING( "WATERWALKING" );
 
 static const furn_str_id furn_f_rope_up( "f_rope_up" );
+static const furn_str_id furn_f_vine_up( "f_vine_up" );
 static const furn_str_id furn_f_web_up( "f_web_up" );
 
 static const harvest_drop_type_id harvest_drop_blood( "blood" );
@@ -312,6 +313,7 @@ static const json_character_flag json_flag_HYPEROPIC( "HYPEROPIC" );
 static const json_character_flag json_flag_INFECTION_IMMUNE( "INFECTION_IMMUNE" );
 static const json_character_flag json_flag_ITEM_WATERPROOFING( "ITEM_WATERPROOFING" );
 static const json_character_flag json_flag_NYCTOPHOBIA( "NYCTOPHOBIA" );
+static const json_character_flag json_flag_VINE_RAPPEL( "VINE_RAPPEL" );
 static const json_character_flag json_flag_WALL_CLING( "WALL_CLING" );
 static const json_character_flag json_flag_WEB_RAPPEL( "WEB_RAPPEL" );
 
@@ -12396,6 +12398,8 @@ void game::vertical_move( int movez, bool force, bool peeking )
     if( rope_ladder ) {
         if( u.has_flag( json_flag_WEB_RAPPEL ) ) {
             here.furn_set( u.pos_bub(), furn_f_web_up );
+        } else if( u.has_flag( json_flag_VINE_RAPPEL ) ) {
+            here.furn_set( u.pos_bub(), furn_f_vine_up );
         } else {
             here.furn_set( u.pos_bub(), furn_f_rope_up );
         }