From a382caf571d5eb283a156a12f91ab0463749561f Mon Sep 17 00:00:00 2001
From: RoyBerube <royberube1965@gmail.com>
Date: Sun, 7 Nov 2021 22:57:36 -0700
Subject: [PATCH] Item activation from examine menu

---
 src/game.cpp        |  9 +++++++--
 src/item.h          |  6 +++++-
 src/item_action.cpp | 18 +++++++++++-------
 3 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/src/game.cpp b/src/game.cpp
index 8b190c883860e..efc75f5a33d01 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -1800,10 +1800,15 @@ int game::inventory_item_menu( item_location locThisItem,
                 case 'a': {
                     contents_change_handler handler;
                     handler.unseal_pocket_containing( locThisItem );
-                    if( !locThisItem.get_item()->is_container() ) {
+                    if( locThisItem.get_item()->type->has_use() &&
+                        !locThisItem.get_item()->item_has_uses_recursive( true ) ) {
+                        // Item has uses and none of its contents (if any) has uses.
                         avatar_action::use_item( u, locThisItem );
-                    } else {
+                    } else if( locThisItem.get_item()->item_has_uses_recursive() ) {
                         game::item_action_menu( locThisItem );
+                    } else {
+                        add_msg( m_info, _( "You can't use a %s there." ), locThisItem->tname() );
+                        break;
                     }
                     handler.handle_by( u );
                     break;
diff --git a/src/item.h b/src/item.h
index 74d3907025ae3..6e6b214bcd197 100644
--- a/src/item.h
+++ b/src/item.h
@@ -844,7 +844,11 @@ class item : public visitable
         item in_container( const itype_id &container_type, int qty = INFINITE_CHARGES,
                            bool sealed = true ) const;
 
-        bool item_has_uses_recursive() const;
+        /**
+        * True if item and its contents have any uses.
+        * @param contents_only Set to true to ignore the item itself and check only its contents.
+        */
+        bool item_has_uses_recursive( bool contents_only = false ) const;
 
         /*@{*/
         /**
diff --git a/src/item_action.cpp b/src/item_action.cpp
index 636a21214f3bd..d0e2902e98474 100644
--- a/src/item_action.cpp
+++ b/src/item_action.cpp
@@ -82,10 +82,9 @@ item_action_generator::item_action_generator() = default;
 
 item_action_generator::~item_action_generator() = default;
 
-// Get use methods of this item and its contents
-bool item::item_has_uses_recursive() const
+bool item::item_has_uses_recursive( bool contents_only ) const
 {
-    if( !type->use_methods.empty() ) {
+    if( !contents_only && !type->use_methods.empty() ) {
         return true;
     }
 
@@ -264,6 +263,9 @@ void game::item_action_menu( item_location loc )
             pseudos.push_back( const_cast<item *>( pseudo ) );
         }
     } else {
+        if( loc.get_item()->type->has_use() ) {
+            pseudos.push_back( const_cast< item * >( loc.get_item() ) );
+        }
         loc.get_item()->visit_contents( [&pseudos]( item * node, item * ) {
             if( node->type->use_methods.empty() ) {
                 return VisitResponse::NEXT;
@@ -327,10 +329,12 @@ void game::item_action_menu( item_location loc )
     } );
     // Sort mapped actions.
     sort_menu( menu_items.begin(), menu_items.end() );
-    // Add unmapped but binded actions to the menu vector.
-    for( const auto &elem : item_actions ) {
-        if( key_bound_to( ctxt, elem.first ).has_value() && !assigned_action( elem.first ) ) {
-            menu_items.emplace_back( elem.first, gen.get_action_name( elem.first ), "-" );
+    if( !loc ) {
+        // Add unmapped but binded actions to the menu vector.
+        for( const auto &elem : item_actions ) {
+            if( key_bound_to( ctxt, elem.first ).has_value() && !assigned_action( elem.first ) ) {
+                menu_items.emplace_back( elem.first, gen.get_action_name( elem.first ), "-" );
+            }
         }
     }
     // Sort unmapped actions.