Sort nets in netlist by name; generate ordered net codes

eeschema/connection_graph.cpp

@@ -954,7 +954,8 @@ void CONNECTION_GRAPH::buildConnectionGraph()
             subgraph->AddItem( pin );
             subgraph->ResolveDrivers();
 
-            m_net_code_to_subgraphs_map[ code ].push_back( subgraph );
+            auto key = std::make_pair( subgraph->GetNetName(), code );
+            m_net_code_to_subgraphs_map[ key ].push_back( subgraph );
             m_subgraphs.push_back( subgraph );
             m_driver_subgraphs.push_back( subgraph );
 
@@ -1409,8 +1410,9 @@ void CONNECTION_GRAPH::buildConnectionGraph()
         if( subgraph->m_driver_connection->IsBus() )
             continue;
 
-        int code = subgraph->m_driver_connection->NetCode();
+        auto key = std::make_pair( subgraph->GetNetName(),
-        m_net_code_to_subgraphs_map[ code ].push_back( subgraph );
+                                   subgraph->m_driver_connection->NetCode() );
+        m_net_code_to_subgraphs_map[ key ].push_back( subgraph );
     }
 
     // Clean up and deallocate stale subgraphs

eeschema/connection_graph.h

@@ -198,6 +198,11 @@ public:
     CONNECTION_SUBGRAPH* m_hier_parent;
 };
 
+/// Associates a net code with the final name of a net
+typedef std::pair<wxString, int> NET_NAME_CODE;
+
+/// Associates a NET_CODE_NAME with all the subgraphs in that net
+typedef std::map<NET_NAME_CODE, std::vector<CONNECTION_SUBGRAPH*>> NET_MAP;
 
 /**
  * Calculates the connectivity of a schematic and generates netlists
@@ -255,12 +260,11 @@ public:
      */
     int RunERC( const ERC_SETTINGS& aSettings, bool aCreateMarkers = true );
 
+    const NET_MAP& GetNetMap() const { return m_net_code_to_subgraphs_map; }
+
     // TODO(JE) Remove this when pressure valve is removed
     static bool m_allowRealTime;
 
-    // TODO(JE) firm up API and move to private
-    std::map<int, std::vector<CONNECTION_SUBGRAPH*> > m_net_code_to_subgraphs_map;
-
 private:
 
     std::unordered_set<SCH_ITEM*> m_items;
@@ -291,6 +295,8 @@ private:
     std::unordered_map<wxString,
                        std::vector<CONNECTION_SUBGRAPH*>> m_net_name_to_subgraphs_map;
 
+    NET_MAP m_net_code_to_subgraphs_map;
+
     int m_last_net_code;
 
     int m_last_bus_code;

eeschema/netlist_exporters/netlist_exporter_generic.cpp

@@ -3,7 +3,7 @@
  *
  * Copyright (C) 1992-2013 jp.charras at wanadoo.fr
  * Copyright (C) 2013-2017 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
- * Copyright (C) 1992-2017 KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright (C) 1992-2020 KiCad Developers, see AUTHORS.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -503,26 +503,45 @@ XNODE* NETLIST_EXPORTER_GENERIC::makeListOfNets( bool aUseGraph )
     if( aUseGraph )
     {
         wxASSERT( m_graph );
+        int code = 0;
 
-        for( const auto& it : m_graph->m_net_code_to_subgraphs_map )
+        for( const auto& it : m_graph->GetNetMap() )
         {
             bool     added     = false;
-
+            wxString net_name  = it.first.first;
-            auto code = it.first;
             auto     subgraphs = it.second;
-            auto net_name = subgraphs[0]->GetNetName();
+
+            // Code starts at 1
+            code++;
 
             XNODE* xnode;
+            std::vector<std::pair<SCH_PIN*, SCH_SHEET_PATH>> sorted_items;
 
             for( auto subgraph : subgraphs )
             {
                 auto sheet = subgraph->m_sheet;
 
                 for( auto item : subgraph->m_items )
-                {
                     if( item->Type() == SCH_PIN_T )
+                        sorted_items.emplace_back(
+                                std::make_pair( static_cast<SCH_PIN*>( item ), sheet ) );
+            }
+
+            // Netlist ordering: Net name, then ref des, then pin name
+            std::sort( sorted_items.begin(), sorted_items.end(), []( auto a, auto b ) {
+                        auto ref_a = a.first->GetParentComponent()->GetRef( &a.second );
+                        auto ref_b = b.first->GetParentComponent()->GetRef( &b.second );
+
+                        if( ref_a == ref_b )
+                            return a.first->GetNumber() < b.first->GetNumber();
+
+                        return ref_a < ref_b;
+                    } );
+
+            for( const auto& pair : sorted_items )
             {
-                        auto pin = static_cast<SCH_PIN*>( item );
+                SCH_PIN* pin = pair.first;
+                SCH_SHEET_PATH sheet = pair.second;
 
                 auto refText = pin->GetParentComponent()->GetRef( &sheet );
                 const auto& pinText = pin->GetNumber();
@@ -552,8 +571,7 @@ XNODE* NETLIST_EXPORTER_GENERIC::makeListOfNets( bool aUseGraph )
 
                 if( !pinName.IsEmpty() )
                     xnode->AddAttribute( "pinfunction", pinName );
-                    }
+
-                }
             }
         }
     }

eeschema/sch_connection.cpp

@@ -319,11 +319,16 @@ void SCH_CONNECTION::AppendInfoToMsgPanel( MSG_PANEL_ITEMS& aList ) const
 
     aList.push_back( MSG_PANEL_ITEM( _( "Connection Name" ), UnescapeString( Name() ), BROWN ) );
 
+    // NOTE(JE) Disabling this for now, because net codes are generated in the netlist exporter
+    // in order to avoid sort costs.  It may make sense to just tear out net codes from the
+    // CONNECTION_GRAPH entirely in the future, as they are mostly only useful for netlist exports.
+#if 0
     if( !IsBus() )
     {
         msg.Printf( "%d", m_net_code );
         aList.push_back( MSG_PANEL_ITEM( _( "Net Code" ), msg, BROWN ) );
     }
+#endif
 
     if( auto alias = g_ConnectionGraph->GetBusAlias( m_name ) )
     {