kicad-source/eeschema/symbol_editor/symbol_editor.cpp

/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2019 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright (C) 2008 Wayne Stambaugh <stambaughw@gmail.com>
 * Copyright The 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
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#include <pgm_base.h>
#include <clipboard.h>
#include <confirm.h>
#include <kidialog.h>
#include <kiway.h>
#include <widgets/wx_infobar.h>
#include <tools/symbol_editor_drawing_tools.h>
#include <symbol_edit_frame.h>
#include <symbol_library.h>
#include <template_fieldnames.h>
#include <wildcards_and_files_ext.h>
#include <symbol_lib_table.h>
#include <lib_symbol_library_manager.h>
#include <symbol_tree_pane.h>
#include <project/project_file.h>
#include <widgets/lib_tree.h>
#include <sch_io/kicad_legacy/sch_io_kicad_legacy.h>
#include <sch_io/kicad_sexpr/sch_io_kicad_sexpr.h>
#include <dialogs/dialog_lib_new_symbol.h>
#include <eda_list_dialog.h>
#include <wx/clipbrd.h>
#include <wx/filedlg.h>
#include <wx/log.h>
#include <project_sch.h>
#include <string_utils.h>
#include "symbol_saveas_type.h"

#include <widgets/symbol_filedlg_save_as.h>
#include <io/kicad/kicad_io_utils.h>


void SYMBOL_EDIT_FRAME::UpdateTitle()
{
    wxString title;

    if( GetCurSymbol() && IsSymbolFromSchematic() )
    {
        if( GetScreen() && GetScreen()->IsContentModified() )
            title = wxT( "*" );

        title += m_reference;
        title += wxS( " " ) + _( "[from schematic]" );
    }
    else if( GetCurSymbol() )
    {
        if( GetScreen() && GetScreen()->IsContentModified() )
            title = wxT( "*" );

        title += UnescapeString( GetCurSymbol()->GetLibId().Format() );

        if( m_libMgr && m_libMgr->IsLibraryReadOnly( GetCurLib() ) )
            title += wxS( " " ) + _( "[Read Only Library]" );
    }
    else
    {
        title = _( "[no symbol loaded]" );
    }

    title += wxT( " \u2014 " ) + _( "Symbol Editor" );
    SetTitle( title );
}


void SYMBOL_EDIT_FRAME::SelectActiveLibrary( const wxString& aLibrary )
{
    wxString selectedLib = aLibrary;

    if( selectedLib.empty() )
        selectedLib = SelectLibraryFromList();

    if( !selectedLib.empty() )
        SetCurLib( selectedLib );

    UpdateTitle();
}


bool SYMBOL_EDIT_FRAME::saveCurrentSymbol()
{
    if( GetCurSymbol() )
    {
        if( IsSymbolFromSchematic() )
        {
            SCH_EDIT_FRAME* schframe = (SCH_EDIT_FRAME*) Kiway().Player( FRAME_SCH, false );

            if( !schframe )      // happens when the schematic editor has been closed
            {
                DisplayErrorMessage( this, _( "No schematic currently open." ) );
                return false;
            }
            else
            {
                schframe->SaveSymbolToSchematic( *m_symbol, m_schematicSymbolUUID );
                GetScreen()->SetContentModified( false );
                return true;
            }
        }
        else
        {
            const wxString& libName = GetCurSymbol()->GetLibId().GetLibNickname();

            if( m_libMgr->IsLibraryReadOnly( libName ) )
            {
                wxString msg = wxString::Format( _( "Symbol library '%s' is not writable." ),
                                                 libName );
                wxString msg2 = _( "You must save to a different location." );

                if( OKOrCancelDialog( this, _( "Warning" ), msg, msg2 ) == wxID_OK )
                    return saveLibrary( libName, true );
            }
            else
            {
                return saveLibrary( libName, false );
            }
        }
    }

    return false;
}


bool SYMBOL_EDIT_FRAME::LoadSymbol( const LIB_ID& aLibId, int aUnit, int aBodyStyle )
{
    LIB_ID libId = aLibId;

    // Some libraries can't be edited, so load the underlying chosen symbol
    if( SYMBOL_LIB_TABLE_ROW* lib = m_libMgr->GetLibrary( aLibId.GetLibNickname() ) )
    {
        if( lib->SchLibType() == SCH_IO_MGR::SCH_DATABASE
            || lib->SchLibType() == SCH_IO_MGR::SCH_CADSTAR_ARCHIVE
            || lib->SchLibType() == SCH_IO_MGR::SCH_HTTP )

        {
            try
            {
                LIB_SYMBOL* readOnlySym = PROJECT_SCH::SchSymbolLibTable( &Prj() )->LoadSymbol( aLibId );

                if( readOnlySym && readOnlySym->GetSourceLibId().IsValid() )
                    libId = readOnlySym->GetSourceLibId();
            }
            catch( const IO_ERROR& ioe )
            {
                wxString msg;

                msg.Printf( _( "Error loading symbol %s from library '%s'." ),
                            aLibId.GetUniStringLibId(), aLibId.GetUniStringLibItemName() );
                DisplayErrorMessage( this, msg, ioe.What() );
                return false;
            }
        }
    }

    if( GetCurSymbol() && !IsSymbolFromSchematic()
            && GetCurSymbol()->GetLibId() == libId
            && GetUnit() == aUnit
            && GetBodyStyle() == aBodyStyle )
    {
        return true;
    }

    if( GetCurSymbol() && IsSymbolFromSchematic() && GetScreen()->IsContentModified() )
    {
        if( !HandleUnsavedChanges( this, _( "The current symbol has been modified.  Save changes?" ),
                                   [&]() -> bool
                                   {
                                       return saveCurrentSymbol();
                                   } ) )
        {
            return false;
        }
    }

    SelectActiveLibrary( libId.GetLibNickname() );

    if( LoadSymbolFromCurrentLib( libId.GetLibItemName(), aUnit, aBodyStyle ) )
    {
        m_treePane->GetLibTree()->SelectLibId( libId );
        m_treePane->GetLibTree()->ExpandLibId( libId );

        m_centerItemOnIdle = libId;
        Bind( wxEVT_IDLE, &SYMBOL_EDIT_FRAME::centerItemIdleHandler, this );
        setSymWatcher( &libId );

        return true;
    }

    return false;
}


void SYMBOL_EDIT_FRAME::centerItemIdleHandler( wxIdleEvent& aEvent )
{
    m_treePane->GetLibTree()->CenterLibId( m_centerItemOnIdle );
    Unbind( wxEVT_IDLE, &SYMBOL_EDIT_FRAME::centerItemIdleHandler, this );
}


bool SYMBOL_EDIT_FRAME::LoadSymbolFromCurrentLib( const wxString& aSymbolName, int aUnit,
                                                  int aBodyStyle )
{
    LIB_SYMBOL* symbol = nullptr;

    try
    {
        symbol = PROJECT_SCH::SchSymbolLibTable( &Prj() )->LoadSymbol( GetCurLib(), aSymbolName );
    }
    catch( const IO_ERROR& ioe )
    {
        wxString msg;

        msg.Printf( _( "Error loading symbol %s from library '%s'." ),
                    aSymbolName,
                    GetCurLib() );
        DisplayErrorMessage( this, msg, ioe.What() );
        return false;
    }

    if( !symbol || !LoadOneLibrarySymbolAux( symbol, GetCurLib(), aUnit, aBodyStyle ) )
        return false;

    // Enable synchronized pin edit mode for symbols with interchangeable units
    m_SyncPinEdit = GetCurSymbol()->IsMulti() && !GetCurSymbol()->UnitsLocked();

    ClearUndoRedoList();
    m_toolManager->RunAction( ACTIONS::zoomFitScreen );
    SetShowDeMorgan( GetCurSymbol()->Flatten()->HasAlternateBodyStyle() );

    if( aUnit > 0 )
        RebuildSymbolUnitsList();

    return true;
}


bool SYMBOL_EDIT_FRAME::LoadOneLibrarySymbolAux( LIB_SYMBOL* aEntry, const wxString& aLibrary,
                                                 int aUnit, int aBodyStyle )
{
    bool rebuildMenuAndToolbar = false;

    if( !aEntry || aLibrary.empty() )
        return false;

    if( aEntry->GetName().IsEmpty() )
    {
        wxLogWarning( "Symbol in library '%s' has empty name field.", aLibrary );
        return false;
    }

    m_toolManager->RunAction( ACTIONS::cancelInteractive );

    // Symbols from the schematic are edited in place and not managed by the library manager.
    if( IsSymbolFromSchematic() )
    {
        delete m_symbol;
        m_symbol = nullptr;

        SCH_SCREEN* screen = GetScreen();
        delete screen;
        SetScreen( m_dummyScreen );
        m_isSymbolFromSchematic = false;
        rebuildMenuAndToolbar = true;
    }

    LIB_SYMBOL* lib_symbol = m_libMgr->GetBufferedSymbol( aEntry->GetName(), aLibrary );
    wxCHECK( lib_symbol, false );

    m_unit = aUnit > 0 ? aUnit : 1;
    m_bodyStyle = aBodyStyle > 0 ? aBodyStyle : 1;

    // The buffered screen for the symbol
    SCH_SCREEN* symbol_screen = m_libMgr->GetScreen( lib_symbol->GetName(), aLibrary );

    SetScreen( symbol_screen );
    SetCurSymbol( new LIB_SYMBOL( *lib_symbol ), true );
    SetCurLib( aLibrary );

    if( rebuildMenuAndToolbar )
    {
        ReCreateMenuBar();
        RecreateToolbars();
        GetInfoBar()->Dismiss();
    }

    UpdateTitle();
    RebuildSymbolUnitsList();
    SetShowDeMorgan( GetCurSymbol()->HasAlternateBodyStyle() );

    ClearUndoRedoList();

    if( !IsSymbolFromSchematic() )
    {
        LIB_ID libId = GetCurSymbol()->GetLibId();
        setSymWatcher( &libId );
    }

    // Let tools add things to the view if necessary
    if( m_toolManager )
        m_toolManager->ResetTools( TOOL_BASE::MODEL_RELOAD );

    GetCanvas()->GetView()->UpdateAllItems( KIGFX::ALL );

    // Display the document information based on the entry selected just in
    // case the entry is an alias.
    UpdateMsgPanel();
    Refresh();

    return true;
}


void SYMBOL_EDIT_FRAME::SaveAll()
{
    saveAllLibraries( false );
    m_treePane->GetLibTree()->RefreshLibTree();
}


void SYMBOL_EDIT_FRAME::CreateNewSymbol( const wxString& aInheritFrom )
{
    m_toolManager->RunAction( ACTIONS::cancelInteractive );

    wxArrayString symbolNames;
    wxString lib = getTargetLib();

    if( !m_libMgr->LibraryExists( lib ) )
    {
        lib = SelectLibraryFromList();

        if( !m_libMgr->LibraryExists( lib ) )
            return;
    }

    const auto validator =
            [&]( wxString newName ) -> bool
            {
                if( newName.IsEmpty() )
                {
                    wxMessageBox( _( "Symbol must have a name." ) );
                    return false;
                }

                if( !lib.empty() && m_libMgr->SymbolNameInUse( newName, lib ) )
                {
                    wxString msg;

                    msg.Printf( _( "Symbol '%s' already exists in library '%s'." ),
                                UnescapeString( newName ),
                                lib );

                    KIDIALOG errorDlg( this, msg, _( "Confirmation" ),
                                       wxOK | wxCANCEL | wxICON_WARNING );

                    errorDlg.SetOKLabel( _( "Overwrite" ) );

                    return errorDlg.ShowModal() == wxID_OK;
                }

                return true;
            };

    wxArrayString symbolNamesInLib;
    m_libMgr->GetSymbolNames( lib, symbolNamesInLib );

    DIALOG_LIB_NEW_SYMBOL dlg( this, symbolNamesInLib, aInheritFrom, validator );

    dlg.SetMinSize( dlg.GetSize() );

    if( dlg.ShowModal() == wxID_CANCEL )
        return;

    wxString name = dlg.GetName();

    LIB_SYMBOL new_symbol( name );  // do not create symbol on the heap, it will be buffered soon

    wxString parentSymbolName = dlg.GetParentSymbolName();

    if( parentSymbolName.IsEmpty() )
    {
        new_symbol.GetReferenceField().SetText( dlg.GetReference() );
        new_symbol.SetUnitCount( dlg.GetUnitCount() );

        // Initialize new_symbol.m_TextInside member:
        // if 0, pin text is outside the body (on the pin)
        // if > 0, pin text is inside the body
        if( dlg.GetPinNameInside() )
        {
            new_symbol.SetPinNameOffset( dlg.GetPinTextPosition() );

            if( new_symbol.GetPinNameOffset() == 0 )
                new_symbol.SetPinNameOffset( 1 );
        }
        else
        {
            new_symbol.SetPinNameOffset( 0 );
        }

        ( dlg.GetPowerSymbol() ) ? new_symbol.SetGlobalPower() : new_symbol.SetNormal();
        new_symbol.SetShowPinNumbers( dlg.GetShowPinNumber() );
        new_symbol.SetShowPinNames( dlg.GetShowPinName() );
        new_symbol.LockUnits( !dlg.GetUnitsInterchangeable() );
        new_symbol.SetExcludedFromBOM( !dlg.GetIncludeInBom() );
        new_symbol.SetExcludedFromBoard( !dlg.GetIncludeOnBoard() );

        if( dlg.GetUnitCount() < 2 )
            new_symbol.LockUnits( false );

        new_symbol.SetHasAlternateBodyStyle( dlg.GetAlternateBodyStyle() );
    }
    else
    {
        LIB_SYMBOL* parent = m_libMgr->GetSymbol( parentSymbolName, lib );
        wxCHECK( parent, /* void */ );
        new_symbol.SetParent( parent );

        // Inherit the parent mandatory field attributes.
        for( FIELD_T fieldId : MANDATORY_FIELDS )
        {
            SCH_FIELD* field = new_symbol.GetField( fieldId );
            SCH_FIELD* parentField = parent->GetField( fieldId );

            *field = *parentField;

            switch( fieldId )
            {
            case FIELD_T::REFERENCE:
                // parent's reference already copied
                break;

            case FIELD_T::VALUE:
                if( parent->IsPower() )
                    field->SetText( name );
                break;

            case FIELD_T::FOOTPRINT:
            case FIELD_T::DATASHEET:
                // - footprint might be the same as parent, but might not
                // - datasheet is most likely different
                // - probably best to play it safe and copy neither
                field->SetText( wxEmptyString );
                break;

            default:
                break;
            }

            field->SetParent( &new_symbol );
        }
    }

    m_libMgr->UpdateSymbol( &new_symbol, lib );
    SyncLibraries( false );
    LoadSymbol( name, lib, 1 );

    // must be called after loadSymbol, that calls SetShowDeMorgan, but
    // because the symbol is empty,it looks like it has no alternate body
    // and a derived symbol inherits its parent body.
    if( !new_symbol.GetParent().lock() )
        SetShowDeMorgan( dlg.GetAlternateBodyStyle() );
    else
        SetShowDeMorgan( new_symbol.HasAlternateBodyStyle() );
}


void SYMBOL_EDIT_FRAME::Save()
{
    wxString libName;

    if( IsLibraryTreeShown() )
        libName = GetTreeLIBID().GetUniStringLibNickname();

    if( libName.empty() )
    {
        saveCurrentSymbol();
    }
    else if( m_libMgr->IsLibraryReadOnly( libName ) )
    {
        wxString msg = wxString::Format( _( "Symbol library '%s' is not writable." ),
                                         libName );
        wxString msg2 = _( "You must save to a different location." );

        if( OKOrCancelDialog( this, _( "Warning" ), msg, msg2 ) == wxID_OK )
            saveLibrary( libName, true );
    }
    else
    {
        saveLibrary( libName, false );
    }

    if( IsLibraryTreeShown() )
        m_treePane->GetLibTree()->RefreshLibTree();

    UpdateTitle();
}


void SYMBOL_EDIT_FRAME::SaveLibraryAs()
{
    const wxString& libName = GetTargetLibId().GetLibNickname();

    if( !libName.IsEmpty() )
    {
        saveLibrary( libName, true );
        m_treePane->GetLibTree()->RefreshLibTree();
    }
}


void SYMBOL_EDIT_FRAME::SaveSymbolCopyAs( bool aOpenCopy )
{
    saveSymbolCopyAs( aOpenCopy );

    m_treePane->GetLibTree()->RefreshLibTree();
}


/**
 * Get a list of all the symbols in the parental chain of a symbol,
 * with the "leaf" symbol at the start and the "rootiest" symbol at the end.
 *
 * If the symbol is not an alias, the list will contain only the symbol itself.
 */
static std::vector<LIB_SYMBOL_SPTR> GetParentChain( const LIB_SYMBOL& aSymbol )
{
    std::vector<LIB_SYMBOL_SPTR> chain( { aSymbol.SharedPtr() } );

    while( chain.back()->IsDerived() )
    {
        LIB_SYMBOL_SPTR parent = chain.back()->GetParent().lock();
        chain.push_back( parent );
    }

    return chain;
}


/**
 * Check if a planned overwrite would put a symbol into it's own inheritance chain.
 * This causes infinite loops and other unpleasantness and makes not sense - inheritance
 * must be acyclic.
 *
 * Returns a pair of bools:
 *   - first: true if the symbol would be saved into it's own ancestry
 *   - second: true if the symbol would be saved into it's own descendents
 */
static std::pair<bool, bool> CheckSavingIntoOwnInheritance( LIB_SYMBOL_LIBRARY_MANAGER& aLibMgr,
                                                            LIB_SYMBOL&                 aSymbol,
                                                            const wxString& aNewSymbolName,
                                                            const wxString& aNewLibraryName )
{
    const wxString& oldLibraryName = aSymbol.GetLibId().GetLibNickname();

    // Cannot be intersecting if in different libs
    if( aNewLibraryName != oldLibraryName )
        return { false, false };

    // Or if the target symbol doesn't exist
    if( !aLibMgr.SymbolNameInUse( aNewSymbolName, aNewLibraryName ) )
        return { false, false };

    bool inAncestry = false;
    bool inDescendents = false;

    {
        const std::vector<LIB_SYMBOL_SPTR> parentChainFromUs = GetParentChain( aSymbol );

        // Ignore the leaf symbol (0) - that must match
        for( size_t i = 1; i < parentChainFromUs.size(); ++i )
        {
            // Attempting to overwrite a symbol in the parental chain
            if( parentChainFromUs[i]->GetName() == aNewSymbolName )
            {
                inAncestry = true;
                break;
            }
        }
    }

    {
        LIB_SYMBOL* targetSymbol = aLibMgr.GetSymbol( aNewSymbolName, aNewLibraryName );
        const std::vector<LIB_SYMBOL_SPTR> parentChainFromTarget = GetParentChain( *targetSymbol );
        const wxString                     oldSymbolName = aSymbol.GetName();

        // Ignore the leaf symbol - it'll match if we're saving the symbol
        // to the same name, and that would be OK
        for( size_t i = 1; i < parentChainFromTarget.size(); ++i )
        {
            if( parentChainFromTarget[i]->GetName() == oldSymbolName )
            {
                inDescendents = true;
                break;
            }
        }
    }

    return { inAncestry, inDescendents };
}


/**
 * Get a list of all the symbols in the parental chain of a symbol that have conflicts
 * when transposed to a different library.
 *
 * This doesn't check for dangerous conflicts like saving into a symbol's own inheritance,
 * this is just about which symbols will get overwritten if saved with these names.
 */
static std::vector<wxString> CheckForParentalChainConflicts( LIB_SYMBOL_LIBRARY_MANAGER& aLibMgr,
                                                             LIB_SYMBOL&                 aSymbol,
                                                             const wxString& newSymbolName,
                                                             const wxString& newLibraryName )
{
    std::vector<wxString> conflicts;
    const wxString&       oldLibraryName = aSymbol.GetLibId().GetLibNickname();

    if( newLibraryName == oldLibraryName )
    {
        // Saving into the same library - the only conflict could be the symbol itself
        if( aLibMgr.SymbolNameInUse( newSymbolName, newLibraryName ) )
            conflicts.push_back( newSymbolName );
    }
    else
    {
        // In a different library, check the whole chain
        const std::vector<LIB_SYMBOL_SPTR> parentChain = GetParentChain( aSymbol );

        for( size_t i = 0; i < parentChain.size(); ++i )
        {
            if( i == 0 )
            {
                // This is the leaf symbol which the user actually named
                if( aLibMgr.SymbolNameInUse( newSymbolName, newLibraryName ) )
                    conflicts.push_back( newSymbolName );
            }
            else
            {
                LIB_SYMBOL_SPTR chainSymbol = parentChain[i];

                if( aLibMgr.SymbolNameInUse( chainSymbol->GetName(), newLibraryName ) )
                    conflicts.push_back( chainSymbol->GetName() );
            }
        }
    }

    return conflicts;
}


/**
 * This is a class that handles state involved in saving a symbol copy as a new symbol.
 *
 * This isn't as simple as it sounds, because you also have to copy all the parent symbols
 * (which is a chain affair).
 */
class SYMBOL_SAVE_AS_HANDLER
{
public:
    enum class CONFLICT_STRATEGY
    {
        // Just overwrite any existing symbols in the target library
        OVERWRITE,
        // Add a suffix until we find a name that doesn't conflict
        RENAME,
        // Could have a mode that asks for every one, be then we'll need a fancier
        // SAVE_AS_DIALOG subdialog with Overwrite/Rename/Prompt/Cancel
        // PROMPT
    };

    SYMBOL_SAVE_AS_HANDLER( LIB_SYMBOL_LIBRARY_MANAGER& aLibMgr, CONFLICT_STRATEGY aStrategy,
                            bool aValueFollowsName ) :
            m_libMgr( aLibMgr ),
            m_strategy( aStrategy ),
            m_valueFollowsName( aValueFollowsName )
    {
    }

    bool DoSave( LIB_SYMBOL& symbol, const wxString& aNewSymName, const wxString& aNewLibName )
    {
        std::vector<LIB_SYMBOL_SPTR> parentChain;
        // If we're saving into the same library, we don't need to check the parental chain
        // because we can just keep the same parent symbol
        if( aNewLibName == symbol.GetLibId().GetLibNickname().wx_str() )
            parentChain.push_back( symbol.SharedPtr() );
        else
            parentChain = GetParentChain( symbol );

        std::vector<wxString> newNames;

        // Iterate backwards (i.e. from the root down)
        for( int i = (int) parentChain.size() - 1; i >= 0; --i )
        {
            LIB_SYMBOL_SPTR& oldSymbol = parentChain[i];

            LIB_SYMBOL new_symbol( *oldSymbol );

            wxString newName;
            if( i == 0 )
            {
                // This is the leaf symbol which the user actually named
                newName = aNewSymName;
            }
            else
            {
                // Somewhere in the inheritance chain, use the conflict resolution strategy
                newName = oldSymbol->GetName();
            }

            newName = resolveConflict( newName, aNewLibName );
            new_symbol.SetName( newName );

            if( m_valueFollowsName )
                new_symbol.GetValueField().SetText( newName );

            if( i == (int) parentChain.size() - 1 )
            {
                // This is the root symbol
                // Nothing extra to do, it's just a simple symbol with no parents
            }
            else
            {
                // Get the buffered new copy in the new library (with the name we gave it)
                LIB_SYMBOL* newParent = m_libMgr.GetSymbol( newNames.back(), aNewLibName );

                // We should have stored this already, why didn't we get it back?
                wxASSERT( newParent );
                new_symbol.SetParent( newParent );
            }

            newNames.push_back( newName );
            m_libMgr.UpdateSymbol( &new_symbol, aNewLibName );
        }

        return true;
    }

private:
    wxString resolveConflict( const wxString& proposed, const wxString& aNewLibName ) const
    {
        switch( m_strategy )
        {
        case CONFLICT_STRATEGY::OVERWRITE:
        {
            // In an overwrite strategy, we don't care about conflicts
            return proposed;
        }
        case CONFLICT_STRATEGY::RENAME:
        {
            // In a rename strategy, we need to find a name that doesn't conflict
            int suffix = 1;

            while( true )
            {
                wxString newName = wxString::Format( "%s_%d", proposed, suffix );

                if( !m_libMgr.SymbolNameInUse( newName, aNewLibName ) )
                    return newName;

                ++suffix;
            }
            break;
        }
            // No default
        }

        wxFAIL_MSG( "Invalid conflict strategy" );
        return "";
    }

    LIB_SYMBOL_LIBRARY_MANAGER& m_libMgr;
    CONFLICT_STRATEGY           m_strategy;
    bool                        m_valueFollowsName;
};


enum SAVE_AS_IDS
{
    ID_MAKE_NEW_LIBRARY = wxID_HIGHEST + 1,
    ID_OVERWRITE_CONFLICTS,
    ID_RENAME_CONFLICTS,
};


class SAVE_AS_DIALOG : public EDA_LIST_DIALOG
{
public:
    using SymLibNameValidator =
            std::function<int( const wxString& libName, const wxString& symbolName )>;

    SAVE_AS_DIALOG( SYMBOL_EDIT_FRAME* aParent, const wxString& aSymbolName,
                    const wxString& aLibraryPreselect, SymLibNameValidator aValidator,
                    SYMBOL_SAVE_AS_HANDLER::CONFLICT_STRATEGY& aConflictStrategy ) :
            EDA_LIST_DIALOG( aParent, _( "Save Symbol As" ), false ),
            m_validator( std::move( aValidator ) ), m_conflictStrategy( aConflictStrategy )
    {
        COMMON_SETTINGS*           cfg = Pgm().GetCommonSettings();
        PROJECT_FILE&              project = aParent->Prj().GetProjectFile();
        SYMBOL_LIB_TABLE*          tbl = PROJECT_SCH::SchSymbolLibTable( &Prj() );
        std::vector<wxString>      libNicknames = tbl->GetLogicalLibs();
        wxArrayString              headers;
        std::vector<wxArrayString> itemsToDisplay;

        headers.Add( _( "Nickname" ) );
        headers.Add( _( "Description" ) );

        for( const wxString& nickname : libNicknames )
        {
            if( alg::contains( project.m_PinnedSymbolLibs, nickname )
                || alg::contains( cfg->m_Session.pinned_symbol_libs, nickname ) )
            {
                wxArrayString item;
                item.Add( LIB_TREE_MODEL_ADAPTER::GetPinningSymbol() + nickname );
                item.Add( tbl->GetDescription( nickname ) );
                itemsToDisplay.push_back( item );
            }
        }

        for( const wxString& nickname : libNicknames )
        {
            if( !alg::contains( project.m_PinnedSymbolLibs, nickname )
                    && !alg::contains( cfg->m_Session.pinned_symbol_libs, nickname ) )
            {
                wxArrayString item;
                item.Add( nickname );
                item.Add( tbl->GetDescription( nickname ) );
                itemsToDisplay.push_back( item );
            }
        }

        initDialog( headers, itemsToDisplay, aLibraryPreselect );

        SetListLabel( _( "Save in library:" ) );
        SetOKLabel( _( "Save" ) );

        wxBoxSizer* bNameSizer = new wxBoxSizer( wxHORIZONTAL );

        wxStaticText* label = new wxStaticText( this, wxID_ANY, _( "Name:" ) );
        bNameSizer->Add( label, 0, wxALIGN_CENTER_VERTICAL|wxTOP|wxBOTTOM|wxLEFT, 5 );

        m_symbolNameCtrl = new wxTextCtrl( this, wxID_ANY, aSymbolName );
        bNameSizer->Add( m_symbolNameCtrl, 1, wxALIGN_CENTER_VERTICAL|wxALL, 5 );

        wxButton* newLibraryButton = new wxButton( this, ID_MAKE_NEW_LIBRARY, _( "New Library..." ) );
        m_ButtonsSizer->Prepend( 80, 20 );
        m_ButtonsSizer->Prepend( newLibraryButton, 0, wxALIGN_CENTER_VERTICAL|wxLEFT|wxRIGHT, 10 );

        GetSizer()->Prepend( bNameSizer, 0, wxEXPAND|wxTOP|wxLEFT|wxRIGHT, 5 );

        Bind( wxEVT_BUTTON,
                [this]( wxCommandEvent& )
                {
                    EndModal( ID_MAKE_NEW_LIBRARY );
                }, ID_MAKE_NEW_LIBRARY );

        // Move nameTextCtrl to the head of the tab-order
        if( GetChildren().DeleteObject( m_symbolNameCtrl ) )
            GetChildren().Insert( m_symbolNameCtrl );

        SetInitialFocus( m_symbolNameCtrl );

        SetupStandardButtons();

        Layout();
        GetSizer()->Fit( this );

        Centre();
    }

    wxString GetSymbolName()
    {
        wxString symbolName = m_symbolNameCtrl->GetValue();
        symbolName.Trim( true );
        symbolName.Trim( false );
        symbolName.Replace( " ", "_" );
        return symbolName;
    }

protected:
    bool TransferDataFromWindow() override
    {
        int ret = m_validator( GetTextSelection(), GetSymbolName() );

        if( ret == wxID_CANCEL )
            return false;

        if( ret == ID_OVERWRITE_CONFLICTS )
            m_conflictStrategy = SYMBOL_SAVE_AS_HANDLER::CONFLICT_STRATEGY::OVERWRITE;
        else if( ret == ID_RENAME_CONFLICTS )
            m_conflictStrategy = SYMBOL_SAVE_AS_HANDLER::CONFLICT_STRATEGY::RENAME;

        return true;
    }

private:
    wxTextCtrl*                                m_symbolNameCtrl;
    SymLibNameValidator                        m_validator;
    SYMBOL_SAVE_AS_HANDLER::CONFLICT_STRATEGY& m_conflictStrategy;
};


void SYMBOL_EDIT_FRAME::saveSymbolCopyAs( bool aOpenCopy )
{
    LIB_SYMBOL* symbol = getTargetSymbol();

    if( !symbol )
        return;

    LIB_ID   old_lib_id = symbol->GetLibId();
    wxString symbolName = old_lib_id.GetLibItemName();
    wxString libraryName = old_lib_id.GetLibNickname();
    bool     valueFollowsName = symbol->GetValueField().GetText() == symbolName;
    wxString msg;
    bool     done = false;

    // This is the function that will be called when the user clicks OK in the dialog and checks
    // if the proposed name has problems, and asks for clarification.
    const auto dialogValidatorFunc =
            [&]( const wxString& newLib, const wxString& newName ) -> int
            {
                if( newLib.IsEmpty() )
                {
                    wxMessageBox( _( "A library must be specified." ) );
                    return wxID_CANCEL;
                }

                if( newName.IsEmpty() )
                {
                    wxMessageBox( _( "Symbol must have a name." ) );
                    return wxID_CANCEL;
                }

                if( m_libMgr->IsLibraryReadOnly( newLib ) )
                {
                    msg = wxString::Format( _( "Library '%s' is read-only. Choose a "
                                               "different library to save the symbol '%s' to." ),
                                            newLib, newName );
                    wxMessageBox( msg );
                    return wxID_CANCEL;
                }

                /**
                 * If we save over a symbol that is in the inheritance chain of the symbol we're
                 * saving, we'll end up with a circular inheritance chain, which is bad.
                 */
                const auto& [inAncestry, inDescendents] =
                        CheckSavingIntoOwnInheritance( *m_libMgr, *symbol, newName, newLib );

                if( inAncestry )
                {
                    msg = wxString::Format( _( "Symbol '%s' cannot replace another symbol '%s' "
                                               "that it descends from" ),
                                            symbolName, newName );
                    wxMessageBox( msg );
                    return wxID_CANCEL;
                }

                if( inDescendents )
                {
                    msg = wxString::Format( _( "Symbol '%s' cannot replace another symbol '%s' "
                                               "that is a descendent of it." ),
                                            symbolName, newName );
                    wxMessageBox( msg );
                    return wxID_CANCEL;
                }

                const std::vector<wxString> conflicts =
                        CheckForParentalChainConflicts( *m_libMgr, *symbol, newName, newLib );

                if( conflicts.size() == 1 && conflicts.front() == newName )
                {
                    // The simplest case is when the symbol itself has a conflict
                    msg = wxString::Format( _( "Symbol '%s' already exists in library '%s'. "
                                               "Do you want to overwrite it?" ),
                                            newName, newLib );

                    KIDIALOG errorDlg( this, msg, _( "Confirmation" ),
                                       wxOK | wxCANCEL | wxICON_WARNING );
                    errorDlg.SetOKLabel( _( "Overwrite" ) );

                    return errorDlg.ShowModal() == wxID_OK ? ID_OVERWRITE_CONFLICTS
                                                           : (int) wxID_CANCEL;
                }
                else if( !conflicts.empty() )
                {
                    // If there are conflicts in the parental chain, we need to ask the user
                    // if they want to overwrite all of them.
                    // A more complex UI might allow the user to re-parent the symbol to an
                    // existing symbol in the target lib, or rename all the parents somehow.
                    msg = wxString::Format( _( "The following symbols in the inheritance chain of "
                                               "'%s' already exist in library '%s':\n" ),
                                            symbolName, newLib );

                    for( const wxString& conflict : conflicts )
                        msg += wxString::Format( "  %s\n", conflict );

                    msg += _( "\nDo you want to overwrite all of them, or rename the new symbols?" );

                    KIDIALOG errorDlg( this, msg, _( "Confirmation" ),
                                       wxYES_NO | wxCANCEL | wxICON_WARNING );
                    errorDlg.SetYesNoCancelLabels( _( "Overwrite All" ), _( "Rename All" ),
                                                   _( "Cancel" ) );

                    switch( errorDlg.ShowModal() )
                    {
                    case wxID_YES: return ID_OVERWRITE_CONFLICTS;
                    case wxID_NO: return ID_RENAME_CONFLICTS;
                    default: break;
                    }
                    return wxID_CANCEL;
                }

                return wxID_OK;
            };

    auto strategy = SYMBOL_SAVE_AS_HANDLER::CONFLICT_STRATEGY::OVERWRITE;

    // Keep asking the user for a new name until they give a valid one or cancel the operation
    while( !done )
    {
        SAVE_AS_DIALOG dlg( this, symbolName, libraryName, dialogValidatorFunc, strategy );

        int ret = dlg.ShowModal();

        switch( ret )
        {
        case wxID_CANCEL:
            return;

        case wxID_OK: // No conflicts
        case ID_OVERWRITE_CONFLICTS:
        case ID_RENAME_CONFLICTS:
            symbolName = dlg.GetSymbolName();
            libraryName = dlg.GetTextSelection();

            if( ret == ID_RENAME_CONFLICTS )
                strategy = SYMBOL_SAVE_AS_HANDLER::CONFLICT_STRATEGY::RENAME;

            done = true;
            break;

        case ID_MAKE_NEW_LIBRARY:
        {
            wxFileName newLibrary( AddLibraryFile( true ) );
            libraryName = newLibrary.GetName();
            break;
        }

        default:
            break;
        }
    }

    SYMBOL_SAVE_AS_HANDLER saver( *m_libMgr, strategy, valueFollowsName );

    saver.DoSave( *symbol, symbolName, libraryName );

    SyncLibraries( false );

    if( aOpenCopy )
        LoadSymbol( symbolName, libraryName, 1 );
}


void SYMBOL_EDIT_FRAME::ExportSymbol()
{
    wxString msg;
    LIB_SYMBOL* symbol = getTargetSymbol();

    if( !symbol )
    {
        ShowInfoBarError( _( "There is no symbol selected to save." ) );
        return;
    }

    wxFileName fn;

    fn.SetName( symbol->GetName().Lower() );
    fn.SetExt( FILEEXT::KiCadSymbolLibFileExtension );

    wxFileDialog dlg( this, _( "Export Symbol" ), m_mruPath, fn.GetFullName(),
                      FILEEXT::KiCadSymbolLibFileWildcard(), wxFD_SAVE );

    if( dlg.ShowModal() == wxID_CANCEL )
        return;

    auto strategy = SYMBOL_SAVE_AS_HANDLER::CONFLICT_STRATEGY::OVERWRITE;

    fn = dlg.GetPath();
    fn.MakeAbsolute();

    wxString                    libraryName;
    std::unique_ptr<LIB_SYMBOL> flattenedSymbol = symbol->Flatten();

    for( const wxString& candidate : m_libMgr->GetLibraryNames() )
    {
        if( m_libMgr->GetLibrary( candidate )->GetFullURI( true ) == fn.GetFullPath() )
            libraryName = candidate;
    }

    if( !libraryName.IsEmpty() )
    {
        SYMBOL_SAVE_AS_HANDLER saver( *m_libMgr, strategy, false );

        if( m_libMgr->IsLibraryReadOnly( libraryName ) )
        {
            msg = wxString::Format( _( "Library '%s' is read-only." ), libraryName );
            DisplayError( this, msg );
            return;
        }

        if( m_libMgr->SymbolNameInUse( symbol->GetName(), libraryName ) )
        {
            msg = wxString::Format( _( "Symbol '%s' already exists in library '%s'." ),
                                    symbol->GetName(), libraryName );

            KIDIALOG errorDlg( this, msg, _( "Confirmation" ), wxOK | wxCANCEL | wxICON_WARNING );
            errorDlg.SetOKLabel( _( "Overwrite" ) );
            errorDlg.DoNotShowCheckbox( __FILE__, __LINE__ );

            if( errorDlg.ShowModal() == wxID_CANCEL )
                return;
        }

        saver.DoSave( *flattenedSymbol, symbol->GetName(), libraryName );

        SyncLibraries( false );
        return;
    }

    LIB_SYMBOL* old_symbol = nullptr;
    SCH_IO_MGR::SCH_FILE_T pluginType = SCH_IO_MGR::GuessPluginTypeFromLibPath( fn.GetFullPath() );

    if( pluginType == SCH_IO_MGR::SCH_FILE_UNKNOWN )
        pluginType = SCH_IO_MGR::SCH_KICAD;

    IO_RELEASER<SCH_IO> pi( SCH_IO_MGR::FindPlugin( pluginType ) );

    if( fn.FileExists() )
    {
        try
        {
            old_symbol = pi->LoadSymbol( fn.GetFullPath(), symbol->GetName() );
        }
        catch( const IO_ERROR& ioe )
        {
            msg.Printf( _( "Error occurred attempting to load symbol library file '%s'." ),
                        fn.GetFullPath() );
            DisplayErrorMessage( this, msg, ioe.What() );
            return;
        }

        if( old_symbol )
        {
            msg.Printf( _( "Symbol %s already exists in library '%s'." ),
                        UnescapeString( symbol->GetName() ),
                        fn.GetFullName() );

            KIDIALOG errorDlg( this, msg, _( "Confirmation" ), wxOK | wxCANCEL | wxICON_WARNING );
            errorDlg.SetOKLabel( _( "Overwrite" ) );
            errorDlg.DoNotShowCheckbox( __FILE__, __LINE__ );

            if( errorDlg.ShowModal() == wxID_CANCEL )
                return;
        }
    }

    if( !fn.IsDirWritable() )
    {
        msg.Printf( _( "Insufficient permissions to save library '%s'." ), fn.GetFullPath() );
        DisplayError( this, msg );
        return;
    }

    try
    {
        if( !fn.FileExists() )
            pi->CreateLibrary( fn.GetFullPath() );

        // The flattened symbol is most likely what the user would want.  As some point in
        // the future as more of the symbol library inheritance is implemented, this may have
        // to be changes to save symbols of inherited symbols.
        pi->SaveSymbol( fn.GetFullPath(), flattenedSymbol.release() );
    }
    catch( const IO_ERROR& ioe )
    {
        msg.Printf( _( "Failed to create symbol library file '%s'." ), fn.GetFullPath() );
        DisplayErrorMessage( this, msg, ioe.What() );
        msg.Printf( _( "Error creating symbol library '%s'." ), fn.GetFullName() );
        SetStatusText( msg );
        return;
    }

    m_mruPath = fn.GetPath();

    msg.Printf( _( "Symbol %s saved to library '%s'." ),
                UnescapeString( symbol->GetName() ),
                fn.GetFullPath() );
    SetStatusText( msg );
}


void SYMBOL_EDIT_FRAME::UpdateAfterSymbolProperties( wxString* aOldName )
{
    wxCHECK( m_symbol, /* void */ );

    wxString lib = GetCurLib();

    if( !lib.IsEmpty() && aOldName && *aOldName != m_symbol->GetName() )
    {
        // Test the current library for name conflicts
        if( m_libMgr->SymbolNameInUse( m_symbol->GetName(), lib ) )
        {
            wxString msg = wxString::Format( _( "Symbol name '%s' already in use." ),
                                             UnescapeString( m_symbol->GetName() ) );

            DisplayErrorMessage( this, msg );
            m_symbol->SetName( *aOldName );
        }
        else
        {
            m_libMgr->UpdateSymbolAfterRename( m_symbol, *aOldName, lib );
        }

        // Reselect the renamed symbol
        m_treePane->GetLibTree()->SelectLibId( LIB_ID( lib, m_symbol->GetName() ) );
    }

    RebuildSymbolUnitsList();
    SetShowDeMorgan( GetCurSymbol()->Flatten()->HasAlternateBodyStyle() );
    UpdateTitle();

    // N.B. The view needs to be rebuilt first as the Symbol Properties change may invalidate
    // the view pointers by rebuilting the field table
    RebuildView();
    UpdateMsgPanel();

    OnModify();
}


void SYMBOL_EDIT_FRAME::DeleteSymbolFromLibrary()
{
    std::vector<LIB_ID> toDelete = GetSelectedLibIds();

    if( toDelete.empty() )
        toDelete.emplace_back( GetTargetLibId() );

    for( LIB_ID& libId : toDelete )
    {
        if( m_libMgr->IsSymbolModified( libId.GetLibItemName(), libId.GetLibNickname() )
            && !IsOK( this, wxString::Format( _( "The symbol '%s' has been modified.\n"
                                                 "Do you want to remove it from the library?" ),
                                              libId.GetUniStringLibItemName() ) ) )
        {
            continue;
        }

        if( m_libMgr->HasDerivedSymbols( libId.GetLibItemName(), libId.GetLibNickname() ) )
        {
            wxString msg;

            msg.Printf(
                    _( "The symbol %s is used to derive other symbols.\n"
                       "Deleting this symbol will delete all of the symbols derived from it.\n\n"
                       "Do you wish to delete this symbol and all of its derivatives?" ),
                    libId.GetLibItemName().wx_str() );

            wxMessageDialog::ButtonLabel yesButtonLabel( _( "Delete Symbol" ) );
            wxMessageDialog::ButtonLabel noButtonLabel( _( "Keep Symbol" ) );

            wxMessageDialog dlg( this, msg, _( "Warning" ),
                                 wxYES_NO | wxYES_DEFAULT | wxICON_QUESTION | wxCENTER );
            dlg.SetYesNoLabels( yesButtonLabel, noButtonLabel );

            if( dlg.ShowModal() == wxID_NO )
                continue;
        }

        if( IsCurrentSymbol( libId ) )
            emptyScreen();

        m_libMgr->RemoveSymbol( libId.GetLibItemName(), libId.GetLibNickname() );
    }

    m_treePane->GetLibTree()->RefreshLibTree();
}


void SYMBOL_EDIT_FRAME::CopySymbolToClipboard()
{
    std::vector<LIB_ID> symbols;

    if( GetTreeLIBIDs( symbols ) == 0 )
        return;

    STRING_FORMATTER formatter;

    for( LIB_ID& libId : symbols )
    {
        LIB_SYMBOL* symbol = m_libMgr->GetBufferedSymbol( libId.GetLibItemName(),
                                                          libId.GetLibNickname() );

        if( !symbol )
            continue;

        std::unique_ptr<LIB_SYMBOL> tmp = symbol->Flatten();
        SCH_IO_KICAD_SEXPR::FormatLibSymbol( tmp.get(), formatter );
    }

    std::string prettyData = formatter.GetString();
    KICAD_FORMAT::Prettify( prettyData, true );

    wxLogNull doNotLog; // disable logging of failed clipboard actions

    auto clipboard = wxTheClipboard;
    wxClipboardLocker clipboardLock( clipboard );

    if( !clipboardLock || !clipboard->IsOpened() )
        return;

    auto data = new wxTextDataObject( wxString( prettyData.c_str(), wxConvUTF8 ) );
    clipboard->SetData( data );

    clipboard->Flush();
}


void SYMBOL_EDIT_FRAME::DuplicateSymbol( bool aFromClipboard )
{
    LIB_ID libId = GetTargetLibId();
    wxString lib = libId.GetLibNickname();

    if( !m_libMgr->LibraryExists( lib ) )
        return;

    std::vector<LIB_SYMBOL*> newSymbols;

    if( aFromClipboard )
    {
        std::string clipboardData = GetClipboardUTF8();

        try
        {
            newSymbols = SCH_IO_KICAD_SEXPR::ParseLibSymbols( clipboardData, "Clipboard" );
        }
        catch( IO_ERROR& e )
        {
            wxLogMessage( wxS( "Can not paste: %s" ), e.Problem() );
        }
    }
    else if( LIB_SYMBOL* srcSymbol = m_libMgr->GetBufferedSymbol( libId.GetLibItemName(), lib ) )
    {
        newSymbols.emplace_back( new LIB_SYMBOL( *srcSymbol ) );

        // Derive from same parent.
        if( srcSymbol->IsDerived() )
        {
            if( std::shared_ptr<LIB_SYMBOL> srcParent = srcSymbol->GetParent().lock() )
                newSymbols.back()->SetParent( srcParent.get() );
        }
    }

    if( newSymbols.empty() )
        return;

    for( LIB_SYMBOL* symbol : newSymbols )
    {
        ensureUniqueName( symbol, lib );
        m_libMgr->UpdateSymbol( symbol, lib );

        LoadOneLibrarySymbolAux( symbol, lib, GetUnit(), GetBodyStyle() );
    }

    SyncLibraries( false );
    m_treePane->GetLibTree()->SelectLibId( LIB_ID( lib, newSymbols[0]->GetName() ) );

    for( LIB_SYMBOL* symbol : newSymbols )
        delete symbol;
}


void SYMBOL_EDIT_FRAME::ensureUniqueName( LIB_SYMBOL* aSymbol, const wxString& aLibrary )
{
    if( aSymbol )
    {
        int      i = 1;
        wxString newName = aSymbol->GetName();

        // Append a number to the name until the name is unique in the library.
        while( m_libMgr->SymbolNameInUse( newName, aLibrary ) )
            newName.Printf( "%s_%d", aSymbol->GetName(), i++ );

        aSymbol->SetName( newName );
    }
}


void SYMBOL_EDIT_FRAME::Revert( bool aConfirm )
{
    LIB_ID libId = GetTargetLibId();
    const wxString& libName = libId.GetLibNickname();

    // Empty if this is the library itself that is selected.
    const wxString& symbolName = libId.GetLibItemName();

    wxString msg = wxString::Format( _( "Revert '%s' to last version saved?" ),
                                     symbolName.IsEmpty() ? libName : symbolName );

    if( aConfirm && !ConfirmRevertDialog( this, msg ) )
        return;

    bool reload_currentSymbol = false;
    wxString curr_symbolName = symbolName;

    if( GetCurSymbol() )
    {
        // the library itself is reverted: the current symbol will be reloaded only if it is
        // owned by this library
        if( symbolName.IsEmpty() )
        {
            LIB_ID curr_libId = GetCurSymbol()->GetLibId();
            reload_currentSymbol = libName == curr_libId.GetLibNickname().wx_str();

            if( reload_currentSymbol )
                curr_symbolName = curr_libId.GetUniStringLibItemName();
        }
        else
        {
            reload_currentSymbol = IsCurrentSymbol( libId );
        }
    }

    int unit = m_unit;

    if( reload_currentSymbol )
        emptyScreen();

    if( symbolName.IsEmpty() )
    {
        m_libMgr->RevertLibrary( libName );
    }
    else
    {
        libId = m_libMgr->RevertSymbol( libId.GetLibItemName(), libId.GetLibNickname() );

        m_treePane->GetLibTree()->SelectLibId( libId );
        m_libMgr->ClearSymbolModified( libId.GetLibItemName(), libId.GetLibNickname() );
    }

    if( reload_currentSymbol && m_libMgr->SymbolExists( curr_symbolName, libName ) )
        LoadSymbol( curr_symbolName, libName, unit );

    m_treePane->Refresh();
}


void SYMBOL_EDIT_FRAME::RevertAll()
{
    wxCHECK_RET( m_libMgr, "Library manager object not created." );

    Revert( false );
    m_libMgr->RevertAll();
}


void SYMBOL_EDIT_FRAME::LoadSymbol( const wxString& aAlias, const wxString& aLibrary, int aUnit )
{
    if( GetCurSymbol() && IsSymbolFromSchematic() && GetScreen()->IsContentModified() )
    {
        if( !HandleUnsavedChanges( this, _( "The current symbol has been modified.  Save changes?" ),
                                   [&]() -> bool
                                   {
                                       return saveCurrentSymbol();
                                   } ) )
        {
            return;
        }
    }

    LIB_SYMBOL* symbol = m_libMgr->GetBufferedSymbol( aAlias, aLibrary );

    if( !symbol )
    {
        DisplayError( this, wxString::Format( _( "Symbol %s not found in library '%s'." ),
                                              aAlias,
                                              aLibrary ) );
        m_treePane->GetLibTree()->RefreshLibTree();
        return;
    }

    // Optimize default edit options for this symbol
    // Usually if units are locked, graphic items are specific to each unit
    // and if units are interchangeable, graphic items are common to units
    SYMBOL_EDITOR_DRAWING_TOOLS* tools = GetToolManager()->GetTool<SYMBOL_EDITOR_DRAWING_TOOLS>();
    tools->SetDrawSpecificUnit( symbol->UnitsLocked() );

    LoadOneLibrarySymbolAux( symbol, aLibrary, aUnit, 0 );
}


bool SYMBOL_EDIT_FRAME::saveLibrary( const wxString& aLibrary, bool aNewFile )
{
    wxFileName fn;
    wxString   msg;
    SYMBOL_SAVEAS_TYPE     type = SYMBOL_SAVEAS_TYPE::NORMAL_SAVE_AS;
    SCH_IO_MGR::SCH_FILE_T fileType = SCH_IO_MGR::SCH_FILE_T::SCH_KICAD;
    PROJECT&   prj = Prj();

    m_toolManager->RunAction( ACTIONS::cancelInteractive );

    if( !aNewFile && ( aLibrary.empty() || !PROJECT_SCH::SchSymbolLibTable( &prj )->HasLibrary( aLibrary ) ) )
    {
        ShowInfoBarError( _( "No library specified." ) );
        return false;
    }

    if( aNewFile )
    {
        SEARCH_STACK* search = PROJECT_SCH::SchSearchS( &prj );

        // Get a new name for the library
        wxString default_path = prj.GetRString( PROJECT::SCH_LIB_PATH );

        if( !default_path )
            default_path = search->LastVisitedPath();

        fn.SetName( aLibrary );
        fn.SetExt( FILEEXT::KiCadSymbolLibFileExtension );

        wxString wildcards = FILEEXT::KiCadSymbolLibFileWildcard();

        wxFileDialog dlg( this, wxString::Format( _( "Save Library '%s' As..." ), aLibrary ),
                          default_path, fn.GetFullName(), wildcards,
                          wxFD_SAVE | wxFD_OVERWRITE_PROMPT );

        SYMBOL_FILEDLG_SAVE_AS saveAsHook( type );
        dlg.SetCustomizeHook( saveAsHook );

        if( dlg.ShowModal() == wxID_CANCEL )
            return false;

        fn = dlg.GetPath();

        prj.SetRString( PROJECT::SCH_LIB_PATH, fn.GetPath() );

        if( fn.GetExt().IsEmpty() )
            fn.SetExt( FILEEXT::KiCadSymbolLibFileExtension );

        type = saveAsHook.GetOption();
    }
    else
    {
        fn = PROJECT_SCH::SchSymbolLibTable( &prj )->GetFullURI( aLibrary );
        fileType = SCH_IO_MGR::GuessPluginTypeFromLibPath( fn.GetFullPath() );

        if( fileType == SCH_IO_MGR::SCH_FILE_UNKNOWN )
            fileType = SCH_IO_MGR::SCH_KICAD;
    }

    // Verify the user has write privileges before attempting to save the library file.
    if( !aNewFile && m_libMgr->IsLibraryReadOnly( aLibrary ) )
        return false;

    ClearMsgPanel();

    // Copy .kicad_symb file to .bak.
    if( !backupFile( fn, "bak" ) )
        return false;

    if( !m_libMgr->SaveLibrary( aLibrary, fn.GetFullPath(), fileType ) )
    {
        msg.Printf( _( "Failed to save changes to symbol library file '%s'." ),
                    fn.GetFullPath() );
        DisplayErrorMessage( this, _( "Error Saving Library" ), msg );
        return false;
    }

    if( !aNewFile )
    {
        m_libMgr->ClearLibraryModified( aLibrary );

        // Update the library modification time so that we don't reload based on the watcher
        if( aLibrary == getTargetLib() )
            SetSymModificationTime( fn.GetModificationTime() );
    }
    else
    {
        bool resyncLibTree = false;
        wxString originalLibNickname = getTargetLib();
        wxString forceRefresh;

        switch( type )
        {
        case SYMBOL_SAVEAS_TYPE::REPLACE_TABLE_ENTRY:
            resyncLibTree = replaceLibTableEntry( originalLibNickname, fn.GetFullPath() );
            forceRefresh = originalLibNickname;
            break;

        case SYMBOL_SAVEAS_TYPE::ADD_GLOBAL_TABLE_ENTRY:
            resyncLibTree = addLibTableEntry( fn.GetFullPath() );
            break;

        case SYMBOL_SAVEAS_TYPE::ADD_PROJECT_TABLE_ENTRY:
            resyncLibTree = addLibTableEntry( fn.GetFullPath(), PROJECT_LIB_TABLE );
            break;

        default:
            break;
        }

        if( resyncLibTree )
        {
            FreezeLibraryTree();
            SyncLibraries( true, false, forceRefresh );
            ThawLibraryTree();
        }
    }

    ClearMsgPanel();
    msg.Printf( _( "Symbol library file '%s' saved." ), fn.GetFullPath() );
    RebuildSymbolUnitsList();

    return true;
}


bool SYMBOL_EDIT_FRAME::saveAllLibraries( bool aRequireConfirmation )
{
    wxString msg, msg2;
    bool     doSave = true;
    int      dirtyCount = 0;
    bool     applyToAll = false;
    bool     retv = true;

    for( const wxString& libNickname : m_libMgr->GetLibraryNames() )
    {
        if( m_libMgr->IsLibraryModified( libNickname ) )
            dirtyCount++;
    }

    for( const wxString& libNickname : m_libMgr->GetLibraryNames() )
    {
        if( m_libMgr->IsLibraryModified( libNickname ) )
        {
            if( aRequireConfirmation && !applyToAll )
            {
                msg.Printf( _( "Save changes to '%s' before closing?" ), libNickname );

                switch( UnsavedChangesDialog( this, msg, dirtyCount > 1 ? &applyToAll : nullptr ) )
                {
                case wxID_YES: doSave = true;  break;
                case wxID_NO:  doSave = false; break;
                default:
                case wxID_CANCEL: return false;
                }
            }

            if( doSave )
            {
                // If saving under existing name fails then do a Save As..., and if that
                // fails then cancel close action.
                if( m_libMgr->IsLibraryReadOnly( libNickname ) )
                {
                    msg.Printf( _( "Symbol library '%s' is not writable." ), libNickname );
                    msg2 = _( "You must save to a different location." );

                    if( dirtyCount == 1 )
                    {
                        if( OKOrCancelDialog( this, _( "Warning" ), msg, msg2 ) != wxID_OK )
                        {
                            retv = false;
                            continue;
                        }
                    }
                    else
                    {
                        m_infoBar->Dismiss();
                        m_infoBar->ShowMessageFor( msg + wxS( "  " ) + msg2,
                                                   2000, wxICON_EXCLAMATION );

                        while( m_infoBar->IsShownOnScreen() )
                            wxSafeYield();

                        retv = false;
                        continue;
                    }
                }
                else if( saveLibrary( libNickname, false ) )
                {
                    continue;
                }

                if( !saveLibrary( libNickname, true ) )
                    retv = false;
            }
        }
    }

    UpdateTitle();
    return retv;
}


void SYMBOL_EDIT_FRAME::UpdateSymbolMsgPanelInfo()
{
    EDA_DRAW_FRAME::ClearMsgPanel();

    if( !m_symbol )
        return;

    wxString msg = m_symbol->GetName();

    AppendMsgPanel( _( "Name" ), UnescapeString( msg ), 8 );

    if( m_symbol->IsDerived() )
    {
        LIB_SYMBOL_SPTR parent = m_symbol->GetParent().lock();

        msg = parent ? parent->GetName() : _( "Undefined!" );
        AppendMsgPanel( _( "Parent" ), UnescapeString( msg ), 8 );
    }

    static wxChar UnitLetter[] = wxT( "?ABCDEFGHIJKLMNOPQRSTUVWXYZ" );
    msg = UnitLetter[m_unit];

    AppendMsgPanel( _( "Unit" ), msg, 8 );

    if( m_bodyStyle == BODY_STYLE::DEMORGAN )
        msg = _( "Alternate" );
    else if( m_bodyStyle == BODY_STYLE::BASE )
        msg = _( "Standard" );
    else
        msg = wxT( "?" );

    AppendMsgPanel( _( "Body" ), msg, 8 );

    if( m_symbol->IsGlobalPower() )
        msg = _( "Power Symbol" );
    else if( m_symbol->IsLocalPower() )
        msg = _( "Power Symbol (Local)" );
    else
        msg = _( "Symbol" );

    AppendMsgPanel( _( "Type" ), msg, 8 );
    AppendMsgPanel( _( "Description" ), m_symbol->GetDescription(), 8 );
    AppendMsgPanel( _( "Keywords" ), m_symbol->GetKeyWords() );
    AppendMsgPanel( _( "Datasheet" ), m_symbol->GetDatasheetField().GetText() );
}