Fix an issue when reading a gpcb footprint library when a .fp file has a problem.

Now the full library loading is not aborted (and the other libraries in list are also loaded).
Only the bad .fp file(s) is not loaded.
Mainly, a .fp file load error does not throw a library load error, and this is a temporary fix.
But throwing a library error when a .fp file cannot be loaded is worst (you even cannot import a good .fp file).

pcbnew/gpcb_plugin.cpp

@@ -287,6 +287,9 @@ wxDateTime GPCB_FPL_CACHE::GetLibModificationTime() const
 
 void GPCB_FPL_CACHE::Load()
 {
+    // Note: like our .pretty footprint libraries, the gpcb footprint libraries are folders,
+    // and the footprints are the .fp files inside this folder.
+
     wxDir dir( m_lib_path.GetPath() );
 
     if( !dir.IsOpened() )
@@ -301,18 +304,32 @@ void GPCB_FPL_CACHE::Load()
     if( !dir.GetFirst( &fpFileName, wildcard, wxDIR_FILES ) )
         return;
 
+    wxString cacheErrorMsg;
+
     do
     {
         wxFileName fn( m_lib_path.GetPath(), fpFileName );
 
+        // Queue I/O errors so only files that fail to parse don't get loaded.
+        try
+        {
             // reader now owns fp, will close on exception or return
             FILE_LINE_READER reader( fn.GetFullPath() );
+
             std::string      name = TO_UTF8( fn.GetName() );
             MODULE*          footprint = parseMODULE( &reader );
 
             // The footprint name is the file name without the extension.
             footprint->SetFPID( LIB_ID( fn.GetName() ) );
             m_modules.insert( name, new GPCB_FPL_CACHE_ITEM( footprint, fn.GetName() ) );
+        }
+        catch( const IO_ERROR& ioe )
+        {
+            if( !cacheErrorMsg.IsEmpty() )
+                cacheErrorMsg += "\n";
+
+            cacheErrorMsg += ioe.What();
+        }
 
     } while( dir.GetNext( &fpFileName ) );
 
@@ -320,6 +337,11 @@ void GPCB_FPL_CACHE::Load()
     // cache snapshot was made, so that in a networked environment we will
     // reload the cache as needed.
     m_mod_time = GetLibModificationTime();
+
+#if 0
+    if( !cacheErrorMsg.IsEmpty() )
+        THROW_IO_ERROR( cacheErrorMsg );
+#endif
 }
 
 
@@ -416,7 +438,10 @@ MODULE* GPCB_FPL_CACHE::parseMODULE( LINE_READER* aLineReader ) throw( IO_ERROR,
 
 
     if( aLineReader->ReadLine() == NULL )
-        THROW_IO_ERROR( "unexpected end of file" );
+    {
+        msg = aLineReader->GetSource() + ": empty file";
+        THROW_IO_ERROR( msg );
+    }
 
     parameters.Clear();
     parseParameters( parameters, aLineReader );
@@ -965,6 +990,7 @@ wxArrayString GPCB_PLUGIN::FootprintEnumerate( const wxString&   aLibraryPath,
     init( aProperties );
 
 #if 1                         // Set to 0 to only read directory contents, not load cache.
+
     cacheLib( aLibraryPath );
 
     const MODULE_MAP& mods = m_cache->GetModules();

pcbnew/librairi.cpp

@@ -92,7 +92,6 @@ static const wxString INFO_LEGACY_LIB_WARN_DELETE(
             "before deleting a footprint" ) );
 
 static const wxString ModLegacyExportFileWildcard( _( "Legacy foot print export files (*.emp)|*.emp" ) );
-static const wxString ModImportFileWildcard( _( "GPcb foot print files (*)|*" ) );
 
 
 #define EXPORT_IMPORT_LASTPATH_KEY wxT( "import_last_path" )
@@ -103,15 +102,14 @@ static const wxString ModImportFileWildcard( _( "GPcb foot print files (*)|*" )
  * @param aParent - parent window for the dialog
  * @param aLastPath - last opened path
  */
-static wxFileName prompt_for_module( wxWindow* aParent, const wxString& aLastPath )
+static wxFileName getFootprintFilenameFromUser( wxWindow* aParent, const wxString& aLastPath )
 {
-    static int lastFilterIndex = 0;
+    static int lastFilterIndex = 0;     // To store the last choice during a session.
     wxString wildCard;
 
     wildCard << wxGetTranslation( KiCadFootprintLibFileWildcard ) << wxChar( '|' )
              << wxGetTranslation( ModLegacyExportFileWildcard ) << wxChar( '|' )
-             << wxGetTranslation( ModImportFileWildcard ) << wxChar( '|' )
+             << wxGetTranslation( GedaPcbFootprintLibFileWildcard ) << wxChar( '|' );
-             << wxGetTranslation( GedaPcbFootprintLibFileWildcard );
 
     wxFileDialog dlg( aParent, FMT_IMPORT_MODULE, aLastPath, wxEmptyString, wildCard,
             wxFD_OPEN | wxFD_FILE_MUST_EXIST );
@@ -263,7 +261,7 @@ MODULE* FOOTPRINT_EDIT_FRAME::Import_Module()
     if( config )
         config->Read( EXPORT_IMPORT_LASTPATH_KEY, &lastOpenedPathForLoading );
 
-    wxFileName fn = prompt_for_module( this, lastOpenedPathForLoading );
+    wxFileName fn = getFootprintFilenameFromUser( this, lastOpenedPathForLoading );
 
     if( !fn.IsOk() )
         return NULL;
@@ -292,8 +290,7 @@ MODULE* FOOTPRINT_EDIT_FRAME::Import_Module()
         return NULL;
     }
 
-    MODULE*    module;
+    MODULE*    module = NULL;
-    wxString   errMessage;
 
     try
     {
@@ -310,6 +307,13 @@ MODULE* FOOTPRINT_EDIT_FRAME::Import_Module()
     catch( const IO_ERROR& ioe )
     {
         DisplayError( this, ioe.What() );
+
+        // if the footprint is not loaded, exit.
+        // However, even if an error happens, it can be loaded, because in KICAD and GPCB format,
+        // a fp library is a set of separate files, and the error(s) are not necessary when
+        // reading the selected file
+
+        if( !module )
             return NULL;
     }