Adjust macOS BOM plugin Python path

eeschema/bom_plugins.cpp

@@ -72,11 +72,33 @@ BOM_GENERATOR_HANDLER::BOM_GENERATOR_HANDLER( const wxString& aFile )
                                   m_file.GetPath(),
                                   m_file.GetFullName(),
                                   getOutputExtension( m_info ) );
+#else
+// For macOS, we want to use the Python we bundle along, rather than just PYTHON_EXECUTABLE.
+// For non-Windows, non-macOS, we can call out to PYTHON_EXECUTABLE.
+#ifdef __APPLE__
+        // python is at Contents/Frameworks/Python.framework/Versions/Current/bin/python3
+
+        // Of course, for macOS, it's not quite that simple, since the relative path
+        // will depend on if we are in standalone mode or not.
+
+        // (If we're going to call out to python like this in other places, we probably want to
+        // think about pulling this into PATHS.)
+
+        wxFileName python( PATHS::GetOSXKicadDataDir(), wxEmptyString );
+        python.RemoveLastDir();
+        python.AppendDir( wxT( "Frameworks" ) );
+        python.AppendDir( wxT( "Python.framework" ) );
+        python.AppendDir( wxT( "Versions" ) );
+        python.AppendDir( wxT( "Current" ) );
+        python.AppendDir( wxT( "bin" ) );
+        python.SetFullName(wxT( "python3" ) );
+
+        wxString interpreter = python.GetFullPath();
 #else
         wxString interpreter = wxString::FromUTF8Unchecked( PYTHON_EXECUTABLE );
-
+#endif
         if( interpreter.IsEmpty() )
-            interpreter = wxT( "python" );
+            interpreter = wxT( "python" ); // For macOS, should we log here? Error here?
 
         m_cmd = wxString::Format( "%s \"%s\" \"%%I\" \"%%O%s\"",
                                   interpreter,