Fixed a bug in initialization of some StaticPrintConfig derived classes.

Merged implementation of support for "Octoprint-Cancelobject" #972
thanks @supermerill

src/libslic3r/GCode.cpp

@@ -1622,6 +1622,8 @@ void GCode::process_layer(
 
                 unsigned int copy_id = 0;
                 for (const Point &copy : copies) {
+                    if (this->config().gcode_label_objects)
+                        gcode += std::string("; printing object ") + print_object->model_object()->name + " id:" + std::to_string(layer_id) + " copy " + std::to_string(copy_id) + "\n";
                     // When starting a new object, use the external motion planner for the first travel move.
                     std::pair<const PrintObject*, Point> this_object_copy(print_object, copy);
                     if (m_last_obj_copy != this_object_copy)
@@ -1646,6 +1648,8 @@ void GCode::process_layer(
                             gcode += this->extrude_infill(print,by_region_specific);
                         }
                     }
+                    if (this->config().gcode_label_objects)
+						gcode += std::string("; stop printing object ") + print_object->model_object()->name + " id:" + std::to_string(layer_id) + " copy " + std::to_string(copy_id) + "\n";
                     ++ copy_id;
                 }
             }

src/libslic3r/Print.cpp

@@ -127,6 +127,7 @@ bool Print::invalidate_state_by_config_options(const std::vector<t_config_option
         "first_layer_speed",
         "gcode_comments",
         "gcode_flavor",
+        "gcode_label_objects",
         "infill_acceleration",
         "layer_gcode",
         "min_fan_speed",

src/libslic3r/PrintConfig.cpp

@@ -930,6 +930,15 @@ void PrintConfigDef::init_fff_params()
     def->mode = comExpert;
     def->default_value = new ConfigOptionEnum<GCodeFlavor>(gcfRepRap);
 
+    def = this->add("gcode_label_objects", coBool);
+    def->label = "Label objects";
+    def->tooltip = "Enable this to add comments into the G-Code labeling print moves with what object they belong to,"
+                   " which is useful for the Octoprint CancelObject plugin. This settings is NOT compatible with "
+                   "Single Extruder Multi Material setup and Wipe into Object / Wipe into Infill.";
+    def->cli = "gcode-label-objects!";
+    def->mode = comAdvanced;
+    def->default_value = new ConfigOptionBool(0);
+
     def = this->add("high_current_on_filament_swap", coBool);
     def->label = L("High extruder current on filament swap");
     def->tooltip = L("It may be beneficial to increase the extruder motor current during the filament exchange"

src/libslic3r/PrintConfig.hpp

@@ -619,6 +619,7 @@ public:
     ConfigOptionStrings             filament_ramming_parameters;
     ConfigOptionBool                gcode_comments;
     ConfigOptionEnum<GCodeFlavor>   gcode_flavor;
+    ConfigOptionBool                gcode_label_objects;
     ConfigOptionString              layer_gcode;
     ConfigOptionFloat               max_print_speed;
     ConfigOptionFloat               max_volumetric_speed;
@@ -690,6 +691,7 @@ protected:
         OPT_PTR(filament_ramming_parameters);
         OPT_PTR(gcode_comments);
         OPT_PTR(gcode_flavor);
+        OPT_PTR(gcode_label_objects);
         OPT_PTR(layer_gcode);
         OPT_PTR(max_print_speed);
         OPT_PTR(max_volumetric_speed);
@@ -730,7 +732,7 @@ protected:
 class PrintConfig : public MachineEnvelopeConfig, public GCodeConfig
 {
     STATIC_PRINT_CONFIG_CACHE_DERIVED(PrintConfig)
-    PrintConfig() : GCodeConfig(0) { initialize_cache(); *this = s_cache_PrintConfig.defaults(); }
+	PrintConfig() : MachineEnvelopeConfig(0), GCodeConfig(0) { initialize_cache(); *this = s_cache_PrintConfig.defaults(); }
 public:
     double                          min_object_distance() const;
     static double                   min_object_distance(const ConfigBase *config);
@@ -808,7 +810,7 @@ public:
     ConfigOptionFloat               exp_time_first;
 
 protected:
-    PrintConfig(int) : GCodeConfig(1) {}
+	PrintConfig(int) : MachineEnvelopeConfig(1), GCodeConfig(1) {}
     void initialize(StaticCacheBase &cache, const char *base_ptr)
     {
         this->MachineEnvelopeConfig::initialize(cache, base_ptr);

src/slic3r/GUI/Preset.cpp

@@ -336,7 +336,7 @@ const std::vector<std::string>& Preset::print_options()
         "support_material_synchronize_layers", "support_material_angle", "support_material_interface_layers", 
         "support_material_interface_spacing", "support_material_interface_contact_loops", "support_material_contact_distance", 
         "support_material_buildplate_only", "dont_support_bridges", "notes", "complete_objects", "extruder_clearance_radius", 
-        "extruder_clearance_height", "gcode_comments", "output_filename_format", "post_process", "perimeter_extruder", 
+        "extruder_clearance_height", "gcode_comments", "gcode_label_objects", "output_filename_format", "post_process", "perimeter_extruder", 
         "infill_extruder", "solid_infill_extruder", "support_material_extruder", "support_material_interface_extruder", 
         "ooze_prevention", "standby_temperature_delta", "interface_shells", "extrusion_width", "first_layer_extrusion_width", 
         "perimeter_extrusion_width", "external_perimeter_extrusion_width", "infill_extrusion_width", "solid_infill_extrusion_width", 

src/slic3r/GUI/Tab.cpp

@@ -1095,6 +1095,7 @@ void TabPrint::build()
 
 		optgroup = page->new_optgroup(_(L("Output file")));
 		optgroup->append_single_option_line("gcode_comments");
+		optgroup->append_single_option_line("gcode_label_objects");
 		option = optgroup->get_option("output_filename_format");
 		option.opt.full_width = true;
 		optgroup->append_single_option_line(option);