Add an Align to Y Axis Option to the CLI Arrange

The CLI turned "align to Y axis" on for every i3 printer with no way to opt
out. With rotations forbidden the pre-rotation is the result, so every object
ends up turned 90 degrees from how it was loaded. The GUI defaults the
checkbox the same way for i3 printers, but lets the user untick it.

Add --align-to-y-axis. When it is not given the printer-structure rule still
applies, so existing calls are unchanged; the CLI's own options are filled
with defaults after parsing, so the keys the user typed are remembered to
tell the two apart.

src/OrcaSlicer.cpp

@@ -28,6 +28,7 @@
 #include <csignal>
 #include <atomic>
 #include <new>
+#include <optional>
 
 #if defined(__linux__) || defined(__LINUX__)
 #include <condition_variable>
@@ -1614,6 +1615,10 @@ int CLI::run(int argc, char **argv)
     ConfigOptionBool* allow_rotations_option = m_config.option<ConfigOptionBool>("allow_rotations");
     if (allow_rotations_option)
         allow_rotations = allow_rotations_option->value;
+    // Only an explicit --align-to-y-axis overrides the printer-structure default.
+    std::optional<bool> align_to_y_axis;
+    if (m_given_option_keys.count("align_to_y_axis") > 0)
+        align_to_y_axis = m_config.opt_bool("align_to_y_axis");
 
     ConfigOptionBool* skip_modified_gcodes_option = m_config.option<ConfigOptionBool>("skip_modified_gcodes");
     if (skip_modified_gcodes_option)
@@ -5298,7 +5303,9 @@ int CLI::run(int argc, char **argv)
                     arrange_cfg.bed_shrink_x = BED_SHRINK_SEQ_PRINT;
                     arrange_cfg.bed_shrink_y = BED_SHRINK_SEQ_PRINT;
                 }
-                if (auto printer_structure_opt = m_print_config.option<ConfigOptionEnum<PrinterStructure>>("printer_structure")) {
+                if (align_to_y_axis.has_value()) {
+                    arrange_cfg.align_to_y_axis = *align_to_y_axis;
+                } else if (auto printer_structure_opt = m_print_config.option<ConfigOptionEnum<PrinterStructure>>("printer_structure")) {
                     arrange_cfg.align_to_y_axis = (printer_structure_opt->value == PrinterStructure::psI3);
                 }
 
@@ -5748,7 +5755,9 @@ int CLI::run(int argc, char **argv)
                     arrange_cfg.bed_shrink_x = BED_SHRINK_SEQ_PRINT;
                     arrange_cfg.bed_shrink_y = BED_SHRINK_SEQ_PRINT;
                 }
-                if (auto printer_structure_opt = m_print_config.option<ConfigOptionEnum<PrinterStructure>>("printer_structure")) {
+                if (align_to_y_axis.has_value()) {
+                    arrange_cfg.align_to_y_axis = *align_to_y_axis;
+                } else if (auto printer_structure_opt = m_print_config.option<ConfigOptionEnum<PrinterStructure>>("printer_structure")) {
                     arrange_cfg.align_to_y_axis = (printer_structure_opt->value == PrinterStructure::psI3);
                 }
 
@@ -7943,6 +7952,8 @@ bool CLI::setup(int argc, char **argv)
     for (std::string &input_file : m_input_files)
         input_file = resolve_cli_input_path(input_file);
 
+    m_given_option_keys.insert(opt_order.begin(), opt_order.end());
+
     // Parse actions and transform options.
     for (auto const &opt_key : opt_order) {
         if (cli_actions_config_def.has(opt_key))

src/OrcaSlicer.hpp

@@ -1,6 +1,8 @@
 #ifndef SLIC3R_HPP
 #define SLIC3R_HPP
 
+#include <set>
+
 #include "libslic3r/Config.hpp"
 #include "libslic3r/Model.hpp"
 
@@ -113,6 +115,8 @@ private:
     std::vector<std::string>    m_input_files;
     std::vector<std::string>    m_actions;
     std::vector<std::string>    m_transforms;
+    // Options the user typed; setup() fills the CLI's own options with defaults afterwards.
+    std::set<std::string>       m_given_option_keys;
     std::vector<Model>          m_models;
 
     bool setup(int argc, char **argv);

src/libslic3r/PrintConfig.cpp

@@ -12347,6 +12347,12 @@ CLIMiscConfigDef::CLIMiscConfigDef()
     def->tooltip = L("If enabled, Arrange will allow rotation when placing objects.");
     def->set_default_value(new ConfigOptionBool(true));
 
+    def = this->add("align_to_y_axis", coBool);
+    def->label = L("Align to Y axis when arranging");
+    def->tooltip = L("If enabled, Arrange will turn each object so its long side runs along the Y axis before placing it. "
+                     "When not given, it is on for i3 printers and off for the others, as in the GUI.");
+    def->set_default_value(new ConfigOptionBool(false));
+
     def = this->add("avoid_extrusion_cali_region", coBool);
     def->label = L("Avoid extrusion calibrate region when arranging");
     def->tooltip = L("If enabled, Arrange will avoid extrusion calibrate region when placing objects.");