feat(reflection): Bring in new libconfig

This version of fourdst (v0.9.14) brings in the version libconfig which
includes reflection based config filed (v2.0.2).

This is a breaking change as any code which used versions of libconfig <
v2.0.0 will no longer function when linked against this version of
fourdst

src-pybind/bindings.cpp

@@ -21,6 +21,6 @@ PYBIND11_MODULE(_phys, m) {
     auto constMod = m.def_submodule("constants", "Constants-module bindings");
     register_const_bindings(constMod);
 
-    auto configMod = m.def_submodule("config", "Configuration-module bindings");
-    register_config_bindings(configMod);
-}
+    const auto configMod = m.def_submodule("config", "Configuration-module bindings");
+    register_config_enums(configMod);
+}

src-pybind/config/bindings.cpp

@@ -1,55 +1,17 @@
-#include <pybind11/pybind11.h>
-#include <pybind11/stl.h> // Needed for vectors, maps, sets, strings
-#include <pybind11/stl_bind.h> // Needed for binding std::vector, std::map etc if needed directly
-
-#include <string>
 #include "bindings.h"
 
+#include <pybind11/pybind11.h>
 #include "fourdst/config/config.h"
 
-namespace py = pybind11;
+void register_config_enums(const pybind11::module_& m) {
+    using namespace fourdst::config;
+    pybind11::enum_<ConfigState>(m, "ConfigState")
+        .value("DEFAULT", ConfigState::DEFAULT)
+        .value("LOADED_FROM_FILE", ConfigState::LOADED_FROM_FILE)
+        .export_values();
 
-// Helper function template for binding Config::get
-template <typename T>
-void def_config_get(py::module &m) {
-    m.def("get",
-          [](const std::string &key, T defaultValue) {
-              return fourdst::config::Config::getInstance().get<T>(key, defaultValue);
-          },
-          py::arg("key"), py::arg("defaultValue"),
-          "Get configuration value (type inferred from default)");
-}
-
-void register_config_bindings(pybind11::module &config_submodule) {
-    def_config_get<int>(config_submodule);
-    def_config_get<double>(config_submodule);
-    def_config_get<std::string>(config_submodule);
-    def_config_get<bool>(config_submodule);
-
-    config_submodule.def("loadConfig",
-        [](const std::string& configFilePath) {
-            return fourdst::config::Config::getInstance().loadConfig(configFilePath);
-        },
-        py::arg("configFilePath"),
-        "Load configuration from a YAML file.");
-
-    config_submodule.def("has",
-        [](const std::string &key) {
-            return fourdst::config::Config::getInstance().has(key);
-        },
-        py::arg("key"),
-        "Check if a key exists in the configuration.");
-
-    config_submodule.def("keys",
-        []() {
-            return py::cast(fourdst::config::Config::getInstance().keys());
-        },
-        "Get a list of all configuration keys.");
-
-    config_submodule.def("__repr__",
-        []() {
-            std::ostringstream oss;
-            oss << fourdst::config::Config::getInstance(); // Use the existing operator<<
-            return std::string("<fourdsse_bindings.config module accessing C++ Singleton>\n") + oss.str();
-        });
+    pybind11::enum_<RootNameLoadPolicy>(m, "RootNameLoadPolicy")
+        .value("FROM_FILE", RootNameLoadPolicy::FROM_FILE)
+        .value("KEEP_CURRENT", RootNameLoadPolicy::KEEP_CURRENT)
+        .export_values();
 }

src-pybind/config/bindings.h

@@ -1,5 +1,26 @@
 #pragma once
 
 #include <pybind11/pybind11.h>
+#include "fourdst/config/config.h"
 
-void register_config_bindings(pybind11::module &config_submodule);
+#include <string>
+#include <format>
+
+void register_config_enums(const pybind11::module_& m);
+
+template <typename ConfigType>
+pybind11::class_<ConfigType> bind_config_specialization(pybind11::module_& m , const std::string& name) {
+    return pybind11::class_<ConfigType>(m, name.c_str())
+        .def(pybind11::init<>())
+        .def("load", &ConfigType::load, pybind11::arg("file_path"), "Load configuration from a file.")
+        .def("save", &ConfigType::save, pybind11::arg("file_path") = "config_output.toml", "Save configuration to a file.")
+        .def("save_schema", &ConfigType::save_schema, pybind11::arg("directory") = ".", "Save the configuration schema to a directory.")
+        .def("get_state", &ConfigType::get_state, "Get the current state of the configuration.")
+        .def("describe_state", &ConfigType::describe_state, "Get the current state of the configuration.")
+        .def("__repr__",
+             [](const ConfigType &cfg) -> std::string {
+                return std::format("{}", cfg);
+             }
+        );
+
+}

src-pybind/meson.build

@@ -1,4 +0,0 @@
-subdir('composition')
-subdir('constants')
-subdir('config')
-