Parameters loaded from lua file without rebuilding

CMakeLists.txt

@@ -21,6 +21,9 @@ deal_ii_initialize_cached_variables()
 
 find_package(OpenMP REQUIRED)
 
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(LUA REQUIRED lua5.4)
+
 # -------------------------
 
 add_library(nufi_lib
@@ -31,12 +34,14 @@ add_library(nufi_lib
 
 target_include_directories(nufi_lib PUBLIC
   ${CMAKE_SOURCE_DIR}
+  ${LUA_INCLUDE_DIRS}
 )
 
 deal_ii_setup_target(nufi_lib)
 
 target_link_libraries(nufi_lib
   OpenMP::OpenMP_CXX
+  ${LUA_LIBRARIES}
 ) 
 
 target_compile_options(nufi_lib PRIVATE -O3 -g -fno-omit-frame-pointer)

nufi/lua_config.h

@@ -0,0 +1,84 @@
+#pragma once
+
+#include <iostream>
+#include <stdexcept>
+#include <string>
+#include <variant>
+
+extern "C" {
+#include <lauxlib.h>
+#include <lua.h>
+#include <lualib.h>
+}
+
+using LuaValue = std::variant<int, float, bool, std::string>;
+
+class LuaConfig {
+public:
+  LuaConfig(const std::string &filePath, const std::string &tableName) {
+    L = luaL_newstate();
+    luaL_openlibs(L);
+
+    if (luaL_dofile(L, filePath.c_str()) != LUA_OK) {
+      std::string err = lua_tostring(L, -1);
+      lua_close(L);
+      throw std::runtime_error("Error loading Lua file: " + err);
+    }
+
+    lua_getglobal(L, tableName.c_str());
+    if (!lua_istable(L, -1)) {
+      lua_close(L);
+      throw std::runtime_error("'" + tableName +
+                               "' is not a table (or missing)");
+    }
+  }
+
+  ~LuaConfig() {
+    if (L)
+      lua_close(L);
+  }
+
+  LuaConfig(const LuaConfig &) = delete;
+  LuaConfig &operator=(const LuaConfig &) = delete;
+
+  template <typename T> T get(const std::string &key) const {
+    lua_getfield(L, -1, key.c_str());
+    if (lua_isnil(L, -1)) {
+      lua_pop(L, 1);
+      throw std::runtime_error("Missing key: " + key);
+    }
+    T value = extract<T>(key);
+    lua_pop(L, 1);
+    std::cout << "[LuaConfig] " << key << " = " << value << "\n";
+    return value;
+  }
+
+private:
+  lua_State *L = nullptr;
+
+  template <typename T> T extract(const std::string &key) const {
+    if constexpr (std::is_same_v<T, int>) {
+      if (!lua_isinteger(L, -1) && !lua_isnumber(L, -1))
+        throw std::runtime_error("Key '" + key + "' is not a number");
+      return static_cast<int>(lua_tointeger(L, -1));
+    } else if constexpr (std::is_same_v<T, float>) {
+      if (!lua_isnumber(L, -1))
+        throw std::runtime_error("Key '" + key + "' is not a number");
+      return static_cast<float>(lua_tonumber(L, -1));
+    } else if constexpr (std::is_same_v<T, double>) {
+      if (!lua_isnumber(L, -1))
+        throw std::runtime_error("Key '" + key + "' is not a number");
+      return static_cast<double>(lua_tonumber(L, -1));
+    } else if constexpr (std::is_same_v<T, bool>) {
+      if (!lua_isboolean(L, -1))
+        throw std::runtime_error("Key '" + key + "' is not a boolean");
+      return lua_toboolean(L, -1) != 0;
+    } else if constexpr (std::is_same_v<T, std::string>) {
+      if (!lua_isstring(L, -1))
+        throw std::runtime_error("Key '" + key + "' is not a string");
+      return std::string(lua_tostring(L, -1));
+    } else {
+      static_assert(!sizeof(T *), "Unsupported type for LuaConfig::get<T>()");
+    }
+  }
+};

nufi/parameters.h

@@ -1,60 +1,101 @@
 #ifndef PARAMETERS_H
 #define PARAMETERS_H
 
-#include <cmath>
 #include <cstddef>
-#include <cstdlib>
 #include <string>
 
+#include "lua_config.h"
+
 namespace Parameters {
-constexpr unsigned int DIMENSION = 1;
 
-constexpr double X_DOMAIN_LEFT = 0.0;
-constexpr double X_DOMAIN_RIGHT = 4 * M_PI;
-constexpr double LX = std::abs(X_DOMAIN_RIGHT - X_DOMAIN_LEFT);
-constexpr double LX_INV = 1 / LX;
+inline unsigned int DIMENSION;
 
-constexpr double V_DOMAIN_LEFT = -10.;
-constexpr double V_DOMAIN_RIGHT = 10.;
+inline double X_DOMAIN_LEFT;
+inline double X_DOMAIN_RIGHT;
+inline double LX;
+inline double LX_INV;
 
-constexpr unsigned int NV = 256;
-constexpr double DV = std::abs(V_DOMAIN_RIGHT - V_DOMAIN_LEFT) / NV;
+inline double V_DOMAIN_LEFT;
+inline double V_DOMAIN_RIGHT;
+
+inline unsigned int NV;
+inline double DV;
 
 // f0_TYPE:
 // 0 -> twos-stream
 // 1 -> landau-damping
 // 2 -> maxwellian
 // 3 -> bump-on-tail
-constexpr size_t f0_TYPE = 1;
+inline size_t f0_TYPE;
 
 // deal.ii options
-constexpr unsigned int GLOBAL_REFINEMENT = 8;
-constexpr unsigned int FE_DEGREE = 3;
-constexpr unsigned int CONVERGENCE_ITERATIONS = 10000;
-constexpr double CONVERGENCE_LIMIT = 1e-8;
+inline unsigned int GLOBAL_REFINEMENT;
+inline unsigned int FE_DEGREE;
+inline unsigned int CONVERGENCE_ITERATIONS;
+inline double CONVERGENCE_LIMIT;
 
 // Adaptive refinement options
-constexpr unsigned int REFINE_FREQUENCY = 50;
-constexpr double REFINEMENT_TOP_FRACTION = 0.8;
-constexpr double REFINEMENT_BOTTOM_FRACTION = 0.1;
+inline unsigned int REFINE_FREQUENCY;
+inline double REFINEMENT_TOP_FRACTION;
+inline double REFINEMENT_BOTTOM_FRACTION;
 
-// Gauge options
-constexpr double GAUGE_DOMAIN_LEFT = 3.2;
-constexpr double GAUGE_DOMAIN_RIGHT = 3.8;
-
-constexpr double EPS = 0.01;
-constexpr double WAVE_NR = 0.5;
-constexpr double F0_FACTOR = 0.39894228040143267793994; // 1/sqrt(2pi)
+inline double EPS;
+inline double WAVE_NR;
+inline double F0_FACTOR; // 1/sqrt(2pi)
 
 // NUFI options
-constexpr double DT = 1. / 10.;
-constexpr unsigned int TMAX = 100;
+inline double DT;
+inline unsigned int TMAX;
 
 // Plotting options
-constexpr int PLOT_FREQUENCY = 10;
-constexpr size_t PLOT_NX = 512;
-constexpr double PLOT_DX = LX / PLOT_NX;
-const std::string PLOT_DIR = "results/";
+inline int PLOT_FREQUENCY;
+inline size_t PLOT_NX;
+inline double PLOT_DX;
+inline std::string PLOT_DIR;
+
+inline void load_lua_config(const std::string &luaFilePath) {
+  LuaConfig config(luaFilePath, "parameters");
+
+  DIMENSION = static_cast<unsigned int>(config.get<int>("DIMENSION"));
+
+  X_DOMAIN_LEFT = config.get<double>("X_DOMAIN_LEFT");
+  X_DOMAIN_RIGHT = config.get<double>("X_DOMAIN_RIGHT");
+  LX = config.get<double>("LX");
+  LX_INV = config.get<double>("LX_INV");
+
+  V_DOMAIN_LEFT = config.get<double>("V_DOMAIN_LEFT");
+  V_DOMAIN_RIGHT = config.get<double>("V_DOMAIN_RIGHT");
+
+  NV = static_cast<unsigned int>(config.get<int>("NV"));
+  DV = config.get<double>("DV");
+
+  f0_TYPE = static_cast<size_t>(config.get<int>("f0_TYPE"));
+
+  GLOBAL_REFINEMENT =
+      static_cast<unsigned int>(config.get<int>("GLOBAL_REFINEMENT"));
+  FE_DEGREE = static_cast<unsigned int>(config.get<int>("FE_DEGREE"));
+  CONVERGENCE_ITERATIONS =
+      static_cast<unsigned int>(config.get<int>("CONVERGENCE_ITERATIONS"));
+  CONVERGENCE_LIMIT = config.get<double>("CONVERGENCE_LIMIT");
+
+  REFINE_FREQUENCY =
+      static_cast<unsigned int>(config.get<int>("REFINE_FREQUENCY"));
+  REFINEMENT_TOP_FRACTION = config.get<double>("REFINEMENT_TOP_FRACTION");
+  REFINEMENT_BOTTOM_FRACTION = config.get<double>("REFINEMENT_BOTTOM_FRACTION");
+
+  EPS = config.get<double>("EPS");
+  WAVE_NR = config.get<double>("WAVE_NR");
+  F0_FACTOR = config.get<double>("F0_FACTOR");
+
+  DT = config.get<double>("DT");
+  TMAX = static_cast<unsigned int>(config.get<int>("TMAX"));
+
+  PLOT_FREQUENCY = config.get<int>("PLOT_FREQUENCY");
+  PLOT_NX = static_cast<size_t>(config.get<int>("PLOT_NX"));
+  PLOT_DX = config.get<double>("PLOT_DX");
+  PLOT_DIR = config.get<std::string>("PLOT_DIR");
+}
+
 } // namespace Parameters
 
-#endif
+#endif // PARAMETERS_H

parameters.lua

@@ -0,0 +1,86 @@
+local DIMENSION = 1
+
+local X_DOMAIN_LEFT = 0.0
+local X_DOMAIN_RIGHT = 4 * math.pi
+
+local V_DOMAIN_LEFT = -10.0
+local V_DOMAIN_RIGHT = 10.0
+
+local NV = 256
+
+-- f0_TYPE:
+-- 0 -> twos-stream
+-- 1 -> landau-damping
+-- 2 -> maxwellian
+-- 3 -> bump-on-tail
+local f0_TYPE = 1
+
+
+-- deal.ii options
+local GLOBAL_REFINEMENT = 8
+local FE_DEGREE = 3
+local CONVERGENCE_ITERATIONS = 5000
+local CONVERGENCE_LIMIT = 1e-7
+
+
+-- Adaptive refinement options
+local REFINE_FREQUENCY = 50
+local REFINEMENT_TOP_FRACTION = .8
+local REFINEMENT_BOTTOM_FRACTION = .1
+
+local EPS = .01
+local WAVE_NR = .5
+local F0_FACTOR = 0.39894228040143267793994
+
+
+-- NUFI options
+local DT = 1. / 10.
+local TMAX = 100
+
+-- Plotting options
+local PLOT_FREQUENCY = 20
+
+local LX = math.abs(X_DOMAIN_RIGHT - X_DOMAIN_LEFT)
+local PLOT_NX = 512
+
+parameters = {
+  DIMENSION = DIMENSION,
+
+  X_DOMAIN_LEFT = X_DOMAIN_LEFT,
+  X_DOMAIN_RIGHT = X_DOMAIN_RIGHT,
+  LX = LX,
+  LX_INV = 1.0 / LX,
+
+  V_DOMAIN_LEFT = V_DOMAIN_LEFT,
+  V_DOMAIN_RIGHT = V_DOMAIN_RIGHT,
+
+  NV = NV,
+  DV = math.abs(V_DOMAIN_RIGHT - V_DOMAIN_LEFT) / NV,
+
+  f0_TYPE = f0_TYPE,
+
+  -- deal.ii options
+  GLOBAL_REFINEMENT = GLOBAL_REFINEMENT,
+  FE_DEGREE = FE_DEGREE,
+  CONVERGENCE_ITERATIONS = CONVERGENCE_ITERATIONS,
+  CONVERGENCE_LIMIT = CONVERGENCE_LIMIT,
+
+  -- Adaptive refinement options
+  REFINE_FREQUENCY = REFINE_FREQUENCY,
+  REFINEMENT_TOP_FRACTION = REFINEMENT_TOP_FRACTION,
+  REFINEMENT_BOTTOM_FRACTION = REFINEMENT_BOTTOM_FRACTION,
+
+  EPS = EPS,
+  WAVE_NR = WAVE_NR,
+  F0_FACTOR = F0_FACTOR, -- 1/sqrt(2pi)
+
+  -- NUFI options
+  DT = DT,
+  TMAX = TMAX,
+
+  -- Plotting options
+  PLOT_FREQUENCY = PLOT_FREQUENCY,
+  PLOT_NX = PLOT_NX,
+  PLOT_DX = LX / PLOT_NX,
+  PLOT_DIR = "results/",
+}

src/main.cc

@@ -1,6 +1,7 @@
 #include <filesystem>
 #include <iostream>
 #include <nufi/nufi_solver.h>
+#include <nufi/parameters.h>
 #include <nufi/poisson_problem.h>
 #include <nufi/save_results.h>
 #include <omp.h>
@@ -139,6 +140,9 @@ int main() {
   std::cout << "Threads: " << omp_get_max_threads() << "\n";
   try {
 
+    std::cout << "Loading parameters from lua config" << "\n";
+    Parameters::load_lua_config("parameters.lua");
+
     clear_results_directory("results");
     run<1>(); // 1 = space_dim