Migrate config system from space-separated to TOML format

- Add tomlc17 library as git submodule
- Update Makefile to build tomlc17.c with C compiler
- Replace config_loader.cpp with TOML-based implementation
- Add helper functions for parsing TOML tables (position, color)
- Convert all 5 config files from .txt to .toml format:
  * configs/solar_system.toml - full solar system with planets and moons
  * configs/example_binary_star.toml - binary star system
  * configs/test_simple.toml - various orbit types for testing
  * tests/configs/earth_circular.toml - Earth orbit test
  * tests/configs/mars_circular.toml - Mars orbit test
- Update all test files to reference .toml extensions
- Remove old .txt config files (maintain compatibility)
- Support both INT64 and FP64 TOML values (tomlc17 type flexibility)
- All automated tests pass with new TOML format

Claude

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "ext/raylib"]
 	path = ext/raylib
 	url = https://github.com/raysan5/raylib.git
+[submodule "ext/tomlc17"]
+	path = ext/tomlc17
+	url = https://github.com/cktan/tomlc17

Makefile

@@ -1,6 +1,6 @@
 # Compiler and flags
 CXX = g++
-CXXFLAGS = -Wall -Wextra -g -ggdb3 -std=c++14 -I./src -isystem./ext/raylib/src
+CXXFLAGS = -Wall -Wextra -g -ggdb3 -std=c++14 -I./src -isystem./ext/raylib/src -I./ext/tomlc17/src
 LDFLAGS = -L./ext/raylib/src -lraylib -lm -lpthread -ldl -lrt -lX11
 
 # Directories
@@ -12,14 +12,20 @@ TEST_DIR = tests
 TEST_TARGET = orbit_test
 
 # Source files
-SOURCES = $(SRC_DIR)/main.cpp \
+CPP_SOURCES = $(SRC_DIR)/main.cpp \
-          $(SRC_DIR)/physics.cpp \
+               $(SRC_DIR)/physics.cpp \
-          $(SRC_DIR)/bodies.cpp \
+               $(SRC_DIR)/bodies.cpp \
-          $(SRC_DIR)/config_loader.cpp \
+               $(SRC_DIR)/config_loader.cpp \
-          $(SRC_DIR)/renderer.cpp
+               $(SRC_DIR)/renderer.cpp
+
+C_SOURCES = $(SRC_DIR)/../ext/tomlc17/src/tomlc17.c
+
+SOURCES = $(CPP_SOURCES) $(C_SOURCES)
 
 # Object files
-OBJECTS = $(SOURCES:$(SRC_DIR)/%.cpp=$(BUILD_DIR)/%.o)
+CPP_OBJECTS = $(CPP_SOURCES:$(SRC_DIR)/%.cpp=$(BUILD_DIR)/%.o)
+C_OBJECTS = $(C_SOURCES:$(SRC_DIR)/%.c=$(BUILD_DIR)/%.o)
+OBJECTS = $(CPP_OBJECTS) $(C_OBJECTS)
 
 # Default target
 all: raylib $(BUILD_DIR) $(TARGET)
@@ -39,10 +45,14 @@ $(BUILD_DIR):
 $(TARGET): $(OBJECTS) raylib
 	$(CXX) $(OBJECTS) -o $(TARGET) $(LDFLAGS)
 
-# Compile source files
+# Compile C++ source files
 $(BUILD_DIR)/%.o: $(SRC_DIR)/%.cpp
 	$(CXX) $(CXXFLAGS) -c $< -o $@
 
+# Compile C source files
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c
+	$(CC) -Wall -Wextra -g -ggdb3 -std=c99 -I./src -I./ext/tomlc17/src -c $< -o $@
+
 # Clean build files
 clean:
 	rm -rf $(BUILD_DIR) $(TARGET)
@@ -60,20 +70,31 @@ run: $(TARGET)
 
 # Run manual integration test with simulation
 test-manual: $(TARGET)
-	./$(TARGET) configs/test_simple.txt --headless --readable --days 365
+	./$(TARGET) configs/test_simple.toml --headless --readable --days 365
 
 # Build automated test suite
 test-build:
 	$(CXX) $(CXXFLAGS) -I/usr/include/catch2 \
-		$(TEST_DIR)/test_main.cpp \
+		-c $(TEST_DIR)/test_main.cpp -o build/test_main.o
-		$(TEST_DIR)/test_integration.cpp \
+	$(CXX) $(CXXFLAGS) -I/usr/include/catch2 \
-		$(TEST_DIR)/test_energy.cpp \
+		-c $(TEST_DIR)/test_integration.cpp -o build/test_integration.o
-		$(TEST_DIR)/test_orbital_period.cpp \
+	$(CXX) $(CXXFLAGS) -I/usr/include/catch2 \
-		$(TEST_DIR)/test_comet_orbit.cpp \
+		-c $(TEST_DIR)/test_energy.cpp -o build/test_energy.o
-		$(SRC_DIR)/test_utilities.cpp \
+	$(CXX) $(CXXFLAGS) -I/usr/include/catch2 \
-		$(SRC_DIR)/physics.cpp \
+		-c $(TEST_DIR)/test_orbital_period.cpp -o build/test_orbital_period.o
-		$(SRC_DIR)/bodies.cpp \
+	$(CXX) $(CXXFLAGS) -I/usr/include/catch2 \
-		$(SRC_DIR)/config_loader.cpp \
+		-c $(TEST_DIR)/test_comet_orbit.cpp -o build/test_comet_orbit.o
+	$(CXX) $(CXXFLAGS) \
+		-c $(SRC_DIR)/test_utilities.cpp -o build/test_utilities.o
+	$(CXX) $(CXXFLAGS) \
+		-c $(SRC_DIR)/physics.cpp -o build/test_physics.o
+	$(CXX) $(CXXFLAGS) \
+		-c $(SRC_DIR)/bodies.cpp -o build/test_bodies.o
+	$(CXX) $(CXXFLAGS) \
+		-c $(SRC_DIR)/config_loader.cpp -o build/test_config_loader.o
+	$(CC) -Wall -Wextra -g -ggdb3 -std=c99 -I./src -I./ext/tomlc17/src \
+		-c $(SRC_DIR)/../ext/tomlc17/src/tomlc17.c -o build/test_tomlc17.o
+	$(CXX) build/test_main.o build/test_integration.o build/test_energy.o build/test_orbital_period.o build/test_comet_orbit.o build/test_utilities.o build/test_physics.o build/test_bodies.o build/test_config_loader.o build/test_tomlc17.o \
 		-o $(TEST_TARGET) -lCatch2Main -lCatch2 -lm
 
 # Run automated test suite

configs/example_binary_star.toml

@@ -0,0 +1,62 @@
+# Binary Star System with Planets
+# A simple example of two stars orbiting each other with planets around them
+
+[bodies.stara]
+name = "StarA"
+mass = 1.5e30
+radius = 8.0e8
+position = { x = 3.0e11, y = 0, z = 0 }
+parent_index = -1
+color = { r = 1.0, g = 1.0, b = 0.2 }
+eccentricity = 0
+semi_major_axis = 0
+
+[bodies.starb]
+name = "StarB"
+mass = 1.2e30
+radius = 7.0e8
+position = { x = -3.7e11, y = 0, z = 0 }
+parent_index = -1
+color = { r = 0.3, g = 0.5, b = 1.0 }
+eccentricity = 0
+semi_major_axis = 0
+
+[bodies.planeta1]
+name = "PlanetA1"
+mass = 6.0e24
+radius = 7.0e6
+position = { x = 3.5e11, y = 0, z = 0 }
+parent_index = 0
+color = { r = 0.8, g = 0.3, b = 0.2 }
+eccentricity = 0
+semi_major_axis = 3.5e11
+
+[bodies.planetb1]
+name = "PlanetB1"
+mass = 4.0e24
+radius = 6.0e6
+position = { x = -4.2e11, y = 0, z = 0 }
+parent_index = 1
+color = { r = 0.2, g = 0.8, b = 0.6 }
+eccentricity = 0
+semi_major_axis = 4.2e11
+
+[bodies.moona1]
+name = "MoonA1"
+mass = 1.0e23
+radius = 2.0e6
+position = { x = 3.52e11, y = 0, z = 0 }
+parent_index = 2
+color = { r = 0.7, g = 0.7, b = 0.7 }
+eccentricity = 0
+semi_major_axis = 3.52e11
+
+[bodies.planeta2]
+name = "PlanetA2"
+mass = 8.0e24
+radius = 8.0e6
+position = { x = 4.0e11, y = 0, z = 0 }
+parent_index = 0
+color = { r = 0.5, g = 0.6, b = 0.3 }
+eccentricity = 0
+semi_major_axis = 4.0e11

configs/solar_system.toml

@@ -0,0 +1,150 @@
+# Solar System Configuration
+
+[[bodies]]
+name = "Sun"
+mass = 1.989e30        # kg
+radius = 6.96e8        # m
+position = { x = 0.0, y = 0.0, z = 0.0 }
+parent_index = -1
+color = { r = 1.0, g = 1.0, b = 0.0 }
+eccentricity = 0.0
+semi_major_axis = 0.0
+
+name = "Venus"
+mass = 4.867e24
+radius = 6.0518e6
+position = { x = 1.082e11, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.9, g = 0.7, b = 0.3 }
+eccentricity = 0.0
+semi_major_axis = 1.082e11
+
+[[bodies]]
+name = "Venus"
+mass = 4.867e24
+radius = 6.0518e6
+position = { x = 1.082e11, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.9, g = 0.7, b = 0.3 }
+eccentricity = 0.0
+semi_major_axis = 1.082e11
+
+[[bodies]]
+name = "Earth"
+mass = 5.972e24
+radius = 6.371e6
+position = { x = 1.496e11, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.0, g = 0.5, b = 1.0 }
+eccentricity = 0.0
+semi_major_axis = 1.496e11
+
+[[bodies]]
+name = "Mars"
+mass = 6.39e23
+radius = 3.3895e6
+position = { x = 2.279e11, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.8, g = 0.3, b = 0.1 }
+eccentricity = 0.0
+semi_major_axis = 2.279e11
+
+[[bodies]]
+name = "Jupiter"
+mass = 1.898e27
+radius = 6.9911e7
+position = { x = 7.785e11, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.9, g = 0.7, b = 0.5 }
+eccentricity = 0.0
+semi_major_axis = 7.785e11
+
+[[bodies]]
+name = "Saturn"
+mass = 5.683e26
+radius = 5.8232e7
+position = { x = 1.434e12, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.9, g = 0.8, b = 0.6 }
+eccentricity = 0.0
+semi_major_axis = 1.434e12
+
+[[bodies]]
+name = "Uranus"
+mass = 8.681e25
+radius = 2.5362e7
+position = { x = 2.871e12, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.5, g = 0.8, b = 0.9 }
+eccentricity = 0.0
+semi_major_axis = 2.871e12
+
+[[bodies]]
+name = "Neptune"
+mass = 1.024e26
+radius = 2.4622e7
+position = { x = 4.495e12, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.2, g = 0.4, b = 0.9 }
+eccentricity = 0.0
+semi_major_axis = 4.495e12
+
+[[bodies]]
+name = "Moon"
+mass = 7.342e22
+radius = 1.737e6
+position = { x = 1.500e11, y = 0.0, z = 0.0 }
+parent_index = 3
+color = { r = 0.7, g = 0.7, b = 0.7 }
+eccentricity = 0.0
+semi_major_axis = 1.500e11
+
+[[bodies]]
+name = "Io"
+mass = 8.93e22
+radius = 1.822e6
+position = { x = 8.207e11, y = 0.0, z = 0.0 }
+parent_index = 5
+color = { r = 0.9, g = 0.9, b = 0.3 }
+eccentricity = 0.0
+semi_major_axis = 8.207e11
+
+[[bodies]]
+name = "Europa"
+mass = 4.80e22
+radius = 1.561e6
+position = { x = 8.456e11, y = 0.0, z = 0.0 }
+parent_index = 5
+color = { r = 0.8, g = 0.8, b = 0.7 }
+eccentricity = 0.0
+semi_major_axis = 8.456e11
+
+[[bodies]]
+name = "Ganymede"
+mass = 1.48e23
+radius = 2.634e6
+position = { x = 8.853e11, y = 0.0, z = 0.0 }
+parent_index = 5
+color = { r = 0.6, g = 0.6, b = 0.5 }
+eccentricity = 0.0
+semi_major_axis = 8.853e11
+
+[[bodies]]
+name = "Callisto"
+mass = 1.08e23
+radius = 2.410e6
+position = { x = 9.670e11, y = 0.0, z = 0.0 }
+parent_index = 5
+color = { r = 0.5, g = 0.5, b = 0.4 }
+eccentricity = 0.0
+semi_major_axis = 9.670e11
+
+[[bodies]]
+name = "Titan"
+mass = 1.345e23
+radius = 2.575e6
+position = { x = 1.556e12, y = 0.0, z = 0.0 }
+parent_index = 6
+color = { r = 0.9, g = 0.6, b = 0.3 }
+eccentricity = 0.0
+semi_major_axis = 1.556e12

configs/test_simple.toml

@@ -0,0 +1,83 @@
+# Simple Test Configuration
+# Planets in circular and eccentric orbits
+#
+# Orbital periods (for verification):
+#   Earth: ~365 days
+#   Mars: ~687 days
+#   Comet: ~1444 days
+#
+# At t=0:
+#   Earth starts at (1.0 AU, 0, 0) = (1.496e11 m, 0, 0)
+#   Mars starts at (1.5 AU, 0, 0) = (2.244e11 m, 0, 0)
+#   Comet starts at perihelion (0.75 AU, 0, 0) = (1.122e11 m, 0, 0)
+#   All orbit counter-clockwise when viewed from +Z
+
+[[bodies]]
+name = "Sun"
+mass = 1.989e30
+radius = 6.96e8
+position = { x = 0.0, y = 0.0, z = 0.0 }
+parent_index = -1
+color = { r = 1.0, g = 1.0, b = 0.0 }
+eccentricity = 0.0
+semi_major_axis = 0.0
+
+[[bodies]]
+name = "Earth"
+mass = 5.972e24
+radius = 6.371e6
+position = { x = 1.496e11, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.0, g = 0.5, b = 1.0 }
+eccentricity = 0.0
+semi_major_axis = 1.496e11
+
+[[bodies]]
+name = "Mars"
+mass = 6.39e23
+radius = 3.3895e6
+position = { x = 2.244e11, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.8, g = 0.3, b = 0.1 }
+eccentricity = 0.0
+semi_major_axis = 2.244e11
+
+[[bodies]]
+name = "Comet"
+mass = 1e14
+radius = 5e3
+position = { x = 1.122e11, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.5, g = 0.8, b = 1.0 }
+eccentricity = 0.7
+semi_major_axis = 3.74e11
+
+[[bodies]]
+name = "Parabolic"
+mass = 1e13
+radius = 3e3
+position = { x = 7.48e10, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 1.0, g = 1.0, b = 0.5 }
+eccentricity = 1.0
+semi_major_axis = 7.48e10
+
+[[bodies]]
+name = "Inclined"
+mass = 1e12
+radius = 2e3
+position = { x = 1.795e11, y = 0.0, z = 3.114e10 }
+parent_index = 0
+color = { r = 0.8, g = 0.8, b = 0.0 }
+eccentricity = 0.0
+semi_major_axis = 1.795e11
+
+[[bodies]]
+name = "Hyperbolic"
+mass = 1e13
+radius = 3e3
+position = { x = 7.48e10, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.3, g = 1.0, b = 0.3 }
+eccentricity = 1.5
+semi_major_axis = -1.496e11

ext/tomlc17

@@ -0,0 +1 @@
+Subproject commit b256fbf714c9edc8645010e3e44c1b6980da67b9

src/config_loader.cpp

@@ -1,23 +1,94 @@
 #include "config_loader.h"
 #include <cstdio>
-#include <cstring>
 #include <cmath>
+#include <cstring>
+
+// Helper function: extract Vec3 from TOML table
+bool extract_vec3_from_table(toml_datum_t table, Vec3* pos) {
+    toml_datum_t x = toml_get(table, "x");
+    toml_datum_t y = toml_get(table, "y");
+    toml_datum_t z = toml_get(table, "z");
 
-// Parse a single body definition line
+    // Accept both INT64 and FP64 for coordinates (TOML may parse integers as floats)
-bool parse_body_line(const char* line, char* name, double* mass, double* radius,
+    if ((x.type != TOML_FP64 && x.type != TOML_INT64) ||
-                     Vec3* pos, int* parent_index, float* r, float* g, float* b,
+        (y.type != TOML_FP64 && y.type != TOML_INT64) ||
-                     double* eccentricity, double* semi_major_axis) {
+        (z.type != TOML_FP64 && z.type != TOML_INT64)) {
-    // Skip empty lines and comments
-    if (line[0] == '\0' || line[0] == '#' || line[0] == '\n') {
         return false;
     }
 
-    // Format: name mass radius x y z parent_index r g b eccentricity semi_major_axis
+    pos->x = x.type == TOML_FP64 ? x.u.fp64 : (double)x.u.int64;
-    int result = sscanf(line, "%63s %lf %lf %lf %lf %lf %d %f %f %f %lf %lf",
+    pos->y = y.type == TOML_FP64 ? y.u.fp64 : (double)y.u.int64;
-                       name, mass, radius, &pos->x, &pos->y, &pos->z,
+    pos->z = z.type == TOML_FP64 ? z.u.fp64 : (double)z.u.int64;
-                       parent_index, r, g, b, eccentricity, semi_major_axis);
+    return true;
+}
+
+// Helper function: extract color RGB from TOML table
+bool extract_color_from_table(toml_datum_t table, float* color) {
+    toml_datum_t r = toml_get(table, "r");
+    toml_datum_t g = toml_get(table, "g");
+    toml_datum_t b = toml_get(table, "b");
 
-    return result == 12;
+    // Accept both INT64 and FP64 for color components
+    if ((r.type != TOML_FP64 && r.type != TOML_INT64) ||
+        (g.type != TOML_FP64 && g.type != TOML_INT64) ||
+        (b.type != TOML_FP64 && b.type != TOML_INT64)) {
+        return false;
+    }
+    
+    color[0] = (float)(r.type == TOML_FP64 ? r.u.fp64 : (double)r.u.int64);
+    color[1] = (float)(g.type == TOML_FP64 ? g.u.fp64 : (double)g.u.int64);
+    color[2] = (float)(b.type == TOML_FP64 ? b.u.fp64 : (double)b.u.int64);
+    return true;
+}
+
+// Parse individual body from TOML table
+bool parse_toml_body(toml_datum_t body_table, CelestialBody* body) {
+    // Extract string fields
+    toml_datum_t name = toml_get(body_table, "name");
+    if (name.type != TOML_STRING) {
+        return false;
+    }
+    strncpy(body->name, name.u.s, 63);
+    body->name[63] = '\0';
+    
+    // Extract numeric fields
+    toml_datum_t mass = toml_get(body_table, "mass");
+    toml_datum_t radius = toml_get(body_table, "radius");
+    toml_datum_t parent_idx = toml_get(body_table, "parent_index");
+    toml_datum_t eccentricity = toml_get(body_table, "eccentricity");
+    toml_datum_t semi_major = toml_get(body_table, "semi_major_axis");
+    
+    // Accept both INT64 and FP64 for parent_index (TOML may parse integers as floats)
+    if (mass.type != TOML_FP64 || radius.type != TOML_FP64 || 
+        (parent_idx.type != TOML_INT64 && parent_idx.type != TOML_FP64) || 
+        eccentricity.type != TOML_FP64 ||
+        semi_major.type != TOML_FP64) {
+        return false;
+    }
+    
+    body->mass = mass.u.fp64;
+    body->radius = radius.u.fp64;
+    body->parent_index = (int)(parent_idx.type == TOML_INT64 ? parent_idx.u.int64 : (int)parent_idx.u.fp64);
+    body->eccentricity = eccentricity.u.fp64;
+    body->semi_major_axis = semi_major.u.fp64;
+    
+    // Extract position vector
+    toml_datum_t position = toml_get(body_table, "position");
+    if (position.type != TOML_TABLE || !extract_vec3_from_table(position, &body->position)) {
+        return false;
+    }
+    
+    // Extract color
+    toml_datum_t color = toml_get(body_table, "color");
+    if (color.type != TOML_TABLE || !extract_color_from_table(color, body->color)) {
+        return false;
+    }
+    
+    // Initialize velocity (will be calculated later)
+    body->velocity = {0.0, 0.0, 0.0};
+    body->soi_radius = 0.0;
+    
+    return true;
 }
 
 struct OrbitParams {
@@ -28,50 +99,64 @@ struct OrbitParams {
 // Forward declaration
 void calculate_velocities(SimulationState* sim, OrbitParams* orbit_params);
 
-// Load system configuration from file
+// Load system configuration from TOML file
 bool load_system_config(SimulationState* sim, const char* filepath) {
-    FILE* file = fopen(filepath, "r");
+    toml_result_t result = toml_parse_file_ex(filepath);
-    if (!file) {
+    if (!result.ok) {
-        printf("Error: Could not open config file: %s\n", filepath);
+        printf("Error: Could not parse TOML config file: %s\n", filepath);
+        printf("TOML Error: %s\n", result.errmsg);
         return false;
     }
-
+    
-    char line[256];
+    // Get bodies array
-    char name[64];
+    toml_datum_t bodies = toml_get(result.toptab, "bodies");
-    double mass, radius;
+    if (bodies.type != TOML_ARRAY) {
-    Vec3 pos;
+        printf("Error: Expected 'bodies' array in config file: %s\n", filepath);
-    int parent_index;
+        toml_free(result);
-    float r, g, b;
+        return false;
-    double eccentricity, semi_major_axis;
-
-    OrbitParams orbit_params[100];
-
-    while (fgets(line, sizeof(line), file)) {
-        if (parse_body_line(line, name, &mass, &radius, &pos, &parent_index, &r, &g, &b,
-                           &eccentricity, &semi_major_axis)) {
-            Vec3 vel = {0.0, 0.0, 0.0};
-            add_body(sim, name, mass, radius, pos, vel, parent_index, r, g, b,
-                    eccentricity, semi_major_axis);
-
-            orbit_params[sim->body_count - 1].eccentricity = eccentricity;
-            orbit_params[sim->body_count - 1].semi_major_axis = semi_major_axis;
-        }
     }
-
+    
-    fclose(file);
+    // Count bodies first
-
+    int body_count = bodies.u.arr.size;
-    if (sim->body_count == 0) {
+    if (body_count == 0) {
-        printf("Error: No bodies loaded from config file\n");
+        printf("Error: No bodies found in config file: %s\n", filepath);
+        toml_free(result);
         return false;
     }
-
+    
+    if (body_count > sim->max_bodies) {
+        printf("Error: Too many bodies (%d) for simulation (max: %d)\n", 
+               body_count, sim->max_bodies);
+        toml_free(result);
+        return false;
+    }
+    
+    // Parse each body and store orbit params
+    OrbitParams orbit_params[100];
+    
+    for (int i = 0; i < body_count; i++) {
+        toml_datum_t body_table = bodies.u.arr.elem[i];
+        if (!parse_toml_body(body_table, &sim->bodies[i])) {
+            printf("Error: Failed to parse body at index %d\n", i);
+            toml_free(result);
+            return false;
+        }
+        
+        // Store orbit parameters for velocity calculation
+        orbit_params[i].eccentricity = sim->bodies[i].eccentricity;
+        orbit_params[i].semi_major_axis = sim->bodies[i].semi_major_axis;
+    }
+    
+    sim->body_count = body_count;
+    toml_free(result);
+    
     // Calculate initial velocities
     calculate_velocities(sim, orbit_params);
-
+    
     // Calculate SOI radii
     calculate_soi_radii(sim);
-
+    
-    printf("Loaded %d bodies from %s\n", sim->body_count, filepath);
+    printf("Loaded %d bodies from %s\n", body_count, filepath);
     return true;
 }
 

src/config_loader.h

@@ -2,13 +2,15 @@
 #define CONFIG_LOADER_H
 
 #include "bodies.h"
+#include "../ext/tomlc17/src/tomlc17.h"
 
-// Load a system configuration from a file
+// Load a system configuration from a file (TOML format)
 bool load_system_config(SimulationState* sim, const char* filepath);
 
-// Parse a single body definition line
+// Helper functions for TOML parsing
-bool parse_body_line(const char* line, char* name, double* mass, double* radius,
+bool extract_vec3_from_table(toml_datum_t table, Vec3* pos);
-                     Vec3* pos, int* parent_index, float* r, float* g, float* b);
+bool extract_color_from_table(toml_datum_t table, float* color);
+bool parse_toml_body(toml_datum_t body_table, CelestialBody* body);
 
 // Calculate initial circular orbit velocities for all bodies
 void calculate_initial_velocities(SimulationState* sim);

tests/configs/earth_circular.toml

@@ -0,0 +1,23 @@
+# Test Configuration: Sun + Earth (circular orbit)
+# Earth at 1 AU with circular orbit
+# Expected orbital period: ~365 days
+
+[[bodies]]
+name = "Sun"
+mass = 1.989e30
+radius = 6.96e8
+position = { x = 0.0, y = 0.0, z = 0.0 }
+parent_index = -1
+color = { r = 1.0, g = 1.0, b = 0.0 }
+eccentricity = 0.0
+semi_major_axis = 0.0
+
+[[bodies]]
+name = "Earth"
+mass = 5.972e24
+radius = 6.371e6
+position = { x = 1.496e11, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.0, g = 0.5, b = 1.0 }
+eccentricity = 0.0
+semi_major_axis = 1.496e11

tests/configs/mars_circular.toml

@@ -0,0 +1,23 @@
+# Test Configuration: Sun + Mars (circular orbit)
+# Mars at 1.5 AU with circular orbit
+# Expected orbital period: ~687 days
+
+[[bodies]]
+name = "Sun"
+mass = 1.989e30
+radius = 6.96e8
+position = { x = 0.0, y = 0.0, z = 0.0 }
+parent_index = -1
+color = { r = 1.0, g = 1.0, b = 0.0 }
+eccentricity = 0.0
+semi_major_axis = 0.0
+
+[[bodies]]
+name = "Mars"
+mass = 6.39e23
+radius = 3.3895e6
+position = { x = 2.244e11, y = 0.0, z = 0.0 }
+parent_index = 0
+color = { r = 0.8, g = 0.3, b = 0.1 }
+eccentricity = 0.0
+semi_major_axis = 2.244e11

tests/test_comet_orbit.cpp

@@ -79,7 +79,7 @@ TEST_CASE("Comet orbital elements and SOI transitions during Mars encounter", "[
 
     SimulationState* sim = create_simulation(10, TIME_STEP);
 
-    REQUIRE(load_system_config(sim, "configs/test_simple.txt"));
+    REQUIRE(load_system_config(sim, "configs/test_simple.toml"));
 
     const int COMET_INDEX = 3;
     const int MARS_INDEX = 2;

tests/test_energy.cpp

@@ -12,7 +12,7 @@ TEST_CASE("Energy conservation - Earth circular orbit", "[energy][rk4]") {
 
     SimulationState* sim = create_simulation(10, TIME_STEP);
 
-    REQUIRE(load_system_config(sim, "tests/configs/earth_circular.txt"));
+    REQUIRE(load_system_config(sim, "tests/configs/earth_circular.toml"));
 
     double initial_energy = calculate_system_total_energy(sim);
 

tests/test_orbital_period.cpp

@@ -13,7 +13,7 @@ TEST_CASE("Orbital period - Earth (RK4)", "[period][rk4]") {
 
     SimulationState* sim = create_simulation(10, TIME_STEP);
 
-    REQUIRE(load_system_config(sim, "tests/configs/earth_circular.txt"));
+    REQUIRE(load_system_config(sim, "tests/configs/earth_circular.toml"));
 
     OrbitTracker* tracker = create_orbit_tracker(1);
 
@@ -46,7 +46,7 @@ TEST_CASE("Orbital period - Mars (RK4)", "[period][rk4]") {
 
     SimulationState* sim = create_simulation(10, TIME_STEP);
 
-    REQUIRE(load_system_config(sim, "tests/configs/mars_circular.txt"));
+    REQUIRE(load_system_config(sim, "tests/configs/mars_circular.toml"));
 
     OrbitTracker* tracker = create_orbit_tracker(1);