more efforts to automate rhai bindings

rhai_autobind_macros/examples/rhai_autobind_example/main.rs

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+use rhai::{Engine, EvalAltResult};
+use rhai_autobind_macros::rhai_autobind;
+use serde::{Deserialize, Serialize};
+use std::path::Path;
+
+// Define a simple Calculator struct with the rhai_autobind attribute
+#[derive(Debug, Clone, Serialize, Deserialize, rhai::CustomType)]
+#[rhai_autobind]
+pub struct Calculator {
+    pub value: f64,
+}
+
+impl Calculator {
+    // Constructor
+    pub fn new() -> Self {
+        Calculator { value: 0.0 }
+    }
+    
+    // Add method
+    pub fn add(&mut self, x: f64) -> f64 {
+        self.value += x;
+        self.value
+    }
+    
+    // Subtract method
+    pub fn subtract(&mut self, x: f64) -> f64 {
+        self.value -= x;
+        self.value
+    }
+    
+    // Multiply method
+    pub fn multiply(&mut self, x: f64) -> f64 {
+        self.value *= x;
+        self.value
+    }
+    
+    // Divide method
+    pub fn divide(&mut self, x: f64) -> f64 {
+        if x == 0.0 {
+            println!("Error: Division by zero!");
+            return self.value;
+        }
+        self.value /= x;
+        self.value
+    }
+    
+    // Clear method
+    pub fn clear(&mut self) -> f64 {
+        self.value = 0.0;
+        self.value
+    }
+    
+    // Get value method
+    pub fn get_value(&self) -> f64 {
+        self.value
+    }
+}
+
+fn main() -> Result<(), Box<EvalAltResult>> {
+    println!("Rhai Calculator Example");
+    println!("======================");
+    
+    // Create a new Rhai engine
+    let mut engine = Engine::new();
+    
+    // Register the Calculator type with the engine using the generated function
+    Calculator::register_rhai_bindings_for_calculator(&mut engine);
+    
+    // Register print function for output
+    engine.register_fn("println", |s: &str| println!("{}", s));
+
+    // Create a calculator instance to demonstrate it works
+    let calc = Calculator::new();
+    println!("Initial value: {}", calc.value);
+    
+    // Load and run the Rhai script
+    let script_path = Path::new(env!("CARGO_MANIFEST_DIR"))
+        .join("examples")
+        .join("rhai_autobind_example")
+        .join("calculator.rhai");
+
+    println!("Loading Rhai script from: {}", script_path.display());
+
+    match engine.eval_file::<()>(script_path) {
+        Ok(_) => println!("Script executed successfully"),
+        Err(e) => eprintln!("Error executing script: {}\nAt: {:?}", e, e.position()),
+    }
+
+    Ok(())
+}