Add codegen for new rust yunq parser.

yunq/rust/src/main.rs

@@ -3,7 +3,7 @@ mod lexer;
 mod parser;
 
 use std::error::Error;
-use std::fs::read_to_string;
+use std::fs;
 
 use clap::Parser;
 
@@ -13,22 +13,24 @@ struct Args {
     // The .yunq file to parse
     #[arg(short, long)]
     input_path: String,
+
+    // The .rs file to generate
+    #[arg(short, long)]
+    output_path: String,
 }
 
 fn main() -> Result<(), Box<dyn Error>> {
     let args = Args::parse();
-    let input = read_to_string(args.input_path)?;
+    let input = fs::read_to_string(args.input_path)?;
     let tokens = lexer::lex_input(&input)?;
 
     let mut ast_parser = parser::Parser::new(&tokens);
     ast_parser.parse_ast()?;
     ast_parser.type_check()?;
 
-    for decl in ast_parser.ast() {
-        println!("{:?}", decl);
-    }
+    let code = codegen::generate_code(ast_parser.ast());
 
-    println!("{}", codegen::generate_code(ast_parser.ast())?);
+    fs::write(args.output_path, code)?;
 
     Ok(())
 }