diff --git a/src/main.rs b/src/main.rs
index 64236d5..cfc8c41 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,8 @@
-use std::{collections::HashMap, fs};
+use std::fs::DirBuilder;
+use std::io::Write;
+use std::{collections::HashMap, fs, io::BufWriter};
 
-use anyhow::Result;
+use anyhow::{anyhow, Context, Result};
 use endcap_sl_software_ri_generator::{generator::CodeGen, types};
 use itertools::Itertools;
 
@@ -25,10 +27,30 @@ fn main() -> Result<()> {
     println!("===========================================");
 
     let files = register_map.generate_register_interface(None, None, HashMap::new())?;
-    println!("{:#?}", files);
+    // println!("{:#?}", files);
     for filepath in files.keys().sorted() {
         println!("{}", filepath.display());
     }
+    if !std::fs::read_dir("register_interface")
+        .context("register_interface not found")?
+        .collect_vec()
+        .is_empty()
+    {
+        return Err(anyhow!("dir out is not empty"));
+    };
+    for (file, code) in files {
+        DirBuilder::new()
+            .recursive(true)
+            .create(file.parent().context("no parent")?)?;
+        let file = fs::OpenOptions::new()
+            .create(true)
+            .truncate(true)
+            .write(true)
+            .open(file)
+            .context("opening file")?;
+        let mut writer = BufWriter::new(file);
+        write!(writer, "{}", code)?;
+    }
 
     Ok(())
 }