diff --git a/src/stream.rs b/src/stream.rs
index 9533eea..3c4cf32 100644
--- a/src/stream.rs
+++ b/src/stream.rs
@@ -4,7 +4,6 @@ use hidapi::HidApi;
 use rusb::UsbContext;
 use gilrs::{Gilrs, Button, Event};
 use serde_json::json;
-use handlebars::Handlebars;
 
 pub trait InputStream {
    fn get(&mut self) -> Vec<char>;
@@ -197,34 +196,23 @@ pub fn build_output_stream(cfg: &Stream) -> Box<dyn OutputStream> {
    return build_formatted_output_stream(cfg, _build_output_stream(cfg))
 }
 
-pub struct OutputStreamFormatted<'a> {
-   format: Option<Box<&'a dyn Fn(Vec<char>) -> Vec<char>>>,
+pub struct OutputStreamFormatted {
+   format: Box<dyn Fn(Vec<char>) -> Vec<char>>,
    stream: Box<dyn OutputStream>,
 }
 
 pub fn build_formatted_output_stream(cfg: &Stream, stream: Box<dyn OutputStream>) -> Box<dyn OutputStream> {
    return Box::new(OutputStreamFormatted{
-      format: match cfg.format.clone() {
-         Some(x) => {
-            let x = x.clone();
-            Some(Box::new(
-               &|v: Vec<char>| {
-                  let mut reg = Handlebars::new();
-                  reg.register_template_string("x", x.clone());
-                  reg.render("x", &json!({"x": v})).unwrap().chars().collect()
-               },
-            ))
-         },
-         None => None,
-      },
+      format: Box::new(|v: Vec<char>| reg.render("x", &json!()).unwrap()),
       stream: stream,
    });
 }
 
-impl<'a> OutputStream for OutputStreamFormatted<'a> {
+// TODO use https://crates.io/crates/handlebars instead
+impl OutputStream for OutputStreamFormatted {
    fn put(&mut self, v: Vec<char>) {
       match self.format.as_ref() {
-         Some(x) => self.stream.put(x(v)),
+         Some(x) => self.stream.put(sprintf(x, v)),
          None => self.stream.put(v),
       };
    }