if not CONFIG_PATH then more env

src/stream.rs

@@ -4,6 +4,7 @@ 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>;
@@ -197,18 +198,17 @@ pub fn build_output_stream(cfg: &Stream) -> Box<dyn OutputStream> {
 }
 
 pub struct OutputStreamFormatted {
-   format: Box<dyn Fn(Vec<char>) -> Vec<char>>,
+   format: Option<String>,
    stream: Box<dyn OutputStream>,
 }
 
 pub fn build_formatted_output_stream(cfg: &Stream, stream: Box<dyn OutputStream>) -> Box<dyn OutputStream> {
    return Box::new(OutputStreamFormatted{
-      format: Box::new(|v: Vec<char>| reg.render("x", &json!()).unwrap()),
+      format: cfg.format.clone(),
       stream: stream,
    });
 }
 
-// TODO use https://crates.io/crates/handlebars instead
 impl OutputStream for OutputStreamFormatted {
    fn put(&mut self, v: Vec<char>) {
       match self.format.as_ref() {
@@ -218,6 +218,13 @@ impl OutputStream for OutputStreamFormatted {
    }
 }
 
+fn sprintf(x: &String, v: Vec<char>) -> Vec<char> {
+   let mut reg = Handlebars::new();
+   return reg.render_template(x, &json!({
+      "VALUE": v.iter().collect::<String>(),
+   })).unwrap().chars().collect();
+}
+
 pub fn _build_output_stream(cfg: &Stream) -> Box<dyn OutputStream> {
    if cfg.engine.name.as_str() == "stdout" {
       return Box::new(OutputStreamStdout{});
@@ -256,18 +263,16 @@ mod test_output {
       engine.put("teehee".to_string().chars().collect());
    }
 
-   /*
    #[test]
    fn test_output_stream_formatted() {
       assert_eq!(
          "hello world".to_string().chars().collect::<Vec<char>>(),
          sprintf(
-            &String::from("hello %s"),
+            &String::from("hello {{ VALUE }}"),
             String::from("world").chars().collect(),
          ),
       );
    }
-   */
 }
 
 pub struct OutputStreamUDP {