Feature gate local echo.

Cargo.toml

@@ -11,5 +11,10 @@ readme = "README.md"
 [dependencies]
 
 
+[features]
+default = ["echo"]
+echo = []
+
+
 [dev-dependencies]
 pancurses = "0.16"

README.md

@@ -171,6 +171,10 @@ It contains multiple paragraphs and should be preceeded by the parameter list.
 
 * None
 
+### v0.3.3
+
+* Add the possibility to disable local echo (via echo feature, enabled by default)
+
 ### v0.3.2
 
 * Shortened help output.

src/lib.rs

@@ -276,12 +276,21 @@ where
     /// Add a byte to the menu runner's buffer. If this byte is a
     /// carriage-return, the buffer is scanned and the appropriate action
     /// performed.
+    /// By default, an echo feature is enabled to display commands on the terminal.
     pub fn input_byte(&mut self, input: u8) {
         // Strip carriage returns
         if input == 0x0A {
             return;
         }
         let outcome = if input == 0x0D {
+            #[cfg(not(feature = "echo"))]
+            {
+                // Echo the command
+                write!(self.context, "\r").unwrap();
+                if let Ok(s) = core::str::from_utf8(&self.buffer[0..self.used]) {
+                    write!(self.context, "{}", s).unwrap();
+                }
+            }
             // Handle the command
             self.process_command();
             Outcome::CommandProcessed
@@ -296,19 +305,22 @@ where
             self.buffer[self.used] = input;
             self.used += 1;
 
-            // We have to do this song and dance because `self.prompt()` needs
-            // a mutable reference to self, and we can't have that while
-            // holding a reference to the buffer at the same time.
-            // This line grabs the buffer, checks it's OK, then releases it again
-            let valid = core::str::from_utf8(&self.buffer[0..self.used]).is_ok();
-            // Now we've released the buffer, we can draw the prompt
-            if valid {
-                write!(self.context, "\r").unwrap();
-                self.prompt(false);
-            }
-            // Grab the buffer again to render it to the screen
-            if let Ok(s) = core::str::from_utf8(&self.buffer[0..self.used]) {
-                write!(self.context, "{}", s).unwrap();
+            #[cfg(feature = "echo")]
+            {
+                // We have to do this song and dance because `self.prompt()` needs
+                // a mutable reference to self, and we can't have that while
+                // holding a reference to the buffer at the same time.
+                // This line grabs the buffer, checks it's OK, then releases it again
+                let valid = core::str::from_utf8(&self.buffer[0..self.used]).is_ok();
+                // Now we've released the buffer, we can draw the prompt
+                if valid {
+                    write!(self.context, "\r").unwrap();
+                    self.prompt(false);
+                }
+                // Grab the buffer again to render it to the screen
+                if let Ok(s) = core::str::from_utf8(&self.buffer[0..self.used]) {
+                    write!(self.context, "{}", s).unwrap();
+                }
             }
             Outcome::NeedMore
         } else {