repline: Change newline behavior when not at end of input

TODO: This screws with the naming convention of home()/end()

repline/src/editor.rs

@@ -237,9 +237,18 @@ impl<'a> Editor<'a> {
         self.head.len() + self.tail.len()
     }
 
+    /// Returns true if the cursor is at the beginning
+    pub fn at_start(&self) -> bool {
+        self.head.is_empty()
+    }
+    /// Returns true if the cursor is at the end
+    pub fn at_end(&self) -> bool {
+        self.tail.is_empty()
+    }
+
     /// Returns true if the buffer is empty.
     pub fn is_empty(&self) -> bool {
-        self.head.is_empty() && self.tail.is_empty()
+        self.at_start() && self.at_end()
     }
 
     /// Returns true if the buffer ends with a given pattern

repline/src/repline.rs

@@ -5,7 +5,7 @@
 use crate::{editor::Editor, error::*, iter::*, raw::raw};
 use std::{
     collections::VecDeque,
-    io::{stdout, Bytes, Read, Result, Write},
+    io::{Bytes, Read, Result, Write, stdout},
 };
 
 /// Prompts the user, reads the lines. Not much more to it than that.
@@ -81,7 +81,12 @@ impl<'a, R: Read> Repline<'a, R> {
                 // ignore newlines, process line feeds. Not sure how cross-platform this is.
                 '\n' => {}
                 '\r' => {
-                    self.ed.push('\n', stdout)?;
+                    if self.ed.at_end() {
+                        self.ed.push('\n', stdout)?;
+                    } else {
+                        self.ed.end(stdout)?;
+                        writeln!(stdout)?;
+                    }
                     return Ok(self.ed.to_string());
                 }
                 // Ctrl+Backspace in my terminal