can move left

src/line.rs

@@ -4,7 +4,10 @@ use anyhow::Result;
 use windows::Win32::System::Console;
 
 pub struct Line {
+    /// the current contents of the line
     chars: Vec<char>,
+
+    /// the cursor position of our dit head within the vector of characters that we store as chars
     cursor: usize,
 }
 
@@ -44,4 +47,14 @@ impl Line {
         self.chars.insert(self.cursor, c);
         self.cursor += 1;
     }
+
+    pub fn tail(&self) -> String {
+        let mut start = self.cursor;
+        if start > 0 {
+            start -= 1;
+        }
+
+        let chars = &self.chars[start..];
+        chars.iter().collect()
+    }
 }

src/main.rs

@@ -198,18 +198,23 @@ fn main() -> Result<()> {
                 if !event.char.is_control() {
                     line.insert(event.char);
 
-                    let mut buf = [0 as u8; 8];
-                    let s = event.char.encode_utf8(&mut buf);
+                    let tail = line.tail();
+                    let n = tail.chars().count();
 
                     // write everything from the current line cursor out to the output buffer. Then
                     // rewind the cursor in the output buffer to where it was.
                     unsafe {
                         Error::check(Console::WriteConsoleA(
                             stdout,
-                            s.as_bytes(),
+                            tail.as_bytes(),
                             None,
                             None,
                         ))?;
+
+                        if n > 1 {
+                            let text = format!("\x1b[{}D", n-1);
+                            Error::check(Console::WriteConsoleA(stdout, text.as_bytes(), None, None))?;
+                        }
                     }
                     continue;
                 }
@@ -220,7 +225,7 @@ fn main() -> Result<()> {
                 debug!("back!");
                 line.back();
                 unsafe {
-                    let text = "\x1b[D";
+                    let text = "\x1b[D"; // lol this sucks
                     Error::check(Console::WriteConsoleA(stdout, text.as_bytes(), None, None))?;
                 }
             },