Add terminfo implementation for animating output

src/lib.rs

@@ -193,6 +193,24 @@ pub trait Terminal<T: Write>: Write {
     /// was an I/O error.
     fn reset(&mut self) -> io::Result<bool>;
 
+    /// Moves the cursor up one line.
+    ///
+    /// Returns `Ok(true)` if the cursor was moved, `Ok(false)` otherwise, and `Err(e)`
+    /// if there was an I/O error.
+    fn cursor_up(&mut self) -> io::Result<bool>;
+
+    /// Deletes the text from the cursor location to the end of the line.
+    ///
+    /// Returns `Ok(true)` if the text was deleted, `Ok(false)` otherwise, and `Err(e)`
+    /// if there was an I/O error.
+    fn delete_line(&mut self) -> io::Result<bool>;
+
+    /// Moves the cursor to the left edge of the current line.
+    ///
+    /// Returns `Ok(true)` if the text was deleted, `Ok(false)` otherwise, and `Err(e)`
+    /// if there was an I/O error.
+    fn carriage_return(&mut self) -> io::Result<bool>;
+
     /// Gets an immutable reference to the stream inside
     fn get_ref<'a>(&'a self) -> &'a T;
 

src/terminfo/mod.rs

@@ -205,6 +205,18 @@ impl<T: Write+Send> Terminal<T> for TerminfoTerminal<T> {
         self.out.write_all(&cmd).map(|_|true)
     }
 
+    fn cursor_up(&mut self) -> io::Result<bool> {
+        self.apply_cap("cuu1", &[])
+    }
+
+    fn delete_line(&mut self) -> io::Result<bool> {
+        self.apply_cap("dl", &[])
+    }
+
+    fn carriage_return(&mut self) -> io::Result<bool> {
+        self.apply_cap("cr", &[])
+    }
+
     fn get_ref<'a>(&'a self) -> &'a T { &self.out }
 
     fn get_mut<'a>(&'a mut self) -> &'a mut T { &mut self.out }