Use checked subtraction for backspace

Some shells will send a backspace at column 0, apparently.
2016-12-10 10:14:45 -08:00 · 2016-12-10 10:14:45 -08:00 · b6c372ab48
parent d19e6e38a4
commit b6c372ab48
1 changed files with 3 additions and 1 deletions
--- a/src/term.rs
+++ b/src/term.rs
@ -570,7 +570,9 @@ impl ansi::Handler for Term {
    #[inline]
    fn backspace(&mut self) {
        debug_println!("backspace");
-        self.cursor.col -= 1;
+        if self.cursor.col > Column(0) {
+            self.cursor.col -= 1;
+        }
    }

    /// Carriage return