Fix #573. Ensure we don't write 0 bytes to pty

Any action that results in 0 bytes, such as pasting 0 bytes
from the clipboard hangs the terminal (`pbcopy </dev/null`
followed by ctrl-v), hangs the terminal on both macOS and
Linux. This ensures we never send 0 bytes.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/event_loop.rs b/src/event_loop.rs
index 2cee471c..8db5cddd 100644
--- a/src/event_loop.rs
+++ b/src/event_loop.rs
@@ -60,6 +60,10 @@ impl event::Notify for Notifier {
         where B: Into<Cow<'static, [u8]>>
     {
         let bytes = bytes.into();
+        // terminal hangs if we send 0 bytes through.
+        if bytes.len() == 0 {
+            return
+        }
         match self.0.send(Msg::Input(bytes)) {
             Ok(_) => (),
             Err(_) => panic!("expected send event loop msg"),