Trying to improve resize detection and processing

examples/widgets_basic.rs

@@ -1,6 +1,8 @@
 //! This example shows how to make a basic widget that accumulates
 //! text input and renders it to the screen
 extern crate failure;
+#[cfg(unix)]
+extern crate libc;
 extern crate termwiz;
 
 use failure::Error;
@@ -20,6 +22,14 @@ struct MainScreen {
     cursor: Cell<ParentRelativeCoords>,
 }
 
+#[cfg(unix)]
+fn catch_winch() {
+    extern "C" fn dummy(_: libc::c_int) {}
+    unsafe {
+        libc::signal(libc::SIGWINCH, dummy as usize);
+    }
+}
+
 impl WidgetImpl for MainScreen {
     fn process_event(&mut self, event: &WidgetEvent) -> EventDisposition {
         match event {
@@ -43,6 +53,8 @@ impl WidgetImpl for MainScreen {
 
     fn render_to_surface(&self, surface: &mut Surface) {
         surface.add_change(Change::ClearScreen(AnsiColor::Blue.into()));
+        let dims = surface.dimensions();
+        surface.add_change(format!("surface size is {:?}\r\n", dims));
         surface.add_change(self.buf.clone());
         // Allow the surface rendering code to figure out where the
         // cursor ends up, then stash a copy of that information for
@@ -61,6 +73,9 @@ impl WidgetImpl for MainScreen {
 }
 
 fn main() -> Result<(), Error> {
+    #[cfg(unix)]
+    catch_winch();
+
     let caps = Capabilities::new_from_env()?;
 
     let mut buf = BufferedTerminal::new(new_terminal(caps)?)?;
@@ -91,6 +106,9 @@ fn main() -> Result<(), Error> {
             }
         }
 
+        if buf.check_for_resize()? {
+            buf.add_change(Change::ClearScreen(Default::default()));
+        }
         screen.render_to_screen(&mut buf)?;
         buf.flush()?;
     }

src/terminal/buffered.rs

@@ -97,8 +97,8 @@ impl<T: Terminal> BufferedTerminal<T> {
         let size = self.terminal.get_screen_size()?;
         let (width, height) = self.surface.dimensions();
 
-        if width != size.cols || height != size.rows {
-            self.surface.resize(width, height);
+        if (width != size.cols) || (height != size.rows) {
+            self.surface.resize(size.cols, size.rows);
             Ok(true)
         } else {
             Ok(false)

src/terminal/unix.rs

@@ -331,6 +331,7 @@ impl Terminal for UnixTerminal {
                 Ok(result)
             }
             Err(ref e) if e.kind() == ErrorKind::WouldBlock => Ok(None),
+            Err(ref e) if e.kind() == ErrorKind::Interrupted => Ok(None),
             Err(e) => Err(format_err!("failed to read input {}", e)),
         }
     }