Save resize events in asciicast file

src/format.rs

@@ -6,6 +6,7 @@ pub trait Writer {
     fn header(&mut self, header: &Header) -> io::Result<()>;
     fn output(&mut self, time: f64, data: &[u8]) -> io::Result<()>;
     fn input(&mut self, time: f64, data: &[u8]) -> io::Result<()>;
+    fn resize(&mut self, time: f64, size: (u16, u16)) -> io::Result<()>;
 }
 
 pub struct Header {

src/format/asciicast.rs

@@ -75,6 +75,10 @@ where
     fn input(&mut self, time: f64, data: &[u8]) -> io::Result<()> {
         self.write_event(Event::input(time, data))
     }
+
+    fn resize(&mut self, time: f64, size: (u16, u16)) -> io::Result<()> {
+        self.write_event(Event::resize(time, size))
+    }
 }
 
 pub fn open<R: BufRead>(
@@ -145,6 +149,14 @@ impl Event {
             data: String::from_utf8_lossy(data).to_string(),
         }
     }
+
+    pub fn resize(time: f64, size: (u16, u16)) -> Self {
+        Event {
+            time,
+            code: EventCode::Resize,
+            data: format!("{}x{}", size.0, size.1),
+        }
+    }
 }
 
 impl Display for EventCode {

src/format/raw.rs

@@ -22,4 +22,8 @@ impl<W: Write> super::Writer for Writer<W> {
     fn input(&mut self, _time: f64, _data: &[u8]) -> io::Result<()> {
         Ok(())
     }
+
+    fn resize(&mut self, time: f64, size: (u16, u16)) -> io::Result<()> {
+        Ok(())
+    }
 }

src/pty.rs

@@ -15,6 +15,7 @@ pub trait Recorder {
     fn start(&mut self, size: (u16, u16)) -> io::Result<()>;
     fn output(&mut self, data: &[u8]);
     fn input(&mut self, data: &[u8]);
+    fn resize(&mut self, size: (u16, u16));
 }
 
 pub fn exec<S: AsRef<str>, R: Recorder>(
@@ -193,6 +194,7 @@ fn copy<R: Recorder>(
                         if signal == SIGWINCH {
                             let winsize = get_tty_size(tty_fd, winsize_override);
                             set_pty_size(master_fd, &winsize);
+                            recorder.resize((winsize.ws_col, winsize.ws_row));
                         }
                     }
                 }
@@ -333,6 +335,7 @@ mod tests {
         }
 
         fn input(&mut self, _data: &[u8]) {}
+        fn resize(&mut self, _size: (u16, u16)) {}
     }
 
     impl TestRecorder {

src/recorder.rs

@@ -79,4 +79,8 @@ impl pty::Recorder for Recorder {
             // TODO use notifier for error reporting
         }
     }
+
+    fn resize(&mut self, size: (u16, u16)) {
+        let _ = self.writer.resize(self.elapsed_time(), size);
+    }
 }