Fixed bug flush_buf(). (#42)

* Fixed bug flush_buf() issue 42.

docs/ReleaseNotes.md

@@ -1,3 +1,6 @@
+# Changes crossterm to 0.4.3
+- Fixed bug [issue 41](https://github.com/TimonPost/crossterm/issues/41)
+
 #  Changes crossterm to 0.4.2
 - Added functionality to make a styled object writable to screen [issue 33](https://github.com/TimonPost/crossterm/issues/33)
 - Added unit tests.

examples/examples.rs

@@ -15,37 +15,6 @@ mod cursor;
 mod some_types;
 mod input;
 
-use std::io::Write;
-
-use crossterm::style::{style, Color, DisplayableObject};
-use crossterm::terminal::terminal;
-use crossterm::Screen;
-
-use crossterm::output::TerminalOutput;
-use crossterm::cursor::TerminalCursor;
-
-use crossterm::terminal::Terminal;
-use std::{thread,time};
-
 fn main()
 {
-    let screen = Screen::new(false);
-    let terminal = Terminal::new(&screen.stdout);
-
-    // get terminal size
-    let (x, y) = terminal.terminal_size();
-
-    // set size to 30, 50
-    terminal.set_size(30,50);
-
-    // if we uncomment the line below the code will work perfectly fine and we will get the new dimensions.
-    // if we comment this line the terminal dimensions gotten from terminal_size() are equal to the old dimensions.
-
-    // thread::sleep(time::Duration::from_millis(20));
-
-    // get new dimensions
-    let (x_new, y_new) = terminal.terminal_size();
-
-    println!("old width: {} old height: {}", x, y);
-    println!("new width: {} new height: {}", x_new, y_new);
 }

src/common/screen/screen.rs

@@ -102,14 +102,16 @@ impl Screen
    ///
    /// This function is useful if you want to build up some output and when you are ready you could flush the output to the screen.
     pub fn write_buf(&mut self, buf: &[u8]) -> Result<usize> {
-        self.buffer.write(buf);
+        self.buffer.write(buf)?;
         Ok(buf.len())
     }
 
     /// Flush the internal buffer to the screen.
     pub fn flush_buf(&mut self) -> Result<()> {
-        self.stdout.write_buf(&self.buffer);
-        self.stdout.flush()
+        self.stdout.write_buf(&self.buffer)?;
+        self.stdout.flush()?;
+        self.buffer.clear();
+        Ok(())
     }
 
     /// This will disable the drop which will cause raw modes not to be undone on drop of `Screen`.