Add support for setting window title

src/frame.rs

@@ -7,6 +7,7 @@ use crate::{Pos, Size, Styled, WidthDb};
 pub struct Frame {
     pub(crate) widthdb: WidthDb,
     pub(crate) buffer: Buffer,
+    pub(crate) title: Option<String>,
 }
 
 impl Frame {
@@ -24,6 +25,7 @@ impl Frame {
 
     pub fn reset(&mut self) {
         self.buffer.reset();
+        self.title = None;
     }
 
     pub fn cursor(&self) -> Option<Pos> {
@@ -42,6 +44,10 @@ impl Frame {
         self.set_cursor(None);
     }
 
+    pub fn set_title(&mut self, title: Option<String>) {
+        self.title = title;
+    }
+
     pub fn widthdb(&mut self) -> &mut WidthDb {
         &mut self.widthdb
     }

src/terminal.rs

@@ -11,7 +11,7 @@ use crossterm::event::{
 use crossterm::style::{PrintStyledContent, StyledContent};
 use crossterm::terminal::{
     BeginSynchronizedUpdate, Clear, ClearType, EndSynchronizedUpdate, EnterAlternateScreen,
-    LeaveAlternateScreen,
+    LeaveAlternateScreen, SetTitle,
 };
 use crossterm::{ExecutableCommand, QueueableCommand};
 
@@ -253,6 +253,7 @@ impl Terminal {
 
         self.draw_differences()?;
         self.update_cursor()?;
+        self.update_title()?;
 
         Ok(())
     }
@@ -287,4 +288,11 @@ impl Terminal {
         self.out.queue(Hide)?;
         Ok(())
     }
+
+    fn update_title(&mut self) -> io::Result<()> {
+        if let Some(title) = &self.frame.title {
+            self.out.queue(SetTitle(title.clone()))?;
+        }
+        Ok(())
+    }
 }