Prevent crashes when terminal is too small

src/main.rs

@@ -43,6 +43,22 @@ fn main() -> Result<()> {
             let mut area = frame.size();
             frame.render_widget(Block::default().style(Style::default().bg(Color::Green)), area);
 
+            // don't draw stuff except an info box if the terminal is too small (less than 80x25)
+            // to prevent the read drawing code from crashing the game.
+            if area.width < 80 || area.height < 25 {
+                let block = Block::default()
+                    .title("Info")
+                    .borders(Borders::ALL)
+                    .border_style(Style::default().fg(Color::White))
+                    .border_type(BorderType::Rounded)
+                    .style(Style::default().bg(Color::Black));
+                let paragraph = Paragraph::new("Terminal needs to be at leas 80x25!")
+                    .block(block)
+                    .wrap(Wrap { trim: true });
+                frame.render_widget(paragraph, area);
+                return
+            }
+
             if area.width > 80 {
                 area.x = (area.width - 80) / 2;
                 area.width = 80;