add confirmation dialog on exit when there are unsaved changes

src/editor.rs

@@ -82,6 +82,10 @@ impl Editor {
 		"*untitled".into()
 	}
 
+	pub fn is_unsaved(&self) -> bool {
+		self.unsaved_changes
+	}
+
 	pub fn path(&self) -> Option<&PathBuf> {
 		self.path.as_ref()
 	}

src/main.rs

@@ -17,9 +17,9 @@ use std::{
 mod clipboard;
 mod editor;
 mod util;
-use crate::util::{color_highlight, color_reset};
 use clipboard::Clipboard;
 use editor::Editor;
+use util::{color_highlight, color_reset, read_yes_no};
 
 fn main() {
 	Navigator::new().run();
@@ -257,7 +257,16 @@ impl Navigator {
 		}
 	}
 
+	fn any_unsaved(&self) -> bool {
+		self.editors.iter().any(Editor::is_unsaved)
+	}
+
 	fn quit(&self) {
+		if self.any_unsaved() {
+			if !read_yes_no("Unsaved changes, quit anyway?", false) {
+				return;
+			}
+		}
 		disable_raw_mode().unwrap();
 		execute!(stdout(), LeaveAlternateScreen, cursor::Show).unwrap();
 		exit(0);

src/util.rs

@@ -7,6 +7,16 @@ use crossterm::{
 };
 use std::io::{stdout, Write};
 
+pub fn read_yes_no(prompt: &str, default: bool) -> bool {
+	let options = if default { "Y/n" } else { "y/N" };
+	let prompt = format!("{prompt} [{options}]: ");
+	match read_line(&prompt).and_then(|s| s.chars().next()) {
+		Some('Y' | 'y') => true,
+		Some('N' | 'n') => false,
+		_ => default,
+	}
+}
+
 pub fn read_line(prompt: &str) -> Option<String> {
 	let mut response = String::new();
 	let size = terminal::size().unwrap();