refactor: Reduce nesting in root module

Author: lj3954

tui/src/root.rs

@@ -8,62 +8,50 @@ use ratatui::{
 };
 use std::io;
 
-pub fn check_root(terminal: &mut Terminal<CrosstermBackend<io::Stdout>>) -> io::Result<bool> {
-    if nix::unistd::geteuid().is_root() {
-        terminal.draw(|frame| {
-            let root_warn = Paragraph::new(
-                r#"
+const ROOT_WARNING: &str = r#"
 !!!!!!!!!!!!!! YOU ARE ABOUT TO RUN LINUTIL AS ROOT !!!!!!!!!!!!!!
 This utility prioritizes compatibility with non-root environments.
 Some scripts may work without any issues, some may not.
 You have been warned!
 !!!!!!!!!!!!!!!!!!!!!! PROCEED WITH CAUTION !!!!!!!!!!!!!!!!!!!!!!
 Press [y] to continue, [n] to abort
-"#,
-            )
+"#;
+
+pub fn check_root(terminal: &mut Terminal<CrosstermBackend<io::Stdout>>) -> io::Result<bool> {
+    if !nix::unistd::geteuid().is_root() {
+        return Ok(true);
+    }
+    terminal.draw(|frame| {
+        let root_warn = Paragraph::new(ROOT_WARNING)
             .white()
             .on_black()
             .alignment(Alignment::Center)
             .style(Style::default().bold())
             .wrap(Wrap { trim: true });
 
-            let rects = Layout::vertical([
-                Constraint::Fill(1),
-                Constraint::Length(10),
-                Constraint::Fill(1),
-            ])
-            .split(frame.area());
+        let rects = Layout::vertical([
+            Constraint::Fill(1),
+            Constraint::Length(10),
+            Constraint::Fill(1),
+        ])
+        .split(frame.area());
 
-            let centered = rects[1];
+        let centered = rects[1];
 
-            frame.render_widget(root_warn, centered);
-        })?;
+        frame.render_widget(root_warn, centered);
+    })?;
 
-        loop {
-            match event::read()? {
-                Event::Key(
-                    KeyEvent {
-                        code: KeyCode::Char('y'),
-                        ..
-                    }
-                    | KeyEvent {
-                        code: KeyCode::Char('Y'),
-                        ..
-                    },
-                ) => break,
-                Event::Key(
-                    KeyEvent {
-                        code: KeyCode::Char('n'),
-                        ..
-                    }
-                    | KeyEvent {
-                        code: KeyCode::Char('N'),
-                        ..
-                    },
-                ) => return Ok(false),
+    loop {
+        if let Event::Key(KeyEvent {
+            code: KeyCode::Char(ch),
+            ..
+        }) = event::read()?
+        {
+            match ch.to_ascii_lowercase() {
+                'y' => return Ok(true),
+                'n' => return Ok(false),
                 _ => {}
             }
         }
     }
-    Ok(true)
 }