Added auto updating TUI

src/app.rs

@@ -0,0 +1,71 @@
+use ratatui::{
+    Frame,
+    layout::Constraint,
+    style::{Color, Style},
+    widgets::{Block, Borders, Row, Table, TableState},
+};
+use sysinfo::System;
+
+pub struct SystemStats {
+    pub sys: System,
+    pub cpu_count: f32,
+}
+
+pub fn init_system() -> SystemStats {
+    let mut sys = System::new_all();
+    sys.refresh_cpu_usage();
+    let cpu_count = sys.cpus().len() as f32;
+    SystemStats { sys, cpu_count }
+}
+
+pub fn draw_ui(f: &mut Frame, sys: &mut System, cpu_count: f32, state: &mut TableState) {
+    let mut processes: Vec<_> = sys.processes().values().collect();
+    processes.sort_by(|a, b| {
+        b.cpu_usage()
+            .partial_cmp(&a.cpu_usage())
+            .unwrap_or(std::cmp::Ordering::Equal)
+    });
+
+    let rows: Vec<Row> = processes
+        .iter()
+        .map(|p| {
+            let cpu_usage = p.cpu_usage();
+            Row::new(vec![
+                p.pid().to_string(),
+                p.name().to_string_lossy().to_string(),
+                format!("{:.1}%", cpu_usage / cpu_count),
+                format!("{:.1}%", cpu_usage),
+            ])
+        })
+        .collect();
+
+    let widths = [
+        Constraint::Length(10),
+        Constraint::Fill(1),
+        Constraint::Length(10),
+        Constraint::Length(15),
+    ];
+
+    let table = Table::new(rows, widths)
+        .header(
+            Row::new(vec!["PID", "Name", "CPU %", "CPU Core %"]).style(Style::new().blue().bold()),
+        )
+        .block(
+            Block::default()
+                .borders(Borders::ALL)
+                .title(" Process Manager ")
+                .title_bottom(" Use ↑/↓ to Scroll, 'q' to Quit "),
+        )
+        .row_highlight_style(Style::new().bg(Color::Cyan).fg(Color::Black).bold())
+        .highlight_symbol(">> ");
+
+    f.render_stateful_widget(table, f.area(), state);
+}
+
+pub fn refresh_system_data(sys: &mut System) {
+    sys.refresh_processes_specifics(
+        sysinfo::ProcessesToUpdate::All,
+        true,
+        sysinfo::ProcessRefreshKind::nothing().with_cpu(),
+    );
+}

src/main.rs

@@ -1,41 +1,66 @@
-use std::thread;
-use std::time::Duration;
-use sysinfo::{ProcessRefreshKind, ProcessesToUpdate, System};
+mod app;
 
-fn main() {
-    let mut sys = System::new_all();
-    sys.refresh_cpu_usage();
-    let cpu_count = sys.cpus().len() as f32;
+use crossterm::event::{self, Event, KeyCode};
+use ratatui::widgets::TableState;
+use ratatui::{Terminal, backend::CrosstermBackend};
+use std::io::{self};
+use std::time::{Duration, Instant};
+
+use app::{draw_ui, init_system, refresh_system_data};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    crossterm::terminal::enable_raw_mode()?;
+    let mut stdout = io::stdout();
+    crossterm::execute!(stdout, crossterm::terminal::EnterAlternateScreen)?;
+
+    let backend = CrosstermBackend::new(stdout);
+    let mut terminal = Terminal::new(backend)?;
+    terminal.clear()?;
+    let mut stats = init_system();
+    let mut table_state = TableState::default();
+    table_state.select(Some(0));
+    let mut last_tick = Instant::now();
+    let tick_rate = Duration::from_secs(1);
 
     loop {
-        sys.refresh_processes_specifics(
-            sysinfo::ProcessesToUpdate::All,
-            true,
-            sysinfo::ProcessRefreshKind::nothing().with_cpu(),
-        );
-        print!("{esc}c", esc = 27 as char);
-        println!(
-            "{:<10} {:<30} {:<10} {:<10}",
-            "PID", "Name", "CPU %", "CPU Core %"
-        );
-        println!("{}", "-".repeat(50));
-        let mut procs: Vec<_> = sys.processes().values().collect();
-        procs.sort_by(|a, b| b.cpu_usage().partial_cmp(&a.cpu_usage()).unwrap());
-        for p in procs.iter() {
-            let normalized_cpu = p.cpu_usage() / cpu_count;
-            let mut name = p.name().to_string_lossy().into_owned();
-            if name.len() > 30 {
-                name.truncate(27);
-                name.push_str("...");
+        terminal.draw(|f| {
+            draw_ui(f, &mut stats.sys, stats.cpu_count, &mut table_state);
+        })?;
+
+        if last_tick.elapsed() >= tick_rate {
+            refresh_system_data(&mut stats.sys);
+            last_tick = Instant::now();
         }
-            println!(
-                "{:<10} {:<30} {:<.2}% {:<.2}%",
-                p.pid(),
-                p.name().to_string_lossy(),
-                normalized_cpu,
-                p.cpu_usage(),
-            );
+
+        if event::poll(Duration::from_millis(50))? {
+            if let Event::Key(key) = event::read()? {
+                match key.code {
+                    KeyCode::Char('q') => break,
+                    KeyCode::Down => {
+                        let i = match table_state.selected() {
+                            Some(i) => (i + 1).min(stats.sys.processes().len() - 1),
+                            None => 0,
+                        };
+                        table_state.select(Some(i));
                     }
-        thread::sleep(Duration::from_millis(1000));
+                    KeyCode::Up => {
+                        let i = match table_state.selected() {
+                            Some(i) => i.saturating_sub(1),
+                            None => 0,
+                        };
+                        table_state.select(Some(i));
                     }
+                    _ => {}
+                }
+            }
+        }
+    }
+
+    crossterm::execute!(
+        io::stdout(),
+        crossterm::terminal::LeaveAlternateScreen,
+        crossterm::cursor::Show
+    )?;
+    crossterm::terminal::disable_raw_mode()?;
+    Ok(())
 }