don't show empty elems and mouse support

src/tui/mod.rs

@@ -1,13 +1,15 @@
+use crossterm::{
+    event::{DisableMouseCapture, EnableMouseCapture, MouseButton, MouseEventKind},
+    terminal::{EnterAlternateScreen, LeaveAlternateScreen},
+};
 use ratatui_themes::{Theme, ThemeName};
 use std::{
-    cell::RefCell,
     fs::{self, DirEntry},
-    io,
+    io::{self, Stdout},
     ops::ControlFlow,
     path::{Path, PathBuf},
     process::exit,
     rc::Rc,
-    time::Instant,
 };
 use tui_widget_list::{ListBuilder, ListView};
 
@@ -23,11 +25,12 @@ use crate::tui::{
     widgets::styled::IntoStyled,
 };
 use ratatui::{
-    DefaultTerminal,
+    DefaultTerminal, Terminal,
     buffer::Buffer,
     crossterm::event::{self, Event, KeyCode, KeyEvent, KeyModifiers},
     layout::{Constraint, HorizontalAlignment, Layout, Rect},
-    style::{self, Style},
+    prelude::CrosstermBackend,
+    style::Style,
     text::Line,
     widgets::{
         Block, Clear, List, ListItem, ListState, Padding, Paragraph, StatefulWidget, Widget, Wrap,
@@ -75,11 +78,29 @@ perform action on selected target:
     alt-i                   inline
 ";
 
+fn setup_terminal() -> io::Result<Terminal<CrosstermBackend<Stdout>>> {
+    let mut stdout = io::stdout();
+    crossterm::terminal::enable_raw_mode()?;
+    {
+        use ::std::io::Write;
+        crossterm::queue!(stdout, EnterAlternateScreen, EnableMouseCapture)
+            .and_then(|()| ::std::io::Write::flush(stdout.by_ref()))
+    }?;
+    Terminal::new(CrosstermBackend::new(stdout))
+}
+
+fn teardown_terminal(terminal: &mut Terminal<CrosstermBackend<Stdout>>) -> io::Result<()> {
+    let mut stdout = io::stdout();
+    crossterm::terminal::disable_raw_mode()?;
+    crossterm::execute!(stdout, LeaveAlternateScreen, DisableMouseCapture,)?;
+    Ok(())
+}
+
 pub fn run(logs_dir: PathBuf, compiler_root: Option<PathBuf>, theme: ThemeName) {
-    let terminal = ratatui::init();
+    let mut terminal = setup_terminal().unwrap();
     let theme = Theme::new(theme);
-    let app_result = App::new(logs_dir, compiler_root, theme).run(terminal);
-    ratatui::restore();
+    let app_result = App::new(logs_dir, compiler_root, theme).run(&mut terminal);
+    teardown_terminal(&mut terminal).unwrap();
 
     if let Err(e) = app_result {
         eprintln!("error in tui: {e:?}");
@@ -92,6 +113,7 @@ enum Tab {
         files: Vec<DirEntry>,
         state: ListState,
         last_height: usize,
+        last_offset: usize,
     },
     LogViewer(LogViewer),
     Empty,
@@ -171,6 +193,7 @@ impl App {
                 files,
                 state: ListState::default(),
                 last_height: 0,
+                last_offset: 0,
             },
             Err(_) => Tab::Empty,
         }
@@ -192,6 +215,7 @@ impl App {
                 files,
                 state,
                 last_height,
+                last_offset: _,
             } => match key.code {
                 KeyCode::Char('j') | KeyCode::Down => state.select_next(),
                 KeyCode::Char('k') | KeyCode::Up => state.select_previous(),
@@ -337,7 +361,7 @@ impl App {
                 ratatui::restore();
                 let self_pid = nix::unistd::getpid();
                 let _ = nix::sys::signal::kill(self_pid, nix::sys::signal::SIGTSTP);
-                *terminal = ratatui::init();
+                *terminal = setup_terminal().unwrap();
             }
             KeyCode::Char('?') => {
                 if matches!(self.current_tab(), Tab::Help) {
@@ -357,20 +381,62 @@ impl App {
         ControlFlow::Continue(())
     }
 
-    fn run(mut self, mut terminal: DefaultTerminal) -> io::Result<()> {
+    fn run(mut self, terminal: &mut DefaultTerminal) -> io::Result<()> {
         loop {
             self.last_error.check_expired();
 
             terminal.draw(|frame| frame.render_widget(&mut self, frame.area()))?;
 
-            if let Event::Key(key) = event::read()? {
-                // to initialize, but we then do get manually for borrow reasons
-                self.current_tab();
+            match event::read()? {
+                Event::Key(key) => {
+                    // to initialize, but we then do get manually for borrow reasons
+                    self.current_tab();
 
-                // always active
-                if self.handle_generic_keycode(key, &mut terminal).is_break() {
-                    break Ok(());
+                    // always active
+                    if self.handle_generic_keycode(key, terminal).is_break() {
+                        break Ok(());
+                    }
                 }
+                Event::FocusGained => {}
+                Event::FocusLost => {}
+                Event::Mouse(mouse_event) => {
+                    if let MouseEventKind::Up(MouseButton::Left) = mouse_event.kind {
+                        if let Tab::LogViewer(lv) = self.current_tab() {
+                            lv.click(mouse_event.row);
+                        } else if let Tab::FileChooser {
+                            files,
+                            state,
+                            last_height: _,
+                            last_offset,
+                        } = self.current_tab()
+                        {
+                            if mouse_event.row as usize > *last_offset {
+                                let row = mouse_event.row as usize - *last_offset;
+                                if row < files.len() {
+                                    if state.selected() == Some(row)
+                                        && let Some(selected) = files.get(row)
+                                    {
+                                        match LogfileReader::new(&selected.path()) {
+                                            Ok(i) => {
+                                                self.current_file = Some(i.clone());
+                                                self.replace_tab(Tab::LogViewer(LogViewer::new(
+                                                    i.iter(),
+                                                )));
+                                            }
+                                            Err(_) => {
+                                                panic!()
+                                            }
+                                        }
+                                    } else {
+                                        state.select(Some(row));
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+                Event::Paste(_) => {}
+                Event::Resize(_, _) => {}
             }
         }
     }
@@ -489,6 +555,7 @@ impl Widget for &mut App {
                     files,
                     state,
                     last_height,
+                    last_offset,
                 } => {
                     let list = List::new(files.iter().map(|file| {
                         ListItem::new(file.file_name().to_string_lossy().into_owned())
@@ -497,10 +564,12 @@ impl Widget for &mut App {
                     .highlight_style(styles.highlighted);
 
                     *last_height = main_area.height as usize;
+                    *last_offset = main_area.y as usize;
 
                     StatefulWidget::render(list, main_area, buf, state);
                 }
                 Tab::LogViewer(lv) => {
+                    lv.last_offset = main_area.y as usize;
                     lv.update_num_items(main_area.height as usize);
 
                     let (items, selected_offset) = lv
@@ -549,6 +618,9 @@ impl Widget for &mut App {
                     .render(main_area, buf);
 
                     let items = lv.footer_fields();
+                    lv.last_fields_offset = footer_area.y as usize;
+                    lv.last_fields_height = items.len();
+
                     let width = 20;
                     let builder = ListBuilder::new(|cx| {
                         let Some((k, v)) = &items.get(cx.index) else {