[tui] Add help text for last focused widget.

+ Fill in TODO help text for all widgets.

src/tui/app.rs

@@ -97,11 +97,18 @@ impl<'a> App<'a> {
             AppExplorer => self.explorer.component_state.help_text.clone(),
             AppLogger => self.logger.component_state.help_text.clone(),
         };
-        Paragraph::new(help)
+        Paragraph::new(
-            .style(Color::Gray)
+            concat!(
-            .wrap(Wrap { trim: false })
+                "ALT+Q: Focus project explorer | ALT+W: Focus editor | ALT+E: Focus logger |",
-            .centered()
+                " CTRL+C: Quit\n"
-            .render(area, buf);
+            )
+            .to_string()
+                + help.as_str(),
+        )
+        .style(Color::Gray)
+        .wrap(Wrap { trim: false })
+        .centered()
+        .render(area, buf);
     }
 
     fn draw_tabs(&self, area: Rect, buf: &mut Buffer) {

src/tui/editor.rs

@@ -33,7 +33,8 @@ impl Editor {
             event_handler: EditorEventHandler::default(),
             file_path: None,
             syntax_set: SyntaxSet::load_defaults_nonewlines(),
-            component_state: ComponentState::default().with_help_text("TODO: Vim help text"),
+            component_state: ComponentState::default()
+                .with_help_text("CTRL+S: Save file | Any other input is handled by vim"),
         }
     }
 

src/tui/explorer.rs

@@ -7,11 +7,12 @@ use ratatui::prelude::Style;
 use ratatui::style::{Color, Modifier};
 use ratatui::widgets::{Block, Borders, StatefulWidget};
 use std::fs;
+use std::path::PathBuf;
 use tui_tree_widget::{Tree, TreeItem, TreeState};
 
 #[derive(Debug)]
 pub struct Explorer<'a> {
-    pub(crate) root_path: std::path::PathBuf,
+    pub(crate) root_path: PathBuf,
     tree_items: TreeItem<'a, String>,
     tree_state: TreeState<String>,
     pub(crate) component_state: ComponentState,
@@ -27,7 +28,9 @@ impl<'a> Explorer<'a> {
             root_path: path.to_owned(),
             tree_items: Self::build_tree_from_path(path.to_owned())?,
             tree_state: TreeState::default(),
-            component_state: ComponentState::default().with_help_text("TODO: Explorer help text."),
+            component_state: ComponentState::default().with_help_text(
+                "(↑/k)/(↓/j): Select item | ←/h: Close folder | →/l/Enter: Open folder",
+            ),
         };
         Ok(explorer)
     }
@@ -140,14 +143,14 @@ impl<'a> Component for Explorer<'a> {
 
     fn handle_key_events(&mut self, key: KeyEvent) -> Result<Action> {
         let changed = match key.code {
-            KeyCode::Up => self.tree_state.key_up(),
+            KeyCode::Up | KeyCode::Char('k') => self.tree_state.key_up(),
-            KeyCode::Char('k') => self.tree_state.key_up(),
+            KeyCode::Down | KeyCode::Char('j') => self.tree_state.key_down(),
-            KeyCode::Down => self.tree_state.key_down(),
+            KeyCode::Left | KeyCode::Char('h') => {
-            KeyCode::Char('j') => self.tree_state.key_down(),
+                // Do not call key_left(); Calling it on a closed folder clears the selection.
-            KeyCode::Left => self.tree_state.key_left(),
+                let key = self.tree_state.selected().to_owned();
-            KeyCode::Char('h') => self.tree_state.key_left(),
+                self.tree_state.close(key.as_ref())
-            KeyCode::Right => self.tree_state.key_right(),
+            }
-            KeyCode::Char('l') => self.tree_state.key_right(),
+            KeyCode::Right | KeyCode::Char('l') => self.tree_state.key_right(),
             KeyCode::Enter => self.tree_state.toggle_selected(),
             _ => false,
         };

src/tui/logger.rs

@@ -19,12 +19,14 @@ impl Logger {
     }
 
     pub fn new() -> Self {
+        let state = TuiWidgetState::new();
+        state.transition(TuiWidgetEvent::HideKey);
         Self {
-            state: TuiWidgetState::new(),
+            state,
             component_state: ComponentState::default().with_help_text(concat!(
-                "Q: Quit | ↑/↓: Select target | f: Focus target",
+                "Space: Hide/show logging target selector panel | (↑/k)/(↓/j): Select target |",
-                " | ←/→: Display level | +/-: Filter level | Space: Toggle hidden targets",
+                " (←/h)/(→/l): Display level | f: Focus target | +/-: Filter level |",
-                " | h: Hide target selector | PageUp/Down: Scroll | Esc: Cancel scroll"
+                " v: Toggle filtered targets visibility | PageUp/Down: Scroll | Esc: Cancel scroll"
             )),
         }
     }
@@ -62,17 +64,17 @@ impl Component for Logger {
 
     fn handle_key_events(&mut self, key: KeyEvent) -> anyhow::Result<Action> {
         match key.code {
-            KeyCode::Char(' ') => self.state.transition(TuiWidgetEvent::SpaceKey),
+            KeyCode::Char('v') => self.state.transition(TuiWidgetEvent::SpaceKey),
             KeyCode::Esc => self.state.transition(TuiWidgetEvent::EscapeKey),
             KeyCode::PageUp => self.state.transition(TuiWidgetEvent::PrevPageKey),
             KeyCode::PageDown => self.state.transition(TuiWidgetEvent::NextPageKey),
-            KeyCode::Up => self.state.transition(TuiWidgetEvent::UpKey),
+            KeyCode::Up | KeyCode::Char('k') => self.state.transition(TuiWidgetEvent::UpKey),
-            KeyCode::Down => self.state.transition(TuiWidgetEvent::DownKey),
+            KeyCode::Down | KeyCode::Char('j') => self.state.transition(TuiWidgetEvent::DownKey),
-            KeyCode::Left => self.state.transition(TuiWidgetEvent::LeftKey),
+            KeyCode::Left | KeyCode::Char('h') => self.state.transition(TuiWidgetEvent::LeftKey),
-            KeyCode::Right => self.state.transition(TuiWidgetEvent::RightKey),
+            KeyCode::Right | KeyCode::Char('l') => self.state.transition(TuiWidgetEvent::RightKey),
             KeyCode::Char('+') => self.state.transition(TuiWidgetEvent::PlusKey),
             KeyCode::Char('-') => self.state.transition(TuiWidgetEvent::MinusKey),
-            KeyCode::Char('h') => self.state.transition(TuiWidgetEvent::HideKey),
+            KeyCode::Char(' ') => self.state.transition(TuiWidgetEvent::HideKey),
             KeyCode::Char('f') => self.state.transition(TuiWidgetEvent::FocusKey),
             _ => (),
         }