show best matches asap in fuzzy file finder

src/app/mod.rs

@@ -41,7 +41,8 @@ fn searcher() -> SimSearch<usize> {
     SimSearch::new_with(
         SearchOptions::new()
             .stop_words(vec![std::path::MAIN_SEPARATOR_STR.to_string()])
-            .stop_whitespace(false),
+            .stop_whitespace(false)
+            .threshold(0.0),
     )
 }
 

src/app/widgets.rs

@@ -10,7 +10,7 @@ use ratatui::{
     text::{Line, Text, ToLine},
     widgets::{
         Block, Borders, Clear, List, ListItem, ListState, Padding, Paragraph, Row, Table,
-        TableState, Widget,
+        TableState, Widget, Wrap,
     },
 };
 use tui_logger::{TuiLoggerLevelOutput, TuiLoggerWidget, TuiWidgetState};
@@ -27,6 +27,8 @@ static MAIN_MENU: LazyLock<Line> = LazyLock::new(|| {
         "<L>".blue().bold(),
         " Previous Screen ".into(),
         "<ESC>".blue().bold(),
+        " Help ".into(),
+        "<H|?>".blue().bold(),
         " Quit ".into(),
         "<Q>".blue().bold(),
     ])
@@ -133,8 +135,6 @@ impl Widget for &mut App {
 
         let subscreen_margin = Margin::new(1, 2);
 
-        // it's safe to call `unwrap()` here because we ensure there's always at least
-        // one element in `self.screen`; see the `self.pop()` method
         let current_screen = self.screen();
         match current_screen {
             CurrentScreen::Main => {
@@ -160,7 +160,8 @@ impl Widget for &mut App {
                 );
             }
             CurrentScreen::Help => {
-                // TODO: display help
+                outer_frame(&current_screen, &MAIN_MENU, area, buf);
+                help_screen(area.inner(subscreen_margin), buf);
             }
             CurrentScreen::Logging | CurrentScreen::Stopping => {
                 outer_frame(&current_screen, &LOGGING_MENU, area, buf);
@@ -251,18 +252,78 @@ fn outer_frame(screen: &CurrentScreen, menu: &Line, area: Rect, buf: &mut Buffer
         .render(area, buf);
 }
 
-fn text_popup(text: &str, title: &str, area: Rect, buf: &mut Buffer) {
+fn help_screen(area: Rect, buf: &mut Buffer) {
-    let title = Line::from(title.bold());
+    let intro = "JocalSend is a mode-based application that responds to key-presses. Most modes support the following key bindings:".to_line().centered();
-    let block = Block::bordered().title(title.centered());
+    let intro = Paragraph::new(intro).wrap(Wrap { trim: true });
+    let spacer = "".to_line().centered();
+    let main_bindings = vec![
+        Row::new(vec!["".to_line(), spacer.clone(), "".to_line()]),
+        Row::new(vec![
+            // Sending
+            "Send data".bold().into_right_aligned_line(),
+            spacer.clone(),
+            "S".bold().into_left_aligned_line(),
+        ]),
+        // Receiving
+        Row::new(vec![
+            "Manage incoming data requests (receive data)"
+                .bold()
+                .into_right_aligned_line(),
+            spacer.clone(),
+            "R".bold().into_left_aligned_line(),
+        ]),
+        // logging
+        Row::new(vec![
+            "View logs and change log level"
+                .bold()
+                .into_right_aligned_line(),
+            spacer.clone(),
+            "L".bold().into_left_aligned_line(),
+        ]),
+        // misc: pop
+        Row::new(vec![
+            "Go to previous screen".bold().into_right_aligned_line(),
+            spacer.clone(),
+            "ESC".bold().into_left_aligned_line(),
+        ]),
+        // misc: main menu
+        Row::new(vec![
+            "Go to the main screen".bold().into_right_aligned_line(),
+            spacer.clone(),
+            "M".bold().into_left_aligned_line(),
+        ]),
+        // misc: quit
+        Row::new(vec![
+            "Quit the application".bold().into_right_aligned_line(),
+            spacer.clone(),
+            "Q".bold().into_left_aligned_line(),
+        ]),
+        // misc: help
+        Row::new(vec![
+            "This help screen".bold().into_right_aligned_line(),
+            spacer.clone(),
+            "H or ?".bold().into_left_aligned_line(),
+        ]),
+    ];
+
+    let layout = Layout::vertical(vec![Constraint::Max(3), Constraint::Min(1)]);
+    let [intro_area, bindings_area] = layout.areas(area);
+
+    let widths = vec![
+        Constraint::Percentage(50),
+        Constraint::Max(6),
+        Constraint::Percentage(50),
+    ];
+    let main_bindings = Table::new(main_bindings, widths).header(Row::new(vec![
+        "Action".bold().into_right_aligned_line(),
+        spacer,
+        "Key input".bold().into_left_aligned_line(),
+    ]));
+
     Clear.render(area, buf);
 
-    block.render(area, buf);
+    intro.render(intro_area, buf);
-
+    main_bindings.render(bindings_area, buf);
-    let (_, len) = unicode_segmentation::UnicodeSegmentation::graphemes(text, true).size_hint();
-    let len = len.unwrap_or(text.len()) as u16 + 2;
-    let area = centered_rect(area, Constraint::Length(len), Constraint::Length(1));
-
-    Paragraph::new(text).centered().yellow().render(area, buf);
 }
 
 fn logger(area: Rect, buf: &mut Buffer) {
@@ -418,3 +479,17 @@ fn centered_rect(area: Rect, horizontal: Constraint, vertical: Constraint) -> Re
     let [area] = Layout::vertical([vertical]).flex(Flex::Center).areas(area);
     area
 }
+
+fn text_popup(text: &str, title: &str, area: Rect, buf: &mut Buffer) {
+    let title = Line::from(title.bold());
+    let block = Block::bordered().title(title.centered());
+    Clear.render(area, buf);
+
+    block.render(area, buf);
+
+    let (_, len) = unicode_segmentation::UnicodeSegmentation::graphemes(text, true).size_hint();
+    let len = len.unwrap_or(text.len()) as u16 + 2;
+    let area = centered_rect(area, Constraint::Length(len), Constraint::Length(1));
+
+    Paragraph::new(text).centered().yellow().render(area, buf);
+}