Add a decent header line

src/interactive/widgets/header.rs

@@ -0,0 +1,51 @@
+use tui::buffer::Buffer;
+use tui::layout::Rect;
+use tui::style::{Color, Modifier, Style};
+use tui::widgets::{Paragraph, Text, Widget};
+
+pub struct Header;
+
+impl Widget for Header {
+    fn draw(&mut self, area: Rect, buf: &mut Buffer) {
+        let bg_color = Color::LightYellow;
+        let text_color = Color::Black;
+        let standard = Style {
+            fg: text_color,
+            bg: bg_color,
+            ..Default::default()
+        };
+        let modified = |text: &'static str, modifier| {
+            Text::Styled(
+                text.into(),
+                Style {
+                    modifier,
+                    ..standard
+                },
+            )
+        };
+        let bold = |text: &'static str| modified(text, Modifier::BOLD);
+        let italic = |text: &'static str| modified(text, Modifier::UNDERLINED);
+        let text = |text: &'static str| Text::Styled(text.into(), standard);
+
+        let lines = [
+            bold(" D"),
+            text("isk "),
+            bold("U"),
+            text("sage "),
+            bold("A"),
+            text("alyzer v"),
+            text(env!("CARGO_PKG_VERSION")),
+            text("    "),
+            italic("(press "),
+            modified("?", Modifier::BOLD|Modifier::UNDERLINED),
+            italic(" for help)"),
+        ];
+        Paragraph::new(lines.iter())
+            .style(Style {
+                fg: text_color,
+                bg: bg_color,
+                ..Default::default()
+            })
+            .draw(area, buf);
+    }
+}

src/interactive/widgets/help.rs

@@ -59,7 +59,7 @@ impl Widget for HelpPane {
                     "close the current pain. Closes the application if no pane is open.",
                 );
                 hotkey("<tab>", "Cycle between all open panes");
-                hotkey("?", "Show the help pane");
+                hotkey("?", "Show or hide the help pane");
                 spacer();
             }
             title("Keys for Navigation");

src/interactive/widgets/main.rs

@@ -1,6 +1,6 @@
 use crate::{
     interactive::{
-        widgets::{Entries, Footer, HelpPane, ListState},
+        widgets::{Entries, Footer, Header, HelpPane, ListState},
         AppState, DisplayOptions, FocussedPane,
     },
     traverse::Traversal,
@@ -44,9 +44,16 @@ impl<'a, 'b, 'c> Widget for MainWindow<'a, 'b, 'c> {
         } = self;
         let regions = Layout::default()
             .direction(Direction::Vertical)
-            .constraints([Constraint::Max(256), Constraint::Length(1)].as_ref())
+            .constraints(
+                [
+                    Constraint::Length(1),
+                    Constraint::Max(256),
+                    Constraint::Length(1),
+                ]
+                .as_ref(),
+            )
             .split(area);
-        let (entries_area, footer_area) = (regions[0], regions[1]);
+        let (header_area, entries_area, footer_area) = (regions[0], regions[1], regions[2]);
         let (entries_area, help_area_state) = match state.help_pane {
             Some(state) => {
                 let regions = Layout::default()
@@ -70,6 +77,8 @@ impl<'a, 'b, 'c> Widget for MainWindow<'a, 'b, 'c> {
             FocussedPane::Main => (white, grey),
             FocussedPane::Help => (grey, white),
         };
+
+        Header.draw(header_area, buf);
         Entries {
             tree: &tree,
             root: state.root,

src/interactive/widgets/mod.rs

@@ -1,11 +1,13 @@
 mod entries;
 mod footer;
+mod header;
 mod help;
 mod list;
 mod main;
 
 pub use entries::*;
 pub use footer::*;
+pub use header::*;
 pub use help::*;
 pub use list::*;
 pub use main::*;