top: tui impl info bar

src/uu/top/src/top.rs

@@ -66,6 +66,11 @@ impl ProcList {
     }
 }
 
+pub(crate) struct InfoBar {
+    pub title: String,
+    pub content: String,
+}
+
 #[uucore::main]
 pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     let matches = uu_app().try_get_matches_from(args)?;
@@ -107,6 +112,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     let data = Arc::new(RwLock::new((
         Header::new(&tui_stat.read().unwrap()),
         ProcList::new(&settings, &tui_stat.read().unwrap()),
+        None,
     )));
 
     // update
@@ -122,7 +128,9 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
                 let header = Header::new(&tui_stat.read().unwrap());
                 let proc_list = ProcList::new(&settings, &tui_stat.read().unwrap());
                 tui_stat.write().unwrap().input_message = None;
-                *data.write().unwrap() = (header, proc_list);
+                let mut data = data.write().unwrap();
+                data.0 = header;
+                data.1 = proc_list;
                 should_update.store(true, Ordering::Relaxed);
             }
         });
@@ -231,11 +239,7 @@ fn collect(settings: &Settings, fields: &[String], tui_stat: &TuiStat) -> Vec<Ve
     }
     collected
         .into_iter()
-        .map(|it| {
-            it.into_iter()
-                .map(|c| c.as_string(tui_stat))
-                .collect()
-        })
+        .map(|it| it.into_iter().map(|c| c.as_string(tui_stat)).collect())
         .collect()
 }
 

src/uu/top/src/tui/input.rs

@@ -7,7 +7,7 @@ use crate::header::Header;
 use crate::platform::get_numa_nodes;
 use crate::tui::stat::{CpuValueMode, TuiStat};
 use crate::Filter::{EUser, User};
-use crate::{selected_fields, try_into_uid, ProcList, Settings};
+use crate::{selected_fields, try_into_uid, InfoBar, ProcList, Settings};
 use ratatui::crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::RwLock;
@@ -40,7 +40,7 @@ pub fn handle_input(
     e: Event,
     settings: &Settings,
     tui_stat: &RwLock<TuiStat>,
-    data: &RwLock<(Header, ProcList)>,
+    data: &RwLock<(Header, ProcList, Option<InfoBar>)>,
     should_update: &AtomicBool,
 ) -> bool {
     let input_mode = { tui_stat.read().unwrap().input_mode };
@@ -338,7 +338,7 @@ fn handle_input_value(
     input_event: InputEvent,
     settings: &Settings,
     tui_stat: &RwLock<TuiStat>,
-    data: &RwLock<(Header, ProcList)>,
+    data: &RwLock<(Header, ProcList, Option<InfoBar>)>,
     should_update: &AtomicBool,
 ) {
     match input_event {

src/uu/top/src/tui/mod.rs

@@ -13,7 +13,7 @@ use std::borrow::Cow;
 use crate::header::{format_memory, Header};
 use crate::tui::color::TuiColor;
 use crate::tui::stat::{CpuGraphMode, MemoryGraphMode, TuiStat};
-use crate::ProcList;
+use crate::{InfoBar, ProcList};
 use ratatui::prelude::*;
 use ratatui::widgets::{Cell, Paragraph, Row, Table, TableState};
 use std::cmp::min;
@@ -22,19 +22,21 @@ pub struct Tui<'a> {
     settings: &'a crate::Settings,
     header: &'a Header,
     proc_list: &'a ProcList,
+    info_bar: &'a Option<InfoBar>,
     stat: &'a mut TuiStat,
 }
 
 impl<'a> Tui<'a> {
     pub fn new(
         settings: &'a crate::Settings,
-        data: &'a (Header, ProcList),
+        data: &'a (Header, ProcList, Option<InfoBar>),
         stat: &'a mut TuiStat,
     ) -> Self {
         Self {
             settings,
             header: &data.0,
             proc_list: &data.1,
+            info_bar: &data.2,
             stat,
         }
     }
@@ -66,6 +68,19 @@ impl<'a> Tui<'a> {
         height
     }
 
+    fn calc_info_bar_height(&self, width: u16) -> u16 {
+        if let Some(info_bar) = &self.info_bar {
+            let lines: u16 = info_bar
+                .content
+                .lines()
+                .map(|s| (s.len() as u16).div_ceil(width))
+                .sum();
+            lines + 1 // 1 for title
+        } else {
+            0
+        }
+    }
+
     fn calc_list_coordinates(&self) -> (usize, usize) {
         let list_total = self.proc_list.collected.len();
         let list_offset = self.stat.list_offset;
@@ -506,6 +521,19 @@ impl<'a> Tui<'a> {
         let table = Table::new(rows, constraints.clone()).header(header);
         StatefulWidget::render(table, area, buf, &mut state);
     }
+
+    fn render_info_bar(&self, area: Rect, buf: &mut Buffer) {
+        if let Some(info_bar) = self.info_bar.as_ref() {
+            let constraints = [Constraint::Length(1), Constraint::Min(1)];
+            let layout = Layout::new(Direction::Vertical, constraints).split(area);
+            Line::from(Span::styled(
+                format!("{:<width$}", &info_bar.title, width = area.width as usize),
+                Style::default().bg_secondary(self.stat.colorful),
+            ))
+            .render(layout[0], buf);
+            Span::raw(&info_bar.content).render(layout[1], buf);
+        }
+    }
 }
 
 impl Widget for Tui<'_> {
@@ -524,6 +552,7 @@ impl Widget for Tui<'_> {
                 Constraint::Length(self.calc_header_height()),
                 Constraint::Length(1),
                 Constraint::Min(0),
+                Constraint::Length(self.calc_info_bar_height(area.width)),
             ],
         )
         .split(area);
@@ -536,5 +565,6 @@ impl Widget for Tui<'_> {
             list_area.height = list_height;
         }
         self.render_list(list_area, buf);
+        self.render_info_bar(layout[3], buf);
     }
 }