visualize pending load on status file list (closes #160)

Author: Stephan Dilly

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
-- pending load of a diff is visualized better ([#160](https://github.com/extrawurst/gitui/issues/160))
+- pending load of a diff/status is visualized ([#160](https://github.com/extrawurst/gitui/issues/160))
 - entry on [git-scm.com](https://git-scm.com/downloads/guis) in the list of GUI tools [[@Vidar314](https://github.com/Vidar314)] (see [PR](https://github.com/git/git-scm.com/pull/1485))
 - commits can be tagged in revlog [[@cruessler](https://github.com/cruessler)] ([#103](https://github.com/extrawurst/gitui/issues/103))
 

src/components/filetree.rs

@@ -9,7 +9,7 @@ use crate::{
     components::{CommandInfo, Component},
     keys,
     queue::{InternalEvent, NeedsUpdate, Queue},
-    strings::{commands, order},
+    strings::{self, commands, order},
     ui,
     ui::style::SharedTheme,
 };
@@ -23,6 +23,7 @@ use tui::{backend::Backend, layout::Rect, widgets::Text, Frame};
 pub struct FileTreeComponent {
     title: String,
     tree: StatusTree,
+    pending: bool,
     current_hash: u64,
     focused: bool,
     show_selection: bool,
@@ -48,11 +49,13 @@ impl FileTreeComponent {
             queue,
             theme,
             scroll_top: Cell::new(0),
+            pending: true,
         }
     }
 
     ///
     pub fn update(&mut self, list: &[StatusItem]) -> Result<()> {
+        self.pending = false;
         let new_hash = hash(list);
         if self.current_hash != new_hash {
             self.tree.update(list)?;
@@ -217,25 +220,58 @@ impl DrawableComponent for FileTreeComponent {
         f: &mut Frame<B>,
         r: Rect,
     ) -> Result<()> {
-        let selection_offset =
-            self.tree.tree.items().iter().enumerate().fold(
-                0,
-                |acc, (idx, e)| {
-                    let visible = e.info.visible;
-                    let index_above_select =
-                        idx < self.tree.selection.unwrap_or(0);
-
-                    if !visible && index_above_select {
-                        acc + 1
-                    } else {
-                        acc
-                    }
-                },
+        if self.pending {
+            let items = vec![Text::Styled(
+                Cow::from(strings::LOADING_TEXT),
+                self.theme.text(false, false),
+            )];
+
+            ui::draw_list(
+                f,
+                r,
+                self.title.as_str(),
+                items.into_iter(),
+                None,
+                self.focused,
+                &self.theme,
             );
-
-        let items =
-            self.tree.tree.items().iter().enumerate().filter_map(
-                |(idx, e)| {
+        } else {
+            let selection_offset =
+                self.tree.tree.items().iter().enumerate().fold(
+                    0,
+                    |acc, (idx, e)| {
+                        let visible = e.info.visible;
+                        let index_above_select =
+                            idx < self.tree.selection.unwrap_or(0);
+
+                        if !visible && index_above_select {
+                            acc + 1
+                        } else {
+                            acc
+                        }
+                    },
+                );
+
+            let select = self
+                .tree
+                .selection
+                .map(|idx| idx.saturating_sub(selection_offset))
+                .unwrap_or_default();
+            let tree_height = r.height.saturating_sub(2) as usize;
+
+            self.scroll_top.set(ui::calc_scroll_top(
+                self.scroll_top.get(),
+                tree_height,
+                select,
+            ));
+
+            let items = self
+                .tree
+                .tree
+                .items()
+                .iter()
+                .enumerate()
+                .filter_map(|(idx, e)| {
                     Self::item_to_text(
                         e,
                         r.width,
@@ -246,31 +282,19 @@ impl DrawableComponent for FileTreeComponent {
                                 .map_or(false, |e| e == idx),
                         &self.theme,
                     )
-                },
+                })
+                .skip(self.scroll_top.get());
+
+            ui::draw_list(
+                f,
+                r,
+                self.title.as_str(),
+                items,
+                Some(select),
+                self.focused,
+                &self.theme,
             );
-
-        let select = self
-            .tree
-            .selection
-            .map(|idx| idx.saturating_sub(selection_offset))
-            .unwrap_or_default();
-        let tree_height = r.height.saturating_sub(2) as usize;
-
-        self.scroll_top.set(ui::calc_scroll_top(
-            self.scroll_top.get(),
-            tree_height,
-            select,
-        ));
-
-        ui::draw_list(
-            f,
-            r,
-            self.title.as_str(),
-            items.skip(self.scroll_top.get()),
-            Some(select),
-            self.focused,
-            &self.theme,
-        );
+        }
 
         Ok(())
     }