Show tooltip in task spawn modal (#10744)

Tooltip shows original task template's label, if it differs from the one
displayed in the modal. Also, a resolved command with args will be shown
in the tooltip if different from the modal entry text.

<img width="578" alt="Screenshot 2024-04-19 at 00 40 28"
src="https://github.com/zed-industries/zed/assets/2690773/c89369d6-8ffc-4464-ab3b-ea5e8fb7625a">
<img width="761" alt="Screenshot 2024-04-19 at 00 40 32"
src="https://github.com/zed-industries/zed/assets/2690773/b02f1518-976a-4a9b-ba7c-f88c6e056217">
<img width="738" alt="Screenshot 2024-04-19 at 00 40 56"
src="https://github.com/zed-industries/zed/assets/2690773/be502537-f4bd-4ae0-a5e7-78e37fe8fb00">
<img width="785" alt="Screenshot 2024-04-19 at 00 41 01"
src="https://github.com/zed-industries/zed/assets/2690773/9bedcd21-8729-44c8-9a17-46a5a01c7f26">


Release Notes:

- Added tooltips into task spawn modal

Cargo.lock

@@ -9736,7 +9736,6 @@ dependencies = [
  "file_icons",
  "fuzzy",
  "gpui",
- "itertools 0.11.0",
  "language",
  "picker",
  "project",

crates/task/src/lib.rs

@@ -75,6 +75,26 @@ impl ResolvedTask {
     pub fn substituted_variables(&self) -> &HashSet<VariableName> {
         &self.substituted_variables
     }
+
+    /// If the resolution produced a task with the command, returns a string, combined from its command and arguments.
+    pub fn resolved_command(&self) -> Option<String> {
+        self.resolved.as_ref().map(|resolved| {
+            let mut command = resolved.command.clone();
+            for arg in &resolved.args {
+                command.push(' ');
+                command.push_str(arg);
+            }
+            command
+        })
+    }
+
+    /// A human-readable label to display in the UI.
+    pub fn display_label(&self) -> &str {
+        self.resolved
+            .as_ref()
+            .map(|resolved| resolved.label.as_str())
+            .unwrap_or_else(|| self.resolved_label.as_str())
+    }
 }
 
 /// Variables, available for use in [`TaskContext`] when a Zed's [`TaskTemplate`] gets resolved into a [`ResolvedTask`].

crates/tasks_ui/Cargo.toml

@@ -25,7 +25,6 @@ util.workspace = true
 terminal.workspace = true
 workspace.workspace = true
 language.workspace = true
-itertools.workspace = true
 
 
 [dev-dependencies]

crates/tasks_ui/src/modal.rs

@@ -233,11 +233,7 @@ impl PickerDelegate for TasksModalDelegate {
                         .map(|(index, (_, candidate))| StringMatchCandidate {
                             id: index,
                             char_bag: candidate.resolved_label.chars().collect(),
-                            string: candidate
-                                .resolved
-                                .as_ref()
-                                .map(|resolved| resolved.label.clone())
-                                .unwrap_or_else(|| candidate.resolved_label.clone()),
+                            string: candidate.display_label().to_owned(),
                         })
                         .collect::<Vec<_>>()
                 })
@@ -306,7 +302,28 @@ impl PickerDelegate for TasksModalDelegate {
     ) -> Option<Self::ListItem> {
         let candidates = self.candidates.as_ref()?;
         let hit = &self.matches[ix];
-        let (source_kind, _) = &candidates.get(hit.candidate_id)?;
+        let (source_kind, resolved_task) = &candidates.get(hit.candidate_id)?;
+        let template = resolved_task.original_task();
+        let display_label = resolved_task.display_label();
+
+        let mut tooltip_label_text = if display_label != &template.label {
+            template.label.clone()
+        } else {
+            String::new()
+        };
+        if let Some(resolved_command) = resolved_task.resolved_command() {
+            if display_label != resolved_command {
+                if !tooltip_label_text.trim().is_empty() {
+                    tooltip_label_text.push('\n');
+                }
+                tooltip_label_text.push_str(&resolved_command);
+            }
+        }
+        let tooltip_label = if tooltip_label_text.trim().is_empty() {
+            None
+        } else {
+            Some(Tooltip::text(tooltip_label_text, cx))
+        };
 
         let highlighted_location = HighlightedText {
             text: hit.string.clone(),
@@ -321,10 +338,14 @@ impl PickerDelegate for TasksModalDelegate {
                 .get_type_icon(&name.to_lowercase())
                 .map(|icon_path| Icon::from_path(icon_path)),
         };
+
         Some(
             ListItem::new(SharedString::from(format!("tasks-modal-{ix}")))
                 .inset(true)
                 .spacing(ListItemSpacing::Sparse)
+                .when_some(tooltip_label, |list_item, item_label| {
+                    list_item.tooltip(move |_| item_label.clone())
+                })
                 .map(|item| {
                     let item = if matches!(source_kind, TaskSourceKind::UserInput)
                         || Some(ix) <= self.last_used_candidate_index
@@ -368,18 +389,10 @@ impl PickerDelegate for TasksModalDelegate {
     }
 
     fn selected_as_query(&self) -> Option<String> {
-        use itertools::intersperse;
         let task_index = self.matches.get(self.selected_index())?.candidate_id;
         let tasks = self.candidates.as_ref()?;
         let (_, task) = tasks.get(task_index)?;
-        task.resolved.as_ref().map(|spawn_in_terminal| {
-            let mut command = spawn_in_terminal.command.clone();
-            if !spawn_in_terminal.args.is_empty() {
-                command.push(' ');
-                command.extend(intersperse(spawn_in_terminal.args.clone(), " ".to_string()));
-            }
-            command
-        })
+        task.resolved_command()
     }
 
     fn confirm_input(&mut self, omit_history_entry: bool, cx: &mut ViewContext<Picker<Self>>) {