Improve workflow step view (#16329)

* Improve the tab title: give it an icon, and indicate the step index.
* Display the line number ranges that the symbols resolve to.
* Don't open duplicate tabs for the same step

Release Notes:

- N/A

crates/assistant/src/assistant_panel.rs

@@ -2407,7 +2407,7 @@ impl ContextEditor {
         let Some(step) = self
             .context
             .read(cx)
-            .workflow_step_for_range(step_range.clone())
+            .workflow_step_for_range(step_range.clone(), cx)
         else {
             return;
         };
@@ -2630,13 +2630,22 @@ impl ContextEditor {
             .ok()??;
         let context = self.context.read(cx);
         let language_registry = context.language_registry();
-        let step = context.workflow_step_for_range(step_range)?;
-        let view = cx.new_view(|cx| {
-            WorkflowStepView::new(self.context.clone(), step, language_registry, cx)
-        });
+        let step = context.workflow_step_for_range(step_range, cx)?;
+        let context = self.context.clone();
         cx.deref_mut().defer(move |cx| {
             pane.update(cx, |pane, cx| {
-                pane.add_item(Box::new(view), true, true, None, cx);
+                let existing_item = pane
+                    .items_of_type::<WorkflowStepView>()
+                    .find(|item| *item.read(cx).step() == step.downgrade());
+                if let Some(item) = existing_item {
+                    if let Some(index) = pane.index_for_item(&item) {
+                        pane.activate_item(index, true, true, cx);
+                    }
+                } else {
+                    let view = cx
+                        .new_view(|cx| WorkflowStepView::new(context, step, language_registry, cx));
+                    pane.add_item(Box::new(view), true, true, None, cx);
+                }
             });
         });
         None

crates/assistant/src/context.rs

@@ -872,14 +872,20 @@ impl Context {
     pub fn workflow_step_for_range(
         &self,
         range: Range<language::Anchor>,
+        cx: &AppContext,
     ) -> Option<Model<WorkflowStep>> {
-        Some(
-            self.workflow_steps
-                .iter()
-                .find(|step| step.range == range)?
-                .step
-                .clone(),
-        )
+        let buffer = self.buffer.read(cx);
+        let index = self.workflow_step_index_for_range(&range, buffer).ok()?;
+        Some(self.workflow_steps[index].step.clone())
+    }
+
+    pub fn workflow_step_index_for_range(
+        &self,
+        tagged_range: &Range<text::Anchor>,
+        buffer: &text::BufferSnapshot,
+    ) -> Result<usize, usize> {
+        self.workflow_steps
+            .binary_search_by(|probe| probe.range.cmp(&tagged_range, buffer))
     }
 
     pub fn pending_slash_commands(&self) -> &[PendingSlashCommand] {
@@ -1126,9 +1132,8 @@ impl Context {
                         ..buffer.anchor_before(step_end_tag_start_ix);
 
                     // Check if a step with the same range already exists
-                    let existing_step_index = self
-                        .workflow_steps
-                        .binary_search_by(|probe| probe.range.cmp(&tagged_range, &buffer));
+                    let existing_step_index =
+                        self.workflow_step_index_for_range(&tagged_range, &buffer);
 
                     if let Err(ix) = existing_step_index {
                         new_edit_steps.push((

crates/assistant/src/workflow/step_view.rs

@@ -11,10 +11,11 @@ use gpui::{
 };
 use language::{language_settings::SoftWrap, Anchor, Buffer, LanguageRegistry};
 use std::{ops::DerefMut, sync::Arc};
+use text::OffsetRangeExt;
 use theme::ActiveTheme as _;
 use ui::{
-    h_flex, v_flex, ButtonCommon as _, ButtonLike, ButtonStyle, Color, InteractiveElement as _,
-    Label, LabelCommon as _,
+    h_flex, v_flex, ButtonCommon as _, ButtonLike, ButtonStyle, Color, Icon, IconName,
+    InteractiveElement as _, Label, LabelCommon as _,
 };
 use workspace::{
     item::{self, Item},
@@ -145,6 +146,10 @@ impl WorkflowStepView {
         }
     }
 
+    pub fn step(&self) -> &WeakModel<WorkflowStep> {
+        &self.step
+    }
+
     fn render_result(&mut self, cx: &mut ViewContext<Self>) -> Option<AnyElement> {
         let step = self.step.upgrade()?;
         let result = step.read(cx).resolution.as_ref()?;
@@ -155,14 +160,17 @@ impl WorkflowStepView {
                         .child(result.title.clone())
                         .children(result.suggestion_groups.iter().filter_map(
                             |(buffer, suggestion_groups)| {
-                                let path = buffer.read(cx).file().map(|f| f.path());
+                                let buffer = buffer.read(cx);
+                                let path = buffer.file().map(|f| f.path());
+                                let snapshot = buffer.snapshot();
                                 v_flex()
                                     .mb_2()
                                     .border_b_1()
                                     .children(path.map(|path| format!("path: {}", path.display())))
                                     .children(suggestion_groups.iter().map(|group| {
-                                        v_flex().pl_2().children(group.suggestions.iter().map(
-                                            |suggestion| {
+                                        v_flex().pt_2().pl_2().children(
+                                            group.suggestions.iter().map(|suggestion| {
+                                                let range = suggestion.range().to_point(&snapshot);
                                                 v_flex()
                                                     .children(
                                                         suggestion.description().map(|desc| {
@@ -173,8 +181,13 @@ impl WorkflowStepView {
                                                     .children(suggestion.symbol_path().map(
                                                         |path| format!("symbol path: {}", path.0),
                                                     ))
-                                            },
-                                        ))
+                                                    .child(format!(
+                                                        "lines: {} - {}",
+                                                        range.start.row + 1,
+                                                        range.end.row + 1
+                                                    ))
+                                            }),
+                                        )
                                     }))
                                     .into()
                             },
@@ -247,8 +260,19 @@ impl FocusableView for WorkflowStepView {
 impl Item for WorkflowStepView {
     type Event = EditorEvent;
 
-    fn tab_content_text(&self, _cx: &WindowContext) -> Option<SharedString> {
-        Some("workflow step".into())
+    fn tab_content_text(&self, cx: &WindowContext) -> Option<SharedString> {
+        let step = self.step.upgrade()?.read(cx);
+        let context = step.context.upgrade()?.read(cx);
+        let buffer = context.buffer().read(cx);
+        let index = context
+            .workflow_step_index_for_range(&step.context_buffer_range, buffer)
+            .ok()?
+            + 1;
+        Some(format!("Step {index}").into())
+    }
+
+    fn tab_icon(&self, _cx: &WindowContext) -> Option<ui::Icon> {
+        Some(Icon::new(IconName::Pencil))
     }
 
     fn to_item_events(event: &Self::Event, mut f: impl FnMut(item::ItemEvent)) {