repl: Iterate on design of REPL sessions view (zed-industries#14987)

This PR iterates on the design of the REPL sessions view.

We now use the same component for both available kernels and running
ones to provide some consistency between the two modes:

<img width="1208" alt="Screenshot 2024-07-22 at 6 49 08 PM"
src="https://github.com/user-attachments/assets/8b5c3600-e438-49fa-8484-cefabf4b44f1">

<img width="1208" alt="Screenshot 2024-07-22 at 6 49 14 PM"
src="https://github.com/user-attachments/assets/5125e9b3-6465-4d1e-9036-e6ca270dedcb">

Release Notes:

- N/A

crates/repl/src/components.rs

@@ -0,0 +1,3 @@
+mod kernel_list_item;
+
+pub use kernel_list_item::*;

crates/repl/src/components/kernel_list_item.rs

@@ -0,0 +1,60 @@
+use gpui::AnyElement;
+use ui::{prelude::*, Indicator, ListItem};
+
+use crate::KernelSpecification;
+
+#[derive(IntoElement)]
+pub struct KernelListItem {
+    kernel_specification: KernelSpecification,
+    status_color: Color,
+    buttons: Vec<AnyElement>,
+    children: Vec<AnyElement>,
+}
+
+impl KernelListItem {
+    pub fn new(kernel_specification: KernelSpecification) -> Self {
+        Self {
+            kernel_specification,
+            status_color: Color::Disabled,
+            buttons: Vec::new(),
+            children: Vec::new(),
+        }
+    }
+
+    pub fn status_color(mut self, color: Color) -> Self {
+        self.status_color = color;
+        self
+    }
+
+    pub fn button(mut self, button: impl IntoElement) -> Self {
+        self.buttons.push(button.into_any_element());
+        self
+    }
+
+    pub fn buttons(mut self, buttons: impl IntoIterator<Item = impl IntoElement>) -> Self {
+        self.buttons
+            .extend(buttons.into_iter().map(|button| button.into_any_element()));
+        self
+    }
+}
+
+impl ParentElement for KernelListItem {
+    fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {
+        self.children.extend(elements);
+    }
+}
+
+impl RenderOnce for KernelListItem {
+    fn render(self, _cx: &mut WindowContext) -> impl IntoElement {
+        ListItem::new(SharedString::from(self.kernel_specification.name.clone()))
+            .selectable(false)
+            .start_slot(
+                h_flex()
+                    .size_3()
+                    .justify_center()
+                    .child(Indicator::dot().color(self.status_color)),
+            )
+            .children(self.children)
+            .end_slot(h_flex().gap_2().children(self.buttons))
+    }
+}

crates/repl/src/kernels.rs

@@ -18,7 +18,6 @@ use std::{
     path::PathBuf,
     sync::Arc,
 };
-use ui::{Color, Indicator};
 
 #[derive(Debug, Clone)]
 pub struct KernelSpecification {
@@ -72,15 +71,6 @@ async fn peek_ports(ip: IpAddr) -> Result<[u16; 5]> {
     Ok(ports)
 }
 
-#[derive(Debug)]
-pub enum Kernel {
-    RunningKernel(RunningKernel),
-    StartingKernel(Shared<Task<()>>),
-    ErroredLaunch(String),
-    ShuttingDown,
-    Shutdown,
-}
-
 #[derive(Debug, Clone)]
 pub enum KernelStatus {
     Idle,
@@ -90,6 +80,7 @@ pub enum KernelStatus {
     ShuttingDown,
     Shutdown,
 }
+
 impl KernelStatus {
     pub fn is_connected(&self) -> bool {
         match self {
@@ -127,20 +118,16 @@ impl From<&Kernel> for KernelStatus {
     }
 }
 
-impl Kernel {
-    pub fn dot(&self) -> Indicator {
-        match self {
-            Kernel::RunningKernel(kernel) => match kernel.execution_state {
-                ExecutionState::Idle => Indicator::dot().color(Color::Success),
-                ExecutionState::Busy => Indicator::dot().color(Color::Modified),
-            },
-            Kernel::StartingKernel(_) => Indicator::dot().color(Color::Modified),
-            Kernel::ErroredLaunch(_) => Indicator::dot().color(Color::Error),
-            Kernel::ShuttingDown => Indicator::dot().color(Color::Modified),
-            Kernel::Shutdown => Indicator::dot().color(Color::Disabled),
-        }
-    }
+#[derive(Debug)]
+pub enum Kernel {
+    RunningKernel(RunningKernel),
+    StartingKernel(Shared<Task<()>>),
+    ErroredLaunch(String),
+    ShuttingDown,
+    Shutdown,
+}
 
+impl Kernel {
     pub fn status(&self) -> KernelStatus {
         self.into()
     }
@@ -162,6 +149,16 @@ impl Kernel {
             _ => {}
         }
     }
+
+    pub fn is_shutting_down(&self) -> bool {
+        match self {
+            Kernel::ShuttingDown => true,
+            Kernel::RunningKernel(_)
+            | Kernel::StartingKernel(_)
+            | Kernel::ErroredLaunch(_)
+            | Kernel::Shutdown => false,
+        }
+    }
 }
 
 pub struct RunningKernel {

crates/repl/src/repl.rs

@@ -1,9 +1,4 @@
-use async_dispatcher::{set_dispatcher, Dispatcher, Runnable};
-use gpui::{AppContext, PlatformDispatcher};
-use project::Fs;
-use settings::Settings as _;
-use std::{sync::Arc, time::Duration};
-
+mod components;
 mod jupyter_settings;
 mod kernels;
 mod outputs;
@@ -13,14 +8,22 @@ mod repl_store;
 mod session;
 mod stdio;
 
-pub use jupyter_settings::JupyterSettings;
-pub use kernels::{Kernel, KernelSpecification, KernelStatus};
-pub use repl_editor::*;
-pub use repl_sessions_ui::{ClearOutputs, Interrupt, ReplSessionsPage, Run, Sessions, Shutdown};
+use std::{sync::Arc, time::Duration};
+
+use async_dispatcher::{set_dispatcher, Dispatcher, Runnable};
+use gpui::{AppContext, PlatformDispatcher};
+use project::Fs;
 pub use runtimelib::ExecutionState;
-pub use session::Session;
+use settings::Settings as _;
 
+pub use crate::jupyter_settings::JupyterSettings;
+pub use crate::kernels::{Kernel, KernelSpecification, KernelStatus};
+pub use crate::repl_editor::*;
+pub use crate::repl_sessions_ui::{
+    ClearOutputs, Interrupt, ReplSessionsPage, Run, Sessions, Shutdown,
+};
 use crate::repl_store::ReplStore;
+pub use crate::session::Session;
 
 fn zed_dispatcher(cx: &mut AppContext) -> impl Dispatcher {
     struct ZedDispatcher {

crates/repl/src/repl_sessions_ui.rs

@@ -1,13 +1,15 @@
 use editor::Editor;
 use gpui::{
-    actions, prelude::*, AppContext, EventEmitter, FocusHandle, FocusableView, Subscription, View,
+    actions, prelude::*, AnyElement, AppContext, EventEmitter, FocusHandle, FocusableView,
+    Subscription, View,
 };
 use ui::{prelude::*, ButtonLike, ElevationIndex, KeyBinding};
 use util::ResultExt as _;
 use workspace::item::ItemEvent;
 use workspace::WorkspaceId;
 use workspace::{item::Item, Workspace};
 
+use crate::components::KernelListItem;
 use crate::jupyter_settings::JupyterSettings;
 use crate::repl_store::ReplStore;
 
@@ -187,15 +189,10 @@ impl Render for ReplSessionsPage {
         // install kernels. It can be assumed they don't have a running kernel if we have no
         // specifications.
         if kernel_specifications.is_empty() {
-            return v_flex()
-                .p_4()
-                .size_full()
-                .gap_2()
-                .child(Label::new("No Jupyter Kernels Available").size(LabelSize::Large))
-                .child(
-                    Label::new("To start interactively running code in your editor, you need to install and configure Jupyter kernels.")
-                        .size(LabelSize::Default),
-                )
+            let instructions = "To start interactively running code in your editor, you need to install and configure Jupyter kernels.";
+
+            return ReplSessionsContainer::new("No Jupyter Kernels Available")
+                .child(Label::new(instructions))
                 .child(
                     h_flex().w_full().p_4().justify_center().gap_2().child(
                         ButtonLike::new("install-kernels")
@@ -209,48 +206,62 @@ impl Render for ReplSessionsPage {
                                 )
                             }),
                     ),
-                )
-                .into_any_element();
+                );
         }
 
         // When there are no sessions, show the command to run code in an editor
         if sessions.is_empty() {
-            return v_flex()
-                .p_4()
-                .size_full()
-                .gap_2()
-                .child(Label::new("No Jupyter Kernel Sessions").size(LabelSize::Large))
+            let instructions = "To run code in a Jupyter kernel, select some code and use the 'repl::Run' command.";
+
+            return ReplSessionsContainer::new("No Jupyter Kernel Sessions")
                 .child(
-                    v_flex().child(
-                        Label::new("To run code in a Jupyter kernel, select some code and use the 'repl::Run' command.")
-                            .size(LabelSize::Default)
-                    )
-                    .children(
-                            KeyBinding::for_action(&Run, cx)
-                            .map(|binding|
-                                binding.into_any_element()
-                            )
-                    )
+                    v_flex()
+                        .child(Label::new(instructions))
+                        .children(KeyBinding::for_action(&Run, cx)),
                 )
                 .child(Label::new("Kernels available").size(LabelSize::Large))
-                .children(
-                    kernel_specifications.into_iter().map(|spec| {
-                        h_flex().gap_2().child(Label::new(spec.name.clone()))
-                            .child(Label::new(spec.kernelspec.language.clone()).color(Color::Muted))
-                    })
-                )
+                .children(kernel_specifications.into_iter().map(|spec| {
+                    KernelListItem::new(spec.clone()).child(
+                        h_flex()
+                            .gap_2()
+                            .child(Label::new(spec.name))
+                            .child(Label::new(spec.kernelspec.language).color(Color::Muted)),
+                    )
+                }));
+        }
 
-                .into_any_element();
+        ReplSessionsContainer::new("Jupyter Kernel Sessions").children(sessions)
+    }
+}
+
+#[derive(IntoElement)]
+struct ReplSessionsContainer {
+    title: SharedString,
+    children: Vec<AnyElement>,
+}
+
+impl ReplSessionsContainer {
+    pub fn new(title: impl Into<SharedString>) -> Self {
+        Self {
+            title: title.into(),
+            children: Vec::new(),
         }
+    }
+}
 
+impl ParentElement for ReplSessionsContainer {
+    fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {
+        self.children.extend(elements)
+    }
+}
+
+impl RenderOnce for ReplSessionsContainer {
+    fn render(self, _cx: &mut WindowContext) -> impl IntoElement {
         v_flex()
             .p_4()
-            .child(Label::new("Jupyter Kernel Sessions").size(LabelSize::Large))
-            .children(
-                sessions
-                    .into_iter()
-                    .map(|session| session.clone().into_any_element()),
-            )
-            .into_any_element()
+            .gap_2()
+            .size_full()
+            .child(Label::new(self.title).size(LabelSize::Large))
+            .children(self.children)
     }
 }