From b151241d8491db93e32db84315e9dc575bb8a2ec Mon Sep 17 00:00:00 2001
From: Marshall Bowers <elliott.codes@gmail.com>
Date: Thu, 15 Aug 2024 18:28:17 -0400
Subject: [PATCH] assistant: Improve the empty state for the prompt library
 (#16320)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This PR improves the empty state of the prompt library.

The right-hand side of the library is now dedicated to an empty state
that guides the user to create their first prompt.

Additionally, the message in the picker now reads "No prompts." when
there are no prompts.

#### No prompts

<img width="1136" alt="Screenshot 2024-08-15 at 6 20 26 PM"
src="https://github.com/user-attachments/assets/f9af2b5d-c4d3-4e2c-9ba2-f17e89f19bb7">

#### No prompts that match the search

<img width="1136" alt="Screenshot 2024-08-15 at 5 55 07 PM"
src="https://github.com/user-attachments/assets/2cd4ff9b-958d-4bd0-90d3-dca62b1a91a0">

Release Notes:

- N/A
---
 crates/assistant/src/prompt_library.rs | 69 ++++++++++++++++++++++++--
 1 file changed, 65 insertions(+), 4 deletions(-)

diff --git a/crates/assistant/src/prompt_library.rs b/crates/assistant/src/prompt_library.rs
index 7cde30a805ddaf300d0ab3ae7904b560cd11f3f6..124420b0cde5aff03a3239ef3d59100a1082f687 100644
--- a/crates/assistant/src/prompt_library.rs
+++ b/crates/assistant/src/prompt_library.rs
@@ -11,8 +11,8 @@ use futures::{
 };
 use fuzzy::StringMatchCandidate;
 use gpui::{
-    actions, point, size, transparent_black, AppContext, BackgroundExecutor, Bounds, EventEmitter,
-    Global, HighlightStyle, PromptLevel, ReadGlobal, Subscription, Task, TextStyle,
+    actions, point, size, transparent_black, Action, AppContext, BackgroundExecutor, Bounds,
+    EventEmitter, Global, HighlightStyle, PromptLevel, ReadGlobal, Subscription, Task, TextStyle,
     TitlebarOptions, UpdateGlobal, View, WindowBounds, WindowHandle, WindowOptions,
 };
 use heed::{
@@ -38,7 +38,7 @@ use std::{
 use text::LineEnding;
 use theme::ThemeSettings;
 use ui::{
-    div, prelude::*, IconButtonShape, ListItem, ListItemSpacing, ParentElement, Render,
+    div, prelude::*, IconButtonShape, KeyBinding, ListItem, ListItemSpacing, ParentElement, Render,
     SharedString, Styled, Tooltip, ViewContext, VisualContext,
 };
 use util::{ResultExt, TryFutureExt};
@@ -155,6 +155,14 @@ impl PickerDelegate for PromptPickerDelegate {
         self.matches.len()
     }
 
+    fn no_matches_text(&self, _cx: &mut WindowContext) -> SharedString {
+        if self.store.prompt_count() == 0 {
+            "No prompts.".into()
+        } else {
+            "No prompts found matching your search.".into()
+        }
+    }
+
     fn selected_index(&self) -> usize {
         self.selected_index
     }
@@ -1094,7 +1102,55 @@ impl Render for PromptLibrary {
             .font(ui_font)
             .text_color(theme.colors().text)
             .child(self.render_prompt_list(cx))
-            .child(self.render_active_prompt(cx))
+            .map(|el| {
+                if self.store.prompt_count() == 0 {
+                    el.child(
+                        v_flex()
+                            .w_2_3()
+                            .h_full()
+                            .items_center()
+                            .justify_center()
+                            .gap_4()
+                            .bg(cx.theme().colors().editor_background)
+                            .child(
+                                h_flex()
+                                    .gap_2()
+                                    .child(
+                                        Icon::new(IconName::Book)
+                                            .size(IconSize::Medium)
+                                            .color(Color::Muted),
+                                    )
+                                    .child(
+                                        Label::new("No prompts yet")
+                                            .size(LabelSize::Large)
+                                            .color(Color::Muted),
+                                    ),
+                            )
+                            .child(
+                                h_flex()
+                                    .child(h_flex())
+                                    .child(
+                                        v_flex()
+                                            .gap_1()
+                                            .child(Label::new("Create your first prompt:"))
+                                            .child(
+                                                Button::new("create-prompt", "New Prompt")
+                                                    .full_width()
+                                                    .key_binding(KeyBinding::for_action(
+                                                        &NewPrompt, cx,
+                                                    ))
+                                                    .on_click(|_, cx| {
+                                                        cx.dispatch_action(NewPrompt.boxed_clone())
+                                                    }),
+                                            ),
+                                    )
+                                    .child(h_flex()),
+                            ),
+                    )
+                } else {
+                    el.child(self.render_active_prompt(cx))
+                }
+            })
     }
 }
 
@@ -1342,6 +1398,11 @@ impl PromptStore {
         })
     }
 
+    /// Returns the number of prompts in the store.
+    fn prompt_count(&self) -> usize {
+        self.metadata_cache.read().metadata.len()
+    }
+
     fn metadata(&self, id: PromptId) -> Option<PromptMetadata> {
         self.metadata_cache.read().metadata_by_id.get(&id).cloned()
     }