Recipes drag and drop feature

vscode/webviews/App.story.tsx

@@ -55,4 +55,6 @@ const dummyVSCodeAPI: VSCodeWrapper = {
         return () => {}
     },
     postMessage: () => {},
+    getState: () => ({}),
+    setState: () => {},
 }

vscode/webviews/Login.story.tsx

@@ -15,6 +15,8 @@ const meta: ComponentMeta<typeof Login> = {
 const vscodeAPI: VSCodeWrapper = {
     postMessage: () => {},
     onMessage: () => () => {},
+    getState: () => ({}),
+    setState: () => {},
 }
 
 const validAuthStatus: AuthStatus = {

vscode/webviews/Recipes.module.css

@@ -11,6 +11,11 @@
     padding-bottom: 0.5rem;
 }
 
+.recipe-button-drag {
+    border-top: 2px solid var(--vscode-activityBar-activeBorder
+    );
+}
+
 .recipes-header {
     display: flex;
     justify-content: space-between;

vscode/webviews/Recipes.tsx

@@ -1,3 +1,5 @@
+import { useState } from 'react'
+
 import { VSCodeButton } from '@vscode/webview-ui-toolkit/react'
 
 import { RecipeID } from '@sourcegraph/cody-shared/src/chat/recipes/recipe'
@@ -6,6 +8,12 @@ import { VSCodeWrapper } from './utils/VSCodeApi'
 
 import styles from './Recipes.module.css'
 
+type RecipeListType = Record<string, string>
+
+interface State {
+    reorderedRecipes: RecipeListType
+}
+
 export const recipesList = {
     'explain-code-detailed': 'Explain selected code (detailed)',
     'explain-code-high-level': 'Explain selected code (high level)',
@@ -25,6 +33,10 @@ export const Recipes: React.FunctionComponent<{
     vscodeAPI: VSCodeWrapper
     myPrompts: string[] | null
 }> = ({ vscodeAPI, myPrompts }) => {
+    const initalState = vscodeAPI.getState() as State | undefined
+    const reorderedRecipeList: RecipeListType = initalState?.reorderedRecipes ?? recipesList
+    const [recipes, setRecipes] = useState<RecipeListType>(reorderedRecipeList)
+    const [draggedIndex, setDraggedIndex] = useState<number | null>(null)
     const onRecipeClick = (recipeID: RecipeID): void => {
         vscodeAPI.postMessage({ command: 'executeRecipe', recipe: recipeID })
     }
@@ -33,6 +45,34 @@ export const Recipes: React.FunctionComponent<{
     }
     const myPromptsEnabled = myPrompts !== null
 
+    const handleDragStart = (event: React.DragEvent<HTMLElement>, index: number): void => {
+        setDraggedIndex(index)
+    }
+
+    const handleDragOver = (event: React.DragEvent<HTMLElement>, index: number): void => {
+        event.preventDefault()
+
+        if (draggedIndex !== null && draggedIndex !== index) {
+            const newRecipes = Object.entries(recipes)
+            const [removedRecipe] = newRecipes.splice(draggedIndex, 1)
+            newRecipes.splice(index, 0, removedRecipe)
+
+            const reorderedRecipes: RecipeListType = {} as RecipeListType
+
+            for (const recipe of newRecipes) {
+                reorderedRecipes[recipe[0]] = recipe[1]
+            }
+
+            setRecipes(reorderedRecipes)
+            vscodeAPI.setState({ reorderedRecipes })
+            setDraggedIndex(index)
+        }
+    }
+
+    const handleDragEnd = (): void => {
+        setDraggedIndex(null)
+    }
+
     return (
         <div className="inner-container">
             <div className="non-transcript-container">
@@ -99,12 +139,18 @@ export const Recipes: React.FunctionComponent<{
                             </div>
                         </>
                     )}
-                    {Object.entries(recipesList).map(([key, value]) => (
+                    {Object.entries(recipes).map(([key, value], index) => (
                         <VSCodeButton
                             key={key}
-                            className={styles.recipeButton}
+                            className={`${styles.recipeButton} ${
+                                draggedIndex === index ? styles.recipeButtonDrag : ''
+                            }`}
                             type="button"
                             onClick={() => onRecipeClick(key as RecipeID)}
+                            draggable={true}
+                            onDragStart={e => handleDragStart(e, index)}
+                            onDragOver={e => handleDragOver(e, index)}
+                            onDragEnd={handleDragEnd}
                         >
                             {value}
                         </VSCodeButton>

vscode/webviews/utils/VSCodeApi.ts

@@ -11,6 +11,8 @@ interface VSCodeApi {
 export interface VSCodeWrapper {
     postMessage(message: WebviewMessage): void
     onMessage(callback: (message: ExtensionMessage) => void): () => void
+    getState(): unknown
+    setState(newState: unknown): void
 }
 
 let api: VSCodeWrapper
@@ -27,6 +29,8 @@ export function getVSCodeAPI(): VSCodeWrapper {
                 window.addEventListener('message', listener)
                 return () => window.removeEventListener('message', listener)
             },
+            setState: newState => vsCodeApi.setState(newState),
+            getState: () => vsCodeApi.getState(),
         }
     }
     return api