feat(stepfunctions): previewStateMachine opens in Workflow Studio #6511

## Problem
The preview state machine command (used in an icon button and a code
lens button) consists of a read-only graph component which provides a
simple graph representation of an ASL definition. It does not include
any other information such as state types or resources.

## Solution
Replace the graph visualization in the previewStateMachine command with
the Workflow Studio graph and editor. Workflow Studio is editable and
includes icons and descriptions representing the state types and
resources. Users will now be able to edit the state definition in the
graph visualization directly.

packages/core/package.nls.json

@@ -212,7 +212,6 @@
     "AWS.command.s3.uploadFileToParent": "Upload to Parent...",
     "AWS.command.stepFunctions.createStateMachineFromTemplate": "Create a new Step Functions state machine",
     "AWS.command.stepFunctions.publishStateMachine": "Publish state machine to Step Functions",
-    "AWS.command.stepFunctions.previewStateMachine": "Render state machine graph",
     "AWS.command.stepFunctions.openWithWorkflowStudio": "Open with Workflow Studio",
     "AWS.command.cdk.previewStateMachine": "Render state machine graph from CDK application",
     "AWS.command.copyLogResource": "Copy Log Stream or Group",

packages/core/src/stepFunctions/activation.ts

@@ -13,7 +13,6 @@ import * as vscode from 'vscode'
 import { AwsContext } from '../shared/awsContext'
 import { createStateMachineFromTemplate } from './commands/createStateMachineFromTemplate'
 import { publishStateMachine } from './commands/publishStateMachine'
-import { AslVisualizationManager } from './commands/visualizeStateMachine/aslVisualizationManager'
 import { Commands } from '../shared/vscode/commands2'
 
 import { ASL_FORMATS, YAML_ASL, JSON_ASL } from './constants/aslFormats'
@@ -23,6 +22,7 @@ import { ToolkitError } from '../shared/errors'
 import { telemetry } from '../shared/telemetry/telemetry'
 import { PerfLog } from '../shared/logger/perfLogger'
 import { ASLLanguageClient } from './asl/client'
+import { WorkflowStudioEditorProvider } from './workflowStudio/workflowStudioEditorProvider'
 
 /**
  * Activate Step Functions related functionality for the extension.
@@ -54,28 +54,22 @@ export async function activate(
     }
 }
 
-/*
- * TODO: Determine behaviour when command is run against bad input, or
- * non-json files. Determine if we want to limit the command to only a
- * specifc subset of file types ( .json only, custom .states extension, etc...)
- * Ensure tests are written for this use case as well.
- */
 export const previewStateMachineCommand = Commands.declare(
     'aws.previewStateMachine',
-    (manager: AslVisualizationManager) => async (arg?: vscode.TextEditor | vscode.Uri) => {
-        try {
+    () => async (arg?: vscode.TextEditor | vscode.Uri) => {
+        await telemetry.run('stepfunctions_previewstatemachine', async () => {
             arg ??= vscode.window.activeTextEditor
             const input = arg instanceof vscode.Uri ? arg : arg?.document
 
             if (!input) {
                 throw new ToolkitError('No active text editor or document found')
             }
 
-            return await manager.visualizeStateMachine(input)
-        } finally {
-            // TODO: Consider making the metric reflect the success/failure of the above call
-            telemetry.stepfunctions_previewstatemachine.emit()
-        }
+            await vscode.commands.executeCommand('vscode.openWith', input, WorkflowStudioEditorProvider.viewType, {
+                preserveFocus: true,
+                viewColumn: vscode.ViewColumn.Beside,
+            })
+        })
     }
 )
 
@@ -84,11 +78,10 @@ async function registerStepFunctionCommands(
     awsContext: AwsContext,
     outputChannel: vscode.OutputChannel
 ): Promise<void> {
-    const visualizationManager = new AslVisualizationManager(extensionContext)
     const cdkVisualizationManager = new AslVisualizationCDKManager(extensionContext)
 
     extensionContext.subscriptions.push(
-        previewStateMachineCommand.register(visualizationManager),
+        previewStateMachineCommand.register(),
         renderCdkStateMachineGraph.register(cdkVisualizationManager),
         Commands.register('aws.stepfunctions.createStateMachineFromTemplate', async () => {
             try {
@@ -144,15 +137,8 @@ function initializeCodeLens(context: vscode.ExtensionContext) {
         public async provideCodeLenses(document: vscode.TextDocument): Promise<vscode.CodeLens[]> {
             const topOfDocument = new vscode.Range(0, 0, 0, 0)
 
-            const openCustomEditorCommand: vscode.Command = {
-                command: 'aws.stepfunctions.switchToWorkflowStudio',
+            const openCustomEditor = previewStateMachineCommand.build(document.uri).asCodeLens(topOfDocument, {
                 title: localize('AWS.command.stepFunctions.openWithWorkflowStudio', 'Open with Workflow Studio'),
-                arguments: [document.uri],
-            }
-            const openCustomEditor = new vscode.CodeLens(topOfDocument, openCustomEditorCommand)
-
-            const renderCodeLens = previewStateMachineCommand.build().asCodeLens(topOfDocument, {
-                title: localize('AWS.stepFunctions.render', 'Render graph'),
             })
 
             if (ASL_FORMATS.includes(document.languageId)) {
@@ -162,9 +148,9 @@ function initializeCodeLens(context: vscode.ExtensionContext) {
                 }
                 const publishCodeLens = new vscode.CodeLens(topOfDocument, publishCommand)
 
-                return [openCustomEditor, publishCodeLens, renderCodeLens]
+                return [publishCodeLens, openCustomEditor]
             } else {
-                return [openCustomEditor, renderCodeLens]
+                return [openCustomEditor]
             }
         }
     }