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Add Ruby Copilot chat agent with domain driven design command (#2366)
* Bump minimum VS Code engine to 1.92 * Add chat agent with domain driven design command * Apply PR feedback
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,230 @@ | ||
| import * as vscode from "vscode"; | ||
|
|
||
| import { Command } from "./common"; | ||
| import { Workspace } from "./workspace"; | ||
|
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| const CHAT_AGENT_ID = "rubyLsp.chatAgent"; | ||
| const DESIGN_PROMPT = ` | ||
| You are a domain driven design and Ruby on Rails expert. | ||
| The user will provide you with details about their Rails application. | ||
| The user will ask you to help model a single specific concept. | ||
| Analyze the provided concept carefully and think step by step. Consider the following aspects: | ||
| 1. The core purpose of the concept | ||
| 2. Its relationships with other potential entities in the system | ||
| 3. The attributes that would best represent this concept in a database | ||
| Based on your analysis, suggest an appropriate model name and attributes to effectively model the concept. | ||
| Follow these guidelines: | ||
| 1. Choose a clear, singular noun for the model name that accurately represents the concept | ||
| 2. Select attributes that capture the essential characteristics of the concept | ||
| 3. Use appropriate data types for each attribute (e.g. string, integer, datetime, boolean) | ||
| 4. Consider adding foreign keys for relationships with other models, if applicable | ||
| After determining the model structure, generate the Rails commands to create the model and any associated resources. | ||
| Include all relevant \`generate\` commands in a single Markdown shell code block at the end of your response. | ||
| The \`generate\` commands should ONLY include the type of generator and arguments, not the \`rails generate\` part | ||
| (e.g.: \`model User name:string\` but not \`rails generate model User name:string\`). | ||
| NEVER include commands to migrate the database as part of the code block. | ||
| NEVER include redundant commands (e.g. including the migration and model generation commands for the same model). | ||
| `.trim(); | ||
|
|
||
| export class ChatAgent implements vscode.Disposable { | ||
| private readonly agent: vscode.ChatParticipant; | ||
| private readonly showWorkspacePick: () => Promise<Workspace | undefined>; | ||
|
|
||
| constructor( | ||
| context: vscode.ExtensionContext, | ||
| showWorkspacePick: () => Promise<Workspace | undefined>, | ||
| ) { | ||
| this.agent = vscode.chat.createChatParticipant( | ||
| CHAT_AGENT_ID, | ||
| this.handler.bind(this), | ||
| ); | ||
| this.agent.iconPath = vscode.Uri.joinPath(context.extensionUri, "icon.png"); | ||
| this.showWorkspacePick = showWorkspacePick; | ||
| } | ||
|
|
||
| dispose() { | ||
| this.agent.dispose(); | ||
| } | ||
|
|
||
| // Handle a new chat message or command | ||
| private async handler( | ||
| request: vscode.ChatRequest, | ||
| context: vscode.ChatContext, | ||
| stream: vscode.ChatResponseStream, | ||
| token: vscode.CancellationToken, | ||
| ) { | ||
| if (this.withinConversation("design", request, context)) { | ||
| return this.runDesignCommand(request, context, stream, token); | ||
| } | ||
|
|
||
| stream.markdown( | ||
| "Please indicate which command you would like to use for our chat.", | ||
| ); | ||
| return { metadata: { command: "" } }; | ||
| } | ||
|
|
||
| // Logic for the domain driven design command | ||
| private async runDesignCommand( | ||
| request: vscode.ChatRequest, | ||
| context: vscode.ChatContext, | ||
| stream: vscode.ChatResponseStream, | ||
| token: vscode.CancellationToken, | ||
| ) { | ||
| const previousInteractions = this.previousInteractions(context); | ||
| const messages = [ | ||
| vscode.LanguageModelChatMessage.User(`User prompt: ${request.prompt}`), | ||
| vscode.LanguageModelChatMessage.User(DESIGN_PROMPT), | ||
| vscode.LanguageModelChatMessage.User( | ||
| `Previous interactions with the user: ${previousInteractions}`, | ||
| ), | ||
| ]; | ||
| const workspace = await this.showWorkspacePick(); | ||
|
|
||
| // On the first interaction with the design command, we gather the application's schema and include it as part of | ||
| // the prompt | ||
| if (request.command && workspace) { | ||
| const schema = await this.schema(workspace); | ||
|
|
||
| if (schema) { | ||
| messages.push( | ||
| vscode.LanguageModelChatMessage.User( | ||
| `Existing application schema: ${schema}`, | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| try { | ||
| // Select the LLM model | ||
| const [model] = await vscode.lm.selectChatModels({ | ||
| vendor: "copilot", | ||
| family: "gpt-4o", | ||
| }); | ||
|
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||
| stream.progress("Designing the models for the requested concept..."); | ||
| const chatResponse = await model.sendRequest(messages, {}, token); | ||
|
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| let response = ""; | ||
| for await (const fragment of chatResponse.text) { | ||
| // Maybe show the buttons here and display multiple shell blocks? | ||
| stream.markdown(fragment); | ||
| response += fragment; | ||
| } | ||
|
|
||
| const match = /(?<=```shell)[^.$]*(?=```)/.exec(response); | ||
|
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| if (workspace && match && match[0]) { | ||
| // The shell code block includes all of the `rails generate` commands. We need to strip out the `rails generate` | ||
| // from all of them since our commands only accept from the generator forward | ||
| const commandList = match[0] | ||
| .trim() | ||
| .split("\n") | ||
| .map((command) => { | ||
| return command.replace(/\s*(bin\/rails|rails) generate\s*/, ""); | ||
| }); | ||
|
|
||
| stream.button({ | ||
| command: Command.RailsGenerate, | ||
| title: "Generate with Rails", | ||
| arguments: [commandList, workspace], | ||
| }); | ||
|
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||
| stream.button({ | ||
| command: Command.RailsDestroy, | ||
| title: "Revert previous generation", | ||
| arguments: [commandList, workspace], | ||
| }); | ||
| } | ||
| } catch (err) { | ||
| this.handleError(err, stream); | ||
| } | ||
|
|
||
| return { metadata: { command: "design" } }; | ||
| } | ||
|
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| private async schema(workspace: Workspace) { | ||
| try { | ||
| const content = await vscode.workspace.fs.readFile( | ||
| vscode.Uri.joinPath(workspace.workspaceFolder.uri, "db/schema.rb"), | ||
| ); | ||
| return content.toString(); | ||
| } catch (error) { | ||
| // db/schema.rb doesn't exist | ||
| } | ||
|
|
||
| try { | ||
| const content = await vscode.workspace.fs.readFile( | ||
| vscode.Uri.joinPath(workspace.workspaceFolder.uri, "db/structure.sql"), | ||
| ); | ||
| return content.toString(); | ||
| } catch (error) { | ||
| // db/structure.sql doesn't exist | ||
| } | ||
|
|
||
| return undefined; | ||
| } | ||
|
|
||
| // Returns `true` if the current or any previous interactions with the chat match the given `command`. Useful for | ||
| // ensuring that the user can continue chatting without having to re-type the desired command multiple times | ||
| private withinConversation( | ||
| command: string, | ||
| request: vscode.ChatRequest, | ||
| context: vscode.ChatContext, | ||
| ) { | ||
| return ( | ||
| request.command === command || | ||
| (!request.command && | ||
| context.history.some( | ||
| (entry) => | ||
| entry instanceof vscode.ChatRequestTurn && | ||
| entry.command === command, | ||
| )) | ||
| ); | ||
| } | ||
|
|
||
| // Default error handling | ||
| private handleError(err: any, stream: vscode.ChatResponseStream) { | ||
| if (err instanceof vscode.LanguageModelError) { | ||
| if ( | ||
| err.cause instanceof Error && | ||
| err.cause.message.includes("off_topic") | ||
| ) { | ||
| stream.markdown( | ||
| "Sorry, I can only help you with Ruby related questions", | ||
| ); | ||
| } | ||
| } else { | ||
| throw err; | ||
| } | ||
| } | ||
|
|
||
| // Get the content of all previous interactions (including requests and responses) as a string | ||
| private previousInteractions(context: vscode.ChatContext): string { | ||
| let history = ""; | ||
|
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||
| context.history.forEach((entry) => { | ||
| if (entry instanceof vscode.ChatResponseTurn) { | ||
| if (entry.participant === CHAT_AGENT_ID) { | ||
| let content = ""; | ||
|
|
||
| entry.response.forEach((part) => { | ||
| if (part instanceof vscode.ChatResponseMarkdownPart) { | ||
| content += part.value.value; | ||
| } | ||
| }); | ||
|
|
||
| history += `Response: ${content}`; | ||
| } | ||
| } else { | ||
| history += `Request: ${entry.prompt}`; | ||
| } | ||
| }); | ||
|
|
||
| return history; | ||
| } | ||
| } |
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