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William Valentin 228e7d86bd docs: add TUI redesign implementation plan with 14 tasks

2026-02-05 10:44:49 -08:00

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TUI Redesign Implementation Plan

For Claude: REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.

Goal: Add streaming responses, markdown rendering, model switching, and scrollable message history to Flynn TUI.

Architecture: Extend ModelClient interface with optional streaming method. Create shared utilities for markdown rendering and command parsing. Update both minimal and fullscreen modes to use streaming with markdown post-processing.

Tech Stack: TypeScript, Vitest, Ink (React), marked, marked-terminal, cli-highlight

Task 1: Add Streaming Types

Files:

Modify: src/models/types.ts
Test: src/models/types.test.ts (create)

Step 1: Write the type definitions

Edit src/models/types.ts to add streaming types:

export interface Message {
  role: 'user' | 'assistant';
  content: string;
}

export interface ChatRequest {
  messages: Message[];
  system?: string;
  maxTokens?: number;
}

export interface ChatResponse {
  content: string;
  stopReason: 'end_turn' | 'max_tokens' | 'stop_sequence' | string;
  usage: TokenUsage;
}

export interface TokenUsage {
  inputTokens: number;
  outputTokens: number;
}

export interface ChatStreamEvent {
  type: 'content' | 'done' | 'error';
  content?: string;
  usage?: TokenUsage;
  error?: Error;
}

export interface StreamingModelClient {
  chatStream(request: ChatRequest): AsyncIterable<ChatStreamEvent>;
}

export interface ModelClient {
  chat(request: ChatRequest): Promise<ChatResponse>;
  chatStream?(request: ChatRequest): AsyncIterable<ChatStreamEvent>;
}

Step 2: Run build to verify types compile

Run: pnpm build Expected: Success, no type errors

Step 3: Commit

git add src/models/types.ts
git commit -m "feat(models): add streaming types for chat responses"

Task 2: Implement AnthropicClient Streaming

Files:

Modify: src/models/anthropic.ts
Test: src/models/anthropic.test.ts

Step 1: Write the failing test

Add to src/models/anthropic.test.ts:

describe('AnthropicClient streaming', () => {
  it('streams messages chunk by chunk', async () => {
    const client = new AnthropicClient({
      apiKey: 'test-key',
      model: 'claude-sonnet-4-20250514',
    });

    const chunks: string[] = [];
    let finalUsage: { inputTokens: number; outputTokens: number } | undefined;

    for await (const event of client.chatStream({
      messages: [{ role: 'user', content: 'Hello' }],
    })) {
      if (event.type === 'content' && event.content) {
        chunks.push(event.content);
      }
      if (event.type === 'done' && event.usage) {
        finalUsage = event.usage;
      }
    }

    expect(chunks.length).toBeGreaterThan(0);
    expect(chunks.join('')).toBe('Hello from Claude!');
    expect(finalUsage).toEqual({ inputTokens: 10, outputTokens: 5 });
  });
});

Step 2: Update mock to support streaming

Update the mock at the top of src/models/anthropic.test.ts:

vi.mock('@anthropic-ai/sdk', () => ({
  default: vi.fn().mockImplementation(() => ({
    messages: {
      create: vi.fn().mockResolvedValue({
        content: [{ type: 'text', text: 'Hello from Claude!' }],
        stop_reason: 'end_turn',
        usage: { input_tokens: 10, output_tokens: 5 },
      }),
      stream: vi.fn().mockReturnValue({
        [Symbol.asyncIterator]: async function* () {
          yield { type: 'content_block_delta', delta: { type: 'text_delta', text: 'Hello ' } };
          yield { type: 'content_block_delta', delta: { type: 'text_delta', text: 'from ' } };
          yield { type: 'content_block_delta', delta: { type: 'text_delta', text: 'Claude!' } };
        },
        finalMessage: vi.fn().mockResolvedValue({
          usage: { input_tokens: 10, output_tokens: 5 },
        }),
      }),
    },
  })),
}));

Step 3: Run test to verify it fails

Run: pnpm test:run src/models/anthropic.test.ts Expected: FAIL - chatStream is not a function

Step 4: Implement chatStream method

Update src/models/anthropic.ts:

import Anthropic from '@anthropic-ai/sdk';
import type { ChatRequest, ChatResponse, ChatStreamEvent, ModelClient } from './types.js';

export interface AnthropicClientConfig {
  apiKey?: string;
  authToken?: string;
  model: string;
  maxTokens?: number;
}

export class AnthropicClient implements ModelClient {
  private client: Anthropic;
  private model: string;
  private defaultMaxTokens: number;

  constructor(config: AnthropicClientConfig) {
    this.client = new Anthropic({
      apiKey: config.apiKey,
      authToken: config.authToken,
    });
    this.model = config.model;
    this.defaultMaxTokens = config.maxTokens ?? 4096;
  }

  async chat(request: ChatRequest): Promise<ChatResponse> {
    const response = await this.client.messages.create({
      model: this.model,
      max_tokens: request.maxTokens ?? this.defaultMaxTokens,
      system: request.system,
      messages: request.messages.map((m) => ({
        role: m.role,
        content: m.content,
      })),
    });

    const textContent = response.content.find((c) => c.type === 'text');
    const content = textContent?.type === 'text' ? textContent.text : '';

    return {
      content,
      stopReason: response.stop_reason ?? 'end_turn',
      usage: {
        inputTokens: response.usage.input_tokens,
        outputTokens: response.usage.output_tokens,
      },
    };
  }

  async *chatStream(request: ChatRequest): AsyncIterable<ChatStreamEvent> {
    const stream = this.client.messages.stream({
      model: this.model,
      max_tokens: request.maxTokens ?? this.defaultMaxTokens,
      system: request.system,
      messages: request.messages.map((m) => ({
        role: m.role,
        content: m.content,
      })),
    });

    try {
      for await (const event of stream) {
        if (event.type === 'content_block_delta' && event.delta.type === 'text_delta') {
          yield { type: 'content', content: event.delta.text };
        }
      }

      const finalMessage = await stream.finalMessage();
      yield {
        type: 'done',
        usage: {
          inputTokens: finalMessage.usage.input_tokens,
          outputTokens: finalMessage.usage.output_tokens,
        },
      };
    } catch (error) {
      yield {
        type: 'error',
        error: error instanceof Error ? error : new Error(String(error)),
      };
    }
  }
}

Step 5: Run test to verify it passes

Run: pnpm test:run src/models/anthropic.test.ts Expected: PASS

Step 6: Commit

git add src/models/anthropic.ts src/models/anthropic.test.ts
git commit -m "feat(models): add streaming support to AnthropicClient"

Task 3: Add Streaming to ModelRouter

Files:

Modify: src/models/router.ts
Test: src/models/router.test.ts

Step 1: Write the failing test

Add to src/models/router.test.ts:

describe('ModelRouter streaming', () => {
  it('streams from primary client', async () => {
    const mockStream = async function* (): AsyncIterable<ChatStreamEvent> {
      yield { type: 'content', content: 'Hello' };
      yield { type: 'done', usage: { inputTokens: 5, outputTokens: 3 } };
    };

    const mockClient = {
      chat: vi.fn(),
      chatStream: vi.fn().mockReturnValue(mockStream()),
    };

    const router = new ModelRouter({
      default: mockClient,
      fallbackChain: [],
    });

    const chunks: string[] = [];
    for await (const event of router.chatStream({ messages: [] })) {
      if (event.type === 'content' && event.content) {
        chunks.push(event.content);
      }
    }

    expect(chunks).toEqual(['Hello']);
  });

  it('falls back when primary stream fails', async () => {
    const failingStream = async function* (): AsyncIterable<ChatStreamEvent> {
      yield { type: 'error', error: new Error('Primary failed') };
    };

    const fallbackStream = async function* (): AsyncIterable<ChatStreamEvent> {
      yield { type: 'content', content: 'Fallback' };
      yield { type: 'done', usage: { inputTokens: 5, outputTokens: 3 } };
    };

    const primaryClient = {
      chat: vi.fn(),
      chatStream: vi.fn().mockReturnValue(failingStream()),
    };

    const fallbackClient = {
      chat: vi.fn(),
      chatStream: vi.fn().mockReturnValue(fallbackStream()),
    };

    const router = new ModelRouter({
      default: primaryClient,
      fallbackChain: [fallbackClient],
    });

    const chunks: string[] = [];
    for await (const event of router.chatStream({ messages: [] })) {
      if (event.type === 'content' && event.content) {
        chunks.push(event.content);
      }
    }

    expect(chunks).toEqual(['Fallback']);
  });
});

Step 2: Add import for ChatStreamEvent

At top of src/models/router.test.ts, update import:

import type { ChatStreamEvent } from './types.js';

Step 3: Run test to verify it fails

Run: pnpm test:run src/models/router.test.ts Expected: FAIL - chatStream is not a function

Step 4: Implement chatStream in ModelRouter

Update src/models/router.ts:

import type { ChatRequest, ChatResponse, ChatStreamEvent, ModelClient } from './types.js';

export type ModelTier = 'fast' | 'default' | 'complex' | 'local';

export interface ModelRouterConfig {
  default: ModelClient;
  fast?: ModelClient;
  complex?: ModelClient;
  local?: ModelClient;
  fallbackChain: ModelClient[];
}

export class ModelRouter implements ModelClient {
  private clients: Map<ModelTier, ModelClient>;
  private defaultClient: ModelClient;
  private fallbackChain: ModelClient[];
  private currentTier: ModelTier = 'default';

  constructor(config: ModelRouterConfig) {
    this.clients = new Map();
    this.defaultClient = config.default;
    this.fallbackChain = config.fallbackChain;

    this.clients.set('default', config.default);
    if (config.fast) this.clients.set('fast', config.fast);
    if (config.complex) this.clients.set('complex', config.complex);
    if (config.local) this.clients.set('local', config.local);
  }

  setTier(tier: ModelTier): boolean {
    if (this.clients.has(tier)) {
      this.currentTier = tier;
      return true;
    }
    return false;
  }

  getTier(): ModelTier {
    return this.currentTier;
  }

  getAvailableTiers(): ModelTier[] {
    return Array.from(this.clients.keys());
  }

  async chat(request: ChatRequest, tier?: ModelTier): Promise<ChatResponse> {
    const useTier = tier ?? this.currentTier;
    const primaryClient = this.clients.get(useTier) ?? this.defaultClient;
    const errors: Error[] = [];

    try {
      return await primaryClient.chat(request);
    } catch (error) {
      errors.push(error instanceof Error ? error : new Error(String(error)));
      console.warn(`Primary model failed: ${errors[0].message}`);
    }

    for (const fallbackClient of this.fallbackChain) {
      try {
        console.log('Trying fallback model...');
        return await fallbackClient.chat(request);
      } catch (error) {
        errors.push(error instanceof Error ? error : new Error(String(error)));
        console.warn(`Fallback model failed: ${errors[errors.length - 1].message}`);
      }
    }

    throw new Error(`All model providers failed: ${errors.map(e => e.message).join(', ')}`);
  }

  async *chatStream(request: ChatRequest, tier?: ModelTier): AsyncIterable<ChatStreamEvent> {
    const useTier = tier ?? this.currentTier;
    const primaryClient = this.clients.get(useTier) ?? this.defaultClient;

    if (primaryClient.chatStream) {
      let hasError = false;
      for await (const event of primaryClient.chatStream(request)) {
        if (event.type === 'error') {
          hasError = true;
          console.warn(`Primary stream failed: ${event.error?.message}`);
          break;
        }
        yield event;
      }

      if (!hasError) return;
    }

    // Try fallback chain
    for (const fallbackClient of this.fallbackChain) {
      if (!fallbackClient.chatStream) continue;

      let hasError = false;
      for await (const event of fallbackClient.chatStream(request)) {
        if (event.type === 'error') {
          hasError = true;
          console.warn(`Fallback stream failed: ${event.error?.message}`);
          break;
        }
        yield event;
      }

      if (!hasError) return;
    }

    yield { type: 'error', error: new Error('All streaming providers failed') };
  }

  getClient(tier: ModelTier): ModelClient | undefined {
    return this.clients.get(tier);
  }
}

Step 5: Run test to verify it passes

Run: pnpm test:run src/models/router.test.ts Expected: PASS

Step 6: Commit

git add src/models/router.ts src/models/router.test.ts
git commit -m "feat(models): add streaming and tier switching to ModelRouter"

Task 4: Install Markdown Dependencies

Files:

Modify: package.json

Step 1: Install dependencies

Run: pnpm add marked marked-terminal cli-highlight

Step 2: Install types

Run: pnpm add -D @types/marked-terminal

Step 3: Verify installation

Run: pnpm build Expected: Success

Step 4: Commit

git add package.json pnpm-lock.yaml
git commit -m "chore: add markdown rendering dependencies"

Task 5: Create Markdown Rendering Utility

Files:

Create: src/frontends/tui/markdown.ts
Create: src/frontends/tui/markdown.test.ts

Step 1: Write the failing tests

Create src/frontends/tui/markdown.test.ts:

import { describe, it, expect } from 'vitest';
import { renderMarkdown } from './markdown.js';

describe('renderMarkdown', () => {
  it('renders plain text unchanged', () => {
    const result = renderMarkdown('Hello world');
    expect(result).toContain('Hello world');
  });

  it('renders bold text', () => {
    const result = renderMarkdown('This is **bold** text');
    expect(result).toContain('bold');
  });

  it('renders code blocks', () => {
    const result = renderMarkdown('```javascript\nconst x = 1;\n```');
    expect(result).toContain('const');
    expect(result).toContain('x');
  });

  it('renders inline code', () => {
    const result = renderMarkdown('Use `console.log()` for debugging');
    expect(result).toContain('console.log()');
  });

  it('renders lists', () => {
    const result = renderMarkdown('- Item 1\n- Item 2');
    expect(result).toContain('Item 1');
    expect(result).toContain('Item 2');
  });
});

Step 2: Run test to verify it fails

Run: pnpm test:run src/frontends/tui/markdown.test.ts Expected: FAIL - Cannot find module

Step 3: Implement markdown utility

Create src/frontends/tui/markdown.ts:

import { marked } from 'marked';
import TerminalRenderer from 'marked-terminal';
import { highlight } from 'cli-highlight';

// Configure marked with terminal renderer
marked.use({
  renderer: new TerminalRenderer({
    code: (code: string, language?: string) => {
      try {
        return highlight(code, { language: language || 'plaintext' });
      } catch {
        return code;
      }
    },
    codespan: (text: string) => `\x1b[36m${text}\x1b[0m`, // Cyan for inline code
    strong: (text: string) => `\x1b[1m${text}\x1b[0m`, // Bold
    em: (text: string) => `\x1b[3m${text}\x1b[0m`, // Italic
  }),
});

export function renderMarkdown(text: string): string {
  try {
    const rendered = marked.parse(text);
    // marked.parse can return string | Promise<string>, we only use sync
    if (typeof rendered === 'string') {
      return rendered.trim();
    }
    return text;
  } catch {
    return text;
  }
}

Step 4: Run test to verify it passes

Run: pnpm test:run src/frontends/tui/markdown.test.ts Expected: PASS

Step 5: Commit

git add src/frontends/tui/markdown.ts src/frontends/tui/markdown.test.ts
git commit -m "feat(tui): add markdown rendering utility"

Task 6: Create Unified Command Parser

Files:

Create: src/frontends/tui/commands.ts
Create: src/frontends/tui/commands.test.ts

Step 1: Write the failing tests

Create src/frontends/tui/commands.test.ts:

import { describe, it, expect } from 'vitest';
import { parseCommand, getHelpText } from './commands.js';

describe('parseCommand', () => {
  it('parses /quit command', () => {
    expect(parseCommand('/quit')).toEqual({ type: 'quit' });
    expect(parseCommand('/exit')).toEqual({ type: 'quit' });
  });

  it('parses /reset command', () => {
    expect(parseCommand('/reset')).toEqual({ type: 'reset' });
    expect(parseCommand('/clear')).toEqual({ type: 'reset' });
  });

  it('parses /help command', () => {
    expect(parseCommand('/help')).toEqual({ type: 'help' });
    expect(parseCommand('/?')).toEqual({ type: 'help' });
  });

  it('parses /status command', () => {
    expect(parseCommand('/status')).toEqual({ type: 'status' });
  });

  it('parses /fullscreen command', () => {
    expect(parseCommand('/fullscreen')).toEqual({ type: 'fullscreen' });
    expect(parseCommand('/fs')).toEqual({ type: 'fullscreen' });
  });

  it('parses /model command without argument', () => {
    expect(parseCommand('/model')).toEqual({ type: 'model' });
  });

  it('parses /model command with argument', () => {
    expect(parseCommand('/model local')).toEqual({ type: 'model', name: 'local' });
    expect(parseCommand('/model opus')).toEqual({ type: 'model', name: 'opus' });
  });

  it('parses /transfer command', () => {
    expect(parseCommand('/transfer telegram')).toEqual({ type: 'transfer', target: 'telegram' });
  });

  it('parses regular message', () => {
    expect(parseCommand('Hello Flynn')).toEqual({ type: 'message', content: 'Hello Flynn' });
  });

  it('returns null for empty input', () => {
    expect(parseCommand('')).toBeNull();
    expect(parseCommand('   ')).toBeNull();
  });
});

describe('getHelpText', () => {
  it('returns help text with all commands', () => {
    const help = getHelpText();
    expect(help).toContain('/help');
    expect(help).toContain('/model');
    expect(help).toContain('/reset');
    expect(help).toContain('/quit');
  });
});

Step 2: Run test to verify it fails

Run: pnpm test:run src/frontends/tui/commands.test.ts Expected: FAIL - Cannot find module

Step 3: Implement commands utility

Create src/frontends/tui/commands.ts:

export type Command =
  | { type: 'quit' }
  | { type: 'reset' }
  | { type: 'help' }
  | { type: 'status' }
  | { type: 'fullscreen' }
  | { type: 'model'; name?: string }
  | { type: 'transfer'; target: string }
  | { type: 'message'; content: string };

export function parseCommand(input: string): Command | null {
  const trimmed = input.trim();
  if (!trimmed) return null;

  // Quit
  if (trimmed === '/quit' || trimmed === '/exit') {
    return { type: 'quit' };
  }

  // Reset
  if (trimmed === '/reset' || trimmed === '/clear') {
    return { type: 'reset' };
  }

  // Help
  if (trimmed === '/help' || trimmed === '/?') {
    return { type: 'help' };
  }

  // Status
  if (trimmed === '/status') {
    return { type: 'status' };
  }

  // Fullscreen
  if (trimmed === '/fullscreen' || trimmed === '/fs') {
    return { type: 'fullscreen' };
  }

  // Model (with optional argument)
  if (trimmed === '/model') {
    return { type: 'model' };
  }
  if (trimmed.startsWith('/model ')) {
    const name = trimmed.slice('/model '.length).trim();
    return { type: 'model', name };
  }

  // Transfer
  if (trimmed.startsWith('/transfer ')) {
    const target = trimmed.slice('/transfer '.length).trim();
    return { type: 'transfer', target };
  }

  // Regular message
  return { type: 'message', content: trimmed };
}

export function getHelpText(): string {
  return `
Commands:
  /help, /?          Show this help
  /model [name]      Show or switch model (local, default, fast, complex)
  /reset, /clear     Clear conversation history
  /status            Show session info and token usage
  /fullscreen, /fs   Switch to fullscreen mode
  /transfer <dest>   Transfer session to another frontend
  /quit, /exit       Exit TUI
`.trim();
}

export type ModelAlias = 'local' | 'default' | 'fast' | 'complex' | 'opus' | 'sonnet' | 'ollama';

export function resolveModelAlias(alias: string): 'local' | 'default' | 'fast' | 'complex' {
  const map: Record<string, 'local' | 'default' | 'fast' | 'complex'> = {
    local: 'local',
    ollama: 'local',
    default: 'default',
    opus: 'default',
    fast: 'fast',
    sonnet: 'fast',
    complex: 'complex',
  };
  return map[alias.toLowerCase()] ?? 'default';
}

Step 4: Run test to verify it passes

Run: pnpm test:run src/frontends/tui/commands.test.ts Expected: PASS

Step 5: Commit

git add src/frontends/tui/commands.ts src/frontends/tui/commands.test.ts
git commit -m "feat(tui): add unified command parser with model switching"

Task 7: Update Minimal TUI with Streaming

Files:

Modify: src/frontends/tui/minimal.ts
Modify: src/frontends/tui/minimal.test.ts

Step 1: Update minimal.ts imports and types

Update src/frontends/tui/minimal.ts with the new implementation:

import * as readline from 'node:readline';
import type { ManagedSession } from '../../session/index.js';
import type { ModelClient, TokenUsage } from '../../models/types.js';
import type { ModelRouter, ModelTier } from '../../models/router.js';
import { parseCommand, getHelpText, resolveModelAlias, type Command } from './commands.js';
import { renderMarkdown } from './markdown.js';

export { parseCommand, type Command };

export function formatPrompt(state: 'default' | 'thinking'): string {
  if (state === 'thinking') {
    return 'flynn... ';
  }
  return 'flynn> ';
}

export interface MinimalTuiConfig {
  session: ManagedSession;
  modelClient: ModelClient;
  modelRouter?: ModelRouter;
  systemPrompt: string;
  onFullscreen?: () => void;
  onTransfer?: (target: string) => void;
}

export class MinimalTui {
  private rl: readline.Interface | null = null;
  private running = false;
  private totalUsage: TokenUsage = { inputTokens: 0, outputTokens: 0 };

  constructor(private config: MinimalTuiConfig) {}

  async start(): Promise<void> {
    this.running = true;

    this.rl = readline.createInterface({
      input: process.stdin,
      output: process.stdout,
    });

    console.log('Flynn TUI (minimal mode)');
    console.log('Type /help for commands, /fullscreen for panel mode\n');

    await this.promptLoop();
  }

  private async promptLoop(): Promise<void> {
    while (this.running && this.rl) {
      const input = await this.prompt(formatPrompt('default'));
      const command = parseCommand(input);

      if (!command) {
        continue;
      }

      await this.handleCommand(command);
    }
  }

  private prompt(promptText: string): Promise<string> {
    return new Promise((resolve) => {
      if (!this.rl) {
        resolve('');
        return;
      }
      this.rl.question(promptText, resolve);
      this.rl.once('close', () => resolve(''));
    });
  }

  private async handleCommand(command: Command): Promise<void> {
    switch (command.type) {
      case 'quit':
        this.stop();
        break;

      case 'reset':
        this.config.session.clear();
        this.totalUsage = { inputTokens: 0, outputTokens: 0 };
        console.log('Session cleared.\n');
        break;

      case 'help':
        console.log(getHelpText() + '\n');
        break;

      case 'status':
        this.printStatus();
        break;

      case 'fullscreen':
        this.config.onFullscreen?.();
        break;

      case 'model':
        this.handleModelCommand(command.name);
        break;

      case 'transfer':
        this.config.onTransfer?.(command.target);
        break;

      case 'message':
        await this.handleMessage(command.content);
        break;
    }
  }

  private handleModelCommand(name?: string): void {
    const router = this.config.modelRouter;
    if (!router) {
      console.log('Model switching not available.\n');
      return;
    }

    if (!name) {
      const current = router.getTier();
      const available = router.getAvailableTiers();
      console.log(`Current model: ${current}`);
      console.log(`Available: ${available.join(', ')}\n`);
      return;
    }

    const tier = resolveModelAlias(name);
    if (router.setTier(tier)) {
      console.log(`Switched to model: ${tier}\n`);
    } else {
      console.log(`Model not available: ${name}\n`);
    }
  }

  private printStatus(): void {
    console.log(`Session: ${this.config.session.id}`);
    console.log(`Messages: ${this.config.session.getHistory().length}`);
    console.log(`Tokens: ${this.totalUsage.inputTokens} in / ${this.totalUsage.outputTokens} out\n`);
  }

  private async handleMessage(content: string): Promise<void> {
    this.config.session.addMessage({ role: 'user', content });

    process.stdout.write('\n');

    try {
      // Try streaming if available
      if (this.config.modelClient.chatStream) {
        let fullContent = '';

        for await (const event of this.config.modelClient.chatStream({
          messages: this.config.session.getHistory(),
          system: this.config.systemPrompt,
        })) {
          if (event.type === 'content' && event.content) {
            process.stdout.write(event.content);
            fullContent += event.content;
          }
          if (event.type === 'done' && event.usage) {
            this.totalUsage.inputTokens += event.usage.inputTokens;
            this.totalUsage.outputTokens += event.usage.outputTokens;
          }
          if (event.type === 'error') {
            throw event.error ?? new Error('Stream error');
          }
        }

        console.log('\n');

        // Render markdown for the complete response
        const rendered = renderMarkdown(fullContent);
        // Clear and reprint with markdown (optional: skip if terminal doesn't support)
        // For now, just save the raw content
        this.config.session.addMessage({ role: 'assistant', content: fullContent });
      } else {
        // Fallback to non-streaming
        const response = await this.config.modelClient.chat({
          messages: this.config.session.getHistory(),
          system: this.config.systemPrompt,
        });

        const rendered = renderMarkdown(response.content);
        console.log(rendered);
        console.log();

        this.totalUsage.inputTokens += response.usage.inputTokens;
        this.totalUsage.outputTokens += response.usage.outputTokens;

        this.config.session.addMessage({ role: 'assistant', content: response.content });
      }
    } catch (error) {
      console.error('Error:', error instanceof Error ? error.message : error);
      console.log();
    }
  }

  stop(preserveStdin = false): void {
    this.running = false;
    if (this.rl) {
      if (preserveStdin) {
        this.rl.removeAllListeners();
        process.stdin.removeAllListeners('keypress');
        process.stdin.pause();
      }
      this.rl.close();
      this.rl = null;
    }
  }
}

Step 2: Run tests to verify nothing broke

Run: pnpm test:run src/frontends/tui/minimal.test.ts Expected: Some tests may need updating

Step 3: Update minimal.test.ts for new imports

Update src/frontends/tui/minimal.test.ts:

import { describe, it, expect } from 'vitest';
import { formatPrompt, parseCommand } from './minimal.js';

describe('formatPrompt', () => {
  it('formats default prompt', () => {
    const prompt = formatPrompt('default');
    expect(prompt).toBe('flynn> ');
  });

  it('formats thinking prompt', () => {
    const prompt = formatPrompt('thinking');
    expect(prompt).toContain('...');
  });
});

describe('parseCommand (re-exported)', () => {
  it('parses /quit command', () => {
    const result = parseCommand('/quit');
    expect(result).toEqual({ type: 'quit' });
  });

  it('parses /model command', () => {
    const result = parseCommand('/model local');
    expect(result).toEqual({ type: 'model', name: 'local' });
  });

  it('parses regular message', () => {
    const result = parseCommand('Hello, Flynn!');
    expect(result).toEqual({ type: 'message', content: 'Hello, Flynn!' });
  });

  it('returns null for empty input', () => {
    const result = parseCommand('');
    expect(result).toBeNull();
  });
});

Step 4: Run tests to verify they pass

Run: pnpm test:run src/frontends/tui/minimal.test.ts Expected: PASS

Step 5: Commit

git add src/frontends/tui/minimal.ts src/frontends/tui/minimal.test.ts
git commit -m "feat(tui): add streaming and model switching to minimal mode"

Task 8: Update TUI Entry Point

Files:

Modify: src/tui.ts

Step 1: Update tui.ts to pass modelRouter

Update src/tui.ts:

import { loadConfig } from './config/index.js';
import { SessionStore, SessionManager } from './session/index.js';
import { AnthropicClient, OpenAIClient, OllamaClient, ModelRouter } from './models/index.js';
import { MinimalTui, startFullscreenTui } from './frontends/tui/index.js';
import type { Config } from './config/index.js';
import { resolve } from 'path';
import { homedir } from 'os';
import { existsSync, mkdirSync } from 'fs';

const CONFIG_PATH = process.env.FLYNN_CONFIG
  ?? resolve(homedir(), '.config/flynn/config.yaml');

const SYSTEM_PROMPT = `You are Flynn, a helpful personal AI assistant. You are direct, concise, and helpful. You can help with a variety of tasks including answering questions, providing information, and having conversations.

Keep responses focused and avoid unnecessary verbosity. Use markdown formatting when it improves readability.`;

function createModelRouter(config: Config): ModelRouter {
  const models = config.models;

  const defaultClient = new AnthropicClient({
    model: models.default.model,
    apiKey: models.default.api_key,
    authToken: models.default.auth_token,
  });

  let fastClient;
  let complexClient;
  let localClient;

  if (models.fast) {
    fastClient = new AnthropicClient({
      model: models.fast.model,
      apiKey: models.fast.api_key,
      authToken: models.fast.auth_token,
    });
  }

  if (models.complex) {
    complexClient = new AnthropicClient({
      model: models.complex.model,
      apiKey: models.complex.api_key,
      authToken: models.complex.auth_token,
    });
  }

  if (models.local) {
    if (models.local.provider === 'ollama') {
      localClient = new OllamaClient({
        model: models.local.model,
        host: models.local.endpoint,
      });
    }
  }

  const fallbackChain = [];
  for (const providerName of models.fallback_chain) {
    if (providerName === 'openai') {
      fallbackChain.push(new OpenAIClient({ model: 'gpt-4o' }));
    } else if (providerName === 'local' && localClient) {
      fallbackChain.push(localClient);
    }
  }

  return new ModelRouter({
    default: defaultClient,
    fast: fastClient,
    complex: complexClient,
    local: localClient,
    fallbackChain,
  });
}

async function main() {
  const args = process.argv.slice(2);
  const fullscreenMode = args.includes('--fullscreen') || args.includes('-f');

  console.log('Flynn TUI starting...');

  if (!existsSync(CONFIG_PATH)) {
    console.error(`Config file not found: ${CONFIG_PATH}`);
    console.error('Copy config/default.yaml to ~/.config/flynn/config.yaml and configure it.');
    process.exit(1);
  }

  const config = loadConfig(CONFIG_PATH);

  // Ensure data directory exists
  const dataDir = resolve(homedir(), '.local/share/flynn');
  mkdirSync(dataDir, { recursive: true });

  // Initialize components
  const sessionStore = new SessionStore(resolve(dataDir, 'sessions.db'));
  const sessionManager = new SessionManager(sessionStore);
  const modelRouter = createModelRouter(config);

  // Get TUI session
  const session = sessionManager.getSession('tui', 'local');

  const cleanup = () => {
    sessionStore.close();
  };

  process.on('SIGINT', () => {
    cleanup();
    process.exit(0);
  });

  if (fullscreenMode) {
    // Start fullscreen Ink UI
    await startFullscreenTui({
      session,
      modelClient: modelRouter,
      modelRouter,
      systemPrompt: SYSTEM_PROMPT,
      model: config.models.default.model,
      onExit: cleanup,
    });
  } else {
    // Start minimal readline UI
    let switchingToFullscreen = false;

    const tui = new MinimalTui({
      session,
      modelClient: modelRouter,
      modelRouter,
      systemPrompt: SYSTEM_PROMPT,
      onTransfer: (target) => {
        if (target === 'telegram') {
          const telegramUserId = String(config.telegram.allowed_chat_ids[0]);
          sessionManager.transferSession('tui', 'local', 'telegram', telegramUserId);
          console.log(`Session transferred to Telegram (${telegramUserId})\n`);
        } else {
          console.log(`Unknown transfer target: ${target}\n`);
        }
      },
      onFullscreen: () => {
        switchingToFullscreen = true;
        tui.stop(true);
      },
    });

    await tui.start();

    if (switchingToFullscreen) {
      console.clear();
      await startFullscreenTui({
        session,
        modelClient: modelRouter,
        modelRouter,
        systemPrompt: SYSTEM_PROMPT,
        model: config.models.default.model,
        onExit: cleanup,
      });
      return;
    }
  }

  cleanup();
}

main().catch((error) => {
  console.error('Failed to start TUI:', error);
  process.exit(1);
});

Step 2: Build to verify

Run: pnpm build Expected: May fail - need to update fullscreen types

Step 3: Commit (if build passes)

git add src/tui.ts
git commit -m "feat(tui): pass modelRouter to both TUI modes"

Task 9: Update Fullscreen TUI Config

Files:

Modify: src/frontends/tui/fullscreen.ts
Modify: src/frontends/tui/index.ts

Step 1: Update fullscreen.ts types

Update src/frontends/tui/fullscreen.ts:

import React from 'react';
import { render } from 'ink';
import { App } from './components/index.js';
import type { ManagedSession } from '../../session/index.js';
import type { ModelClient } from '../../models/types.js';
import type { ModelRouter } from '../../models/router.js';

export interface FullscreenTuiConfig {
  session: ManagedSession;
  modelClient: ModelClient;
  modelRouter?: ModelRouter;
  systemPrompt: string;
  model: string;
  onExit?: () => void;
}

export async function startFullscreenTui(config: FullscreenTuiConfig): Promise<void> {
  // Ensure stdin is in a clean state for Ink
  if (process.stdin.isPaused()) {
    process.stdin.resume();
  }

  const { waitUntilExit } = render(
    React.createElement(App, {
      session: config.session,
      modelClient: config.modelClient,
      modelRouter: config.modelRouter,
      systemPrompt: config.systemPrompt,
      model: config.model,
      onExit: config.onExit,
    })
  );

  await waitUntilExit();
}

Step 2: Update index.ts exports

Update src/frontends/tui/index.ts:

export { MinimalTui, formatPrompt, parseCommand } from './minimal.js';
export { startFullscreenTui, type FullscreenTuiConfig } from './fullscreen.js';
export { renderMarkdown } from './markdown.js';
export { parseCommand as parseCommandUtil, getHelpText, resolveModelAlias } from './commands.js';

Step 3: Build to verify

Run: pnpm build Expected: May need App.tsx updates

Step 4: Commit (if passes)

git add src/frontends/tui/fullscreen.ts src/frontends/tui/index.ts
git commit -m "feat(tui): update fullscreen config for model router"

Task 10: Update StatusBar Component

Files:

Modify: src/frontends/tui/components/StatusBar.tsx

Step 1: Update StatusBar with token usage

Update src/frontends/tui/components/StatusBar.tsx:

import React from 'react';
import { Box, Text } from 'ink';

export interface StatusBarProps {
  sessionId: string;
  messageCount: number;
  model: string;
  tokenUsage?: {
    input: number;
    output: number;
  };
  isStreaming?: boolean;
}

function formatTokens(n: number): string {
  if (n >= 1000) {
    return `${(n / 1000).toFixed(1)}k`;
  }
  return String(n);
}

export function StatusBar({
  sessionId,
  messageCount,
  model,
  tokenUsage,
  isStreaming,
}: StatusBarProps): React.ReactElement {
  // Extract short model name (e.g., "claude-opus-4-5-20251101" -> "opus-4.5")
  const shortModel = model
    .replace('claude-', '')
    .replace(/-\d{8}$/, '')
    .replace('-4-5', '-4.5');

  return (
    <Box borderStyle="single" borderColor="gray" paddingX={1}>
      <Box flexGrow={1}>
        <Text color="cyan">Flynn</Text>
        {isStreaming && (
          <>
            <Text color="gray"> | </Text>
            <Text color="yellow">streaming...</Text>
          </>
        )}
      </Box>
      <Box>
        <Text color="gray">Model: </Text>
        <Text color="green">{shortModel}</Text>
        <Text color="gray"> | </Text>
        <Text color="gray">Msgs: </Text>
        <Text>{messageCount}</Text>
        {tokenUsage && (
          <>
            <Text color="gray"> | </Text>
            <Text color="gray">Tokens: </Text>
            <Text>{formatTokens(tokenUsage.input)}/{formatTokens(tokenUsage.output)}</Text>
          </>
        )}
      </Box>
    </Box>
  );
}

Step 2: Build to verify

Run: pnpm build Expected: Success

Step 3: Commit

git add src/frontends/tui/components/StatusBar.tsx
git commit -m "feat(tui): enhance StatusBar with token usage and streaming indicator"

Task 11: Update MessageList with Markdown and Scroll

Files:

Modify: src/frontends/tui/components/MessageList.tsx

Step 1: Update MessageList

Update src/frontends/tui/components/MessageList.tsx:

import React from 'react';
import { Box, Text } from 'ink';
import type { Message } from '../../../models/types.js';
import { renderMarkdown } from '../markdown.js';

export interface MessageListProps {
  messages: Message[];
  scrollOffset?: number;
  streamingContent?: string;
}

export function MessageList({
  messages,
  scrollOffset = 0,
  streamingContent,
}: MessageListProps): React.ReactElement {
  // Calculate visible area (approximate, Ink handles overflow)
  const visibleMessages = messages.slice(scrollOffset);

  return (
    <Box flexDirection="column" flexGrow={1} paddingX={1} overflowY="hidden">
      {visibleMessages.length === 0 && !streamingContent ? (
        <Text color="gray">No messages yet. Start typing to chat with Flynn.</Text>
      ) : (
        <>
          {visibleMessages.map((message, index) => (
            <Box key={`${scrollOffset + index}-${message.role}`} marginBottom={1} flexDirection="column">
              <Text color={message.role === 'user' ? 'blue' : 'green'} bold>
                {message.role === 'user' ? 'You:' : 'Flynn:'}
              </Text>
              <Box marginLeft={1}>
                <Text wrap="wrap">
                  {message.role === 'assistant'
                    ? renderMarkdown(message.content)
                    : message.content}
                </Text>
              </Box>
            </Box>
          ))}
          {streamingContent && (
            <Box marginBottom={1} flexDirection="column">
              <Text color="green" bold>Flynn:</Text>
              <Box marginLeft={1}>
                <Text wrap="wrap">{streamingContent}</Text>
                <Text color="yellow">▌</Text>
              </Box>
            </Box>
          )}
        </>
      )}
      {messages.length > 0 && scrollOffset > 0 && (
        <Box position="absolute" marginTop={-1}>
          <Text color="gray">↑ {scrollOffset} more</Text>
        </Box>
      )}
    </Box>
  );
}

Step 2: Build to verify

Run: pnpm build Expected: Success

Step 3: Commit

git add src/frontends/tui/components/MessageList.tsx
git commit -m "feat(tui): add markdown rendering and scroll support to MessageList"

Task 12: Update App Component with Streaming and Scroll

Files:

Modify: src/frontends/tui/components/App.tsx

Step 1: Update App.tsx with full streaming support

Update src/frontends/tui/components/App.tsx:

import React, { useState, useCallback, useRef } from 'react';
import { Box, useApp, useInput } from 'ink';
import { StatusBar } from './StatusBar.js';
import { MessageList } from './MessageList.js';
import { InputBar } from './InputBar.js';
import { parseCommand, getHelpText, resolveModelAlias } from '../commands.js';
import type { Message, ModelClient, TokenUsage } from '../../../models/types.js';
import type { ModelRouter } from '../../../models/router.js';
import type { ManagedSession } from '../../../session/index.js';

export interface AppProps {
  session: ManagedSession;
  modelClient: ModelClient;
  modelRouter?: ModelRouter;
  systemPrompt: string;
  model: string;
  onExit?: () => void;
}

export function App({
  session,
  modelClient,
  modelRouter,
  systemPrompt,
  model,
  onExit,
}: AppProps): React.ReactElement {
  const { exit } = useApp();
  const [input, setInput] = useState('');
  const [messages, setMessages] = useState<Message[]>(session.getHistory());
  const [isStreaming, setIsStreaming] = useState(false);
  const [streamingContent, setStreamingContent] = useState('');
  const [scrollOffset, setScrollOffset] = useState(0);
  const [tokenUsage, setTokenUsage] = useState<TokenUsage>({ inputTokens: 0, outputTokens: 0 });
  const [currentModel, setCurrentModel] = useState(model);
  const abortRef = useRef(false);

  useInput((inputChar, key) => {
    if (key.escape) {
      if (isStreaming) {
        abortRef.current = true;
      } else {
        onExit?.();
        exit();
      }
    }

    // Scroll handling
    if (key.upArrow && scrollOffset > 0) {
      setScrollOffset(prev => Math.max(0, prev - 1));
    }
    if (key.downArrow) {
      setScrollOffset(prev => Math.min(messages.length - 1, prev + 1));
    }
    if (key.pageUp) {
      setScrollOffset(prev => Math.max(0, prev - 10));
    }
    if (key.pageDown) {
      setScrollOffset(prev => Math.min(messages.length - 1, prev + 10));
    }
  });

  const handleSubmit = useCallback(async (value: string) => {
    const command = parseCommand(value);
    if (!command) return;

    setInput('');

    // Handle commands
    switch (command.type) {
      case 'quit':
        onExit?.();
        exit();
        return;

      case 'reset':
        session.clear();
        setMessages([]);
        setTokenUsage({ inputTokens: 0, outputTokens: 0 });
        setScrollOffset(0);
        return;

      case 'help':
        // Show help as system message
        setMessages(prev => [...prev, { role: 'assistant', content: getHelpText() }]);
        return;

      case 'status':
        const status = `Session: ${session.id}\nMessages: ${messages.length}\nTokens: ${tokenUsage.inputTokens} in / ${tokenUsage.outputTokens} out`;
        setMessages(prev => [...prev, { role: 'assistant', content: status }]);
        return;

      case 'model':
        if (!modelRouter) {
          setMessages(prev => [...prev, { role: 'assistant', content: 'Model switching not available.' }]);
          return;
        }
        if (!command.name) {
          const info = `Current: ${modelRouter.getTier()}\nAvailable: ${modelRouter.getAvailableTiers().join(', ')}`;
          setMessages(prev => [...prev, { role: 'assistant', content: info }]);
          return;
        }
        const tier = resolveModelAlias(command.name);
        if (modelRouter.setTier(tier)) {
          setCurrentModel(tier);
          setMessages(prev => [...prev, { role: 'assistant', content: `Switched to model: ${tier}` }]);
        } else {
          setMessages(prev => [...prev, { role: 'assistant', content: `Model not available: ${command.name}` }]);
        }
        return;

      case 'fullscreen':
        // Already in fullscreen
        return;

      case 'transfer':
        setMessages(prev => [...prev, { role: 'assistant', content: `Transfer not supported in fullscreen mode.` }]);
        return;

      case 'message':
        break; // Continue to message handling
    }

    if (command.type !== 'message' || isStreaming) return;

    // Add user message
    const userMessage: Message = { role: 'user', content: command.content };
    session.addMessage(userMessage);
    setMessages(prev => [...prev, userMessage]);
    setScrollOffset(0); // Auto-scroll to bottom

    // Stream response
    setIsStreaming(true);
    setStreamingContent('');
    abortRef.current = false;

    try {
      if (modelClient.chatStream) {
        let fullContent = '';

        for await (const event of modelClient.chatStream({
          messages: session.getHistory(),
          system: systemPrompt,
        })) {
          if (abortRef.current) {
            fullContent += '\n\n[interrupted]';
            break;
          }

          if (event.type === 'content' && event.content) {
            fullContent += event.content;
            setStreamingContent(fullContent);
          }
          if (event.type === 'done' && event.usage) {
            setTokenUsage(prev => ({
              inputTokens: prev.inputTokens + event.usage!.inputTokens,
              outputTokens: prev.outputTokens + event.usage!.outputTokens,
            }));
          }
          if (event.type === 'error') {
            throw event.error ?? new Error('Stream error');
          }
        }

        const assistantMessage: Message = { role: 'assistant', content: fullContent };
        session.addMessage(assistantMessage);
        setMessages(prev => [...prev, assistantMessage]);
      } else {
        // Fallback to non-streaming
        const response = await modelClient.chat({
          messages: session.getHistory(),
          system: systemPrompt,
        });

        setTokenUsage(prev => ({
          inputTokens: prev.inputTokens + response.usage.inputTokens,
          outputTokens: prev.outputTokens + response.usage.outputTokens,
        }));

        const assistantMessage: Message = { role: 'assistant', content: response.content };
        session.addMessage(assistantMessage);
        setMessages(prev => [...prev, assistantMessage]);
      }
    } catch (error) {
      const errorMessage: Message = {
        role: 'assistant',
        content: `⚠ Error: ${error instanceof Error ? error.message : 'Unknown error'}`,
      };
      setMessages(prev => [...prev, errorMessage]);
    } finally {
      setIsStreaming(false);
      setStreamingContent('');
    }
  }, [isStreaming, session, modelClient, modelRouter, systemPrompt, exit, onExit, messages.length, tokenUsage]);

  return (
    <Box flexDirection="column" height="100%">
      <StatusBar
        sessionId={session.id}
        messageCount={messages.length}
        model={currentModel}
        tokenUsage={{ input: tokenUsage.inputTokens, output: tokenUsage.outputTokens }}
        isStreaming={isStreaming}
      />
      <MessageList
        messages={messages}
        scrollOffset={scrollOffset}
        streamingContent={isStreaming ? streamingContent : undefined}
      />
      <InputBar
        value={input}
        onChange={setInput}
        onSubmit={handleSubmit}
        isLoading={isStreaming}
        placeholder={isStreaming ? 'Flynn is typing... (Esc to cancel)' : 'Type a message... (Esc=exit, /help)'}
      />
    </Box>
  );
}

Step 2: Build to verify

Run: pnpm build Expected: Success

Step 3: Commit

git add src/frontends/tui/components/App.tsx
git commit -m "feat(tui): add streaming, scroll, and model switching to fullscreen App"

Task 13: Update Component Exports

Files:

Modify: src/frontends/tui/components/index.ts

Step 1: Verify exports are correct

Check src/frontends/tui/components/index.ts:

export { App, type AppProps } from './App.js';
export { StatusBar, type StatusBarProps } from './StatusBar.js';
export { MessageList, type MessageListProps } from './MessageList.js';
export { InputBar, type InputBarProps } from './InputBar.js';

Step 2: Build and run full test suite

Run: pnpm test:run && pnpm build Expected: All tests pass, build succeeds

Step 3: Commit if needed

git add src/frontends/tui/components/index.ts
git commit -m "chore(tui): update component exports"

Task 14: Manual Integration Testing

Step 1: Test minimal mode streaming

Run: pnpm tui

Test:

Type "Hello" - should see streaming response
Type /model - should show available models
Type /model local - should switch model
Type /status - should show token count
Type /help - should show commands
Type /fs - should switch to fullscreen

Step 2: Test fullscreen mode

Run: pnpm tui -f

Test:

Type "Hello" - should see streaming with cursor
Press Up/Down arrows - should scroll
Type /model - should show models
Press Esc during streaming - should cancel
Press Esc when idle - should exit

Step 3: Final commit

git add -A
git commit -m "feat(tui): complete TUI redesign with streaming and markdown"

Summary

Tasks completed:

Streaming types added
AnthropicClient streaming implemented
ModelRouter streaming + tier switching
Markdown dependencies installed
Markdown rendering utility
Unified command parser
Minimal TUI with streaming
TUI entry point updated
Fullscreen config updated
StatusBar enhanced
MessageList with markdown/scroll
App with full streaming/scroll
Exports verified
Integration tested

Future tasks (from design doc):

Vim-like keybindings
Command palette
Multiple panes
Message-based navigation
Named sessions

49 KiB Raw Blame History

TUI Redesign Implementation Plan

Task 1: Add Streaming Types

Task 2: Implement AnthropicClient Streaming

Task 3: Add Streaming to ModelRouter

Task 4: Install Markdown Dependencies

Task 5: Create Markdown Rendering Utility

Task 6: Create Unified Command Parser

Task 7: Update Minimal TUI with Streaming

Task 8: Update TUI Entry Point

Task 9: Update Fullscreen TUI Config

Task 10: Update StatusBar Component

Task 11: Update MessageList with Markdown and Scroll

Task 12: Update App Component with Streaming and Scroll

Task 13: Update Component Exports

Task 14: Manual Integration Testing

Summary

49 KiB

Raw Blame History