attach default client to local daemon

CHANGELOG.md

@@ -13,6 +13,10 @@ loosely follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
   project listing, focused-pane snapshots, pane chunks, resize/focus
   updates, and daemon-owned command spawn requests while keeping child
   processes alive after a client disconnects.
+- The default `patterm [dir]` startup now auto-starts the local daemon
+  on demand and attaches a thin terminal client over the unix-socket
+  transport; `--in-process` or `PATTERM_NO_DAEMON=1` keeps the legacy
+  single-process path available as an escape hatch.
 - patterm can now keep multiple local projects loaded in one loopback
   daemon core, with command-palette entries to switch the current
   client view or open another project without tearing down processes

cmd/patterm/main.go

@@ -64,6 +64,7 @@ func main() {
 	var (
 		projectDir  = flag.String("project", "", "project directory (default $PWD)")
 		showVersion = flag.Bool("version", false, "print version and exit")
+		inProcess   = flag.Bool("in-process", false, "run the legacy single-process TUI instead of attaching to the daemon")
 		debugDir    = flag.String("debug", "", "write debug logs + per-child raw PTY output to DIR (auto-picks a dated subdir under $XDG_STATE_HOME/patterm/debug when DIR is omitted)")
 		profileDir  = flag.String("profile", "", "write pprof files (cpu/heap/goroutine) and live perf counters (metrics.jsonl per-second, metrics.json + summary.txt on exit) to DIR (auto-picks a dated subdir under $XDG_STATE_HOME/patterm/profile when DIR is omitted)")
 	)
@@ -84,6 +85,8 @@ func main() {
 	}
 	if *projectDir != "" {
 		cwd = *projectDir
+	} else if flag.NArg() > 0 {
+		cwd = flag.Arg(0)
 	}
 	key, err := projectkey.Key(cwd)
 	if err != nil {
@@ -107,11 +110,26 @@ func main() {
 	defer stopProfile()
 
 	ctx := context.Background()
-	if err := app.Run(ctx, app.Options{
+	if *inProcess || os.Getenv("PATTERM_NO_DAEMON") != "" {
+		if err := app.Run(ctx, app.Options{
+			ProjectDir: cwd,
+			ProjectKey: key,
+			DebugDir:   resolvedDebug,
+			ProfileDir: resolvedProfile,
+		}); err != nil {
+			die("%v", err)
+		}
+		return
+	}
+	if resolvedDebug != "" || resolvedProfile != "" {
+		die("--debug and --profile currently require --in-process")
+	}
+	if err := app.RunAttachedClient(ctx, app.ClientOptions{
 		ProjectDir: cwd,
-		ProjectKey: key,
+		Stdin:      os.Stdin,
-		DebugDir:   resolvedDebug,
+		Stdout:     os.Stdout,
-		ProfileDir: resolvedProfile,
+		RawMode:    true,
+		AutoStart:  true,
 	}); err != nil {
 		die("%v", err)
 	}
@@ -223,6 +241,8 @@ func runDaemonCommand() {
 	}
 	if *projectDir != "" {
 		cwd = *projectDir
+	} else if flag.NArg() > 0 {
+		cwd = flag.Arg(0)
 	}
 	if err := app.RunDaemon(context.Background(), app.DaemonOptions{ProjectDir: cwd}); err != nil {
 		die("daemon: %v", err)

internal/app/client_net.go

@@ -0,0 +1,637 @@
+package app
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"os"
+	"os/exec"
+	"os/signal"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+
+	cpty "github.com/creack/pty"
+	"golang.org/x/term"
+
+	"github.com/hjbdev/patterm/internal/protocol"
+)
+
+const (
+	clientKeyCtrlK       byte = 0x0b
+	clientKeyCtrlBracket byte = 0x1d
+)
+
+type ClientOptions struct {
+	ProjectDir string
+	Transport  protocol.Transport
+	Stdin      io.Reader
+	Stdout     io.Writer
+	RawMode    bool
+	AutoStart  bool
+	Cols       uint16
+	Rows       uint16
+}
+
+func RunAttachedClient(ctx context.Context, opts ClientOptions) error {
+	if opts.ProjectDir == "" {
+		cwd, err := os.Getwd()
+		if err != nil {
+			return err
+		}
+		opts.ProjectDir = cwd
+	}
+	if opts.Stdin == nil {
+		opts.Stdin = os.Stdin
+	}
+	if opts.Stdout == nil {
+		opts.Stdout = os.Stdout
+	}
+	if opts.Transport == nil {
+		t, err := dialDaemonTransport(opts.ProjectDir, opts.AutoStart)
+		if err != nil {
+			return err
+		}
+		opts.Transport = t
+		defer t.Close()
+	}
+	if opts.Cols == 0 || opts.Rows == 0 {
+		opts.Cols, opts.Rows = clientHostSize(opts.Stdin)
+	}
+	c := newNetClient(opts)
+	return c.run(ctx)
+}
+
+func dialDaemonTransport(projectDir string, autoStart bool) (protocol.Transport, error) {
+	socket, _, err := RuntimeDaemonPaths()
+	if err != nil {
+		return nil, err
+	}
+	conn, err := net.Dial("unix", socket)
+	if err == nil {
+		return protocol.NewConnTransport(conn), nil
+	}
+	if !autoStart {
+		return nil, err
+	}
+	if err := startDaemonProcess(projectDir); err != nil {
+		return nil, err
+	}
+	deadline := time.Now().Add(5 * time.Second)
+	var last error
+	for time.Now().Before(deadline) {
+		conn, err = net.Dial("unix", socket)
+		if err == nil {
+			return protocol.NewConnTransport(conn), nil
+		}
+		last = err
+		time.Sleep(50 * time.Millisecond)
+	}
+	return nil, fmt.Errorf("daemon did not become ready: %w", last)
+}
+
+func startDaemonProcess(projectDir string) error {
+	exe, err := os.Executable()
+	if err != nil {
+		return err
+	}
+	cmd := exec.Command(exe, "daemon", "--project", projectDir)
+	devNull, err := os.OpenFile(os.DevNull, os.O_RDWR, 0)
+	if err == nil {
+		defer devNull.Close()
+		cmd.Stdin = devNull
+		cmd.Stdout = devNull
+		cmd.Stderr = devNull
+	}
+	cmd.Env = os.Environ()
+	if err := cmd.Start(); err != nil {
+		return err
+	}
+	return cmd.Process.Release()
+}
+
+type netClient struct {
+	t          protocol.Transport
+	in         io.Reader
+	out        io.Writer
+	raw        bool
+	projectDir string
+	layout     terminalLayout
+
+	mu        sync.Mutex
+	focusedID string
+	chrome    chromeModel
+	renderer  *viewportRenderer
+	palette   *clientCommandPrompt
+}
+
+type clientCommandPrompt struct {
+	buf []byte
+}
+
+func newNetClient(opts ClientOptions) *netClient {
+	layout := newTerminalLayout(opts.Cols, opts.Rows)
+	return &netClient{
+		t:          opts.Transport,
+		in:         opts.Stdin,
+		out:        opts.Stdout,
+		raw:        opts.RawMode,
+		projectDir: opts.ProjectDir,
+		layout:     layout,
+		renderer:   newViewportRenderer(layout),
+	}
+}
+
+func (c *netClient) run(ctx context.Context) error {
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+	var restore *term.State
+	if c.raw {
+		if f, ok := c.in.(*os.File); ok && term.IsTerminal(int(f.Fd())) {
+			st, err := term.MakeRaw(int(f.Fd()))
+			if err != nil {
+				return err
+			}
+			restore = st
+			defer term.Restore(int(f.Fd()), restore)
+		}
+	}
+	c.enterScreen()
+	defer c.leaveScreen()
+
+	if err := c.sendAttach(); err != nil {
+		return err
+	}
+	errCh := make(chan error, 2)
+	go func() { errCh <- c.recvLoop(ctx, cancel) }()
+	go func() { errCh <- c.stdinLoop(ctx, cancel) }()
+	if f, ok := c.in.(*os.File); ok && term.IsTerminal(int(f.Fd())) {
+		winch := make(chan os.Signal, 1)
+		signal.Notify(winch, syscall.SIGWINCH)
+		defer signal.Stop(winch)
+		go func() {
+			for {
+				select {
+				case <-ctx.Done():
+					return
+				case <-winch:
+					cols, rows := clientHostSize(c.in)
+					_ = c.resize(cols, rows)
+					c.enterScreen()
+					c.drawChrome()
+				}
+			}
+		}()
+	}
+	select {
+	case <-ctx.Done():
+		_ = c.t.Close()
+		return nil
+	case err := <-errCh:
+		cancel()
+		_ = c.t.Close()
+		if errors.Is(err, io.EOF) || errors.Is(err, protocol.ErrTransportClosed) {
+			return nil
+		}
+		return err
+	}
+}
+
+func (c *netClient) sendAttach() error {
+	f, err := protocol.NewFrame(protocol.FrameAttach, protocol.Attach{
+		ProjectPath: c.projectPath(),
+		TermSize: protocol.Size{
+			Cols: c.layout.childCols(),
+			Rows: c.layout.childRows(),
+		},
+	})
+	if err != nil {
+		return err
+	}
+	return c.t.Send(f)
+}
+
+func (c *netClient) projectPath() string {
+	return c.projectDir
+}
+
+func (c *netClient) recvLoop(ctx context.Context, cancel func()) error {
+	for {
+		select {
+		case <-ctx.Done():
+			return nil
+		default:
+		}
+		f, err := c.t.Recv()
+		if err != nil {
+			return err
+		}
+		if err := c.handleFrame(f); err != nil {
+			return err
+		}
+		if f.Type == protocol.FrameDetach {
+			cancel()
+			return nil
+		}
+	}
+}
+
+func (c *netClient) handleFrame(f protocol.Frame) error {
+	switch f.Type {
+	case protocol.FrameError:
+		msg, _ := protocol.Decode[protocol.Error](f)
+		if msg.Message == "" {
+			msg.Message = "daemon error"
+		}
+		return fmt.Errorf("%s", msg.Message)
+	case protocol.FrameHello:
+		return nil
+	case protocol.FrameProjectList:
+		return nil
+	case protocol.FrameChrome:
+		msg, err := protocol.Decode[protocol.Chrome](f)
+		if err != nil {
+			return err
+		}
+		var model chromeModel
+		if err := json.Unmarshal(msg.Model, &model); err != nil {
+			return err
+		}
+		c.mu.Lock()
+		c.chrome = model
+		if model.FocusedID != "" {
+			c.focusedID = model.FocusedID
+		}
+		c.mu.Unlock()
+		c.drawChrome()
+	case protocol.FramePaneSnapshot:
+		msg, err := protocol.Decode[protocol.PaneSnapshot](f)
+		if err != nil {
+			return err
+		}
+		c.mu.Lock()
+		c.focusedID = msg.PaneID
+		c.renderer = newViewportRenderer(c.layout)
+		renderer := c.renderer
+		c.mu.Unlock()
+		c.clearViewport()
+		c.writeWrapped(renderer.Render(msg.Bytes))
+	case protocol.FramePaneChunk:
+		msg, err := protocol.Decode[protocol.PaneChunk](f)
+		if err != nil {
+			return err
+		}
+		c.mu.Lock()
+		focused := c.focusedID
+		renderer := c.renderer
+		c.mu.Unlock()
+		if msg.PaneID == focused && renderer != nil {
+			c.writeWrapped(renderer.Render(msg.Bytes))
+		}
+	case protocol.FrameLifecycle:
+		// The daemon follows lifecycle changes with chrome/snapshot updates
+		// when focus changes. Keep this as a wake point for future richer
+		// client-side state without blocking the frame stream.
+		return nil
+	}
+	return nil
+}
+
+func (c *netClient) stdinLoop(ctx context.Context, cancel func()) error {
+	buf := make([]byte, 4096)
+	for {
+		n, err := c.in.Read(buf)
+		if n > 0 {
+			if done, perr := c.processInput(buf[:n]); perr != nil || done {
+				cancel()
+				return perr
+			}
+		}
+		if err != nil {
+			if errors.Is(err, io.EOF) {
+				return nil
+			}
+			return err
+		}
+		select {
+		case <-ctx.Done():
+			return nil
+		default:
+		}
+	}
+}
+
+func (c *netClient) processInput(chunk []byte) (bool, error) {
+	c.mu.Lock()
+	if c.palette != nil {
+		p := c.palette
+		c.mu.Unlock()
+		return c.processPaletteInput(p, chunk)
+	}
+	c.mu.Unlock()
+
+	forward := make([]byte, 0, len(chunk))
+	flush := func() error {
+		if len(forward) == 0 {
+			return nil
+		}
+		c.mu.Lock()
+		paneID := c.focusedID
+		c.mu.Unlock()
+		if paneID != "" {
+			f, err := protocol.NewFrame(protocol.FrameInput, protocol.Input{PaneID: paneID, Bytes: append([]byte(nil), forward...)})
+			if err != nil {
+				return err
+			}
+			if err := c.t.Send(f); err != nil {
+				return err
+			}
+		}
+		forward = forward[:0]
+		return nil
+	}
+	for _, b := range chunk {
+		switch b {
+		case clientKeyCtrlBracket:
+			if err := flush(); err != nil {
+				return false, err
+			}
+			return true, c.sendDetach()
+		case clientKeyCtrlK:
+			if err := flush(); err != nil {
+				return false, err
+			}
+			c.mu.Lock()
+			c.palette = &clientCommandPrompt{}
+			c.mu.Unlock()
+			c.drawPrompt()
+		case 0x17: // Ctrl-W: previous focus
+			if err := flush(); err != nil {
+				return false, err
+			}
+			_ = c.focusRelative(-1)
+		case 0x13: // Ctrl-S: next focus
+			if err := flush(); err != nil {
+				return false, err
+			}
+			_ = c.focusRelative(1)
+		default:
+			forward = append(forward, b)
+		}
+	}
+	return false, flush()
+}
+
+func (c *netClient) processPaletteInput(p *clientCommandPrompt, chunk []byte) (bool, error) {
+	for _, b := range chunk {
+		switch b {
+		case 0x1b: // ESC
+			c.mu.Lock()
+			c.palette = nil
+			c.mu.Unlock()
+			c.drawChrome()
+			return false, nil
+		case 'd':
+			if len(p.buf) == 0 {
+				c.mu.Lock()
+				c.palette = nil
+				c.mu.Unlock()
+				return true, c.sendDetach()
+			}
+			p.buf = append(p.buf, b)
+		case '\r', '\n':
+			command := strings.TrimSpace(string(p.buf))
+			c.mu.Lock()
+			c.palette = nil
+			c.mu.Unlock()
+			if command == "" {
+				c.drawChrome()
+				return false, nil
+			}
+			return false, c.sendSpawnCommand(command)
+		case 0x7f, 0x08:
+			if len(p.buf) > 0 {
+				p.buf = p.buf[:len(p.buf)-1]
+			}
+			c.drawPrompt()
+		default:
+			if b >= 0x20 {
+				p.buf = append(p.buf, b)
+				c.drawPrompt()
+			}
+		}
+	}
+	return false, nil
+}
+
+func (c *netClient) sendDetach() error {
+	f, err := protocol.NewFrame(protocol.FrameDetach, protocol.Detach{})
+	if err != nil {
+		return err
+	}
+	return c.t.Send(f)
+}
+
+func (c *netClient) sendSpawnCommand(command string) error {
+	data, err := json.Marshal(map[string]any{
+		"argv":  []string{command},
+		"name":  command,
+		"shell": true,
+	})
+	if err != nil {
+		return err
+	}
+	f, err := protocol.NewFrame(protocol.FramePaletteCommand, protocol.PaletteCommand{
+		Kind: "spawn_command",
+		Data: data,
+	})
+	if err != nil {
+		return err
+	}
+	return c.t.Send(f)
+}
+
+func (c *netClient) focusRelative(delta int) error {
+	c.mu.Lock()
+	model := c.chrome
+	current := c.focusedID
+	c.mu.Unlock()
+	ids := make([]string, 0, len(model.Processes)+len(model.AgentTree)+len(model.Tabs))
+	for _, n := range model.Sidebar {
+		if n.ChildID != "" {
+			ids = append(ids, n.ChildID)
+		}
+	}
+	if len(ids) == 0 {
+		for _, p := range model.Processes {
+			ids = append(ids, p.ID)
+		}
+		for _, p := range model.Tabs {
+			ids = append(ids, p.ID)
+		}
+	}
+	if len(ids) == 0 {
+		return nil
+	}
+	idx := 0
+	for i, id := range ids {
+		if id == current {
+			idx = i
+			break
+		}
+	}
+	idx = (idx + delta + len(ids)) % len(ids)
+	f, err := protocol.NewFrame(protocol.FrameFocus, protocol.Focus{PaneID: ids[idx]})
+	if err != nil {
+		return err
+	}
+	return c.t.Send(f)
+}
+
+func (c *netClient) resize(cols, rows uint16) error {
+	c.mu.Lock()
+	c.layout = newTerminalLayout(cols, rows)
+	if c.renderer != nil {
+		c.renderer.SetLayout(c.layout)
+	}
+	size := protocol.Size{Cols: c.layout.childCols(), Rows: c.layout.childRows()}
+	c.mu.Unlock()
+	f, err := protocol.NewFrame(protocol.FrameResize, protocol.Resize{Size: size})
+	if err != nil {
+		return err
+	}
+	return c.t.Send(f)
+}
+
+func (c *netClient) enterScreen() {
+	_, _ = c.out.Write([]byte("\x1b[?1049h\x1b[H\x1b[2J\x1b[?25h\x1b[?1000h\x1b[?1006h"))
+	c.installScrollRegion()
+}
+
+func (c *netClient) leaveScreen() {
+	_, _ = c.out.Write([]byte("\x1b[r\x1b[?6l\x1b[?1006l\x1b[?1000l\x1b[?25h\x1b[?1049l"))
+}
+
+func (c *netClient) installScrollRegion() {
+	mainBottom := int(c.layout.statusRow) - statusRows
+	if mainBottom < int(c.layout.mainTop) {
+		return
+	}
+	fmt.Fprintf(c.out, "\x1b[?6l\x1b[%d;%dr\x1b[%d;%dH",
+		int(c.layout.mainTop), mainBottom,
+		int(c.layout.mainTop), int(c.layout.mainLeft))
+}
+
+func (c *netClient) clearViewport() {
+	for row := int(c.layout.mainTop); row < int(c.layout.statusRow); row++ {
+		fmt.Fprintf(c.out, "\x1b[%d;%dH\x1b[%dX", row, int(c.layout.mainLeft), int(c.layout.childCols()))
+	}
+	fmt.Fprintf(c.out, "\x1b[%d;%dH", int(c.layout.mainTop), int(c.layout.mainLeft))
+}
+
+func (c *netClient) writeWrapped(out []byte) {
+	if len(out) == 0 {
+		return
+	}
+	wrapped := make([]byte, 0, len(out)+10)
+	wrapped = append(wrapped, "\x1b[?7l"...)
+	wrapped = append(wrapped, out...)
+	wrapped = append(wrapped, "\x1b[?7h"...)
+	_, _ = c.out.Write(wrapped)
+}
+
+func (c *netClient) drawChrome() {
+	c.mu.Lock()
+	model := c.chrome
+	prompt := c.palette
+	c.mu.Unlock()
+	var b strings.Builder
+	width := int(c.layout.childCols())
+	fmt.Fprintf(&b, "\x1b[1;1H\x1b[%dX\x1b[2;1H\x1b[%dX\x1b[3;1H\x1b[%dX", width, width, width)
+	if len(model.Tabs) == 0 {
+		fmt.Fprintf(&b, "\x1b[1;2H%s+ new%s", styleDim, styleReset)
+	} else {
+		col := 1
+		for _, tab := range model.Tabs {
+			label := fitName(tab.Name, 18)
+			style := styleHint
+			if tab.ID == model.ActiveAgentID || tab.ID == model.FocusedID {
+				style = styleActive
+			}
+			fmt.Fprintf(&b, "\x1b[1;%dH%s %s %s", col, style, label, styleReset)
+			col += visibleLen(label) + 3
+			if col >= width {
+				break
+			}
+		}
+	}
+	fmt.Fprintf(&b, "\x1b[3;1H%s%s%s", styleBorder, strings.Repeat("─", width), styleReset)
+	if c.layout.sidebarVisible {
+		c.appendSidebar(&b, model)
+	}
+	status := "Ctrl-K command palette  ·  Ctrl-] detach"
+	if model.FocusedID != "" {
+		status = fmt.Sprintf("%s · %s", model.FocusedID, status)
+	}
+	if prompt != nil {
+		status = "command: " + string(prompt.buf)
+	}
+	fmt.Fprintf(&b, "\x1b[%d;1H\x1b[7m%s%s", int(c.layout.statusRow), fitName(status, int(c.layout.hostCols)), styleReset)
+	_, _ = c.out.Write([]byte(b.String()))
+}
+
+func (c *netClient) appendSidebar(b *strings.Builder, model chromeModel) {
+	border := int(c.layout.sidebarLeft) - 1
+	for row := 1; row <= int(c.layout.statusRow)-1; row++ {
+		fmt.Fprintf(b, "\x1b[%d;%dH%s│%s", row, border, styleBorder, styleReset)
+	}
+	col := int(c.layout.sidebarLeft)
+	row := 1
+	write := func(text string) {
+		if row >= int(c.layout.statusRow) {
+			return
+		}
+		fmt.Fprintf(b, "\x1b[%d;%dH%-*s", row, col, int(c.layout.sidebarWidth)-1, fitName(text, int(c.layout.sidebarWidth)-1))
+		row++
+	}
+	write(styleActive + "Processes" + styleReset)
+	for _, p := range model.Processes {
+		prefix := "  "
+		if p.ID == model.FocusedID {
+			prefix = "▎ "
+		}
+		write(prefix + p.Name)
+	}
+	row++
+	write(styleActive + "Agent Tree" + styleReset)
+	for _, p := range model.AgentTree {
+		prefix := "  "
+		if p.ID == model.FocusedID {
+			prefix = "▎ "
+		}
+		write(prefix + p.Name)
+	}
+	row++
+	write(styleActive + "Scratchpads" + styleReset)
+	for _, p := range model.Scratchpads {
+		write("  " + p.Name)
+	}
+}
+
+func (c *netClient) drawPrompt() {
+	c.drawChrome()
+}
+
+func clientHostSize(r io.Reader) (cols, rows uint16) {
+	if f, ok := r.(*os.File); ok {
+		ws, err := cpty.GetsizeFull(f)
+		if err == nil && ws.Cols > 0 && ws.Rows > 0 {
+			return ws.Cols, ws.Rows
+		}
+	}
+	return 120, 40
+}

internal/app/client_net_test.go

@@ -0,0 +1,157 @@
+package app
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"io"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/hjbdev/patterm/internal/protocol"
+)
+
+func TestNetClientFrameLoopSendsFocusedInput(t *testing.T) {
+	clientT, daemonT := protocol.NewLoopbackPair()
+	inR, inW := ioPipe(t)
+	out := &lockedBuffer{}
+
+	gotInput := make(chan protocol.Input, 1)
+	errCh := make(chan error, 1)
+	go func() {
+		f, err := daemonT.Recv()
+		if err != nil {
+			errCh <- err
+			return
+		}
+		if f.Type != protocol.FrameAttach {
+			t.Errorf("first frame = %s, want attach", f.Type)
+			errCh <- nil
+			return
+		}
+		sendTestFrame(t, daemonT, protocol.FrameHello, protocol.Hello{Version: 1, ClientID: "test", ProjectKey: "project"})
+		sendTestFrame(t, daemonT, protocol.FrameProjectList, protocol.ProjectList{})
+		model := chromeModel{
+			ProjectKey: "project",
+			FocusedID:  "p1",
+			Processes:  []childModel{{ID: "p1", Name: "shell", Kind: string(KindCommand), Status: string(StatusRunning)}},
+			Sidebar:    []navEntryModel{{ChildID: "p1"}},
+		}
+		sendTestFrame(t, daemonT, protocol.FrameChrome, protocol.Chrome{ProjectKey: "project", Model: mustMarshalTest(t, model)})
+		sendTestFrame(t, daemonT, protocol.FramePaneSnapshot, protocol.PaneSnapshot{PaneID: "p1", Bytes: []byte("READY")})
+		for {
+			f, err := daemonT.Recv()
+			if err != nil {
+				errCh <- err
+				return
+			}
+			if f.Type != protocol.FrameInput {
+				continue
+			}
+			input, err := protocol.Decode[protocol.Input](f)
+			if err != nil {
+				errCh <- err
+				return
+			}
+			gotInput <- input
+			_ = daemonT.Close()
+			errCh <- nil
+			return
+		}
+	}()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	runCh := make(chan error, 1)
+	go func() {
+		runCh <- RunAttachedClient(ctx, ClientOptions{
+			Transport: clientT,
+			Stdin:     inR,
+			Stdout:    out,
+			Cols:      80,
+			Rows:      24,
+		})
+	}()
+
+	deadline := time.Now().Add(3 * time.Second)
+	for time.Now().Before(deadline) && !bytes.Contains(out.Bytes(), []byte("READY")) {
+		time.Sleep(10 * time.Millisecond)
+	}
+	if !bytes.Contains(out.Bytes(), []byte("READY")) {
+		t.Fatalf("snapshot was not rendered before input; output=%q", out.String())
+	}
+	if _, err := inW.Write([]byte("echo hi\r")); err != nil {
+		t.Fatalf("write stdin: %v", err)
+	}
+	select {
+	case input := <-gotInput:
+		if input.PaneID != "p1" || string(input.Bytes) != "echo hi\r" {
+			t.Fatalf("input = %#v", input)
+		}
+	case <-time.After(3 * time.Second):
+		t.Fatalf("client did not forward input")
+	}
+	cancel()
+	_ = inW.Close()
+	select {
+	case err := <-runCh:
+		if err != nil {
+			t.Fatalf("client run: %v", err)
+		}
+	case <-time.After(3 * time.Second):
+		t.Fatalf("client did not stop")
+	}
+	if err := <-errCh; err != nil && err != protocol.ErrTransportClosed {
+		t.Fatalf("daemon side: %v", err)
+	}
+}
+
+type lockedBuffer struct {
+	mu sync.Mutex
+	b  bytes.Buffer
+}
+
+func (b *lockedBuffer) Write(p []byte) (int, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	return b.b.Write(p)
+}
+
+func (b *lockedBuffer) Bytes() []byte {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	return append([]byte(nil), b.b.Bytes()...)
+}
+
+func (b *lockedBuffer) String() string {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	return b.b.String()
+}
+
+func ioPipe(t *testing.T) (*io.PipeReader, *io.PipeWriter) {
+	t.Helper()
+	r, w := io.Pipe()
+	return r, w
+}
+
+func sendTestFrame[T any](t *testing.T, tr protocol.Transport, typ protocol.FrameType, payload T) {
+	t.Helper()
+	f, err := protocol.NewFrame(typ, payload)
+	if err != nil {
+		t.Fatalf("frame %s: %v", typ, err)
+	}
+	if err := tr.Send(f); err != nil {
+		t.Fatalf("send %s: %v", typ, err)
+	}
+}
+
+func mustMarshalTest(t *testing.T, v any) []byte {
+	t.Helper()
+	b, err := json.Marshal(v)
+	if err != nil {
+		t.Fatalf("marshal: %v", err)
+	}
+	return b
+}

internal/harness/restart_persist_test.go

@@ -143,7 +143,7 @@ func openSession(t *testing.T, env *testEnv, childEnv []string) *Session {
 	if err != nil {
 		t.Fatalf("vt emulator: %v", err)
 	}
-	p, err := pkgpty.Start([]string{env.PattermBin, "--project", env.ProjectDir}, childEnv, "", env.Cols, env.Rows)
+	p, err := pkgpty.Start([]string{env.PattermBin, "--in-process", "--project", env.ProjectDir}, childEnv, "", env.Cols, env.Rows)
 	if err != nil {
 		_ = em.Close()
 		t.Fatalf("pty start: %v", err)

internal/harness/session.go

@@ -55,7 +55,7 @@ func NewCLI(opts Options) (*Session, error) {
 	if err != nil {
 		return nil, err
 	}
-	p, err := pkgpty.Start([]string{env.PattermBin, "--project", env.ProjectDir}, childEnv, "", env.Cols, env.Rows)
+	p, err := pkgpty.Start([]string{env.PattermBin, "--in-process", "--project", env.ProjectDir}, childEnv, "", env.Cols, env.Rows)
 	if err != nil {
 		_ = em.Close()
 		return nil, err