add local daemon socket protocol

cmd/patterm/main.go

@@ -14,7 +14,9 @@ package main
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
+	"net"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -27,6 +29,7 @@ import (
 	"github.com/hjbdev/patterm/internal/app"
 	"github.com/hjbdev/patterm/internal/mcp"
 	"github.com/hjbdev/patterm/internal/projectkey"
+	"github.com/hjbdev/patterm/internal/protocol"
 )
 
 // version is overridden at build time via `-ldflags "-X main.version=..."`.
@@ -48,6 +51,15 @@ func main() {
 		runDebugHarness()
 		return
 	}
+	if len(os.Args) >= 2 && os.Args[1] == "daemon" {
+		os.Args = append(os.Args[:1], os.Args[2:]...)
+		runDaemonCommand()
+		return
+	}
+	if len(os.Args) >= 2 && os.Args[1] == "ls" {
+		runDaemonList()
+		return
+	}
 
 	var (
 		projectDir  = flag.String("project", "", "project directory (default $PWD)")
@@ -194,6 +206,78 @@ func runMCPProxy() {
 	}
 }
 
+func runDaemonCommand() {
+	if len(os.Args) >= 2 && os.Args[1] == "stop" {
+		runDaemonStop()
+		return
+	}
+	if len(os.Args) >= 2 && os.Args[1] == "ls" {
+		runDaemonList()
+		return
+	}
+	var projectDir = flag.String("project", "", "initial project directory (default $PWD)")
+	flag.Parse()
+	cwd, err := os.Getwd()
+	if err != nil {
+		die("getwd: %v", err)
+	}
+	if *projectDir != "" {
+		cwd = *projectDir
+	}
+	if err := app.RunDaemon(context.Background(), app.DaemonOptions{ProjectDir: cwd}); err != nil {
+		die("daemon: %v", err)
+	}
+}
+
+func runDaemonList() {
+	projects, err := daemonRequest(protocol.Frame{Type: protocol.FrameList})
+	if err != nil {
+		die("ls: %v", err)
+	}
+	for _, p := range projects.Projects {
+		fmt.Printf("%s\t%d\t%s\n", p.Key, p.TabCount, p.Path)
+	}
+}
+
+func runDaemonStop() {
+	if _, err := daemonRequest(protocol.Frame{Type: protocol.FrameStop}); err != nil {
+		die("daemon stop: %v", err)
+	}
+	fmt.Println("stopped")
+}
+
+func daemonRequest(req protocol.Frame) (protocol.ProjectList, error) {
+	socket, _, err := app.RuntimeDaemonPaths()
+	if err != nil {
+		return protocol.ProjectList{}, err
+	}
+	conn, err := net.Dial("unix", socket)
+	if err != nil {
+		return protocol.ProjectList{}, err
+	}
+	defer conn.Close()
+	t := protocol.NewConnTransport(conn)
+	if err := t.Send(req); err != nil {
+		return protocol.ProjectList{}, err
+	}
+	resp, err := t.Recv()
+	if err != nil {
+		return protocol.ProjectList{}, err
+	}
+	if resp.Type == protocol.FrameError {
+		var msg protocol.Error
+		_ = json.Unmarshal(resp.Payload, &msg)
+		if msg.Message == "" {
+			msg.Message = "daemon returned an error"
+		}
+		return protocol.ProjectList{}, fmt.Errorf("%s", msg.Message)
+	}
+	if resp.Type != protocol.FrameProjectList {
+		return protocol.ProjectList{}, fmt.Errorf("unexpected daemon response %q", resp.Type)
+	}
+	return protocol.Decode[protocol.ProjectList](resp)
+}
+
 func versionString() string {
 	commit, date := "unknown", "unknown"
 	if info, ok := debug.ReadBuildInfo(); ok {