diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..051d09d
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+eval "$(lorri direnv)"
diff --git a/go.mod b/go.mod
index 237d372..6fdd8b4 100644
--- a/go.mod
+++ b/go.mod
@@ -8,7 +8,8 @@ require (
 	github.com/eaburns/peggy v1.0.1
 	github.com/facebookgo/flagenv v0.0.0-20160425205200-fcd59fca7456
 	github.com/perlin-network/life v0.0.0-20191010061010-fa85cafea8ac
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/rs/cors v1.7.0
-	within.website/ln v0.7.0
+	within.website/ln v0.9.1
 	within.website/x v1.1.8
 )
diff --git a/go.sum b/go.sum
index d90aba5..bd9b783 100644
--- a/go.sum
+++ b/go.sum
@@ -83,6 +83,8 @@ github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2/go.mod h1:iIss55rK
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rs/cors v1.6.0/go.mod h1:gFx+x8UowdsKA9AchylcLynDq+nNFfI8FkUZdN/jGCU=
 github.com/rs/cors v1.7.0 h1:+88SsELBHx5r+hZ8TCkggzSstaWNbDvThkVK8H6f9ik=
@@ -153,5 +155,7 @@ within.website/johaus v1.1.0/go.mod h1:0RBs2TucQ3CZQiVoqNj9Wch7mtZY05uvNO14v0lKc
 within.website/ln v0.6.0/go.mod h1:ifURKqsCJekcsdUE+hyCdcuhQqQ+9v9DfA++ZqYxZFE=
 within.website/ln v0.7.0 h1:cZUc53cZF/+hWuEAv1VbqlYJ5czuPFHKfH0hLKmlIUA=
 within.website/ln v0.7.0/go.mod h1:ifURKqsCJekcsdUE+hyCdcuhQqQ+9v9DfA++ZqYxZFE=
+within.website/ln v0.9.1 h1:Qi8IjeCnU43jXijKtr5qtcbjuiCVAudOIxqTim7svnc=
+within.website/ln v0.9.1/go.mod h1:I+Apk8qxMStNXTZdyDMqDqe6CB8Hn6+W/Gyf5QbY+2E=
 within.website/x v1.1.8 h1:OSiR9OQo+nRf17tiZV559bgKFB7x6xfcjPj9vVcJxVo=
 within.website/x v1.1.8/go.mod h1:L6lqE0SSvN7RMnVFMuKsArOEzuRkT1R2HKYJgu/un7Q=
diff --git a/http.go b/http.go
index 9977087..f096e3f 100644
--- a/http.go
+++ b/http.go
@@ -5,7 +5,9 @@ import (
 	"flag"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"net/http"
+	"os"
 
 	"github.com/rs/cors"
 	"within.website/ln/ex"
@@ -22,7 +24,24 @@ func doHTTP() error {
 	http.Handle("/play", doTemplate(playgroundTemplate))
 	http.HandleFunc("/api/playground", runPlayground)
 
-	return http.ListenAndServe(":"+*port, ex.HTTPLog(cors.Default().Handler(http.DefaultServeMux)))
+	srv := &http.Server{
+		Addr:    ":" + *port,
+		Handler: ex.HTTPLog(cors.Default().Handler(http.DefaultServeMux)),
+	}
+
+	if *sockpath != "" {
+		os.RemoveAll(*sockpath)
+
+		l, err := net.Listen("unix", *sockpath)
+		if err != nil {
+			return fmt.Errorf("can't listen on %s: %v", *sockpath, err)
+		}
+		defer l.Close()
+
+		return srv.Serve(l)
+	} else {
+		return srv.ListenAndServe()
+	}
 }
 
 func httpError(w http.ResponseWriter, err error, code int) {
diff --git a/main.go b/main.go
index 9a22a2a..cc6808a 100644
--- a/main.go
+++ b/main.go
@@ -17,6 +17,7 @@ var (
 	outFname     = flag.String("o", "", "if specified, write the webassembly binary created by -p here")
 	watFname     = flag.String("o-wat", "", "if specified, write the uncompiled webassembly created by -p here")
 	port         = flag.String("port", "", "HTTP port to listen on")
+	sockpath     = flag.String("sockpath", "", "Unix domain socket to listen on")
 	writeTao     = flag.Bool("koan", false, "if true, print the h koan and then exit")
 	writeVersion = flag.Bool("v", false, "if true, print the version of h and then exit")
 )
@@ -100,7 +101,7 @@ func main() {
 		return
 	}
 
-	if *port != "" {
+	if *port != "" || *sockpath != "" {
 		err := doHTTP()
 		if err != nil {
 			panic(err)
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..1550d66
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,13 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    go
+    goimports
+    gopls
+    wabt
+
+    # keep this line if you use bash
+    bashInteractive
+  ];
+}