From e8b6a843f73cd359f9178cfb01341b2a12caff6d Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 12 Aug 2026 20:51:01 +0000
Subject: [PATCH 1/3] Initial plan


From 971794a3257224d3684616edc5adb78e3c7140b9 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 12 Aug 2026 20:53:32 +0000
Subject: [PATCH 2/3] Add auto-open browser functionality with -no-open flag

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>
---
 main.go | 35 +++++++++++++++++++++++++++++++++--
 1 file changed, 33 insertions(+), 2 deletions(-)

diff --git a/main.go b/main.go
index e4ae3f6..1925f05 100644
--- a/main.go
+++ b/main.go
@@ -3,13 +3,30 @@ package main
 import (
 	"flag"
 	"fmt"
+	"net"
 	"net/http"
 	"os"
+	"os/exec"
+	"runtime"
 )
 
+func openBrowser(url string) error {
+	var cmd *exec.Cmd
+	switch runtime.GOOS {
+	case "darwin":
+		cmd = exec.Command("open", url)
+	case "windows":
+		cmd = exec.Command("rundll32", "url.dll,FileProtocolHandler", url)
+	default:
+		cmd = exec.Command("xdg-open", url)
+	}
+	return cmd.Start()
+}
+
 func main() {
 	port := flag.String("p", "3844", "Port to listen on")
 	workspaceDir := flag.String("C", ".", "Directory to scan for git repositories")
+	noOpen := flag.Bool("no-open", false, "Disable auto-opening browser")
 	flag.Parse()
 
 	if err := os.Chdir(*workspaceDir); err != nil {
@@ -19,8 +36,22 @@ func main() {
 
 	http.HandleFunc("/", diffsHandler)
 
-	fmt.Printf("Starting server on http://localhost:%s\n", *port)
-	if err := http.ListenAndServe(":"+*port, nil); err != nil {
+	listener, err := net.Listen("tcp", ":"+*port)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Server failed: %v\n", err)
+		os.Exit(1)
+	}
+
+	url := fmt.Sprintf("http://localhost:%s", *port)
+	fmt.Printf("Starting server on %s\n", url)
+
+	if !*noOpen {
+		if err := openBrowser(url); err != nil {
+			fmt.Fprintf(os.Stderr, "Failed to open browser: %v\n", err)
+		}
+	}
+
+	if err := http.Serve(listener, nil); err != nil {
 		fmt.Fprintf(os.Stderr, "Server failed: %v\n", err)
 		os.Exit(1)
 	}

From d39b30b954fe3955f947010813cc4f7cdfae8813 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 12 Aug 2026 20:56:40 +0000
Subject: [PATCH 3/3] Use pkg/browser library and rename flag to -B

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>
---
 go.mod  |  5 +++++
 go.sum  |  4 ++++
 main.go | 23 +++++------------------
 3 files changed, 14 insertions(+), 18 deletions(-)
 create mode 100644 go.sum

diff --git a/go.mod b/go.mod
index d7f2731..536e447 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,8 @@
 module github.com/kitproj/diff-server
 
 go 1.24.4
+
+require (
+	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
+	golang.org/x/sys v0.1.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..7513caf
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,4 @@
+github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c h1:+mdjkGKdHQG3305AYmdv1U2eRNDiU2ErMBj1gwrq8eQ=
+github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c/go.mod h1:7rwL4CYBLnjLxUqIJNnCWiEdr3bn6IUYi15bNlnbCCU=
+golang.org/x/sys v0.1.0 h1:kunALQeHf1/185U1i0GOB/fy1IPRDDpuoOOqRReG57U=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
diff --git a/main.go b/main.go
index 1925f05..54d23fa 100644
--- a/main.go
+++ b/main.go
@@ -6,27 +6,14 @@ import (
 	"net"
 	"net/http"
 	"os"
-	"os/exec"
-	"runtime"
-)
 
-func openBrowser(url string) error {
-	var cmd *exec.Cmd
-	switch runtime.GOOS {
-	case "darwin":
-		cmd = exec.Command("open", url)
-	case "windows":
-		cmd = exec.Command("rundll32", "url.dll,FileProtocolHandler", url)
-	default:
-		cmd = exec.Command("xdg-open", url)
-	}
-	return cmd.Start()
-}
+	"github.com/pkg/browser"
+)
 
 func main() {
 	port := flag.String("p", "3844", "Port to listen on")
 	workspaceDir := flag.String("C", ".", "Directory to scan for git repositories")
-	noOpen := flag.Bool("no-open", false, "Disable auto-opening browser")
+	noBrowser := flag.Bool("B", false, "Disable auto-opening browser")
 	flag.Parse()
 
 	if err := os.Chdir(*workspaceDir); err != nil {
@@ -45,8 +32,8 @@ func main() {
 	url := fmt.Sprintf("http://localhost:%s", *port)
 	fmt.Printf("Starting server on %s\n", url)
 
-	if !*noOpen {
-		if err := openBrowser(url); err != nil {
+	if !*noBrowser {
+		if err := browser.OpenURL(url); err != nil {
 			fmt.Fprintf(os.Stderr, "Failed to open browser: %v\n", err)
 		}
 	}