add debug logging flag

main.go

@@ -4,6 +4,7 @@ import (
 	"crypto/tls"
 	"flag"
 	"fmt"
+	"log"
 	"net"
 	"os"
 
@@ -23,6 +24,9 @@ func main() {
 	passwordPrompt := flag.Bool("password-prompt", false, "prompt for server password on stdin")
 	insecure := flag.Bool("insecure", false, "skip server certificate verification")
 	certificate := flag.String("certificate", "", "PEM encoded certificate and private key")
+	debug := flag.Bool("debug", false, "enable debug logging to stderr")
+	treeWidth := flag.Int("tree-width", 20, "width of the channel tree pane")
+	logFile := flag.String("log", "", "write chat messages to file")
 
 	flag.Parse()
 
@@ -56,6 +60,21 @@ func main() {
 
 	b.Config.Username = *username
 	b.Config.Password = pass
+	b.TreeWidth = *treeWidth
+	b.Debug = *debug
+	if b.Debug {
+		b.Logger = log.New(os.Stderr, "barnard: ", log.Ltime)
+		b.debugf("connecting to %s as %q", addr, *username)
+	}
+	if *logFile != "" {
+		f, err := os.OpenFile(*logFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0600)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%s\n", err)
+			os.Exit(1)
+		}
+		defer f.Close()
+		b.LogFile = f
+	}
 
 	if *insecure {
 		b.TLSConfig.InsecureSkipVerify = true