sshchat: Replace terminal echo hack with our forked terminal

go.mod

@@ -6,5 +6,5 @@ require (
 	github.com/jessevdk/go-flags v1.4.0
 	github.com/shazow/rateio v0.0.0-20150116013248-e8e00881e5c1
 	golang.org/x/crypto v0.0.0-20190313024323-a1f597ede03a
-	golang.org/x/sys v0.0.0-20190312061237-fead79001313 // indirect
+	golang.org/x/sys v0.0.0-20190312061237-fead79001313
 )

host.go

@@ -146,14 +146,6 @@ func (h *Host) Connect(term *sshd.Terminal) {
 			break
 		}
 
-		// Gross hack to override line echo in golang.org/x/crypto/ssh/terminal
-		// It needs to live before we render any responses.
-		term.Write([]byte{
-			27, '[', 'A', // Up
-			27, '[', '2', 'K', // Clear line
-		})
-		// May the gods have mercy on our souls.
-
 		err = ratelimit.Count(1)
 		if err != nil {
 			user.Send(message.NewSystemMsg("Message rejected: Rate limiting is in effect.", user))

sshd/terminal.go

@@ -7,8 +7,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/shazow/ssh-chat/sshd/terminal"
 	"golang.org/x/crypto/ssh"
-	"golang.org/x/crypto/ssh/terminal"
 )
 
 var keepaliveInterval = time.Second * 30
@@ -81,6 +81,7 @@ func NewTerminal(conn *ssh.ServerConn, ch ssh.NewChannel) (*Terminal, error) {
 
 		done: make(chan struct{}),
 	}
+	term.Terminal.ClearLine = true
 
 	go term.listen(requests)