Refine API of webtty package

webtty/slave.go

@@ -6,8 +6,12 @@ import (
 
 // Slave represents a PTY slave, typically it's a local command.
 type Slave interface {
-	io.ReadWriteCloser
+	io.ReadWriter
 
+	// WindowTitleVariables returns any values that can be used to fill out
+	// the title of a terminal.
 	WindowTitleVariables() map[string]interface{}
+
+	// ResizeTerminal sets a new size of the terminal.
 	ResizeTerminal(columns int, rows int) error
 }