switched to go-mod, updated codegangsta/cli -> urfave/cli

vendor/github.com/kr/pty/pty_darwin.go

@@ -1,60 +0,0 @@
-package pty
-
-import (
-	"errors"
-	"os"
-	"syscall"
-	"unsafe"
-)
-
-func open() (pty, tty *os.File, err error) {
-	p, err := os.OpenFile("/dev/ptmx", os.O_RDWR, 0)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	sname, err := ptsname(p)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	err = grantpt(p)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	err = unlockpt(p)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	t, err := os.OpenFile(sname, os.O_RDWR, 0)
-	if err != nil {
-		return nil, nil, err
-	}
-	return p, t, nil
-}
-
-func ptsname(f *os.File) (string, error) {
-	n := make([]byte, _IOC_PARM_LEN(syscall.TIOCPTYGNAME))
-
-	err := ioctl(f.Fd(), syscall.TIOCPTYGNAME, uintptr(unsafe.Pointer(&n[0])))
-	if err != nil {
-		return "", err
-	}
-
-	for i, c := range n {
-		if c == 0 {
-			return string(n[:i]), nil
-		}
-	}
-	return "", errors.New("TIOCPTYGNAME string not NUL-terminated")
-}
-
-func grantpt(f *os.File) error {
-	return ioctl(f.Fd(), syscall.TIOCPTYGRANT, 0)
-}
-
-func unlockpt(f *os.File) error {
-	return ioctl(f.Fd(), syscall.TIOCPTYUNLK, 0)
-}