istty

func CheckTTY ¶

func CheckTTY(v interface{}) TTYState

isTTY tries to only return true if the input is actually a terminal.

os.ModeCharDevice isn't quite enough. I tested various OS/shell combos, using the following code:

fi, _ := os.Stdin.Stat()
fmt.Println(fi.Mode())

Results:

                TTY in       Pipe in      TTY out      Pipe out
macOS/bash      Dcrw--w----  -prw-rw----  Dcrw--w----  -prw-rw----
macOS/zsh       Dcrw--w----  -prw-rw----  Dcrw--w----  -prw-rw----
linux/bash      Dcrw--w----  -prw-------  Dcrw--w----  -prw-------
linux/zsh       Dcrw--w----  -prw-------  Dcrw--w----  -prw-------
linux/fish      Dcrw--w----  -prw-------  Dcrw--w----  -prw-------
win/cmd.exe     Dcrw-rw-rw-  --rw-rw-rw-  Dcrw-rw-rw-  --rw-rw-rw-
win/powershell  Dcrw-rw-rw-  --rw-rw-rw-  Dcrw-rw-rw-  --rw-rw-rw-
win/gitbash     -prw-rw-rw-  -prw-rw-rw-  -prw-rw-rw-  -prw-rw-rw-
win/cygwin      -prw-rw-rw-  -prw-rw-rw-  -prw-rw-rw-  -prw-rw-rw-

More info:

• https://rosettacode.org/wiki/Check_output_device_is_a_terminal
• https://github.com/golang/crypto/blob/master/ssh/terminal/util.go#L29
• https://github.com/k-takata/go-iscygpty