Detect when we're connected to a TTY

[dimo414]

Original report by Michael Diamond (Bitbucket: dimo414).

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https://github.com/jnr/jnr-posix looks like a promising option; Java doesn't look to have anything reasonable out of the box.

[dimo414]

Original comment by Michael Diamond (Bitbucket: dimo414).

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Could also try to support column and line counts, like Python's shutil.get_terminal_width() does; see https://hg.python.org/cpython/file/3.5/Modules/posixmodule.c#l11128 for the Unix implementation.

[dimo414]

Original comment by Michael Diamond (Bitbucket: dimo414).

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See also TerminalLineSettings which calls stty -a < /dev/tty to get information about the current tty.

[dimo414]

Original comment by Michael Diamond (Bitbucket: dimo414).

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Possible partial solutions include those listed on tldp ($PS1 is set, $- contains i, or perhaps starting a subprocess to call test -t {0,1,2}). On Ubuntu the file descriptors in /dev/fd/are symlinks to /dev/pts/N (and perhaps /dev/ttyN` if attached to a native terminal device?) so checking those symlinks might also be an option.