Improve isatty() Windows implementation with Cygwin/Mingw pseudo terminals

[hboutemy]

as seen in Jansi issue fusesource/jansi#94, Cygwin and Mingw use pseudo terminals, not real terminals
Then isatty() does not detect the pseudo-terminal
Git has a workaround: git/git@8692483

        /* get pipe name */
 	if (!NT_SUCCESS(NtQueryObject(h, ObjectNameInformation,
 			buffer, sizeof(buffer) - 2, &result)))
 		return;
 	name = nameinfo->Name.Buffer;
 	name[nameinfo->Name.Length] = 0;
 
	/*
	 * Check if this could be a MSYS2 pty pipe ('msys-XXXX-ptyN-XX')
	 * or a cygwin pty pipe ('cygwin-XXXX-ptyN-XX')
	 */
	if ((!wcsstr(name, L"msys-") && !wcsstr(name, L"cygwin-")) ||
			!wcsstr(name, L"-pty"))
		return;

This code should be added to Jansi native isatty() implementation for Windows to properly detect (pseudo)terminal with Cygwin and Mingw

[gnodet]

The code builds, but it does not seem to give the expected results.
When I execute the CLibrary.isatty(0) or CLibrary.isatty(1) under cygwin, both returns 0.

[hboutemy]

did you try to get the value of the terminal name?
this is really the current code in git: https://github.com/git/git/blob/master/compat/winansi.c#L537