/*
   SysUtils - a library to assist with various system-related functions
   Copyright (C) 2020  Brent Saner

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

package terminal

import (
	"os"
)

// IsShell returns true if the program is running inside an interactive shell (interactive invocation, sudo, etc.), and false if not (cron, ssh exec, pipe, etc.).
// Thanks to https://rosettacode.org/wiki/Check_output_device_is_a_terminal#Go
func IsShell() (interactive bool) {

	var stdoutStat os.FileInfo

	stdoutStat, _ = os.Stdout.Stat()

	if (stdoutStat.Mode() & os.ModeCharDevice) != 0 {
		interactive = true
	}

	return
}