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tty.go
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tty.go
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/*
Go tty -- print the name of the terminal connected to standard input
Copyright (C) 2015 Eric Lagergren
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 <http://www.gnu.org/licenses/>.
*/
package main
import (
"fmt"
"os"
"github.com/EricLagergren/go-gnulib/ttyname"
flag "github.com/ogier/pflag"
)
const (
VERSION = `tty (Go coreutils) 1.0
Copyright (C) 2015 Eric Lagergren
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Eric Lagergren
Inspired by David MacKenzie.`
HELP = `Usage: tty [OPTION]...
Print the file name of the terminal connected to standard input.
-s, --silent, --quiet print nothing, only return an exit status
--help display this help and exit
--version output version information and exit
Report uname bugs to ericscottlagergren@gmail.com
Go coreutils home page: <https://www.github.com/EricLagergren/go-coreutils/>`
)
var (
version = flag.Bool("version", false, "print version")
quiet1 = flag.BoolP("silent", "s", false, "no output")
quiet2 = flag.Bool("quiet", false, "no output")
)
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "%s\n", HELP)
return
}
flag.Parse()
if *version {
fmt.Printf("%s\n", VERSION)
return
}
silent := *quiet1 || *quiet2
si := os.Stdin.Fd()
tty, err := ttyname.TtyName(si)
if !silent {
if err == ttyname.NotTty {
fmt.Println("not a tty")
os.Exit(1)
}
if tty != "" {
fmt.Println(tty)
return
} else {
fmt.Println("tty")
}
}
if err != nil {
os.Exit(1)
}
}