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// Copyright 2014 The gocui Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !windows
package gocui
import (
"os"
"os/signal"
"syscall"
"unsafe"
"github.com/go-errors/errors"
)
// getTermWindowSize is get terminal window size on linux or unix.
// When gocui run inside the docker contaienr need to check and get the window size.
func (g *Gui) getTermWindowSize() (int, int, error) {
var sz struct {
rows uint16
cols uint16
_ [2]uint16 // to match underlying syscall; see https://github.com/awesome-gocui/gocui/issues/33
}
var termw, termh int
out, err := os.OpenFile("/dev/tty", os.O_RDWR, 0)
if err != nil {
return 0, 0, err
}
defer out.Close()
signalCh := make(chan os.Signal, 1)
signal.Notify(signalCh, syscall.SIGWINCH, syscall.SIGINT)
for {
_, _, _ = syscall.Syscall(syscall.SYS_IOCTL,
out.Fd(), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&sz)))
// check terminal window size
termw, termh = int(sz.cols), int(sz.rows)
if termw > 0 && termh > 0 {
return termw, termh, nil
}
select {
case signal := <-signalCh:
switch signal {
// when the terminal window size is changed
case syscall.SIGWINCH:
continue
// ctrl + c to cancel
case syscall.SIGINT:
return 0, 0, errors.New("stop to get term window size")
}
}
}
}
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