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@ -6,16 +6,19 @@ package gocui
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import (
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standardErrors "errors"
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"os"
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"os/signal"
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"runtime"
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"strings"
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"syscall"
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"time"
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"unsafe"
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"github.com/go-errors/errors"
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"github.com/jesseduffield/termbox-go"
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)
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// this comment is here for no good reason (or is it) (I think it is)
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var (
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// ErrQuit is used to decide if the MainLoop finished successfully.
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ErrQuit = standardErrors.New("quit")
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@ -95,12 +98,21 @@ type Gui struct {
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// NewGui returns a new Gui object with a given output mode.
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func NewGui(mode OutputMode, supportOverlaps bool) (*Gui, error) {
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g := &Gui{}
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if runtime.GOOS != "windows" {
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var err error
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if g.maxX, g.maxY, err = g.getTermWindowSize(); err != nil {
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return nil, err
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}
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} else {
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g.maxX, g.maxY = termbox.Size()
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}
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if err := termbox.Init(); err != nil {
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return nil, err
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}
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g := &Gui{}
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g.outputMode = mode
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termbox.SetOutputMode(termbox.OutputMode(mode))
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@ -109,8 +121,6 @@ func NewGui(mode OutputMode, supportOverlaps bool) (*Gui, error) {
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g.tbEvents = make(chan termbox.Event, 20)
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g.userEvents = make(chan userEvent, 20)
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g.maxX, g.maxY = termbox.Size()
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g.BgColor, g.FgColor = ColorDefault, ColorDefault
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g.SelBgColor, g.SelFgColor = ColorDefault, ColorDefault
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@ -848,3 +858,52 @@ func (g *Gui) loaderTick() {
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}
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}()
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}
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type windowSize struct {
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rows uint16
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cols uint16
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xpixels uint16
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ypixels uint16
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}
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// getTermWindowSize is get terminal window size on linux or unix.
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// When gocui run inside the docker contaienr need to check and get the window size.
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func (g *Gui) getTermWindowSize() (int, int, error) {
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out, err := os.OpenFile("/dev/tty", os.O_RDWR, 0)
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if err != nil {
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return 0, 0, err
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}
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defer out.Close()
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signalCh := make(chan os.Signal, 1)
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signal.Notify(signalCh, syscall.SIGWINCH, syscall.SIGINT)
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defer signal.Stop(signalCh)
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var sz windowSize
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for {
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_, _, err = syscall.Syscall(
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syscall.SYS_IOCTL,
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out.Fd(),
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uintptr(syscall.TIOCGWINSZ),
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uintptr(unsafe.Pointer(&sz)),
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)
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// check terminal window size
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if sz.cols > 0 && sz.rows > 0 {
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return int(sz.cols), int(sz.rows), nil
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}
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select {
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case signal := <-signalCh:
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switch signal {
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// when the terminal window size is changed
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case syscall.SIGWINCH:
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continue
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// ctrl + c to cancel
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case syscall.SIGINT:
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return 0, 0, errors.New("There was not enough window space to start the application")
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}
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}
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}
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}
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Jesse Duffield
5 years ago