func (s *StatusChart) lengthOfOutput() int {
ts, err := ttyutils.Winsize(os.Stdout)
if err != nil {
// This can happen when the output is redirected to a device
// that blows up on the ioctl Winsize uses. We don't care about fancy drawing in this case.
return 0
}
width := int(ts.Columns)
if width == 0 { // output has been redirected
return 0
}
lines := strings.Split(s.extraOutput, "\n")
numLines := 0
for _, line := range lines {
n := (len(line) + width - 1) / width
if n == 0 {
n = 1
}
numLines += n
}
return numLines - 1
}
// SetupRawTerminal will set terminal to RAW mode and return function to
// restore normal terminal.
func SetupRawTerminal(setSize func(cols, row uint16) error) func() {
// Switch terminal to raw mode
state, err := ttyutils.MakeTerminalRaw(os.Stdout.Fd())
if err != nil {
// If we can't do it just continue as we were
return func() {}
}
// Get TTY size
size, err := ttyutils.Winsize(os.Stdout)
if err == nil && setSize != nil {
setSize(size.Columns, size.Lines)
}
// Handle SIGWINCH signals (window resize signals from graphical terminals)
sigWinch := make(chan os.Signal, 1)
signal.Notify(sigWinch, syscall.SIGWINCH)
go func() {
for range sigWinch {
size, err := ttyutils.Winsize(os.Stdout)
if err == nil && setSize != nil {
setSize(size.Columns, size.Lines)
}
}
}()
// Return a function to cleanup
return func() {
// Stop handling SIGWINCH, and close channel to clean up go routine
signal.Stop(sigWinch)
close(sigWinch)
// Restore terminal state
ttyutils.RestoreTerminalState(os.Stdout.Fd(), state)
fmt.Println("")
}
}
func TestWinSize(t *testing.T) {
mpty, mtty, err := pty.Open()
if err != nil {
t.Fatal(err)
}
defer mtty.Close()
defer mpty.Close()
size, err := ttyutils.Winsize(mtty)
if err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(size, ttyutils.Ttysize{Lines: 0, Columns: 0}) {
t.Errorf("expected 0x0 terminal, got %#v", size)
}
}
func (s *StatusChart) lengthOfOutput() int {
ts, err := ttyutils.Winsize(os.Stdout)
if err != nil {
slog.Error(err)
}
width := int(ts.Columns)
lines := strings.Split(s.extraOutput, "\n")
numLines := 0
for _, line := range lines {
n := (len(line) + width - 1) / width
if n == 0 {
n = 1
}
numLines += n
}
return numLines - 1
}