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tty.go
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tty.go
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package tea
import (
"errors"
"fmt"
"io"
"os"
"time"
"github.com/muesli/cancelreader"
"golang.org/x/term"
)
func (p *Program) initTerminal() error {
if err := p.initInput(); err != nil {
return err
}
p.renderer.hideCursor()
return nil
}
// restoreTerminalState restores the terminal to the state prior to running the
// Bubble Tea program.
func (p *Program) restoreTerminalState() error {
if p.renderer != nil {
p.renderer.disableBracketedPaste()
p.renderer.showCursor()
p.disableMouse()
if p.renderer.altScreen() {
p.renderer.exitAltScreen()
// give the terminal a moment to catch up
time.Sleep(time.Millisecond * 10) //nolint:gomnd
}
}
return p.restoreInput()
}
// restoreInput restores the tty input to its original state.
func (p *Program) restoreInput() error {
if p.tty != nil && p.previousTtyState != nil {
if err := term.Restore(int(p.tty.Fd()), p.previousTtyState); err != nil {
return fmt.Errorf("error restoring console: %w", err)
}
}
return nil
}
// initCancelReader (re)commences reading inputs.
func (p *Program) initCancelReader() error {
var err error
p.cancelReader, err = newInputReader(p.input)
if err != nil {
return fmt.Errorf("error creating cancelreader: %w", err)
}
p.readLoopDone = make(chan struct{})
go p.readLoop()
return nil
}
func (p *Program) readLoop() {
defer close(p.readLoopDone)
err := readInputs(p.ctx, p.msgs, p.cancelReader)
if !errors.Is(err, io.EOF) && !errors.Is(err, cancelreader.ErrCanceled) {
select {
case <-p.ctx.Done():
case p.errs <- err:
}
}
}
// waitForReadLoop waits for the cancelReader to finish its read loop.
func (p *Program) waitForReadLoop() {
select {
case <-p.readLoopDone:
case <-time.After(500 * time.Millisecond): //nolint:gomnd
// The read loop hangs, which means the input
// cancelReader's cancel function has returned true even
// though it was not able to cancel the read.
}
}
// checkResize detects the current size of the output and informs the program
// via a WindowSizeMsg.
func (p *Program) checkResize() {
f, ok := p.output.TTY().(*os.File)
if !ok || !term.IsTerminal(int(f.Fd())) {
// can't query window size
return
}
w, h, err := term.GetSize(int(f.Fd()))
if err != nil {
select {
case <-p.ctx.Done():
case p.errs <- err:
}
return
}
p.Send(WindowSizeMsg{
Width: w,
Height: h,
})
}