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tty.go
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tty.go
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package tea
import (
"errors"
"fmt"
"io"
"time"
"github.com/charmbracelet/x/term"
"github.com/muesli/cancelreader"
)
func (p *Program) suspend() {
if err := p.ReleaseTerminal(); err != nil {
// If we can't release input, abort.
return
}
suspendProcess()
_ = p.RestoreTerminal()
go p.Send(ResumeMsg{})
}
func (p *Program) initTerminal() error {
if _, ok := p.renderer.(*nilRenderer); ok {
// No need to initialize the terminal if we're not rendering
return nil
}
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.reportFocus() {
p.renderer.disableReportFocus()
}
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.ttyInput != nil && p.previousTtyInputState != nil {
if err := term.Restore(p.ttyInput.Fd(), p.previousTtyInputState); err != nil {
return fmt.Errorf("error restoring console: %w", err)
}
}
if p.ttyOutput != nil && p.previousOutputState != nil {
if err := term.Restore(p.ttyOutput.Fd(), p.previousOutputState); 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() {
if p.ttyOutput == nil {
// can't query window size
return
}
w, h, err := term.GetSize(p.ttyOutput.Fd())
if err != nil {
select {
case <-p.ctx.Done():
case p.errs <- err:
}
return
}
p.Send(WindowSizeMsg{
Width: w,
Height: h,
})
}