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package term
import (
"image/color"
"io"
"time"
"github.com/charmbracelet/x/ansi"
"github.com/charmbracelet/x/input"
)
// File represents a file that has a file descriptor and can be read from,
// written to, and closed.
type File interface {
io.ReadWriteCloser
Fd() uintptr
}
// QueryBackgroundColor queries the terminal for the background color.
// If the terminal does not support querying the background color, nil is
// returned.
//
// Note: you will need to set the input to raw mode before calling this
// function.
//
// state, _ := term.MakeRaw(in.Fd())
// defer term.Restore(in.Fd(), state)
func QueryBackgroundColor(in io.Reader, out io.Writer) (c color.Color, err error) {
// nolint: errcheck
err = QueryTerminal(in, out, defaultQueryTimeout,
func(events []input.Event) bool {
for _, e := range events {
switch e := e.(type) {
case input.BackgroundColorEvent:
c = e.Color
continue // we need to consume the next DA1 event
case input.PrimaryDeviceAttributesEvent:
return false
}
}
return true
}, ansi.RequestBackgroundColor+ansi.RequestPrimaryDeviceAttributes)
return
}
// QueryKittyKeyboard returns the enabled Kitty keyboard protocol options.
// -1 means the terminal does not support the feature.
//
// Note: you will need to set the input to raw mode before calling this
// function.
//
// state, _ := term.MakeRaw(in.Fd())
// defer term.Restore(in.Fd(), state)
func QueryKittyKeyboard(in io.Reader, out io.Writer) (flags int, err error) {
flags = -1
// nolint: errcheck
err = QueryTerminal(in, out, defaultQueryTimeout,
func(events []input.Event) bool {
for _, e := range events {
switch event := e.(type) {
case input.KittyKeyboardEvent:
flags = int(event)
continue // we need to consume the next DA1 event
case input.PrimaryDeviceAttributesEvent:
return false
}
}
return true
}, ansi.RequestKittyKeyboard+ansi.RequestPrimaryDeviceAttributes)
return
}
const defaultQueryTimeout = time.Second * 2
// QueryTerminalFilter is a function that filters input events using a type
// switch. If false is returned, the QueryTerminal function will stop reading
// input.
type QueryTerminalFilter func(events []input.Event) bool
// QueryTerminal queries the terminal for support of various features and
// returns a list of response events.
// Most of the time, you will need to set stdin to raw mode before calling this
// function.
// Note: This function will block until the terminal responds or the timeout
// is reached.
func QueryTerminal(
in io.Reader,
out io.Writer,
timeout time.Duration,
filter QueryTerminalFilter,
query string,
) error {
rd, err := input.NewDriver(in, "", 0)
if err != nil {
return err
}
defer rd.Close() // nolint: errcheck
done := make(chan struct{}, 1)
defer close(done)
go func() {
select {
case <-done:
case <-time.After(timeout):
rd.Cancel()
}
}()
if _, err := io.WriteString(out, query); err != nil {
return err
}
for {
events, err := rd.ReadEvents()
if err != nil {
return err
}
if !filter(events) {
break
}
}
return nil
}
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