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Implement Enable/Disable/Detect Kitty Keyboard Protocol #159

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This PR allows for enabling and disabling kitty keyboard protocol.

https://sw.kovidgoyal.net/kitty/keyboard-protocol/

This PR adds for returning the progressive enhancements so that the terminal
application can detect which features are supported.

KittyKeyboardProtocolSupport() byte

The byte returned represents the bitset of supported flags.

0b1     (01) — Disambiguate escape codes
0b10    (02) — Report event types
0b100   (04) — Report alternate keys
0b1000  (08) — Report all keys as escape codes
0b10000 (16) — Report associated text

@@ -113,6 +113,79 @@ func (o Output) backgroundColor() Color {
return ANSIColor(0)
}

func (o Output) kittyKeyboardProtocolSupport() byte {
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We probably want to combine both this and termStatusReport into one routine that gets executed when the output is being initialized. Right now, both kittyKeyboardProtocolSupport & termStatusReport will set the tty termios and read the envs before reading the response. This results in multiple unnecessary calls to GetTermios/SetTermios and Getenv.

Instead, we could define an initialize function that queries the terminal once. However, I believe this might break things since we query the terminal during the lifetime of WithColorCache https://github.com/muesli/termenv/pull/159/files#diff-35d16970a063a59d666ecdce46f6ac3363f36d17a3e672d8ff69f9ef2056d4cbR114

cc/ @muesli

// 0b100 (04) — Report alternate keys
// 0b1000 (08) — Report all keys as escape codes
// 0b10000 (16) — Report associated text.
func (o Output) KittyKeyboardProtocolSupport() byte {
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Might be worth introducing constants for these return values.


// first, send CSI query to see whether this terminal supports the
// kitty keyboard protocol
fmt.Fprintf(tty, CSI+"?u")
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I assume other terminals simply ignore these queries? We should test this with the common set of terminals we usually test against.

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3 participants