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// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
package at
import (
"encoding/json"
"os"
"time"
"github.com/kovidgoyal/kitty/tools/tui/loop"
"github.com/kovidgoyal/kitty/tools/utils"
)
type stream_response struct {
Ok bool `json:"ok"`
Stream bool `json:"stream"`
}
func is_stream_response(serialized_response []byte) bool {
var response stream_response
if len(serialized_response) > 32 {
return false
}
err := json.Unmarshal(serialized_response, &response)
return err == nil && response.Stream
}
func do_chunked_io(io_data *rc_io_data) (serialized_response []byte, err error) {
serialized_response = make([]byte, 0)
// we cant do inbandresize notification as in the --no-response case the
// command can cause a resize and the loop can quit before the notification
// arrives, leading to the notification being sent to whatever is executed
// after us. Similarly no focus tracking.
lp, err := loop.New(loop.NoAlternateScreen, loop.NoRestoreColors, loop.NoInBandResizeNotifications, loop.NoFocusTracking)
if io_data.on_key_event != nil {
lp.FullKeyboardProtocol()
} else {
lp.NoKeyboardStateChange()
}
if err != nil {
return
}
const (
BEFORE_FIRST_ESCAPE_CODE_SENT = iota
WAITING_FOR_STREAMING_RESPONSE
SENDING
WAITING_FOR_RESPONSE
)
state := BEFORE_FIRST_ESCAPE_CODE_SENT
var last_received_data_at time.Time
var check_for_timeout func(timer_id loop.IdType) error
wants_streaming := false
check_for_timeout = func(timer_id loop.IdType) (err error) {
if state != WAITING_FOR_RESPONSE && state != WAITING_FOR_STREAMING_RESPONSE {
return
}
if io_data.on_key_event != nil {
return
}
time_since_last_received_data := time.Since(last_received_data_at)
if time_since_last_received_data >= io_data.timeout {
return os.ErrDeadlineExceeded
}
_, err = lp.AddTimer(io_data.timeout-time_since_last_received_data, false, check_for_timeout)
return
}
transition_to_read := func() {
if state == WAITING_FOR_RESPONSE && io_data.rc.NoResponse {
lp.Quit(0)
}
last_received_data_at = time.Now()
_, _ = lp.AddTimer(io_data.timeout, false, check_for_timeout)
}
lp.OnReceivedData = func(data []byte) error {
last_received_data_at = time.Now()
return nil
}
queue_escape_code := func(data []byte) {
lp.QueueWriteString(cmd_escape_code_prefix)
lp.UnsafeQueueWriteBytes(data)
lp.QueueWriteString(cmd_escape_code_suffix)
}
lp.OnInitialize = func() (string, error) {
chunk, err := io_data.next_chunk()
wants_streaming = io_data.rc.Stream
if err != nil {
if err == waiting_on_stdin {
return "", nil
}
return "", err
}
if len(chunk) == 0 {
state = WAITING_FOR_RESPONSE
transition_to_read()
} else {
queue_escape_code(chunk)
}
return "", nil
}
lp.OnWriteComplete = func(completed_write_id loop.IdType, has_pending_writes bool) error {
if state == WAITING_FOR_STREAMING_RESPONSE || state == WAITING_FOR_RESPONSE {
return nil
}
chunk, err := io_data.next_chunk()
if err != nil {
if err == waiting_on_stdin {
return nil
}
return err
}
if len(chunk) == 0 {
state = utils.IfElse(state == BEFORE_FIRST_ESCAPE_CODE_SENT && wants_streaming, WAITING_FOR_STREAMING_RESPONSE, WAITING_FOR_RESPONSE)
transition_to_read()
} else {
queue_escape_code(chunk)
}
if state == BEFORE_FIRST_ESCAPE_CODE_SENT {
if wants_streaming {
state = WAITING_FOR_STREAMING_RESPONSE
transition_to_read()
} else {
state = SENDING
}
}
return nil
}
lp.OnKeyEvent = func(event *loop.KeyEvent) error {
if io_data.on_key_event == nil {
return nil
}
err := io_data.on_key_event(lp, event)
if err == end_reading_from_stdin {
lp.Quit(0)
return nil
}
if err != nil {
return err
}
chunk, err := io_data.next_chunk()
if err != nil {
if err == waiting_on_stdin {
return nil
}
return err
}
queue_escape_code(chunk)
return err
}
lp.OnRCResponse = func(raw []byte) error {
if state == WAITING_FOR_STREAMING_RESPONSE && is_stream_response(raw) {
state = SENDING
return lp.OnWriteComplete(0, false)
}
serialized_response = raw
lp.Quit(0)
return nil
}
err = lp.Run()
if err == nil {
lp.KillIfSignalled()
}
return
}
func do_tty_io(io_data *rc_io_data) (serialized_response []byte, err error) {
return do_chunked_io(io_data)
}
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