Query font size and DPI from terminal

tools/tui/loop/api.go

@@ -4,6 +4,7 @@ package loop
 
 import (
 	"encoding/base64"
+	"encoding/hex"
 	"fmt"
 	"os"
 	"runtime"
@@ -89,6 +90,9 @@ type Loop struct {
 	// Called when a response to an rc command is received
 	OnRCResponse func(data []byte) error
 
+	// Called when a response to a query command is received
+	OnQueryResponse func(key, val string, valid bool) error
+
 	// Called when any input from tty is received
 	OnReceivedData func(data []byte) error
 
@@ -481,6 +485,17 @@ func (self *Loop) CopyTextToClipboard(text string) {
 	self.copy_text_to(text, "c")
 }
 
+func (self *Loop) QueryTerminal(fields ...string) IdType {
+	if len(fields) == 0 {
+		return 0
+	}
+	q := make([]string, len(fields))
+	for i, x := range fields {
+		q[i] = hex.EncodeToString(utils.UnsafeStringToBytes("kitty-query-" + x))
+	}
+	return self.QueueWriteString(fmt.Sprintf("\x1bP+q%s\a", strings.Join(q, ";")))
+}
+
 func (self *Loop) PushPointerShape(s PointerShape) {
 	self.pointer_shapes = append(self.pointer_shapes, s)
 	self.QueueWriteString("\x1b]22;" + s.String() + "\x1b\\")

tools/tui/loop/run.go

@@ -4,6 +4,7 @@ package loop
 
 import (
 	"bytes"
+	"encoding/hex"
 	"errors"
 	"fmt"
 	"io"
@@ -172,6 +173,24 @@ func (self *Loop) handle_dcs(raw []byte) error {
 	if self.OnRCResponse != nil && bytes.HasPrefix(raw, utils.UnsafeStringToBytes("@kitty-cmd")) {
 		return self.OnRCResponse(raw[len("@kitty-cmd"):])
 	}
+	if self.OnQueryResponse != nil && (bytes.HasPrefix(raw, utils.UnsafeStringToBytes("1+r")) || bytes.HasPrefix(raw, utils.UnsafeStringToBytes("0+r"))) {
+		valid := raw[0] == '1'
+		s := utils.NewSeparatorScanner(utils.UnsafeBytesToString(raw[3:]), ";")
+		for s.Scan() {
+			key, val, _ := strings.Cut(s.Text(), "=")
+			if k, err := hex.DecodeString(key); err == nil {
+				if bytes.HasPrefix(k, utils.UnsafeStringToBytes("kitty-query-")) {
+					k = k[len("kitty-query-"):]
+					if v, err := hex.DecodeString(val); err == nil {
+						if err = self.OnQueryResponse(string(k), string(v), valid); err != nil {
+							return err
+						}
+					}
+				}
+			}
+		}
+		return nil
+	}
 	if self.OnEscapeCode != nil {
 		return self.OnEscapeCode(DCS, raw)
 	}