Functions to punch DCS escapes through tmux

tools/tui/dcs_to_kitty.go

@@ -0,0 +1,28 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package tui
+
+import (
+	"encoding/base64"
+	"fmt"
+
+	"kitty/tools/utils"
+)
+
+var _ = fmt.Print
+
+func DCSToKitty(msgtype, payload string) (string, error) {
+	data := base64.StdEncoding.EncodeToString(utils.UnsafeStringToBytes(payload))
+	ans := "\x1bP@kitty-" + msgtype + "|" + data
+	tmux := TmuxSocketAddress()
+	if tmux != "" {
+		err := TmuxAllowPassthrough()
+		if err != nil {
+			return "", err
+		}
+		ans = "\033Ptmux;\033" + ans + "\033\033\\\033\\"
+	} else {
+		ans += "\033\\"
+	}
+	return ans, nil
+}

tools/tui/tmux.go

@@ -0,0 +1,56 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package tui
+
+import (
+	"fmt"
+	"kitty/tools/utils"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"github.com/shirou/gopsutil/v3/process"
+	"golang.org/x/sys/unix"
+)
+
+var _ = fmt.Print
+
+func tmux_socket_address() (socket string) {
+	socket = os.Getenv("TMUX")
+	if socket == "" {
+		return ""
+	}
+	addr, pid_str, found := strings.Cut(socket, ",")
+	if !found {
+		return ""
+	}
+	if unix.Access(addr, unix.R_OK|unix.W_OK) != nil {
+		return ""
+	}
+	pid, err := strconv.ParseInt(pid_str, 10, 32)
+	if err != nil {
+		return ""
+	}
+	p, err := process.NewProcess(int32(pid))
+	if err != nil {
+		return ""
+	}
+	cmd, err := p.CmdlineSlice()
+	if err != nil {
+		return ""
+	}
+	if len(cmd) > 0 && strings.ToLower(filepath.Base(cmd[0])) != "tmux" {
+		return ""
+	}
+	return socket
+}
+
+var TmuxSocketAddress = (&utils.Once[string]{Run: tmux_socket_address}).Get
+
+func tmux_allow_passthrough() error {
+	return exec.Command("tmux", "set", "-p", "allow-passthrough", "on").Run()
+}
+
+var TmuxAllowPassthrough = (&utils.Once[error]{Run: tmux_allow_passthrough}).Get