Hello,

I'm trying to use copy-pipe with my yank[1] script to copy the
selection to my system clipboard via the OSC 52 escape sequence.
But in order for this to work, the escape sequence needs to be
written *directly* to the terminal device that has tmux attached.

I tried the following copy-mode key bindings, but nothing worked:

  bind-key -t vi-copy y copy-pipe 'yank'
  bind-key -t vi-copy y copy-pipe 'yank > /dev/tty'
  bind-key -t vi-copy y copy-pipe 'yank > #{pane_tty}'
  bind-key -t vi-copy y copy-pipe 'tmux run-shell "yank > #{pane_tty}"'

In contrast, writing to #{pane_tty} works in normal key bindings:

  # transfer most-recently copied text to attached terminal with yank:
  bind-key -n M-y run-shell 'tmux save-buffer - | yank > #{pane_tty}'

  # transfer previously copied text (chosen from a menu) to attached terminal:
  bind-key -n M-Y choose-buffer 'run-shell "tmux save-buffer -b \"%%\" - | yank 
> #{pane_tty}"'

How can I interpolate the correct #{pane_tty} value into copy-pipe?

Thanks for your consideration.

[1]: https://github.com/sunaku/home/blob/master/bin/yank

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