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I'd like to send some commands to the terminal Emacs is running in, using send-string-to-terminal. However, some terminals don't support the command I have in mind.

When this is the case, the command is echoed after the cursor, temporarily overwriting the display, and causing graphical corruption:

Result of running M-:(send-string-to-terminal "\e[5 q") in xfce4-terminal

enter image description here

(Note that the text appears in the echo area by mere coincidence—if I had run the code using a keybinding in a different buffer, the output would be positioned after the cursor)

Obviously, this is not desirable. Is there a way to hide the output (or mask it by redrawing the display in that region) so the command can silently fail?

  • 1
    Try (redisplay t) or (force-window-update). – Dan Jan 22 '16 at 23:41
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    Try (message) or (message "") to clear the echo area. – wasamasa Jan 23 '16 at 10:00
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You may temporarily replace the message function, which does the actual job of displaying the string in the echo area :

(cl-letf (((symbol-function 'message) #'ignore))
  (send-string-to-terminal "\e[5 q"))

ignore takes an arbitrary number of arguments, does nothing and returns nil.


EDIT

I misunderstood the question's meaning. It turns out, after looking a bit at the send-string-to-terminal function definition in Emacs' C source, there is no way to prevent it from echoing the supplied command.

  • Unfortunately, this doesn't help. message isn't actually used in send-string-to-terminal, so there's no effect. Furthermore, the output doesn't always occur in the minibuffer. As I stated, it occurs after the cursor. It's placement in the minibuffer is merely a side-effect of my using the minibuffer to call the code. – PythonNut Dec 23 '15 at 21:33
  • Oops :) I updated my answer with relevant info. – ngqrl Dec 23 '15 at 22:19
  • Sorry about that, I'll add some more info to the question so nobody else gets confused. – PythonNut Dec 23 '15 at 22:39

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