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In a function X that calls completing-read, I'd like to be able to call X and pass in a constant input without invoking the minibuffer. From the emacs manual, it seems I'm supposed to flet completing-read-function, but I'm not sure the correct way to do this.

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Assuming that you want the constant input to be optional, you can declare the function as taking an optional argument and then check if the argument is actually passed: if it is, go ahead and use it; if it isn't, then call completing-read.

Something like this:

(defun X (&optional foo)
  (message (or foo (completing-read "Enter foo value: " nil)))

where I assume that the value of foo is a string.

If you call it with M-: (X), then foo will be nil and you will get the prompt. If you call it with M-: (X "bar") then no prompt will be issued and the value of foo will be the string bar.

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    (Nit:) (when (null foo)) = (unless foo).
    – Drew
    Jan 1, 2022 at 20:34
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    Hi @NickD, the function X in question is counsel-org-goto, which isn't my function. I'd like to refrain from changing it, and instead, when it calls completing-read, have a user-supplied constant value automatically fed in. Jan 5, 2022 at 18:50
  • You should have specified that in your question. I do not have time to check (and I know nothing about counsel), so I'm afraid I can't help. Maybe somebody else will provide an answer.
    – NickD
    Jan 5, 2022 at 19:43

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