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I have a working sexp for configuration vc-git-grep:

(setq vc-git-grep-template "git --no-pager grep -n -i -e <R> -- <F>")

Then in dired-mode I evaluate M-x vc-git-grep and everething works as expected.

And then I want to create defun:

(defun Pfedj/vc-git-grep-noncase()
  (interactive)
  (setq vc-git-grep-template "git --no-pager grep -n -i -e <R> -- <F>")
  (vc-git-grep))

When in dired-mode I evaluate

M-x Pfedj/vc-git-grep-template

==> Wrong number of arguments: (1 . 3), 0

How can I fix my function?

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vc-git-grep is an interactive function which prompts, so when you want to call it from your own code you need to use call-interactively, otherwise it expects you to have supplied its required arguments in the call:

(defun Pfedj/vc-git-grep-noncase()
  (interactive)
  (setq vc-git-grep-template "git --no-pager grep -n -i -e <R> -- <F>")
  (call-interactively #'vc-git-grep))

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