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I wonder whether it is possible to make f in evil and/or in evil-easymotion case insensitive?

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There is no setting to do this for Evil's f. If you inspect the command's definition you'll find that it binds case-fold-search to nil which makes Emacs treat search results case-sensitively. What you can do here is copying its definition, renaming the command and changing the value of case-fold-search to t, then binding the renamed command to the original key:

(evil-define-motion my-evil-find-char (count char)
    "Move to the next COUNT'th occurrence of CHAR.
Movement is restricted to the current line unless `evil-cross-lines' is non-nil."
    :type inclusive
    (interactive "<c><C>")
    (setq count (or count 1))
    (let ((fwd (> count 0)))
      (setq evil-last-find (list #'evil-find-char char fwd))
      (when fwd (forward-char))
      (let ((case-fold-search t))
        (unless (prog1
                    (search-forward (char-to-string char)
                                    (unless evil-cross-lines
                                      (if fwd
                                          (line-end-position)
                                        (line-beginning-position)))
                                    t count)
                  (when fwd (backward-char)))
          (user-error "Can't find %c" char)))))

(with-eval-after-load 'evil
  (define-key evil-motion-state-map (kbd "f") 'my-evil-find-char))

Exercise left to the reader: Doing the equivalent for F and easy-motion commands.

  • Thanks. I don't quite understand all of the stuff in the evil-easymotion, I've tried to replace the function names with my-evil-find-char but couldn't make it work. I guess it would take a bit of effort. BUT. I have just renamed your function to evil-find-char, load it after evil and it seems that it has over-written the original function. And it works perfectly fine with evil-easymotion. I suppose it's not a good idea to over-write stuff but it works fine for this purpose. – A. Blizzard Nov 8 '18 at 11:15

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