Converting from camelcase to _ in emacs

Question

Is there an emacs function to convert a camel-cased word to underscore? Something, like:

longVariableName

M-x to-underscore

Answer 1

I use this when converting C# code to PHP.

(defun un-camelcase-word-at-point ()
  "un-camelcase the word at point, replacing uppercase chars with
the lowercase version preceded by an underscore.

The first char, if capitalized (eg, PascalCase) is just
downcased, no preceding underscore.
"
  (interactive)
  (save-excursion
    (let ((bounds (bounds-of-thing-at-point 'word)))
      (replace-regexp "\\([A-Z]\\)" "_\\1" nil
                      (1+ (car bounds)) (cdr bounds))
      (downcase-region (car bounds) (cdr bounds)))))

And then in my php-mode fn:

(local-set-key "\M-\C-C"  'un-camelcase-word-at-point)

Answer 2

Use the string-inflection package, available on MELPA, or at https://github.com/akicho8/string-inflection.

Useful keyboard shortcuts, copied from https://www.emacswiki.org/emacs/CamelCase :

;; Cycle between snake case, camel case, etc.
(require 'string-inflection)
(global-set-key (kbd "C-c i") 'string-inflection-cycle)
(global-set-key (kbd "C-c C") 'string-inflection-camelcase)        ;; Force to CamelCase
(global-set-key (kbd "C-c L") 'string-inflection-lower-camelcase)  ;; Force to lowerCamelCase
(global-set-key (kbd "C-c J") 'string-inflection-java-style-cycle) ;; Cycle through Java styles

Answer 3

@ens' answer was close, but a little buggy for me on Emacs 26.1. I fixed the bug and added the ability, via C-u prefix arg, to specify if you want the first letter of camel case to be lower case:

(defun toggle-camelcase-underscores (first-lower-p)
  "Toggle between camelcase and underscore notation for the
symbol at point. If prefix arg, C-u, is supplied, then make first
letter of camelcase lowercase."
  (interactive "P")
  (save-excursion
    (let* ((bounds (bounds-of-thing-at-point 'symbol))
           (start (car bounds))
           (end (cdr bounds))
           (currently-using-underscores-p (progn (goto-char start)
                                                 (re-search-forward "_" end t))))
      (if currently-using-underscores-p
          (progn
            (replace-string "_" " " nil start end)
            (upcase-initials-region start end)
            (replace-string " " "" nil start end)
            (when first-lower-p
              (downcase-region start (1+ start))))
        (replace-regexp "\\([A-Z]\\)" "_\\1" nil (1+ start) end)
        (downcase-region start (cdr (bounds-of-thing-at-point 'symbol)))))))

Answer 4

I use the following for toggling between camelcase and underscores:

(defun toggle-camelcase-underscores ()
  "Toggle between camelcase and underscore notation for the symbol at point."
  (interactive)
  (save-excursion
    (let* ((bounds (bounds-of-thing-at-point 'symbol))
           (start (car bounds))
           (end (cdr bounds))
           (currently-using-underscores-p (progn (goto-char start)
                                                 (re-search-forward "_" end t))))
      (if currently-using-underscores-p
          (progn
            (upcase-initials-region start end)
            (replace-string "_" "" nil start end)
            (downcase-region start (1+ start)))
        (replace-regexp "\\([A-Z]\\)" "_\\1" nil (1+ start) end)
        (downcase-region start (cdr (bounds-of-thing-at-point 'symbol)))))))

Answer 5

(progn (replace-regexp "\\([A-Z]\\)" "_\\1" nil (region-beginning) (region-end))
       (downcase-region (region-beginning) (region-end)))

Answer 6

There is now another general way in 2018: magnars/s.el: The long lost Emacs string manipulation library. - github.com, some examples regarding OP's question:

1. whatever case to snake case(underscore seperated):

   (s-snake-case "some words") ;; => "some_words"
   (s-snake-case "dashed-words") ;; => "dashed_words"
   (s-snake-case "camelCasedWords") ;; => "camel_cased_words"
   

2. whatever case to lower camel case:

   (s-lower-camel-case "some words") ;; => "someWords"
   (s-lower-camel-case "dashed-words") ;; => "dashedWords"
   (s-lower-camel-case "under_scored_words") ;; => "underScoredWords"
   

see more examples at its repo.