my-emacs-d/lisp/prog.el

;;; gp-prog --- Summary

;;; Commentary:

;;; Code:
(defun gpolonkai/prog-in-string-p ()
  "Return t if point is inside a string."
  (nth 3 (syntax-ppss)))

(defun gpolonkai/prog-in-comment-p ()
  "Return t if point is inside a comment."
  (nth 4 (syntax-ppss)))

(defun gpolonkai/python-add-docstring ()
  "Add a Python docstring to the current thing.

If point is inside a function, add docstring to that.  If point
is in a class, add docstring to that.  If neither, add docstring
to the beginning of the file."
  (interactive)
  (save-restriction
    (widen)
    (beginning-of-defun)
    (if (not (looking-at-p "\\(def\\|class\\) "))
        (progn
          (goto-char (point-min))
          (back-to-indentation)
          (forward-char)
          (while (gpolonkai/prog-in-comment-p)
            (forward-line)
            (back-to-indentation)
            (forward-char)))
      (search-forward ":")
      (while (or (gpolonkai/prog-in-string-p)
                 (gpolonkai/prog-in-comment-p))
        (search-forward ":")))
    (if (eq 1 (count-lines 1 (point)))
        (open-line-above)
      (open-line-below))
    (insert "\"\"\"")
    (open-line-below)
    (insert "\"\"\"")
    (open-line-above)))

(defun camel-to-snake-case (arg)
  "Convert a camel case (camelCase or CamelCase) word to snake case (snake_case).

If the prefix argument ARG is non-nil, convert the text to uppercase."
  (interactive "p")
  (progn
    (let ((start (region-beginning))
          (end (region-end))
          (case-fold-search nil)
          (had-initial-underscore nil))
      (goto-char start)
      (when (looking-at "_") (setq had-initial-underscore t))
      (while (re-search-forward "\\([A-Z]\\)" end t)
        (replace-match "_\\1")
        (setq end (1+ end)))
      (if arg
          (upcase-region start end)
        (downcase-region start end))
      (goto-char start)
      (unless had-initial-underscore (delete-char 1)))))

(provide 'gp-prog)

;;; gp-prog.el ends here