Emacs Add semicolon at the end of the line

semicolon.el

(defun semicolon ()
  "Add semicolon at the end of the line and return to current position"
  (interactive)
  (setq current (point))
  (end-of-line)
  (if (not (= (preceding-char) 59))
    (insert ";")
    )
  (goto-char current)
  )

a simpler version.

(defun insert-semicolorn ()
"Add semicolon at the end of the line and return to current position"
 (interactive)
 (save-excursion
   (end-of-line)
   (insert ";")))

a better use for that for new comers to emacs is to use it with specific mode like so ( here I am using it with php )

(add-hook 'php-mode-hook
	  (lambda ()
	    (defun insert-semicolorn ()
	      "Add semicolon at the end of the line and return to current position"
	      (interactive)
	      (save-excursion
	      (end-of-line)
	      (insert ";")))))