Hi

the following emacs lisp code makes typing # DWIM. At the "end" of a perl code line it will automatically indent to the comment-column.

Example typing ..."huhu";#the hash... will produce this indentation: 

sub load {
  print "huhu";                 # the hash automatically "jumped"

[download]
The code is work in progress if you find bugs feel free to reply here. 
(defun my-indent-for-comment (arg)
  "dwim indent-for-comment V0.03"
  (interactive "p")
  (cperl-update-syntaxification (point) (point))
  (if (and
       (not (memq (preceding-char)  '(?$) ))
       ;; (memq (preceding-char)  '( ?\; ?{ ?\( ?\[ ) )
       (memq  (get-text-property (point) 'face) '(cperl-my-trailing-sp
+aces-face nil))
       (looking-at "[[:space:]]*$")
       )
      (cperl-indent-for-comment)
    (insert "#"))
  )        


(add-hook
 'cperl-mode-hook
 (lambda ()
   (local-set-key (kbd "C-#") 'comment-dwim)
   (local-set-key (kbd "#") 'my-indent-for-comment)
   (set-variable 'cperl-comment-column 45 )
   ))

[download]
Plz note I also bound C-# to what normally M-; does, because it's much easier to reach on QWERTZ keyboards and IMHO more intuitive in Perl context. Additionally this command will also automatically comment/uncomment selected text.

UPDATE: You have the choice between different levels of aggressiveness, ATM the command checks¹ if the hash doesn't follow a blacklist of chars (actually $). You can change this behaviour to more restrictive whitelisting by uncommenting the following line (i.e. has to follow ; { ( [)

Cheers Rolf

¹) Additionally to excluding any syntax groups (string,command,...) and assuring that only whitespaces follow till the end of line.

In reply to [emacs] automatically indent to comment-column by LanX

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