That's exactly what I was looking for.  I'm only binding it in c-mode
derivatives, so mine looks like:

(add-hook 'c-mode-common-hook 'my-cool-return)

I hope that's OK.  Seems to work, anyways. :)

I very much appreciate the help.  I'm slowly making the shift to emacs and
this kind of programmability really has me floored.

On Tue, Jul 19, 2011 at 12:24 AM, Deniz Dogan <deniz@dogan.se> wrote:

> On 2011-07-19 07:47, Lister Account wrote:
>
>> I have a keybinding I just made that essentially will go to the end of a
>> line, insert a semicolon, return, and auto-indent.
>>
>> I'd like to only add the semicolon if it doesn't already exist.
>>
>> In other words, go to the end of the line, if a semicolon is there,
>> return.  If a semicolon is not there, add one, then return.
>>
>> I'm brand spanking new to emacs, and I'm sure this is a task that others
>> have resolved, but I'm having trouble googling for a solution.
>>
>> Thanks,
>> Steve
>>
>
> (defun hello-there ()
>  (interactive)
>  (move-end-of-line)
>  (unless (looking-back ";")
>    (insert ";"))
>  (newline-and-indent))
>
> Then you would want to bind this to only some modes, and not globally.
> E.g., this way:
>
> (add-hook 'prog-mode-hook
>          (lambda ()
>            (local-set-key (kbd "C-c ;") 'hello-there)))
>
> This binds "C-c ;" to that command.
>
> Hope that helps,
> Deniz
>
>
>