Richard Stallman wrote:
>     I don't know if you need to sign legal paper for that?
> 
> (He already did.)
> 
>     Does anyone else have an opinion?
> 
> If you like the changes, that is good enough for me.
> 
> Juanma, would you like to install these changes for Masatake Yamato?
> 

Hi,

Attached you will find a new "cleaned" patch for ruler-mode.el.  I
shortened and fixed some doc strings, and renamed some variable for
consistency.
I updated version and copyright too.
Finally I added a small patch I had for better save/restore of
previous header-line-format when enabling/disabling ruler-mode.

The updated change log follows.

Thanks!
David

* ruler-mode.el

(ruler-mode-comment-column-char)
(ruler-mode-goal-column-char)
(ruler-mode-set-goal-column-ding-flag)
(ruler-mode-mouse-current-grab-object): New variables.

(ruler-mode-comment-column-face)
(ruler-mode-goal-column-face): New faces.

(ruler-mode-mouse-set-fill-column): Removed.

(ruler-mode-mouse-grab-any-column)
(ruler-mode-mouse-drag-any-column-iteration)
(ruler-mode-mouse-drag-any-column): New functions.

(ruler-mode-map): [header-line down-mouse-2] Bound to
`ruler-mode-mouse-grab-any-column' instead of
`ruler-mode-mouse-set-fill-column'.
(ruler-mode): Cleanup buffer local variable `header-line-format' if
it didn't exist when `ruler-mode' was enabled.

(ruler-mode-ruler-help-echo): Updated its value.
(ruler-mode-ruler-help-echo-when-goal-column): New help string used
when goal-column is already set.

(ruler-mode-ruler-help-echo-tab): Renamed to...
(ruler-mode-ruler-help-echo-when-tab-stops)): New.

(ruler-mode-fill-column-help-echo)
(ruler-mode-comment-column-help-echo)
(ruler-mode-goal-column-help-echo): New help strings.

(ruler-mode-ruler): Use `ruler-mode-ruler-help-echo-when-goal-column'
instead of `ruler-mode-ruler-help-echo' if `goal-column' is set.  Show
`comment-column' and `goal-column'. Echo the different help string for
each *-column characters on the ruler.