patchgit-blame.el: show the when, who and what in the minibuffer.

> Change the default operation to show 'when (day the commit was made),
> who (who made the commit), what (what the commit log was)' in the
> minibuffer instead of SHA1 and title of the commit log.
>
> Since the user may prefer other displaying options, it is made as a
> user-configurable option.

> ---
>  contrib/emacs/git-blame.el |   10 +++++++++-
>  1 files changed, 9 insertions(+), 1 deletions(-)
>
> diff --git a/contrib/emacs/git-blame.el b/contrib/emacs/git-blame.el
> index bb671d5..99e2b6f 100644
> --- a/contrib/emacs/git-blame.el
> +++ b/contrib/emacs/git-blame.el
> @@ -105,6 +105,13 @@ selected element from l."
>       (setq ,l (remove e ,l))
>       e))
>  
> +(defvar git-blame-log-oneline-format
> +  "format:[%cr] %cn: %s"
> +  "*Formatting option used for describing current line in the minibuffer.
> +
> +This option is used to pass to git log --pretty= command-line option, 
> +and describe which commit the current line was made.")
> +
>  (defvar git-blame-dark-colors
>    (git-blame-color-scale "0c" "04" "24" "1c" "2c" "34" "14" "3c")
>    "*List of colors (format #RGB) to use in a dark environment.
> @@ -371,7 +378,8 @@ See also function `git-blame-mode'."
>  (defun git-describe-commit (hash)
>    (with-temp-buffer
>      (call-process "git" nil t nil
> -                  "log" "-1" "--pretty=oneline"
> +                  "log" "-1" 
> +		  (concat "--pretty=" git-blame-log-oneline-format)
>                    hash)
>      (buffer-substring (point-min) (1- (point-max)))))