emacs-style file backups

Hi,

I turned on file backups using "set backup" in my .vimrc. However, I want to have emacs-style file backup behavior:

"Emacs makes a backup for a file only the first time the file is saved from a buffer. No matter how many times you subsequently save the file, its backup remains unchanged. However, if you kill the buffer and then visit the file again, a new backup file will be made."

Is there anyway for vim to do this? Or has anyone written any scripts to do this?

(Vim's backups just write an additional "filename~" every time you save the file, regardless if it was the first save.)


Thanks for your help,
Alan

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