Re: Changing location of swap directory for selected files, how to?

On Wednesday, September 12, 2012 8:22:44 AM UTC-5, Karthick wrote:
> Hello,
>
>
>
> I would like to modify the value of 'dir' option for a few specific
>
> files (e.g: all files in directory ~/Foo/). Had 'dir' been a buffer
>
> local option, it would have been a easy thing,
>
> au BufEnter ~/Foo/* set dir=newval
>
>
>
> But 'dir' is global across buffers. Can anyone suggest workarounds?
>
>
>
> I have tried
>
> au BufEnter ~/Foo/* call ChangeDir()
>
> au BufLeave ~/Foo/* call RevertDir()
>
>
>
> function ChangeDir()
>
> let b:tmp=&dir
>
> set dir=newval
>
> endfunction
>
>
>
> function RevertDir()
>
> exe 'set dir=' . b:tmp
>
> endfunction
>
>
>
> ..but BufEnter fires *after* swap file is created.
>
>
>
> If you want to know why I'm doing this - it is to prevent .swp files
>
> being created in my DropBox folder (and retain default behavior in all
>
> other cases)
>
>
>
> -Karthick

I bet you could add BufReadPre to your BufEnter autocmd to get it to trigger before swapfile creation. Maybe you'd need to add a BufReadPost to your BufLeave event as well, so that the BufEnter doesn't save the wrong dir option value.

I'm not sure how to make it work when you create a new file. Possibly BufNewFile will work, or you can always create the document outside of Vim before editing.

One workaround might be to set 'noswapfile' globally in your .vimrc, and set 'swapfile' locally on BufEnter, after setting the correct 'dir' option.

Another workaround, which is probably not worth using, is that if a file is loaded with 'readonly' set, Vim doesn't create a swap file until the first change. You might be able to take advantage of this.

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