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

On Wed, Sep 12, 2012 at 10:00 PM, Marcin Szamotulski <mszamot@gmail.com> wrote:
> On 08:03 Wed 12 Sep , Ben Fritz wrote:
>> 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.
>
> What about this idea:
>
> function! ChangeSwap()
> let dir=&dir
> set dir=/tmp
> set swapfile!
> set swapfile!
> let &dir=dir
> endfunction
>
> au BufReadPost ../DrobBox/* :call ChangeSwap()

I don't understand the intent here, ChangeSwap() would set all values
back to original by the time the function quits?

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