On 2017-12-15, Bram Moolenaar wrote:
> Many plugins set options to a different value. To be able to restore
> the original value very often the old value needs to be saved.
>
> Not only is this a bit of a hassle, especially for local options, it is
> also incomplete, since the location where the option was originally set
> can't be restored.
>
> I have been thinking of adding two functions to make this work better:
>
> option_save({list}) *option_save()*
> Saves the options named in {list}. The returned value can be
> passed to option_restore(). Example: >
> let s:saved_options = option_save([
> \ 'ignorecase',
> \ 'iskeyword',
> \ ])
> au <buffer> BufLeave *
> \ call option_restore(s:saved_options)
> < The advantage over using `:let` is that global and local
> values are handled and the script ID is restored, so that
> `:verbose set` will show where the option was originally set,
> not where it was restored.
>
>
> option_restore({list})
> *option_restore()*
> Restore options previously saved by option_save().
> When buffer-local options have been saved, this function must
> be called when the same buffer is the current buffer.
> When window-local options have been saved, this function must
> be called when the same window is the current window.
> When in the wrong buffer and/or window an error is given and
> the local options won't be restored.
>
> Does that sound useful?
Almost.
I surveyed my plugins for places where I save and restore options
and in almost all cases the function opens a new buffer, sometimes
as the result of a :grep command.
So, this would not be useful to me unless option_save() also
remembered the buffer/window it was in when executed and
option_restore() just restored to that buffer/window, even if it
wasn't the current buffer/window.
Regards,
Gary
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