Hi,
here is a patch, that implements an OptionSet autocommand. This can be 
used, to execute certain actions when an option is set. The pattern is 
matched against the long option name, so one can react to specific 
options. E.g. Checking that the 'backupdir' directory exists and can be 
created if necessary. It therefore provides the new v:option_new, 
v:option_old and v:option_type so one can check the old and new value 
and one can also get the scope of the set command.

This still needs some work and I am also have to write some test for it, 
but I figured I ask, whether this feature would be interesting enough to 
be included, before I proceed with some more work on it.

This is also mentioned in the todo list
,----
| 7   Autocommand for when an option is changed.  Match buffer name or 
| option name?
`----

Comments?

Best,
Christian
-- 
Was wäre das Leben, hätten wir nicht den Mut, etwas zu riskieren?
                -- Vincent Willem van Gogh

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