git describe candidate filtering

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Would it be possible to add an option to git-describe that limits the
candidate tags to those matching a glob pattern or regular expression?
I've got a repository imported from CVS which has a number of less
interesting tags for events such as branch creation, but I'm only
interested in describing the current commit relative to tags matching
v[0-9]\.[0-9]*, rather than the closest tag of any spelling.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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