Prefix lines with a counter

Here is something I constantly find myself needing to do:

Start with a list of items delineated by line breaks:

foo
bar
baz

And turn it into a markdown numbered list:

1. foo
2. bar
3. baz

I know that I *could* use 1. for every item, since that's easy enough
to do and Markdown knows what to do when rendering, but that's not so
good for human readers of plain text.

Is there a way I can have vim prefix the lines with an ascending
counter like the above?

c
--
Chris Lott <chris@chrislott.org>

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