Listing authors of each file in branch HEAD since given revision

["Alexander Gladysh" <agladysh@gmail.com>]

Hi, list!

For each file in the head of my current branch I need to get a list of
all people who altered it since given revision. If file was not
changed, it should be not listed.

Something like:

  my/file1.ext user1 user2 user3
  my/file2.ext user1

I also need to be able to get closer view with commit names and
messages for along with author names:

  my/file1.ext
    <hash> user1 commit text1
    <hash> user2 commit text2
    <hash> user3 commit text2

  my/file2.ext
    <hash> user1 commit text1

I believe there should be such tool already, or it should be simple
enough to glue it from existing pieces. Please point me to the right
direction.

Thanks in advance,
Alexander.