Automatic mime-type detection

Is there a way to have automatic mime-type detection when adding
a file (not based on the file name, but on the file contents)?
If there is a way to automatically call an external program when
doing an "svn add", "file -i" can be called (under Unix), which
returns the guessed mime-type (it is sometimes wrong, but the
user could change it in this case, before the commit).

-- 
Vincent Lefèvre <vincent_at_vinc17.org> - Web: <http://www.vinc17.org/> - 100%
validated HTML - Acorn Risc PC, Yellow Pig 17, Championnat International des
Jeux Mathématiques et Logiques, TETRHEX, etc.
Work: CR INRIA - computer arithmetic / SPACES project at LORIA
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