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This patch, which *changes the configuration format*, adds easy plugin support
by using an existential type for storing the list of commands to be
executed. Adding a plugin is just a matter of writing the appropriate
instance of the Exec class, after importing Commands.hs.
I must thank Claus Reinke for the help in understanding the mysteries of
reading existential types. The Read instance of Runnable must be credited to
him. See here:
http://www.haskell.org/pipermail/haskell-cafe/2007-July/028227.html
darcs-hash:20070712175034-d6583-f10174bb3b0a9b4f6e08d05052c18f30e539b319.gz
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