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Here are a batch of refactorings to clean up parsing and parts of the
simple build system.  This patch originated in a patch sent to
cabal-devel@haskell.org with an intial implementation of
configurations.  Since then we decided to go a different route with
configurations, so I have separated the refactoring from the
configurations patch.

At this point, 2 tests fail for me, but I get the same 2 failures
without this patch.

This need not be the same compiler as used to build the package

cabal-install now caches downloaded packages in the directory for the package, and with .tar.gz extension.

cabal-install.cabal: Added build-type field. Change hs-source-dir to hs-source-dirs (hs-source-dir has been deprecated for some time).

As discussed on the libraries list (Nov 2006), add a field Build-Type
which can be used to declare that this package uses one of the boilerplate
setup scripts.  This allows setupWrapper (used by cabal-setup and
cabal-install) to bypass the setup script in this case and perform
the setup actions itself.

cabal-install now puts the package list in /var/lib/cabal-install and the tarballs in /var/cache/cabal-install by default. Added command-line options for changing those.

cabal-install: Output usage info for the right command when pasrsing the package name arguments fails.

Moved the cabal-setup code to Distribution.SetupWrapper, so that cabal-install can use it. CabalSetup.hs now just calls the setupWrapper function.

Original patch:
Sat Sep  2 00:13:40 CEST 2006  Paolo Martini <paolo@nemail.it>
  * Multiple repositories.

Original patch:
Sun Aug 20 19:01:03 CEST 2006  Paolo Martini <paolo@nemail.it>
  * Stripping off the dependencies, only HTTP left