Gentoo Haskell project
**********************

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Quickest start
==============

First, let's enable the Gentoo Haskell overlay. We can either use the
eselect-repository method::

    # Install eselect-repository if you don't already have it
    emerge app-eselect/eselect-repository
    # Fetch and output the list of overlays
    eselect repository list
    eselect repository enable haskell

or we can use the layman method::
  
    # Add important USE flags for layman to your package.use directory:
    echo "app-portage/layman sync-plugin-portage git" >> /etc/portage/package.use/layman
    # Install layman if you don't already have it
    emerge app-portage/layman
    # Rebuild layman's repos.conf file:
    layman-updater -R
    # Add the Gentoo Haskell overlay:
    layman -a haskell

Finally, we need to unmask the overlay (this does not apply if your system
is already running on the ~testing branch)::
    # Unmask ~testing versions for your arch:
    echo "*/*::haskell ~$(portageq envvar ARCH)" >> /etc/portage/package.accept_keywords

And here is the trick to speed up metadata resolution a bit.
If you happen to use ``eix-sync`` for rsyncs you might
like the following ``/etc/eix-sync.conf``::

    *
    @egencache --jobs="$(($(nproc) + 1))" --repo=haskell --update --update-use-local-desc

It basically means:

- sync overlays in layman list before the main tree sync

- generate metadata for haskell repo after main
  tree sync is done, using N+1 cores

Developer's corner
==================

Have a nice haskell-related ebuild to share with community?
Look at our `Developer's README`_!

.. _Developer's README: http://github.com/gentoo-haskell/gentoo-haskell/blob/master/projects/doc/README.rst

Loner's corner
==============

Alternatively if you really don't want to share any ebuilds (want to keep
outdated package versions, highly experimental things, publically unavailable
stuff, other reasons) that's also fine.

You can keep such ebuilds in your local overlay.

Here is a complete example of creating minimal overlay with a
single haskell ebuild from hackage::

    # create overlay and populate it (gentoo-generic):
    $ mkdir my-ovl
    $ cd    my-ovl
    $ mkdir metadata
    $ echo 'masters = gentoo' > metadata/layout.conf
    # register an overlay in /etc/portage/repos.conf:
    $ echo '[my-ovl]' >> /etc/portage/repos.conf
    $ echo "location = $(pwd)" >> /etc/portage/repos.conf
    
    # haskell-specific stuff
    $ hackport -p . update
    # DONE!
    
    # adding an example ebuild
    $ hackport merge hichi
    $ emerge -av1 hichi