proj/gentoo: Initial commit

This commit represents a new era for Gentoo:
Storing the gentoo-x86 tree in Git, as converted from CVS.

This commit is the start of the NEW history.
Any historical data is intended to be grafted onto this point.

Creation process:
1. Take final CVS checkout snapshot
2. Remove ALL ChangeLog* files
3. Transform all Manifests to thin
4. Remove empty Manifests
5. Convert all stale $Header$/$Id$ CVS keywords to non-expanded Git $Id$
5.1. Do not touch files with -kb/-ko keyword flags.

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
X-Thanks: Alec Warner <antarus@gentoo.org> - did the GSoC 2006 migration tests
X-Thanks: Robin H. Johnson <robbat2@gentoo.org> - infra guy, herding this project
X-Thanks: Nguyen Thai Ngoc Duy <pclouds@gentoo.org> - Former Gentoo developer, wrote Git features for the migration
X-Thanks: Brian Harring <ferringb@gentoo.org> - wrote much python to improve cvs2svn
X-Thanks: Rich Freeman <rich0@gentoo.org> - validation scripts
X-Thanks: Patrick Lauer <patrick@gentoo.org> - Gentoo dev, running new 2014 work in migration
X-Thanks: Michał Górny <mgorny@gentoo.org> - scripts, QA, nagging
X-Thanks: All of other Gentoo developers - many ideas and lots of paint on the bikeshed

1 files changed, 61 insertions, 0 deletions

diff --git a/dev-haskell/semigroupoids/metadata.xml b/dev-haskell/semigroupoids/metadata.xml
new file mode 100644
index 000000000000..0b9dfed4ec37
--- /dev/null
+++ b/dev-haskell/semigroupoids/metadata.xml
@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<herd>haskell</herd>
+	<longdescription>
+		Provides a wide array of semigroupoids and operations for working with semigroupds.
+		
+		A Semigroupoid is a Category without the requirement of identity arrows for every object in the category.
+		
+		When working with comonads you often have the @\&lt;*\&gt;@ portion of an @Applicative@, but
+		not the @pure@. This was captured in Uustalu and Vene's \"Essence of Dataflow Programming\"
+		in the form of the @ComonadZip@ class in the days before @Applicative@. Apply provides a weaker invariant, but for the comonads used for data flow programming (found in the streams package), this invariant is preserved. Applicative function composition forms a semigroupoid.
+		
+		Similarly many structures are nearly a comonad, but not quite, for instance lists provide a reasonable 'extend' operation in the form of 'tails', but do not always contain a value.
+		
+		
+		Ideally the following relationships would hold:
+		
+		&gt; Traversable &lt;---- Foldable &lt;--- Functor ------&gt; Alt ---------&gt; Plus           Semigroupoid
+		&gt;      |               |            |                              |                  |
+		&gt;      v               v            v                              v                  v
+		&gt; Traversable1 &lt;--- Foldable1     Apply --------&gt; Applicative -&gt; Alternative      Category
+		&gt;                                   |               |              |                  |
+		&gt;                                   v               v              v                  v
+		&gt;                                 Bind ---------&gt; Monad -------&gt; MonadPlus          Arrow
+		&gt;
+		
+		Apply, Bind, and Extract give rise the Static, Kleisli and Cokleisli semigroupoids respectively.
+		
+		This lets us remove many of the restrictions from various monad transformers
+		as in many cases the binding operation or @\&lt;*\&gt;@ operation does not require them.
+		
+		Finally, to work with these weaker structures it is beneficial to have containers
+		that can provide stronger guarantees about their contents, so versions of 'Traversable'
+		and 'Foldable' that can be folded with just a 'Semigroup' are added.
+	</longdescription>
+	<use>
+		<flag name="comonad">You can disable the use of the `comonad` package using
+  `-f-comonad`. Disabling this is an unsupported configuration, but it may be
+  useful for accelerating builds in sandboxes for expert users. If disabled we
+  will not supply instances of `Comonad`</flag>
+		<flag name="containers">You can disable the use of the `containers` package
+  using `-f-containers`. Disabing this is an unsupported configuration, but it
+  may be useful for accelerating builds in sandboxes for expert users.</flag>
+		<flag name="contravariant">You can disable the use of the `contravariant`
+  package using `-f-contravariant`. Disabling this is an unsupported
+  configuration, but it may be useful for accelerating builds in sandboxes for
+  expert users. If disabled we will not supply instances of `Contravariant`</flag>
+		<flag name="distributive">You can disable the use of the `distributive`
+  package using `-f-distributive`. Disabling this is an unsupported
+  configuration, but it may be useful for accelerating builds in sandboxes for
+  expert users. If disabled we will not supply instances of `Distributive`</flag>
+		<flag name="tagged">You can disable the use of the `tagged` package
+  using `-f-tagged`. Disabing this is an unsupported
+  configuration, but it may be useful for accelerating builds in
+  sandboxes for expert users.</flag>
+	</use>
+	<upstream>
+		<remote-id type="github">ekmett/semigroupoids</remote-id>
+	</upstream>
+</pkgmetadata>