git-annex: 5.20140421

installing git-annex with cabal-install is quite long and requires to install
some heavy packages. It also has several external lib dependencies and needs a
few configuration flags to build so it is quite difficult to install too.
This formula should make it easy and quick to install with a bottle.

The huge number of haskell dependencies is built within the formula and statically
linked to git-annex. The haskell libraries built are discarded - cabal-install
should be used instead of this package in order to keep them.

Formula/git-annex.rb

@@ -0,0 +1,53 @@
+require "formula"
+require "language/haskell"
+
+class GitAnnex < Formula
+  include Language::Haskell::Cabal
+
+  homepage "https://git-annex.branchable.com/"
+  url "http://hackage.haskell.org/package/git-annex-5.20140421/git-annex-5.20140421.tar.gz"
+  sha1 "f818164eaddf2887a15c0c4c745a1cb8174152dc"
+
+  depends_on "gcc" => :build
+  depends_on "ghc" => :build
+  depends_on "cabal-install" => :build
+  depends_on "pkg-config" => :build
+  depends_on "gsasl"
+  depends_on "libidn"
+  depends_on "gnutls"
+  depends_on "gmp"
+
+  def install
+    cabal_sandbox do
+      cabal_install_tools "alex", "happy", "c2hs"
+      # gcc required to build gnuidn
+      cabal_install "--with-gcc=#{Formula["gcc"].bin}/gcc-4.8", "--only-dependencies"
+      cabal_install "--prefix=#{prefix}"
+    end
+    system "make", "git-annex.1", "git-annex-shell.1"
+    man1.install "git-annex.1", "git-annex-shell.1"
+  end
+
+  test do
+    # make sure git can find git-annex
+    ENV.prepend_path 'PATH', bin
+    # create a first git repository with an annex
+    mkdir "my_annex" do
+      system "git", "init"
+      system "git", "annex", "init", "my_annex"
+      cp bin/"git-annex", "bigfile"
+      system "git", "annex", "add", "bigfile"
+      system "git", "commit", "-am", "big file added"
+      assert File.symlink? "bigfile"
+    end
+    # and propagate its content to another
+    system "git", "clone", "my_annex", "my_annex_clone"
+    Dir.chdir "my_annex_clone" do
+      assert (not File.file? "bigfile")
+      system "git", "annex", "get", "bigfile"
+      assert File.file? "bigfile"
+    end
+    # make test files writable so homebrew can drop them
+    chmod_R 0777, testpath
+  end
+end