Add "cask" package

pkgs/applications/editors/emacs-modes/cask/default.nix

@@ -0,0 +1,47 @@
+{ stdenv, fetchgit, emacs, python }:
+
+stdenv.mkDerivation rec {
+  name = "cask-0.7.2";
+
+  src = fetchgit {
+    url = "https://github.com/cask/cask.git";
+    rev = "8d667e1ce3f3aa817a7b996f02058b2441f83958";
+    sha256 = "08brrdyz7zsw134zwf4dyj6bj2glflszssfq8vya3mh01s38mfri";
+  };
+
+  buildInputs = [ emacs python ];
+
+  # byte-compiling emacs files automatically triggers cask's bootstrap
+  # mechanism, what we don't want.
+  dontBuild = true;
+
+  installPhase = ''
+    install -d "$out/share/emacs/site-lisp"
+    install cask*.el* "$out/share/emacs/site-lisp"
+
+    install -d "$out/bin"
+    install bin/cask "$out/bin"
+
+    # In order to work with cask's hard coded file paths (during bootstrap),
+    # we have to create these links.
+    ln -s "$out/share/emacs/site-lisp/"* "$out"
+
+    # This file disables cask's self-updating function.
+    touch "$out/.no-upgrade"
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Project management tool for Emacs";
+    longDescription =
+      ''
+        Cask is a project management tool for Emacs that helps automate the
+        package development cycle; development, dependencies, testing,
+        building, packaging and more. Cask can also be used to manage
+        dependencies for your local Emacs configuration.
+      '';
+    homepage = "https://github.com/cask/cask";
+    license = licenses.gpl3Plus;
+    platforms = platforms.all;
+    maintainers = [ maintainers.jgeerds ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -8653,6 +8653,8 @@ let
     writeGood = callPackage ../applications/editors/emacs-modes/writegood { };
 
     xmlRpc = callPackage ../applications/editors/emacs-modes/xml-rpc { };
+
+    cask = callPackage ../applications/editors/emacs-modes/cask { };
   };
 
   emacs24Packages = recurseIntoAttrs (emacsPackages emacs24 pkgs.emacs24Packages);