Add cava, console-based Audio Visualizer for Alsa

pkgs/applications/audio/cava/default.nix

···
+{ stdenv, fetchgit, alsaLib, fftw }:
+
+stdenv.mkDerivation rec {
+  name = "cava-${version}";
+  version = "27dbdf47daae44c780db9998c760007b3bf63738";
+
+  buildInputs = [ alsaLib fftw ];
+
+  src = fetchgit {
+    url = "https://github.com/karlstav/cava";
+    rev = version;
+    sha256 = "1a61e2c869376276cf78e6446cd1cc7f96b3e378fa8bc0bc4c5ca81945429909";
+  };
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp cava $out/bin
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Console-based Audio Visualizer for Alsa";
+    homepage = https://github.com/karlstav/cava;
+    maintainers = with maintainers; [offline];
+    platforms = with platforms; linux;
+  };
+}

pkgs/top-level/all-packages.nix

···
   };
   funpidgin = carrier;
 
+  cava = callPackage ../applications/audio/cava { };
+
   cc1394 = callPackage ../applications/video/cc1394 { };
 
   cddiscid = callPackage ../applications/audio/cd-discid { };