add gocode package

pkgs/development/tools/gocode/default.nix

@@ -0,0 +1,29 @@
+{ stdenv, lib, go, fetchurl, fetchgit, fetchhg, fetchbzr, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  name = "gocode";
+
+  src = import ./deps.nix {
+    inherit stdenv lib fetchgit fetchhg fetchbzr fetchFromGitHub;
+  };
+
+  buildInputs = [ go ];
+
+  buildPhase = ''
+    export GOPATH=$src
+    go build -v -o gocode github.com/nsf/gocode
+  '';
+
+  installPhase = ''
+    ensureDir $out/bin
+    mv gocode $out/bin
+  '';
+
+  meta = with lib; {
+    description = "An autocompletion daemon for the Go programming language";
+    homepage = https://github.com/nsf/gocode;
+    license = licenses.mit;
+    maintainers = with maintainers; [ cstrahan ];
+    platforms = platforms.unix;
+  };
+}

pkgs/development/tools/gocode/deps.nix

@@ -0,0 +1,27 @@
+{ stdenv, lib, fetchgit, fetchhg, fetchbzr, fetchFromGitHub }:
+
+let
+  goDeps = [
+    {
+      root = "github.com/nsf/gocode";
+      src = fetchFromGitHub {
+        owner = "nsf";
+        repo = "gocode";
+        rev = "9b760fdb16f18eafbe0cd274527efd2bd89dfa78";
+        sha256 = "0d1wl0x8jkaav6lcfzs70cr6gy0p88cbk5n3p19l6d0h9xz464ax";
+      };
+    }
+  ];
+
+in
+
+stdenv.mkDerivation rec {
+  name = "go-deps";
+
+  buildCommand =
+    lib.concatStrings
+      (map (dep: ''
+              mkdir -p $out/src/`dirname ${dep.root}`
+              ln -s ${dep.src} $out/src/${dep.root}
+            '') goDeps);
+}

pkgs/top-level/all-packages.nix

@@ -7494,6 +7494,8 @@ let
 
   numactl = callPackage ../os-specific/linux/numactl { };
 
+  gocode = callPackage ../development/tools/gocode { };
+
   gogoclient = callPackage ../os-specific/linux/gogoclient { };
 
   nss_ldap = callPackage ../os-specific/linux/nss_ldap { };