Adding x-cape keyboard mapping helper

pkgs/tools/X11/xcape/default.nix

@@ -0,0 +1,32 @@
+{stdenv, fetchurl, fetchgit, libX11, xproto, libXtst, xextproto, pkgconfig
+, inputproto, libXi}:
+let
+  s = rec {
+    baseName = "xcape";
+    version = "git-2013-05-30";
+    name = "${baseName}-${version}";
+  };
+  buildInputs = [
+    libX11 libXtst xproto xextproto pkgconfig inputproto libXi
+  ];
+in
+stdenv.mkDerivation {
+  inherit (s) name version;
+  inherit buildInputs;
+  src = fetchgit {
+    url = https://github.com/alols/xcape;
+    rev = "39aa08c5da354a8fe495eba8787a01957cfa5fcb";
+    sha256 = "1yh0vbaj4c5lflxm3d4xrfaric1lp0gfcyzq33bqphpsba439bmg";
+  };
+  preConfigure = ''
+    makeFlags="$makeFlags PREFIX=$out"
+  '';
+  meta = {
+    inherit (s) version;
+    description = ''A tool to have Escape and Control on a single key'';
+    license = stdenv.lib.licenses.gpl3 ;
+    inherit (s) url sha256;
+    maintainers = [stdenv.lib.maintainers.raskin];
+    platforms = stdenv.lib.platforms.linux;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -8745,6 +8745,8 @@ let
 
   xcalib = callPackage ../tools/X11/xcalib { };
 
+  xcape = callPackage ../tools/X11/xcape { };
+
   xchainkeys = callPackage ../tools/X11/xchainkeys { };
 
   xchat = callPackage ../applications/networking/irc/xchat { };