mercurial: add package for crecord extension as optional dependency, include by default in mercurialFull

pkgs/applications/version-management/mercurial/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchurl, python, makeWrapper, docutils, unzip, hg-git, dulwich
-, guiSupport ? false, tk ? null, curses
+, guiSupport ? false, tk ? null, hg-crecord ? null, curses
 , ApplicationServices }:
 
 let
@@ -36,6 +36,13 @@ stdenv.mkDerivation {
       WRAP_TK=" --set TK_LIBRARY \"${tk}/lib/${tk.libPrefix}\"
                 --set HG \"$out/bin/hg\"
                 --prefix PATH : \"${tk}/bin\" "
+    '') + (stdenv.lib.optionalString (hg-crecord != null)
+    ''
+      mkdir -p $out/etc/mercurial
+      cat >> $out/etc/mercurial/hgrc << EOF
+      [extensions]
+      crecord=${hg-crecord}/${python.sitePackages}/crecord
+      EOF
     '') +
     ''
       for i in $(cd $out/bin && ls); do

pkgs/top-level/all-packages.nix

@@ -11934,7 +11934,7 @@ let
     guiSupport = false; # use mercurialFull to get hgk GUI
   };
 
-  mercurialFull = appendToName "full" (pkgs.mercurial.override { guiSupport = true; });
+  mercurialFull = appendToName "full" (pkgs.mercurial.override { inherit (pythonPackages) hg-crecord; guiSupport = true; });
 
   merkaartor = callPackage ../applications/misc/merkaartor { };
 

pkgs/top-level/python-packages.nix

@@ -5720,6 +5720,34 @@ let
   };
 
 
+  hg-crecord = buildPythonPackage rec {
+    rev = "5cfaabfe9cb9f0a0d6837956d73127f290a213be";
+    name = "hg-crecord-${rev}";
+    disabled = isPy3k;
+
+    src = pkgs.fetchurl {
+      url = "https://bitbucket.org/edgimar/crecord/get/${builtins.substring 0 12 rev}.tar.gz";
+      sha256 = "02003fa5620ec40a5ad0d7cede2e65c2cb398a7fe4e1ee26bd3396a87d63ad35";
+    };
+    
+    # crecord comes as just a bare directory
+    configurePhase = " ";
+    buildPhase = "${python.executable} -m compileall crecord";
+    installPhase = ''
+      mkdir -p $out/${python.sitePackages}
+      cp -Lr crecord $out/${python.sitePackages}/
+    '';
+
+    # there ain't none
+    doCheck = false;
+    
+    meta = {
+      description = "Mercurial extension for selecting graphically which files/hunk/lines to commit";
+      homepage = https://bitbucket.org/edgimar/crecord;
+    };
+  };
+
+
   docutils = buildPythonPackage rec {
     name = "docutils-0.12";