merge #3428: nano: bump and add system-wide config

nixos/modules/module-list.nix

···
   ./programs/dconf.nix
   ./programs/environment.nix
   ./programs/info.nix
+  ./programs/nano.nix
   ./programs/screen.nix
   ./programs/shadow.nix
   ./programs/shell.nix

nixos/modules/programs/nano.nix

···
+{ config, lib, ... }:
+
+let
+  cfg = config.programs.nano;
+in
+
+{
+  ###### interface
+
+  options = {
+    programs.nano = {
+
+      nanorc = lib.mkOption {
+        type = lib.types.lines;
+        default = "";
+        description = ''
+          The system-wide nano configuration.
+          See <citerefentry><refentrytitle>nanorc</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+        '';
+        example = ''
+          set nowrap
+          set tabstospaces
+          set tabsize 4
+        '';
+      };
+    };
+  };
+
+  ###### implementation
+
+  config = lib.mkIf (cfg.nanorc != "") {
+    environment.etc."nanorc".text = cfg.nanorc;
+  };
+
+}

pkgs/applications/editors/nano/default.nix

···
 
 stdenv.mkDerivation (rec {
   pname = "nano";
-  version = "2.3.2";
+  version = "2.3.6";
 
   name = "${pname}-${version}";
 
   src = fetchurl {
     url = "mirror://gnu/nano/${name}.tar.gz";
-    sha256 = "1s3b21h5p7r8xafw0gahswj16ai6k2vnjhmd15b491hl0x494c7z";
+    sha256 = "a74bf3f18b12c1c777ae737c0e463152439e381aba8720b4bc67449f36a09534";
   };
 
   buildInputs = [ ncurses gettext ];
+
+  configureFlags = "sysconfdir=/etc";
 
   meta = {
     homepage = http://www.nano-editor.org/;