lib/options.mkEnable: Init

This is the first required step into the direction of removing the
`modules/common.nix` file.

1 files changed, 23 insertions, 3 deletions

diff --git a/lib/default.nix b/lib/default.nix
index d84ac5e2..1cdbf936 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -7,7 +7,7 @@
 #
 # You should have received a copy of the License along with this program.
 # If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
-{lib}: let
+{lib}: rec {
   /*
   Converts `number` from a binary number to a decimal one.
 
@@ -101,6 +101,26 @@
     else if power > 0
     then (base * (pow base (power - 1)))
     else builtins.throw "Negative powers are not supported";
-in {
-  inherit binaryToDecimal idFromString pow;
+
+  options = {
+    /*
+    Generate an enable option definition, that defaults to true.
+
+    This conveniently allows the composition of a “common” module set.
+
+    # Type
+
+    mkEnable :: String -> AttrSet
+
+    # Arguments
+
+    name
+    : The name to use in the option description.
+    */
+    mkEnable = name:
+      (lib.mkEnableOption name)
+      // {
+        default = true;
+      };
+  };
 }