Factor out kconf generator into lib/default.nix.

This should get rid of the duplication already marked with XXX and of course
should make the machine-specific configuration way easier to read.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/default.nix b/lib/default.nix
new file mode 100644
index 00000000..95f4f39f
--- /dev/null
+++ b/lib/default.nix
@@ -0,0 +1,17 @@
+with import <nixpkgs> {};
+
+with pkgs.lib;
+
+{
+  generateKConf = exprs: let
+    isNumber = c: elem c ["0" "1" "2" "3" "4" "5" "6" "7" "8" "9"];
+    mkValue = val:
+      if val == "" then "\"\""
+      else if val == "y" || val == "m" || val == "n" then val
+      else if all isNumber (stringToCharacters val) then val
+      else if substring 0 2 val == "0x" then val
+      else "\"${val}\"";
+    mkConfigLine = key: val: "${key}=${mkValue val}";
+    mkConf = cfg: concatStringsSep "\n" (mapAttrsToList mkConfigLine cfg);
+  in pkgs.writeText "generated.kconf" (mkConf exprs);
+}