feat(nix): add keys enum to global cfg

INSTALL.md

@@ -102,21 +102,24 @@ pass:
 * A string to copy the config from a theme in `themes/` with said name
   (**name**, e.g `"cherry"`).
 * An attribute tree with the same names as the config file, e.g:
+
 ```nix
-{
+with config.lidm.keysEnum; {
     strings = {
         f_poweroff = "custom_poweroff";
-        # etc
     };
+
     behavior = {
         include_defshell = true;
         source = [
             "path1"
             "path2"
         ];
-        # etc
     };
-    # etc
+
+    functions = { poweroff = F1; };
+
+    # etc...
 };
 ```
 

assets/pkg/nix/get-cfg-file.nix

@@ -10,11 +10,14 @@ let
     keys-h-file = builtins.readFile "${src}/include/keys.h";
   };
 in
-builtins.toFile "lidm.conf" (
-  if builtins.isString cfg then
-    builtins.readFile "${src}/themes/${cfg}.ini"
-  else if builtins.isAttrs cfg then
-    maker.make cfg
-  else
-    builtins.throw "invalid cfg type, expected str or attrs"
-)
+{
+  inherit maker;
+  file = builtins.toFile "lidm.conf" (
+    if builtins.isString cfg then
+      builtins.readFile "${src}/themes/${cfg}.ini"
+    else if builtins.isAttrs cfg then
+      maker.make cfg
+    else
+      builtins.throw "invalid cfg type, expected str or attrs"
+  );
+}

assets/pkg/nix/lidm.nix

@@ -5,7 +5,7 @@
   ...
 }:
 let
-  cfg-file =
+  get-cfg =
     if config.cfg != null then
       import ./get-cfg-file.nix {
         inherit lib;
@@ -13,6 +13,8 @@ let
       }
     else
       null;
+  cfg-file = get-cfg.file;
+  maker = get-cfg.maker;
 in
 pkgs.stdenv.mkDerivation rec {
   pname = "lidm";
@@ -41,4 +43,8 @@ pkgs.stdenv.mkDerivation rec {
   fixupPhase = ''
     rm -rf $out/etc
   '';
+
+  passthru = {
+    keysEnum = maker.keys-enum;
+  };
 }

assets/pkg/nix/module.nix

@@ -30,15 +30,23 @@ let
   };
 in
 {
-  options.services.lidm.config = lib.mkOption {
-    type =
-      with lib.types;
-      oneOf [
-        str
-        attrs
-      ];
-    default = { };
-    description = "Config options for lidm | Either attr tree or name of bundled themes";
+  options = {
+    lidm.keysEnum = lib.mkOption {
+      type = with lib.types; attrs;
+      default = lidm.passthru.keysEnum;
+      readOnly = true;
+      description = "Keys enum constants";
+    };
+    services.lidm.config = lib.mkOption {
+      type =
+        with lib.types;
+        oneOf [
+          str
+          attrs
+        ];
+      default = { };
+      description = "Config options for lidm | Either attr tree or name of bundled themes";
+    };
   };
   config = {
     services.displayManager.defaultSession = "lidm";