lib: add applyPrefixToAttrs

lib/default.nix

@@ -67,6 +67,7 @@ lib.fix (
       ;
 
     inherit (self.utils)
+      applyPrefixToAttrs
       concatNonEmptyLines
       emptyTable
       enableExceptInTests

lib/utils.nix

@@ -20,6 +20,23 @@ rec {
     "__empty" = null;
   };
 
+  /**
+    Add a prefix to the keys of an attrs.
+
+    # Example
+    ```nix
+    applyPrefixToAttrs "prefix_" { foo = 1; bar = 2; }
+    => { prefix_foo = 1; prefix_bar = 2; }
+    ```
+
+    # Type
+
+    ```
+    applyPrefixToAttrs :: String -> AttrSet -> AttrSet
+    ```
+  */
+  applyPrefixToAttrs = prefix: lib.mapAttrs' (n: lib.nameValuePair (prefix + n));
+
   /**
     Turn all the keys of an attrs into raw lua.
 

lib/vim-plugin.nix

@@ -113,7 +113,7 @@
                 extraPlugins = extraPlugins ++ [
                   (cfg.packageDecorator cfg.package)
                 ];
-                globals = lib.mapAttrs' (n: lib.nameValuePair (globalPrefix + n)) (cfg.settings or { });
+                globals = lib.nixvim.applyPrefixToAttrs globalPrefix (cfg.settings or { });
               }
               (lib.optionalAttrs (isColorscheme && (colorscheme != null)) {
                 colorscheme = lib.mkDefault colorscheme;

tests/lib-tests.nix

@@ -61,6 +61,17 @@ let
       expected = ''{ foo = "bar", qux = { 1, 2, 3 } }'';
     };
 
+    testApplyPrefixToAttrs = {
+      expr = lib.nixvim.applyPrefixToAttrs "prefix_" {
+        foo = 1;
+        bar = 2;
+      };
+      expected = {
+        prefix_foo = 1;
+        prefix_bar = 2;
+      };
+    };
+
     testToLuaObjectRawLua = {
       expr = lib.nixvim.toLuaObject { __raw = "<lua code>"; };
       expected = "<lua code>";