chore(treewide): s/\(extraModules\)Dir/\1Path/g

to accord with the names of module-path-related special arguments.

In `default.nix`, alias `extraModulesDir` to `extraModulesPath` for
backward compatibility.

Author: tomeon

default.nix

@@ -33,14 +33,17 @@ let
 in
 rec {
   # Folder that contains all the extra modules
-  extraModulesDir = toString ./extra;
+  extraModulesPath = toString ./extra;
+
+  # Alias for backward compatibility.
+  extraModulesDir = extraModulesPath;
 
   # Get the modules documentation from an empty evaluation
   modules-docs =
     (eval {
       configuration = {
         # Load all of the extra modules so they appear in the docs
-        imports = importTree extraModulesDir;
+        imports = importTree extraModulesPath;
       };
     }).config.modules-docs;
 

nix/importTOML.nix

@@ -7,14 +7,14 @@ let
       dir = toString (builtins.dirOf file);
       data = builtins.fromTOML (builtins.readFile file);
 
-      extraModulesDir = toString ../extra;
-      extraModules = builtins.readDir extraModulesDir;
+      extraModulesPath = toString ../extra;
+      extraModules = builtins.readDir extraModulesPath;
 
       importModule =
         str:
         let
           repoFile = "${dir}/${str}";
-          extraFile = "${extraModulesDir}/${builtins.replaceStrings [ "." ] [ "/" ] str}.nix";
+          extraFile = "${extraModulesPath}/${builtins.replaceStrings [ "." ] [ "/" ] str}.nix";
         in
         # First try to import from the user's repository
         if lib.hasPrefix "./" str || lib.hasSuffix ".nix" str || lib.hasSuffix ".toml" str then