refactor: register :core & :user as virtual modules

...that are always enabled. This way, the module API treats them as any
other module.

This also changes doom-module-load-path. If supplied directories,
doom-user-dir will not be the CAR of its return value. If no dirs are
supplied, then doom-core-dir and doom-user-dir are included (and will
always be the first two items in the returned list).

.doomrc

@@ -19,7 +19,7 @@
 
 (after! doom-cli-make
   ;;; Codeowners
-  (dolist (path (cdr (doom-module-load-path (list doom-modules-dir))))
+  (dolist (path (doom-module-load-path (list doom-modules-dir)))
     ;; I will be the default owner for everything in the repo unless a later
     ;; match takes precedence.
     (add-to-list 'doom-make-codeowners "# The default owner(s) unless another takes precedence")

lisp/cli/autoloads.el

@@ -56,7 +56,7 @@ hoist buggy forms into autoloads.")
          (doom-autoloads--scan
           (append (doom-glob doom-core-dir "lib/*.el")
                   (cl-loop for dir
-                           in (append (cdr (doom-module-load-path 'all-p))
+                           in (append (doom-module-load-path doom-modules-dirs)
                                       (list doom-user-dir))
                            if (doom-glob dir "autoload.el") collect (car it)
                            if (doom-glob dir "autoload/*.el") append it)
@@ -198,8 +198,7 @@ hoist buggy forms into autoloads.")
          (generated-autoload-load-name (file-name-sans-extension file))
          (target-buffer (current-buffer))
          (module (doom-module-from-path file))
-         (module-enabled-p (and (or (memq (car module) '(:core :user))
-                                    (doom-module-p (car module) (cdr module)))
+         (module-enabled-p (and (doom-module-p (car module) (cdr module))
                                 (doom-file-cookie-p file "if" t))))
     (save-excursion
       (when module-enabled-p

lisp/cli/compile.el

@@ -41,7 +41,7 @@ and your private config files, respectively. To recompile your packages, use
               ;; Only compile Doom's modules
               (doom-rpartial #'file-in-directory-p doom-emacs-dir)
               ;; Omit `doom-user-dir', which is always first
-              (cdr (doom-module-load-path)))))
+              (doom-module-load-path))))
    recompile-p
    verbose-p))
 

lisp/doom-modules.el

@@ -246,23 +246,19 @@ If ENABLED-ONLY, return nil if the containing module isn't enabled."
 
 The list is in no particular order and its file paths are absolute. If
 MODULE-DIRS is non-nil, include all modules (even disabled ones) available in
-those directories. The first returned path is always `doom-user-dir'."
+those directories."
   (declare (pure t) (side-effect-free t))
-  (append (list doom-user-dir)
-          (if module-dirs
-              (mapcar (lambda (m) (doom-module-locate-path (car m) (cdr m)))
-                      (delete-dups
-                       (doom-files-in (if (listp module-dirs)
-                                          module-dirs
-                                        doom-modules-dirs)
-                                      :map #'doom-module-from-path
-                                      :type 'dirs
-                                      :mindepth 1
-                                      :depth 1)))
-            (delq
-             nil (cl-loop for (cat . mod) in (doom-module-list)
-                          collect (doom-module-get cat mod :path))))
-          nil))
+  (if module-dirs
+      (mapcar (lambda (m) (doom-module-locate-path (car m) (cdr m)))
+              (delete-dups
+               (doom-files-in module-dirs
+                              :map #'doom-module-from-path
+                              :type 'dirs
+                              :mindepth 1
+                              :depth 1)))
+    (delq
+     nil (cl-loop for (cat . mod) in (cddr (doom-module-list))
+                  collect (doom-module-get cat mod :path)))))
 
 (defun doom-module-mplist-map (fn mplist)
   "Apply FN to each module in MPLIST."
@@ -327,7 +323,7 @@ they're enabled, and in lexicographical order.
 
 If ALL-P is `real', only return *real"
   (if all-p
-      (mapcar #'doom-module-from-path (cdr (doom-module-load-path 'all)))
+      (mapcar #'doom-module-from-path (doom-module-load-path doom-modules-dirs))
     (hash-table-keys doom-modules)))
 
 
@@ -584,5 +580,14 @@ CATEGORY and MODULE can be omitted When this macro is used from inside a module
                        category module flag (file!)))))
        t))
 
+
+;;
+;;; Defaults
+
+;; Register Doom's two virtual module categories, representing Doom's core and
+;; the user's config; which are always enabled.
+(doom-module-set :core nil :path doom-core-dir)
+(doom-module-set :user nil :path doom-user-dir)
+
 (provide 'doom-modules)
 ;;; doom-modules.el ends here

lisp/lib/packages.el

@@ -163,11 +163,7 @@ each package."
            (ignore-errors (intern (cadr module)))
            current-prefix-arg)))
   (mapc (lambda! ((cat . mod))
-          (if-let (packages-file
-                   (pcase cat
-                     (:user (car (doom-glob doom-user-dir "packages.el")))
-                     (:core (car (doom-glob doom-core-dir "packages.el")))
-                     (_ (doom-module-locate-path cat mod "packages.el"))))
+          (if-let (packages-file (doom-module-locate-path cat mod "packages.el"))
               (with-current-buffer
                   (or (get-file-buffer packages-file)
                       (find-file-noselect packages-file))