Use symbol plists instead of internal variables

More in line with Emacs' built-in practice of storing a variable's
standard-value in a symbol property of the same name, with the added
benefit of less global state.

bin/doom

@@ -104,7 +104,7 @@
                 (save-match-data
                   (cl-loop for env
                            in (cl-set-difference process-environment
-                                                 doom--initial-process-environment
+                                                 (get 'process-environment 'initial-value)
                                                  :test #'equal)
                            if (string-match "^\\([a-zA-Z0-9_]+\\)=\\(.+\\)$" env)
                            concat (format "%s=%s \\\n"

core/autoload/sandbox.el

@@ -60,8 +60,7 @@
          forms
        `(progn
           ;; doom variables
-          (setq doom--initial-load-path load-path
+          (setq doom-debug-p t
-                doom-debug-p t
                 doom-emacs-dir ,doom-emacs-dir
                 doom-cache-dir ,(expand-file-name "cache/" doom-sandbox-dir)
                 doom-etc-dir   ,(expand-file-name "etc/" doom-sandbox-dir))
@@ -74,8 +73,8 @@
                 after-init-time nil
                 init-file-debug doom-debug-p
                 noninteractive nil
-                process-environment ',doom--initial-process-environment
+                process-environment (get 'process-environment 'initial-value)
-                exec-path ',doom--initial-exec-path
+                exec-path (get 'exec-path 'initial-value)
                 load-path ',load-path
                 user-init-file load-file-name)
           ;; package.el

core/cli/env.el

@@ -123,7 +123,7 @@ default, on Linux, this is '$SHELL -ic /usr/bin/env'. Variables in
          (let ((blacklist (remq nil (append blacklist doom-env-blacklist)))
                (whitelist (remq nil (append whitelist doom-env-whitelist))))
            (insert "(")
-           (dolist (env doom--initial-process-environment)
+           (dolist (env (get 'process-environment 'initial-value))
              (catch 'skip
                (let* ((var  (car (split-string env "=")))
                       (pred (doom-rpartial #'string-match-p var)))

core/core-packages.el

@@ -477,7 +477,7 @@ elsewhere."
   (when built-in
     (when (and (not ignore)
                (equal built-in '(quote prefer)))
-      (setq built-in `(locate-library ,(symbol-name name) nil doom--initial-load-path)))
+      (setq built-in `(locate-library ,(symbol-name name) nil (get 'load-path 'initial-value))))
     (plist-delete! plist :built-in)
     (plist-put! plist :ignore built-in))
   `(let* ((name ',name)

core/core.el

@@ -28,6 +28,15 @@ envvar will enable this at startup.")
 (defconst IS-WINDOWS (memq system-type '(cygwin windows-nt ms-dos)))
 (defconst IS-BSD     (or IS-MAC (eq system-type 'berkeley-unix)))
 
+;; Ensure Doom's core libraries are visible for loading
+(add-to-list 'load-path (file-name-directory load-file-name))
+
+;; Remember these variables' initial values, so we can safely reset them at a
+;; later time, or consult them without fear of contamination.
+(dolist (var '(exec-path load-path process-environment))
+  (unless (get var 'initial-value)
+    (put var 'initial-value (default-value var))))
+
 ;; Unix tools look for HOME, but this is normally not defined on Windows.
 (when (and IS-WINDOWS (null (getenv-internal "HOME")))
   (setenv "HOME" (getenv "USERPROFILE"))
@@ -178,9 +187,6 @@ users).")
 ;;
 ;;; Core libraries
 
-;; Ensure Doom's core libraries are visible for loading
-(add-to-list 'load-path doom-core-dir)
-
 ;; Just the... bear necessities~
 (require 'subr-x)
 (require 'cl-lib)
@@ -467,7 +473,7 @@ If this is a daemon session, load them all immediately instead."
 If RETURN-P, return the message as a string instead of displaying it."
   (funcall (if return-p #'format #'message)
            "Doom loaded %d packages across %d modules in %.03fs"
-           (- (length load-path) (length doom--initial-load-path))
+           (- (length load-path) (length (get 'load-path 'initial-value)))
            (if doom-modules (hash-table-count doom-modules) 0)
            (or doom-init-time
                (setq doom-init-time
@@ -537,10 +543,6 @@ TRIGGER-HOOK is a list of quoted hooks and/or sharp-quoted functions."
 ;;
 ;;; Bootstrapper
 
-(defvar doom--initial-exec-path exec-path)
-(defvar doom--initial-load-path load-path)
-(defvar doom--initial-process-environment process-environment)
-
 (defun doom-initialize (&optional force-p)
   "Bootstrap Doom, if it hasn't already (or if FORCE-P is non-nil).
 
@@ -573,9 +575,8 @@ to least)."
 
     ;; Reset as much state as possible, so `doom-initialize' can be treated like
     ;; a reset function. e.g. when reloading the config.
-    (setq-default exec-path doom--initial-exec-path
+    (dolist (var '(exec-path load-path process-environment))
-                  load-path doom--initial-load-path
+      (set-default var (get var 'initial-value)))
-                  process-environment doom--initial-process-environment)
 
     ;; Doom caches a lot of information in `doom-autoloads-file'. Module and
     ;; package autoloads, autodefs like `set-company-backend!', and variables