Refactor detection of native display-line-numbers

core/autoload/line-numbers.el

@@ -26,6 +26,8 @@ relative number of a line.
 Lisp programs can disable display of a line number of a particular
 buffer line by putting the display-line-numbers-disable text property
 or overlay property on the first visible character of that line.")
+;;;###autoload
+(put 'display-line-numbers 'nlinum t)
 
 ;;;###autoload
 (defcustom display-line-numbers-type t

core/core-ui.el

@@ -304,7 +304,7 @@ from the default."
 ;; Line number column. A faster (or equivalent, in the worst case) line number
 ;; plugin than `linum-mode'.
 (def-package! nlinum
-  :unless (boundp 'display-line-numbers)
+  :when (get 'display-line-numbers 'nlinum)
   :commands nlinum-mode
   :init
   (defvar doom-line-number-lpad 4
@@ -352,7 +352,7 @@ character that looks like a space that `whitespace-mode' won't affect.")
 
 ;; Fixes disappearing line numbers in nlinum and other quirks
 (def-package! nlinum-hl
-  :unless (boundp 'display-line-numbers)
+  :when (get 'display-line-numbers 'nlinum)
   :after nlinum
   :config
   ;; With `markdown-fontify-code-blocks-natively' enabled in `markdown-mode',
@@ -367,7 +367,7 @@ character that looks like a space that `whitespace-mode' won't affect.")
   (advice-add #'set-frame-font :after #'nlinum-hl-flush-all-windows))
 
 (def-package! nlinum-relative
-  :unless (boundp 'display-line-numbers)
+  :when (get 'display-line-numbers 'nlinum)
   :commands (nlinum-relative-mode nlinum-relative-on nlinum-relative-off)
   :config
   (setq nlinum-format " %d ")

core/packages.el

@@ -13,7 +13,7 @@
 (package! highlight-numbers)
 (package! highlight-escape-sequences
   :recipe (:fetcher github :repo "hlissner/highlight-escape-sequences"))
-(unless (boundp 'display-line-numbers)
+(unless (locate-library "display-line-numbers")
   (package! nlinum)
   (package! nlinum-hl)
   (package! nlinum-relative))