Standardize M-RET/M-S-RET as an "add new item" key

modules/config/default/autoload/default.el

@@ -91,3 +91,22 @@ If ARG (universal argument), runs `compile' from the current directory."
   (interactive)
   (cond ((featurep! :completion ivy) (+ivy/tasks)
          (featurep! :completion helm) (+helm/tasks))))
+
+;;;###autoload
+(defun +default/newline-above ()
+  "Insert an indented new line before the current one."
+  (interactive)
+  (if (featurep 'evil)
+      (call-interactively 'evil-open-above)
+    (beginning-of-line)
+    (save-excursion (newline))
+    (indent-according-to-mode)))
+
+;;;###autoload
+(defun +default/newline-below ()
+  "Insert an indented new line after the current one."
+  (interactive)
+  (if (featurep 'evil)
+      (call-interactively 'evil-open-below)
+    (end-of-line)
+    (newline-and-indent)))

modules/config/default/config.el

@@ -147,7 +147,11 @@
   ;; Pressing it again will send you to the true bol. Same goes for C-e, except
   ;; it will ignore comments+trailing whitespace before jumping to eol.
   (map! :gi "C-a" #'doom/backward-to-bol-or-indent
-        :gi "C-e" #'doom/forward-to-last-non-comment-or-eol)
+        :gi "C-e" #'doom/forward-to-last-non-comment-or-eol
+        ;; Standardize the behavior of M-RET/M-S-RET as a "add new item
+        ;; below/above" key.
+        :gi [M-return]    #'+default/newline-below
+        :gi [M-S-return]  #'+default/newline-above)
 
   (if (featurep 'evil)
       (load! "+evil-bindings")