Add wrap-region and modify expand-region to match

init.el

@@ -944,7 +944,10 @@ See also `crux-reopen-as-root-mode'."
   (exec-path-from-shell-initialize))
 
 (setup (:straight expand-region)
-  (:+key "C-=" #'er/expand-region))
+  (:also-load +expand-region)
+  (:option expand-region-fast-keys-enabled nil)
+  (:+key "C-=" #'er/expand-region
+         "C--" #'+er/contract-or-negative-argument))
 
 (setup (:straight (fill-sentences-correctly
                    :host github
@@ -1303,6 +1306,19 @@ See also `crux-reopen-as-root-mode'."
            whitespace-cleanup-mode-only-if-initially-clean nil)
   (global-whitespace-cleanup-mode +1))
 
+(setup (:straight wrap-region)
+  (:require wrap-region)
+  (wrap-region-add-wrappers
+   '(("*" "*" nil org-mode)
+     ("~" "~" nil org-mode)
+     ("/" "/" nil org-mode)
+     ("=" "=" nil org-mode)
+     ("+" "+" nil org-mode)
+     ("_" "_" nil org-mode)
+     ("$" "$" nil (org-mode latex-mode))))
+  (:hook-into org-mode
+              latex-mode))
+
 (setup (:straight zoom-frm))
 
 (setup (:straight zzz-to-char)

lisp/+expand-region.el

@@ -0,0 +1,24 @@
+;;; +expand-region.el                                -*- lexical-binding: t; -*-
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+;; Because of `wrap-region', I can't use `expand-region-fast-keys-enabled'.  So
+;; instead of that, I'm adding this to the binding to C--, but I also want to be
+;; able to use the negative argument. So there's this.
+(defun +er/contract-or-negative-argument (arg)
+  "Contract the region if the last command expanded it.
+Otherwise, pass the ARG as a negative argument."
+  (interactive "p")
+  (cond ((memq last-command '(er/expand-region
+                              er/contract-region
+                              +er/contract-or-negative-argument))
+
+         (er/contract-region arg))
+        (t (call-interactively #'negative-argument))))
+
+(provide '+expand-region)
+;;; +expand-region.el ends here