Allow custom delete-region', insert' functions

Make it possible to specify which functions are used to delete the
region and insert text.

This is needed to get Meow to work with modes like Vterm, that define
their own `delete-region' and `insert' functions, without massive code
duplication.

meow-beacon.el

@@ -500,7 +500,7 @@ The recorded kmacro will be applied to all cursors immediately."
                   (delete-overlay ov)))))))
 
 (defun meow--beacon-delete-region ()
-  (delete-region (region-beginning) (region-end)))
+  (funcall meow--delete-region-function (region-beginning) (region-end)))
 
 (defun meow-beacon-kill-delete ()
   "Delete all selections.

meow-command.el

@@ -275,7 +275,7 @@ This command supports `meow-selection-command-fallback'."
         (t
          (meow--prepare-region-for-kill)
          (let ((s (buffer-substring-no-properties (region-beginning) (region-end))))
-           (delete-region (region-beginning) (region-end))
+           (funcall meow--delete-region-function (region-beginning) (region-end))
            (kill-append (meow--prepare-string-for-kill-append s) nil))))))))
 
 (defun meow-C-k ()
@@ -465,7 +465,7 @@ This command supports `meow-selection-command-fallback'."
     (save-mark-and-excursion
       (newline))
     ;; (save-mark-and-excursion
-    ;;   (insert "\n"))
+    ;;   (funcall meow--insert-function "\n"))
     (indent-according-to-mode)))
 
 (defun meow-open-above-visual ()
@@ -511,7 +511,7 @@ This command supports `meow-selection-command-fallback'."
   (when (meow--allow-modify-p)
     (setq this-command #'meow-change)
     (meow--with-selection-fallback
-     (delete-region (region-beginning) (region-end))
+     (funcall meow--delete-region-function (region-beginning) (region-end))
      (meow--switch-state 'insert)
      (setq-local meow--insert-pos (point)))))
 
@@ -540,19 +540,19 @@ This command supports `meow-selection-command-fallback'."
    (let ((select-enable-clipboard meow-use-clipboard))
      (when (meow--allow-modify-p)
        (when-let ((s (string-trim-right (current-kill 0 t) "\n")))
-         (delete-region (region-beginning) (region-end))
+         (funcall meow--delete-region-function (region-beginning) (region-end))
          (set-marker meow--replace-start-marker (point))
-         (insert s))))))
+         (funcall meow--insert-function s))))))
 
 (defun meow-replace-char ()
   "Replace current char with selection."
   (interactive)
   (let ((select-enable-clipboard meow-use-clipboard))
     (when (< (point) (point-max))
       (when-let ((s (string-trim-right (current-kill 0 t) "\n")))
-        (delete-region (point) (1+ (point)))
+        (funcall meow--delete-region-function (point) (1+ (point)))
         (set-marker meow--replace-start-marker (point))
-        (insert s)))))
+        (funcall meow--insert-function s)))))
 
 (defun meow-replace-save ()
   (interactive)
@@ -566,12 +566,12 @@ This command supports `meow-selection-command-fallback'."
                            (meow--prepare-region-for-kill)
                            (buffer-substring-no-properties (region-beginning) (region-end)))))
                 (progn
-                  (delete-region (region-beginning) (region-end))
+                  (funcall meow--delete-region-function (region-beginning) (region-end))
                   (set-marker meow--replace-start-marker (point))
-                  (insert s)
+                  (funcall meow--insert-function s)
                   (kill-new old)))
             (set-marker meow--replace-start-marker (point))
-            (insert s)))))))
+            (funcall meow--insert-function s)))))))
 
 (defun meow-replace-pop ()
   "Like `yank-pop', but for `meow-replace'.
@@ -599,9 +599,9 @@ For custom commands, see also the user option
         (message "`meow-replace-pop': Reached end of kill ring"))
       (let ((txt (string-trim-right (current-kill meow--replace-pop-index t)
                                     "\n")))
-        (delete-region meow--replace-start-marker (point))
+        (funcall meow--delete-region-function meow--replace-start-marker (point))
         (set-marker meow--replace-start-marker (point))
-        (insert txt))))
+        (funcall meow--insert-function txt))))
   (setq this-command 'meow-replace-pop))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -1748,8 +1748,8 @@ This command is a replacement for built-in `kmacro-end-macro'."
          (region-str (when (region-active-p) (buffer-substring-no-properties rbeg rend)))
          (sel-str (meow--second-sel-get-string))
          (next-marker (make-marker)))
-    (when region-str (delete-region rbeg rend))
-    (when sel-str (insert sel-str))
+    (when region-str (funcall meow--delete-region-function rbeg rend))
+    (when sel-str (funcall meow--insert-function sel-str))
     (move-marker next-marker (point))
     (meow--second-sel-set-string (or region-str ""))
     (when (overlayp mouse-secondary-overlay)

meow-util.el

@@ -414,7 +414,7 @@ Looks up the state in meow-replace-state-name-list"
   (when (or (member this-command meow-grab-fill-commands)
             (member meow--keypad-this-command meow-grab-fill-commands))
     (when-let ((s (meow--second-sel-get-string)))
-      (insert s))))
+      (funcall meow--insert-function s))))
 
 (defun meow--parse-string-to-keypad-keys (str)
   (let ((strs (split-string str " ")))
@@ -531,12 +531,12 @@ that bound to DEF. Otherwise, return DEF."
    ((meow--second-sel-buffer)
     (with-current-buffer (overlay-buffer mouse-secondary-overlay)
       (goto-char (overlay-start mouse-secondary-overlay))
-      (delete-region (overlay-start mouse-secondary-overlay) (overlay-end mouse-secondary-overlay))
-      (insert string)))
+      (funcall meow--delete-region-function (overlay-start mouse-secondary-overlay) (overlay-end mouse-secondary-overlay))
+      (funcall meow--insert-function string)))
    ((markerp mouse-secondary-start)
     (with-current-buffer (marker-buffer mouse-secondary-start)
       (goto-char (marker-position mouse-secondary-start))
-      (insert string)))))
+      (funcall meow--insert-function string)))))
 
 (defun meow--second-sel-get-string ()
   (when (meow--second-sel-buffer)

meow-var.el

@@ -480,6 +480,17 @@ Use (setq meow-keypad-describe-keymap-function 'nil) to disable popup.")
 (defvar meow--kbd-goto-line "M-g g"
   "KBD macro for command `goto-line'.")
 
+(defvar meow--delete-region-function #'delete-region
+  "The function used to delete the selection.
+
+Allows support of modes that define their own equivalent of
+`delete-region'.")
+
+(defvar meow--insert-function #'insert
+  "The function used to insert text in Normal state.
+
+Allows support of modes that define their own equivalent of `insert'.")
+
 (defvar-local meow--indicator nil
   "Indicator for current buffer.")