use-package ibuffer config, add casual-ibuffer

ibuffer was not required, so ibuffer-mode-map was void in init.el

init.el

@@ -90,11 +90,6 @@
 ;; turn off auto fill 
 (remove-hook 'text-mode-hook 'turn-on-auto-fill)
 
-
-;; ibuffer
-(global-set-key (kbd "C-x C-b") #'ibuffer)
-(keymap-unset ibuffer-mode-map "M-o" t)
-
 (use-package avy
   :config
   (global-set-key (kbd "C-'") 'avy-goto-char-2)
@@ -178,6 +173,7 @@
 (require 'init-flycheck nil nil)
 
 (require 'init-dired nil nil)
+(require 'init-ibuffer nil nil)
 (require 'init-help nil nil)
 (require 'init-consult nil nil)
 (require 'init-vc nil nil)

lisp/init-help.el

@@ -39,6 +39,13 @@
          calc-alg-map
          ("C-c t" . 'casual-calc-tmenu)))
 
+(use-package casual-ibuffer
+  :ensure (:source "MELPA")
+  :bind (:map
+	 ibuffer-mode-map
+	 ("C-c t" . 'casual-ibuffer-tmenu))
+  )
+
 (provide 'init-help)
 
 ;;; init-help.el ends here

lisp/init-ibuffer.el

@@ -0,0 +1,16 @@
+;;; init-ibuffer.el --- Builtin interactive buffer mode -*- lexical-binding: t -*-
+;;; Commentary:
+;;; Code:
+
+(use-package ibuffer
+  :ensure nil
+  :config
+  (global-set-key (kbd "C-x C-b") #'ibuffer)
+  ;; collision with switch-buffer
+  (keymap-unset ibuffer-mode-map "M-o" t)
+  )
+
+
+(provide 'init-ibuffer)
+
+;;; init-ibuffer.el ends here