Unable to (re)map M-3 key binding to insert # character on UK Macbook Pro keyboard

[dubnde]

Description

The Mac UK keyboard uses M-3 binding to insert the # character. Spacemacs however has this mapped to select window number 3. This presents a challenge in inserting the # character so ubiquitous with C/C++ coding.

Also unable to unbind the key.

Should mention the keybinding works in plain old vanilla emacs

Reproduction guide

• Start Emacs
• Create a empty buffer
• Try insert # character on UK mac keyboard

Observed behaviour:
Jumps to window 3 or indicates no window 3 if less than three windows open

Expected behaviour:
insert # character at point.

System Info

• OS: darwin
• Emacs: 24.5.1
• Spacemacs: 0.105.18
• Spacemacs branch: develop (rev. edfc5de)
• Graphic display: t
• Distribution: spacemacs
• Editing style: vim
• Completion: helm
• Layers:

((auto-completion :variables auto-completion-enable-help-tooltip t auto-completion-enable-snippets-in-popup t auto-completion-return-key-behavior 'complete auto-completion-tab-key-behavior 'cycle :disabled-for shell)
 better-defaults
 (colors :variables colors-enable-rainbow-identifiers nil)
 cscope
 (c-c   :variables c-c  -enable-clang-support t auto-completion-enable-help-tooltip t c-c  -default-mode-for-headers 'c  -mode)
 emacs-lisp evil-cleverparens evil-commentary
 (evil-snipe :variables evil-snipe-enable-alternate-f-and-t-behaviors t)
 git github haskell html ibuffer javascript markdown
 (org :variables org-enable-github-support t)
 osx semantic
 (shell :variables shell-enable-smart-eshell t)
 shell-scripts spacemacs-helm spell-checking syntax-checking ruby version-control windows-scripts yaml)

[sooheon]

Worked for me:

(defun sooheon/post-init-window-numbering ()
  (let ((m window-numbering-keymap))
    (define-key m "\M-0" nil)
    (define-key m "\M-1" nil)
    (define-key m "\M-2" nil)
    (define-key m "\M-3" nil)
    (define-key m "\M-4" nil)
    (define-key m "\M-5" nil)
    (define-key m "\M-6" nil)
    (define-key m "\M-7" nil)
    (define-key m "\M-8" nil)
    (define-key m "\M-9" nil)
    (define-key m (kbd "s-1") 'select-window-1)
    (define-key m (kbd "s-2") 'select-window-2)
    (define-key m (kbd "s-3") 'select-window-3)
    (define-key m (kbd "s-4") 'select-window-4)
    (define-key m (kbd "s-5") 'select-window-5)
    (define-key m (kbd "s-6") 'select-window-6)
    (define-key m (kbd "s-7") 'select-window-7)
    (define-key m (kbd "s-8") 'select-window-8)
    (define-key m (kbd "s-9") 'select-window-9))
  (evil-leader/set-key
    "0" nil "1" nil "2" nil "3" nil "4" nil
    "5" nil "6" nil "7" nil "8" nil "9" nil))

[dubnde]

@sooheon I ended up using the s-3 to insert the # character. I like your approach better though. Especially that I use the SPC n to select window n.

Tried it and thanks to Emacs question - hash key managed to get the workaround going after adding the bindings below.

(defun setup-mac-meta-keys ()
  (spacemacs/toggle-maximize-frame-on)
  (let ((m window-numbering-keymap))
    ;; On UK MBP keyboards, META key is used to insert certain characters clear the key
    (define-key m "\M-0" nil)
    (define-key m "\M-1" nil)
    (define-key m "\M-2" nil)
    (define-key m "\M-3" nil)
    (define-key m "\M-4" nil)
    (define-key m "\M-5" nil)
    (define-key m "\M-6" nil)
    (define-key m "\M-7" nil)
    (define-key m "\M-8" nil)
    (define-key m "\M-9" nil)

    ;; http://stackoverflow.com/questions/3977069/emacs-question-hash-key
    (global-set-key (kbd "M-2") '(lambda () (interactive) (insert "€")))
    (global-set-key (kbd "M-3") '(lambda () (interactive) (insert "#")))
    (define-key isearch-mode-map (kbd "M-3")
      '(lambda ()
         (interactive)
         (isearch-process-search-char ?\#)))))

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