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TAB has multiple key bindings in different conditions. I want to change the key binding for yas-expand from TAB to M-TAB. How can I do it? Basically I want TAB to run indent-for-tab-command in all conditions.

TAB runs the command indent-for-tab-command (found in global-map), which is an
interactive compiled Lisp function in ‘indent.el’.

TAB runs the command yas-expand (found in yas-minor-mode-map), which is an
alias
for ‘yas-expand-from-trigger-key’ in ‘yasnippet.el’.

It is bound to TAB, <tab>, <menu-bar> <YASnippet> <Expand trigger>.

my setup:

(defvar my-keys-minor-mode-map
  (let ((map (make-sparse-keymap)))
    (global-set-key (kbd "<tab>") 'indent-for-tab-command)
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    Have a look at the relevant portion in the source code as of 06/17/2021 (lines 679 and 680): github.com/joaotavora/yasnippet/blob/master/yasnippet.el#L679 After the yasnippet.el library loads, you can try removing those definitions with something like this: (define-key yas-minor-mode-map [(tab)] nil) and (define-key yas-minor-mode-map (kbd "TAB") nil) Then define a new keyboard assignment binding the variable yas-maybe-expand to your proposed M-TAB using the yas-minor-mode-map. I do not have an opportunity at the moment, however, to test that out ...
    – lawlist
    Commented Jun 17, 2021 at 19:26
  • 1
    ... continued ... I see that you will likely also have to modify the variable yas-keymap which is used while the snippet is expanding ... see the source code as of 06/17/2021 (line 423): github.com/joaotavora/yasnippet/blob/master/yasnippet.el#L423 There are a few ways to do that ....
    – lawlist
    Commented Jun 17, 2021 at 19:29
  • I have added (define-key yas-minor-mode-map [(tab)] nil); (define-key yas-minor-mode-map (kbd "TAB") nil); (define-key yas-minor-mode-map (kbd "M-TAB") 'yas-expand) and seems like it works but I have not done anything related to your second comments. Please have look when you have time
    – alper
    Commented Jun 18, 2021 at 8:37

1 Answer 1

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Per this question you can use:

(define-key yas-minor-mode-map [(tab)] nil)
(define-key yas-minor-mode-map (kbd "TAB") nil)

This worked for me (using use-package) with:

(use-package yasnippet
  :ensure
  :bind
  (:map yas-minor-mode-map
        ("C-'". yas-expand)
        ([(tab)] . nil)
        ("TAB" . nil))
  :config
  (yas-reload-all)
  (add-hook 'prog-mode-hook 'yas-minor-mode))

I remapped yas-expand to C-'.

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