I've decided to try out yasnippet recently, and while it seems to work for me, I have an issue with how it handles comments. I've set my trigger key to SPC, which causes unnecessary snippet expansion in comments (and strings).

It seems that yasnippet has a predefined condition to avoid expansion in such cases in yas-not-string-or-comment-condition, but it causes the trigger key to do nothing rather than falling back to its original behavior, namely self-insert-command. After checking whether setting yas-buffer-local-condition to yas-not-string-or-comment-condition solves the problem for me, I attempted to wrap the function that's bound to trigger keys (yas-expand-from-trigger-key) with advice that falls back to running self-insert-command, but that fails since I don't have access to the key that was pressed.

Has anyone ran into this issue (I wasn't able to find any questions about this here, or in github issues for yasnippet)?

1 Answer 1



This is the recommended way, but unfortunately it can't work in my Emacs, I don't know why, but you could try it:

(define-key yas-minor-mode-map (kbd "SPC") yas-maybe-expand)

Edit after a few months later: this issue has been fixed, see this issue if you're insterested in.

After digging into the source code a bit, I find that below settings could help:

(setq yas-buffer-local-condition yas-not-string-or-comment-condition)
(define-key yas-minor-mode-map (kbd "SPC") 'yas-expand)  ; assume you use this
(setq yas-fallback-behavior 'call-other-command)         ; default is 'return-nil

But it says yas-fallback-behavior is obsolete, and yas-maybe-expand should be used instead, which I haven't figured out how to yet :(

P.S. There is a github issue about this.

  • Thanks, it seems to work. Here's the related commit for my config file: github.com/DoMiNeLa10/.emacs.d/commit/…. I'll give you the bounty and accept the question once I'm able to.
    – user12563
    Commented Dec 26, 2018 at 21:49
  • So yas-maybe-expand also doesn't work for you? Sounds like a bug then.
    – whatacold
    Commented Dec 27, 2018 at 9:56

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