How to enable a layer after initialization?

[togakangaroo]

I have my .spacemacs file synced via dropbox between my computers. I am starting a new job where I have a macbook. I want the osx layer there, but not on my linux machine.

I do have a mechanism already which lets me run a computer-specific emacs-lisp file during the user-init phase, but I'm not sure how to bootstrap a layer from a script (so without adding it to the layers list). Any ideas?

[bcc32]

The osx layer doesn't really do anything on Linux, you can just enable it unconditionally. (The package :toggle fields all check (spacemacs/system-is-mac))

[togakangaroo]

appreciate that, though to be honest I kinda want to know the answer more generally

[bcc32]

What I have done in the past is to use a backquoted list, something like:

  (setq-default
   ;; ...

   ;; List of configuration layers to load.
   dotspacemacs-configuration-layers
   `(
     ,@(if (executable-find "ruby") '(ruby))
    )

So it's not so much enabling a layer after initialization, just computing the layer list instead.