Add caps-lock package and add a toggle for it

[tuhdo]

caps-lock is a minor mode that when enabled, it behaves like you turned on Caps Lock. The package is here: http://elpa.gnu.org/packages/caps-lock.html

However, currently we cannot download packages from ELPA. However, given how small it is (only 23 lines of actual code) we can just include the file directly inside Spacemacs.

[tuhdo]

Why is it needed? Because many Emacs users (and even Vim) swapped Caps Lock for something Ctrl or Esc, and the pressing Cap Locks is less convenient. More importantly, in Emacs when you enable Caps Lock, it appends every key pressed with Shift. For example, with Caps Lock on, when you press C-a it becomes C-S-a and thus making many commands not usable. This minor mode solved that problem.

[syl20bnr]

It can be included as an extension, but I'm surprised that we cannot download any package from ELPA, the repository is not present in spacemacs ?

[tuhdo]

Yes, I have to add caps-lock package to dotspacemacs-additional-packages otherwise adding to my private layer package list won't download the package. Seems like a bug.

[syl20bnr]

wow that's strange, when you added it to your layer, are you sure you added an associated init function ?

[tuhdo]

Ah it turned out that I made a typo in my init function.

[syl20bnr]

I think that spacemacs should warn in the Messages buffer when it does not find any init function.

[TheBB]

@tuhdo Since it seems you have the code already, please make a PR for this or close this issue.

[github-actions]

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