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spacemacs/layers/+completion
syl20bnr 95699ee61c core: add layer shadowing system
Layers can now declare in their layers.el file that they shadow one or more
layers using the following functions:

- configuration-layer/shadow-layers
- configuration-layer/shadow-layer

Those function are commutative so:
    (configuration-layer/shadow-layer 'layer1 'layer2)
is the same as
    (configuration-layer/shadow-layer 'layer2 'layer1)
and means that
layer1 shadows layer2
and
layer2 shadows layer1

The typical use-case is helm and ivy layers. Helm shadows the ivy layer and
Ivy shadows the helm layer.

Shadowing is sensitive to the order of declaration of layers in the dotfile,
for instance:

    (setq dotspacemacs-configuration-layers '(
      helm
      ivy
     ))

means that ivy shadows helm so helm layer is effectively ignored,
whereas

    (setq dotspacemacs-configuration-layers '(
      ivy
      helm
     ))

means that helm shadows ivy so ivy layer is effectively ignored.

This mechanism can be turned off using the :can-shadow keyword:

    (setq dotspacemacs-configuration-layers '(
      ivy
      (helm :can-shadow nil)
     ))

means that both ivy and helm layers will be installed (not recommended in this
case)

Note that the `:can-shadow` mechanism will be fully implemented in a next
commit.
2017-09-21 23:56:09 -04:00
..
auto-completion yasnippet: fix check for dotspacemacs-directory-snippets-dir 2017-08-27 22:44:18 -04:00
helm core: add layer shadowing system 2017-09-21 23:56:09 -04:00
ivy core: add layer shadowing system 2017-09-21 23:56:09 -04:00