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Added header.
Removed cl-generic dependency which is not needed for current minimum version (or later) of Emacs.

`first` and `list-length` are aliases for `car` and `cl-list-length`
respectively. Using these aliases causes emacs to error with a `symbol's function
definition is void` error, but using their real names causes no error.

Replaced them with `car` and `length`.

Co-authored-by: Lucius Hu <1222865+lebensterben@users.noreply.github.com>

You can now export org files as asciidoc documents.

* Add Emacs Window Manager (EXWM) Layer

The time has come of SpacemacsOS

* set window manager name to EXWM

* update copyright notice

* start server when EXWM is active

When using EXWM, Emacs should be ready to receive clients but the final choice
should be the user's in their shell configuration.

* respect Spacemacs naming conventions and layer organization

* leave keyboard remapping to users

* add EXWM states for Evil

* add support for helm-exwm when helm is in use

* use both exwm-randr and exwm-systemtray

* set up workspaces to match displays by default

* use ido-config instead of the deprecated workaround

When using helm-exwm, its sources distinguish title and class automatically. It
is only necessary to keep the buffer name updated when the window title changes.
When using ido, rename differently for different applications.

* add bindings for common X keys

* use standard prefix commands where available

Spacemacs already has prefix commands for controlling windows.
These are directly available in exwm-state as well as in exwm-insert-state
through leader

* remove most keybindings as they are available directly in exwm-state

* enable exwm directly in the layer configuration

It is safe to enable it here as an existing window manager will simply fail with
a warning.

* add user-configurable variables for RandR and workspaces

By default, create as many workspaces as there are displays and assign them in
RandR order.

* fix naming convention for variables

* use helm for launching applications when possible

* fix conditional helm-exwm leader keys

* remove redundant function

EXWM provides the equivalent

* conform to naming convention for Spacemacs

* separate prefix commands into those for major mode and global

* remove all default bindings

* improve readability

* clean up bindings

* remove obsolete comments
Co-authored-by: M. Domenzain <luis.domenzain@parrot.com>

Ported from Doom

Private variables must use "--" after the prefix.

bind it to `spc r w`

bind it to `SPC x x`, not sure it's the right place but it's easy to invoke

Racket describe mode comes with its own keybinding (i.e. `q` for quit).
Additionally it contains links, so this PR binds `o` to `link-hint-open-link`
(`ace-link` does not support this mode)

The layer got broken due to some minor changes in the eaf package by the eaf
developers. This commit fixes the layer to a working state.

* core-customization: improved SAFE variable handling

- SAFE can either be a function or t.
  - When it's t, use a default validation function
    `(lambda (val) (validate-value val TYPE t))`
  - When it's a function, use the supplied function.

* Fixed bugs in go and groovy layer

In almost any cases, it's better to supply `t` instead of a function, to
`SAFE` argument of `spacemacs|defc`.

For example,
```elisp
 (spacemacs|defc go-use-gocheck-for-testing nil
   "If using gocheck for testing when running the tests -check.f will be used instead of -run to specify the test that will be ran. Gocheck is mandatory for testing suites."
  'boolean nil #'booleanp)
```

If its value is nil, it evaluate to `nil`, which means that `nil` is not
a safe value for `go-use-gocheck-for-testing` local variable.

But clearly it is.

* core-customization: improved SAFE variable handling

- Added a function `spacemacs-customization//get-variable-validator`.
  This function is designed to be used with `safe-local-variable`
  property of spacemacs custom variables.
  See details in the docstring.

```elisp
(put 'FOO 'safe-local-variable
     (apply-partially 'spacemacs-customization//get-variable-validator
                      'FOO))
```

- This is better than a lambda since `apply-partially` returns a compiled
  function. (Though the performace gain may be tiny.)
- This is better than simply calling `validate-value`, because it returns
  nil when value is nil. But sometimes nil is a valid value.
Co-authored-by: Lucius Hu <lebensterben@users.noreply.github.com>

With this fix it is now possible to select different backends in
different project using the directory variables mechanism of Emacs
(the file .dir-local.el)

and fix wrong declaration of go-mode hooks

- Labelled `go-backend` and `go-format-on-save` as safe local variable.
- Added local variable hooks of go mode:
  - `spacemacs//go-setup-backend`
  - `spacemacs//go-setup-eldoc`
  - `spacemacs//go-setup-format`

See: https://github.com/syl20bnr/spacemacs/issues/14653

And extend spacemacs|defc to allow setting
a :safe directive.

- Labelled `groovy-backend` as safe local variable.
- Added local variable hooks of groovy mode:
  - `spacemacs//groovy-setup-backend`
  - `spacemacs//groovy-setup-company`

See: https://github.com/syl20bnr/spacemacs/issues/14653

Eww was wrongly classified as web-service.
It can now be found under tools hence the global
binding was changed from `SPC a w e` to
`SPC a t e`.

Also I have removed parts of the documentation
still refering to this layer not being part of
Spacemacs.

This commit combines all changes from the above
mentioned fork from the original author.

All praise goes to dalanicolai.

A spacemacs layer that adds:
 - Improved spacemacs functionality to eww-mode
 - Evil keybindings to eww-mode (including eww-buffers/bookmarks/history-mode)
 - Improved eww buffer management with key bindings

* documentation formatting: Thu Apr 15 19:58:45 UTC 2021

* Built-in files auto-update: Thu Apr 15 19:57:01 UTC 2021

Fixes: vim layer key binding of "J" in dired mode #14614
https://github.com/syl20bnr/spacemacs/issues/14614

problem
The evil collection binds "J" to `dired-go-to-file`

It overrides the Spacemacs `helm` and `ivy` equivalent commands.
`spacemacs/helm-find-files' has fuzzy matching and other features
`spacemacs/counsel-find-file' has more `M-o' actions

And the `ivy` layer uses the `spacemacs/helm-find-files` command.

solution
Move the Spacemacs definitions of "J",
after the evil collection dired keys have been setup
from: `spacemacs-bootstrap/packages.el`
to: `spacemacs-evil/init-evil-collection`

And use `spacemacs/counsel-find-file` in the `ivy` layer.

problem
In the `spacemacs-base` distribution.

When the `git-enable-magit-todos-plugin`
layer variable is enabled.

Then the following message appears on startup:
>An error occurred while pre-configuring magit-todos in layer git (error: (void-variable spacemacs-evil-collection-allowed-list))

cause
The `spacemacs-evil-collection-allowed-list` variable
is assigned in the `git` layer.

But it's defined in the `spacemacs-evil` layer.

The `spacemacs-evil` layer isn't used by default
in the `spacemacs-base` distribution.

solution
Check that the `spacemacs-evil` layer is used
before adding to the variable.

For introspection purposes it can be nice to have this functionality. Also this
function can be used to discover which ex-commands are available.