Add :meow-state keyword for use-package declarations

CUSTOMIZATIONS.org

@@ -358,3 +358,18 @@ change the variable =meow-cursor-type-insert=.
 
 Association list of symbols to their corresponding keymaps. Used
 to generate =meow-*-define-key= helpers.
+
+* Integration to other packages
+** :meow-state use-package keyword
+
+Simple keyword ~:meow-state~ added to [[https://github.com/jwiegley/use-package][use-package]] declarations.  Used to help
+populate ~meow-mode-state-list~, as follows:
+
+#+begin_src emacs-lisp
+(use-package sly
+  :meow-state ((sly-inspector-mode . motion)
+               (sly-db-mode . motion)))
+#+end_src
+
+The above would make the ~sly-inspector~ and ~sly-db~ modes start in Meow's
+~motion~ state.

meow-use-package.el

@@ -0,0 +1,53 @@
+;;; meow-use-package.el --- use-package keywords for Meow  -*- lexical-binding: t; -*-
+
+;; This file is not part of GNU Emacs.
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License
+;; as published by the Free Software Foundation; either version 3
+;; of the License, or (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+;; Add keywords to be used in `use-package' declarations.
+;; - :meow-state
+;; Can be used to populate `meow-mode-state-list' in the same manner as
+;; setting up hooks with the :hook keyword.  For example:
+
+;;     (use-package sly
+;;       :meow-state ((sly-inspector-mode . motion)
+;;                    (sly-db-mode . motion)))
+
+;; The above would make the `sly-inspector' and `sly-db' modes start in Meow's
+;; motion state.
+
+;;; Code:
+
+(require 'cl)
+(require 'use-package)
+
+;;;; :meow-state keyword
+
+(add-to-list 'use-package-keywords ':meow-state 'append)
+
+;; We re-use the normalize method from :hook.  This way we get the parsing of
+;; both a single cons, and a list of several.
+(defalias 'use-package-normalize/:meow-state #'use-package-normalize/:hook)
+
+(defun use-package-handler/:meow-state (name-symbol keyword args rest state)
+  (use-package-concat
+   (use-package-process-keywords name-symbol rest state)
+   `(,@(cl-loop for arg in args
+                collect `(add-to-list 'meow-mode-state-list (quote ,arg))))))
+
+(provide 'meow-use-package)
+;;; meow-use-package.el ends here

meow.el

@@ -41,6 +41,8 @@
 (require 'meow-core)
 (require 'meow-cheatsheet)
 (require 'meow-tutor)
+(when (fboundp #'use-package)
+  (require 'meow-use-package))
 
 (provide 'meow)
 ;;; meow.el ends here