0ab1e45fe4
Fix https://github.com/syl20bnr/spacemacs/issues/13197 Motivation: https://github.com/syl20bnr/spacemacs/issues/13197#issuecomment-577051372
343 lines
14 KiB
EmacsLisp
343 lines
14 KiB
EmacsLisp
;;; evil-evilified-state.el --- A minimalistic evil state
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;;
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;; Copyright (c) 2012-2018 Sylvain Benner & Contributors
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;;
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;; Author: Sylvain Benner <sylvain.benner@gmail.com>
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;; Keywords: convenience editing evil spacemacs
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;; Created: 22 Mar 2015
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;; Version: 1.0
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;; Package-Requires: ((evil "1.0.9"))
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;; This file is not part of GNU Emacs.
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Define a `evilified' evil state inheriting from `emacs' state and
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;; setting a minimalist list of Vim key bindings (like navigation, search, ...)
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;; The shadowed original mode key bindings are automatically reassigned
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;; following a set of rules:
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;; Keys such as
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;; /,:,h,j,k,l,n,N,v,V,gg,G,C-f,C-b,C-d,C-e,C-u,C-y and C-z
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;; are working as in Evil.
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;; Other keys will be moved according to this pattern:
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;; a -> A -> C-a -> C-A
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;; The first unreserved key will be used.
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;; There is an exception for g, which will be directly
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;; bound to C-G, since G and C-g (latest being an important escape key in Emacs)
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;; are already being used.
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;;; Code:
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(require 'evil)
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(require 'bind-map)
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(defvar evilified-state--evil-surround nil
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"Evil surround mode variable backup.")
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(make-variable-buffer-local 'evilified-state--evil-surround)
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(defvar evilified-state--normal-state-map nil
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"Local backup of normal state keymap.")
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(make-variable-buffer-local 'evilified-state--normal-state-map)
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(evil-define-state evilified
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"Evilified state.
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Hybrid `emacs state' with carefully selected Vim key bindings.
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See spacemacs conventions for more info."
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:tag " <N'> "
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:enable (emacs)
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:message "-- EVILIFIED BUFFER --"
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:cursor box)
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(bind-map spacemacs-default-map
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:prefix-cmd spacemacs-cmds
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:evil-keys (dotspacemacs-leader-key)
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:evil-states (evilified)
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:override-minor-modes t
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:override-mode-name spacemacs-leader-override-mode)
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(evil-define-command evil-force-evilified-state ()
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"Switch to evilified state without recording current command."
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:repeat abort
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:suppress-operator t
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(evil-evilified-state))
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(defun evilified-state--pre-command-hook ()
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"Redirect key bindings to `evilified-state'.
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Needed to bypass keymaps set as text properties."
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(unless (bound-and-true-p isearch-mode)
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(when (memq evil-state '(evilified visual))
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(let* ((map-or-symbol (get-char-property (point) 'keymap))
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(map (if (and (symbolp map-or-symbol) (boundp map-or-symbol))
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(symbol-value map-or-symbol)
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map-or-symbol))
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(evilified-map (when map (cdr (assq 'evilified-state map))))
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(command (when (and evilified-map
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(eq 1 (length (this-command-keys))))
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(lookup-key evilified-map (this-command-keys)))))
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(when command (setq this-command command))))))
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(defun evilified-state--setup-normal-state-keymap ()
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"Setup the normal state keymap."
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(unless evilified-state--normal-state-map
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(setq-local evilified-state--normal-state-map
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(copy-keymap evil-normal-state-map)))
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(setq-local evil-normal-state-map
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(copy-keymap evilified-state--normal-state-map))
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(define-key evil-normal-state-map [escape] 'evil-evilified-state))
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(defun evilified-state--restore-normal-state-keymap ()
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"Restore the normal state keymap."
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(setq-local evil-normal-state-map evilified-state--normal-state-map))
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(defun evilified-state--clear-normal-state-keymap ()
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"Clear the normal state keymap."
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(setq-local evil-normal-state-map (cons 'keymap nil))
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(evil-normalize-keymaps))
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(defun evilified-state--setup-visual-state-keymap ()
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"Setup the normal state keymap."
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(setq-local evil-visual-state-map
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(cons 'keymap (list (cons ?y 'evil-yank)
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(cons 'escape 'evil-exit-visual-state)))))
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(defun evilified-state--evilified-state-on-entry ()
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"Setup evilified state."
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(when (derived-mode-p 'magit-mode)
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;; Courtesy of evil-magit package
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;; without this set-mark-command activates visual-state which is just
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;; annoying ;; and introduces possible bugs
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(remove-hook 'activate-mark-hook 'evil-visual-activate-hook t))
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(when (bound-and-true-p evil-surround-mode)
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(make-local-variable 'evil-surround-mode)
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(evil-surround-mode -1))
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(evilified-state--setup-normal-state-keymap)
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(evilified-state--setup-visual-state-keymap)
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(add-hook 'pre-command-hook 'evilified-state--pre-command-hook nil 'local)
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(add-hook 'evil-visual-state-entry-hook
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'evilified-state--visual-state-on-entry nil 'local)
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(add-hook 'evil-visual-state-exit-hook
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'evilified-state--visual-state-on-exit nil 'local))
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(defun evilified-state--visual-state-on-entry ()
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"Setup visual state."
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;; we need to clear temporarily the normal state keymap in order to reach
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;; the mode keymap
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(when (eq 'evilified evil-previous-state)
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(evilified-state--clear-normal-state-keymap)))
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(defun evilified-state--visual-state-on-exit ()
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"Clean visual state"
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(evilified-state--restore-normal-state-keymap))
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(add-hook 'evil-evilified-state-entry-hook
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'evilified-state--evilified-state-on-entry)
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;; default key bindings for all evilified buffers
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(define-key evil-evilified-state-map "/" 'evil-search-forward)
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(define-key evil-evilified-state-map ":" 'evil-ex)
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(define-key evil-evilified-state-map "h" 'evil-backward-char)
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(define-key evil-evilified-state-map "j" 'evil-next-visual-line)
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(define-key evil-evilified-state-map "k" 'evil-previous-visual-line)
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(define-key evil-evilified-state-map "l" 'evil-forward-char)
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(define-key evil-evilified-state-map "n" 'evil-search-next)
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(define-key evil-evilified-state-map "N" 'evil-search-previous)
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(define-key evil-evilified-state-map "v" 'evil-visual-char)
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(define-key evil-evilified-state-map "V" 'evil-visual-line)
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(define-key evil-evilified-state-map "gg" 'evil-goto-first-line)
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(define-key evil-evilified-state-map "G" 'evil-goto-line)
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(define-key evil-evilified-state-map (kbd "C-f") 'evil-scroll-page-down)
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(define-key evil-evilified-state-map (kbd "C-b") 'evil-scroll-page-up)
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(define-key evil-evilified-state-map (kbd "C-e") 'evil-scroll-line-down)
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(define-key evil-evilified-state-map (kbd "C-y") 'evil-scroll-line-up)
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(define-key evil-evilified-state-map (kbd "C-d") 'evil-scroll-down)
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(define-key evil-evilified-state-map (kbd "C-u") 'evil-scroll-up)
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(define-key evil-evilified-state-map (kbd "C-z") 'evil-emacs-state)
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(define-key evil-evilified-state-map (kbd "C-w") 'evil-window-map)
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(setq evil-evilified-state-map-original (copy-keymap evil-evilified-state-map))
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;; old macro
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;;;###autoload
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(defmacro evilified-state-evilify (mode map &rest body)
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"Set `evilified state' as default for MODE.
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BODY is a list of additional key bindings to apply for the given MAP in
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`evilified state'."
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(let ((defkey (when body `(evil-define-key 'evilified ,map ,@body))))
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`(progn (unless ,(null mode)
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(unless (or (bound-and-true-p holy-mode)
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(eq 'evilified (evil-initial-state ',mode)))
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(evil-set-initial-state ',mode 'evilified)))
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(unless ,(null defkey) (,@defkey)))))
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(put 'evilified-state-evilify 'lisp-indent-function 'defun)
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;; new macro
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;;;###autoload
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(defmacro evilified-state-evilify-map (map &rest props)
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"Evilify MAP.
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Available PROPS:
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`:mode SYMBOL'
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A mode SYMBOL associated with MAP. Used to add SYMBOL to the list of modes
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defaulting to `evilified-state'.
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`:evilified-map SYMBOL'
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A map SYMBOL of an alternate evilified map, if nil then
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`evil-evilified-state-map' is used.
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`:eval-after-load SYMBOL'
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If specified the evilification of MAP is deferred to the loading of the feature
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bound to SYMBOL. May be required for some lazy-loaded maps.
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`:pre-bindings EXPRESSIONS'
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One or several EXPRESSIONS with the form `KEY FUNCTION':
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KEY1 FUNCTION1
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KEY2 FUNCTION2
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These bindings are set in MAP before the evilification happens.
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`:bindings EXPRESSIONS'
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One or several EXPRESSIONS with the form `KEY FUNCTION':
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KEY1 FUNCTION1
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KEY2 FUNCTION2
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These bindings are set directly in evil-evilified-state-map submap.
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...
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Each pair KEYn FUNCTIONn is defined in MAP after the evilification of it."
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(declare (indent 1))
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(let* ((mode (plist-get props :mode))
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(evilified-map (or (plist-get props :evilified-map)
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'evil-evilified-state-map-original))
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(eval-after-load (plist-get props :eval-after-load))
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(pre-bindings (evilified-state--mplist-get props :pre-bindings))
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(bindings (evilified-state--mplist-get props :bindings))
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(defkey (when bindings `(evil-define-key 'evilified ,map ,@bindings)))
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(body
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(progn
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(evilified-state--define-pre-bindings map pre-bindings)
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`(
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;; we need to work on a local copy of the evilified keymap to
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;; prevent the original keymap from being mutated.
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(setq evil-evilified-state-map (copy-keymap ,evilified-map))
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(let* ((sorted-map (evilified-state--sort-keymap
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evil-evilified-state-map))
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processed)
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(mapc (lambda (map-entry)
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(unless (member (car map-entry) processed)
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(setq processed (evilified-state--evilify-event
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,map ',map evil-evilified-state-map
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(car map-entry) (cdr map-entry)))))
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sorted-map)
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(unless ,(null defkey)
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(,@defkey)))
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(unless ,(null mode)
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(evilified-state--configure-default-state ',mode))))))
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(if (null eval-after-load)
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`(progn ,@body)
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`(with-eval-after-load ',eval-after-load (progn ,@body)))))
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(put 'evilified-state-evilify-map 'lisp-indent-function 'defun)
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(defun evilified-state--define-pre-bindings (map pre-bindings)
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"Define PRE-BINDINGS in MAP."
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(while pre-bindings
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(let ((key (pop pre-bindings))
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(func (pop pre-bindings)))
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(eval `(define-key ,map key ,func)))))
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(defun evilified-state--configure-default-state (mode)
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"Configure default state for the passed mode."
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(evil-set-initial-state mode 'evilified))
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(defun evilified-state--evilify-event (map map-symbol evil-map event evil-value
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&optional processed pending-funcs)
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"Evilify EVENT in MAP and return a list of PROCESSED events."
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(if (and event (or evil-value pending-funcs))
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(let* ((kbd-event (kbd (single-key-description event)))
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(map-value (lookup-key map kbd-event))
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(evil-value (or evil-value
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(lookup-key evil-map kbd-event)
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(car (pop pending-funcs)))))
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(when evil-value
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(evil-define-key 'evilified map kbd-event evil-value))
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(when map-value
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(add-to-list 'pending-funcs (cons map-value event) 'append))
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(push event processed)
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(setq processed (evilified-state--evilify-event
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map map-symbol evil-map
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(evilified-state--find-new-event event) nil
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processed pending-funcs)))
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(when pending-funcs
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(message
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(concat (format (concat "Auto-evilification could not remap these "
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"functions in map `%s':\n")
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map-symbol)
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(mapconcat (lambda (x)
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(format " - `%s' originally mapped on `%s'"
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(car x) (single-key-description (cdr x))))
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pending-funcs "\n")))))
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processed)
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(defun evilified-state--find-new-event (event)
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"Return a new event for the evilified EVENT."
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(when event
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(cond
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((equal event ?\a) nil) ; C-g (cannot remap C-g)
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((equal event 32) ?') ; space
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((equal event ?/) ?\\)
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((equal event ?:) ?|)
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((and (numberp event) (<= ?a event) (<= event ?z)) (- event 32))
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((equal event ?G) (+ (expt 2 25) ?\a)) ; G is mapped directly to C-S-g
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((and (numberp event) (<= ?A event) (<= event ?Z)) (- event 64))
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((and (numberp event) (<= 1 event) (<= event 26)) (+ (expt 2 25) event)))))
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(defun evilified-state--sort-keymap (map)
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"Sort MAP following the order: `s' > `S' > `C-s' > `C-S-s'"
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(let (list)
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(map-keymap (lambda (a b) (push (cons a b) list)) map)
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(sort list
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(lambda (a b)
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(setq a (car a) b (car b))
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(if (integerp a)
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(if (integerp b)
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(if (and (< a 256) (< b 256))
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(> a b)
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(< a b))
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t)
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(if (integerp b) nil
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(string< a b)))))))
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(defun evilified-state--mplist-get (plist prop)
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"Get the values associated to PROP in PLIST, a modified plist.
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A modified plist is one where keys are keywords and values are
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all non-keywords elements that follow it.
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If there are multiple properties with the same keyword, only the first property
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and its values is returned.
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Currently this function infloops when the list is circular."
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(let ((tail plist)
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result)
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(while (and (consp tail) (not (eq prop (car tail))))
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(pop tail))
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;; pop the found keyword
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(pop tail)
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(while (and (consp tail) (not (keywordp (car tail))))
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(push (pop tail) result))
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(nreverse result)))
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(provide 'evil-evilified-state)
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;;; core-evilified-state.el ends here
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