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+;;; evil-collection-calendar.el --- Evil bindings for calendar -*- lexical-binding: t -*-
+
+;; Copyright (C) 2017 Pierre Neidhardt
+
+;; Author: Pierre Neidhardt <mail@ambrevar.xyz>
+;; Maintainer: James Nguyen <james@jojojames.com>
+;; Pierre Neidhardt <mail@ambrevar.xyz>
+;; URL: https://github.com/emacs-evil/evil-collection
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "26.3"))
+;; Keywords: evil, calendar, tools
+
+;; This file 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, or (at your
+;; option) any later version.
+;;
+;; This file 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.
+;;
+;; For a full copy of the GNU General Public License
+;; see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;; Evil bindings for the calendar.
+
+;;; Code:
+(require 'calendar)
+(require 'evil-collection)
+
+(defconst evil-collection-calendar-maps '(calendar-mode-map))
+
+(defun evil-collection-calendar-setup-org-bindings ()
+  "Bind Org functions to Calendar keymap."
+  (require 'org)
+  (require 'org-agenda)
+  (defvar org-calendar-to-agenda-key)
+  (defvar org-agenda-diary-file)
+  (defvar org-calendar-insert-diary-entry-key)
+
+  (let ((key (pcase org-calendar-to-agenda-key
+               ((and key (pred stringp)) key)
+               ;; The default value of `org-calendar-to-agenda-key' is [?c] in Org 9.1
+               ;; We do make a minimal compatibility support for vector of integers.
+               ((and key (pred vectorp)) (mapconcat (lambda (x) (format "%c" x)) key ""))
+               ((and (pred symbolp) 'default) "c")
+               (_ ""))))
+    (evil-collection-define-key 'normal 'calendar-mode-map
+      (kbd key) 'org-calendar-goto-agenda))
+
+  ;; Similar to `org-calendar-to-agenda-key'.
+  (unless (eq org-agenda-diary-file 'diary-file)
+    (let ((key (pcase org-calendar-insert-diary-entry-key
+                 ((and key (pred stringp)) key)
+                 ((and key (pred vectorp)) (mapconcat (lambda (x) (format "%c" x)) key ""))
+                 ;; NOTE Consistent behavior with `org-calendar-to-agenda-key'
+                 ;; although it's not supported in Org officially.
+                 ((and (pred symbolp) 'default) "i")
+                 (_ ""))))
+      (evil-collection-define-key 'normal 'calendar-mode-map
+        (kbd key) 'org-agenda-diary-entry))))
+
+;; Otherwise it will load tons of org stuff at startup.
+(defvar evil-collection-calendar-want-org-bindings)
+(when evil-collection-calendar-want-org-bindings
+  (add-hook 'calendar-mode-hook #'evil-collection-calendar-setup-org-bindings))
+
+;;;###autoload
+(defun evil-collection-calendar-setup ()
+  "Set up `evil' bindings for `calendar'."
+  (evil-set-initial-state 'calendar-mode 'normal)
+  (evil-collection-define-key 'normal 'calendar-mode-map
+    ;; motion
+    "h" 'calendar-backward-day
+    "j" 'calendar-forward-week
+    "k" 'calendar-backward-week
+    "l" 'calendar-forward-day
+    "0" 'calendar-beginning-of-week
+    "^" 'calendar-beginning-of-week
+    "$" 'calendar-end-of-week
+    "[[" 'calendar-backward-year
+    "]]" 'calendar-forward-year
+    (kbd "M-<") 'calendar-beginning-of-year
+    (kbd "M->") 'calendar-end-of-year
+    "(" 'calendar-beginning-of-month
+    ")" 'calendar-end-of-month
+    (kbd "SPC") 'scroll-other-window
+    (kbd "S-SPC") 'scroll-other-window-down
+    (kbd "<delete>") 'scroll-other-window-down
+    "<" 'calendar-scroll-right
+    ">" 'calendar-scroll-left
+    (kbd "C-b") 'calendar-scroll-right-three-months
+    (kbd "C-f") 'calendar-scroll-left-three-months
+    "{" 'calendar-backward-month
+    "}" 'calendar-forward-month
+    (kbd "C-k") 'calendar-backward-month
+    (kbd "C-j") 'calendar-forward-month
+    "gk" 'calendar-backward-month
+    "gj" 'calendar-forward-month
+
+    ;; visual
+    "v" 'calendar-set-mark
+
+    ;; goto
+    "." 'calendar-goto-today
+    "o" 'calendar-other-month
+    "gd" 'calendar-goto-date ; "gd" in evil-org-agenda, "gd" in Emacs.
+    "gD" 'calendar-other-month
+
+    ;; diary
+    "D" 'diary-view-other-diary-entries
+    "d" 'diary-view-entries
+    "m" 'diary-mark-entries
+    "s" 'diary-show-all-entries
+
+    ;; appointment
+    "Aa" 'appt-add
+    "Ad" 'appt-delete
+
+    "u" 'calendar-unmark
+    "x" 'calendar-mark-holidays
+
+    ;; show
+    "gm" 'calendar-lunar-phases ; "gm" in evil-org-agenda. TODO: Shadows calendar-mayan.
+    "gs" 'calendar-sunrise-sunset ; "gs" in evil-org-agenda
+    "gh" 'calendar-list-holidays ; "gh" in evil-org-agenda. TODO: Shadows calendar-hebrew.
+    "gc" 'org-calendar-goto-agenda ; "gc" in evil-org-agenda. TODO: Shadows calendar-iso.
+    "a" 'calendar-list-holidays
+    "r" 'calendar-cursor-holidays
+
+    ;; refresh
+    "gr" 'calendar-redraw
+
+    "g?" 'calendar-goto-info-node
+    "?" 'calendar-goto-info-node ; Search is not very useful.
+    (kbd "M-=") 'calendar-count-days-region
+
+    ;; quit
+    "q" 'calendar-exit
+    "ZQ" 'evil-quit
+    "ZZ" 'calendar-exit))
+
+(provide 'evil-collection-calendar)
+;;; evil-collection-calendar.el ends here