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+;;; evil-collection-mu4e.el --- Evil bindings for mu4e -*- lexical-binding: t -*-
+
+;; Copyright (C) 2015-2018 Joris Engbers
+;; Copyright (C) 2018 Pierre Neidhardt <ambrevar@gmail.com>
+
+;; Author: Joris Engbers <info@jorisengbers.nl>
+;; Maintainer: James Nguyen <james@jojojames.com>
+;; Pierre Neidhardt <ambrevar@gmail.com>
+;; URL: https://github.com/emacs-evil/evil-collection
+;; Version: 0.0.9
+;; Package-Requires: ((emacs "24.4") (evil "1.2.10"))
+;; Keywords: evil, mu4e, 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 keybindings for mu4e that make sense for Evil users.  The following
+;; keybindings are defined:
+;;
+;; General commands:
+;; | Commmand                 | evil-mu4e | Alternative |
+;; |--------------------------+-----------+-------------|
+;; | Jump to maildir          | J         |             |
+;; | Update                   | u         |             |
+;; | Compose message          | cc        | C           |
+;; | Kill update mail process | x         |             |
+
+;; Commands for header-mode and view-mode:
+;; | Command                         | evil-mu4e | Alternative |
+;; |---------------------------------+-----------+-------------|
+;; | Next message                    | C-j       |             |
+;; | Previous message                | C-k       |             |
+;; | Mark the current thread as read | T         |             |
+;; | Compose message                 | cc        | C           |
+;; | Compose edit**                  | ce        | E           |
+;; | Compose forward**               | cf        | F           |
+;; | Compose reply                   | cr        | R           |
+;; | Change sorting***               | o         | O           |
+;; | Rerun search                    | gr        |             |
+;; | Toggle include related          | zr        |             |
+;; | Toggle threading                | zt        |             |
+;; | Toggle hide cited               | za        |             |
+;; | Skip duplicates                 | zd        |             |
+;; | Show log                        | gl        |             |
+;; | Select other view               | gv        |             |
+;; | Save attachement(s)             | p         | P           |
+;; | Save url                        | yu        |             |
+;; | Go to url                       | gx        |             |
+;; | Fetch url                       | gX        |             |
+;;
+;;  - * denotes only in header-mode
+;;  - ** denotes Alternative only in header-mode
+;;  - *** denotes Alternative only in view-mode
+;;
+;;; Code:
+
+(require 'evil-collection)
+(require 'mu4e nil t)
+
+(declare-function mu4e~main-action-str "mu4e-main")
+(declare-function mu4e~main-view-queue "mu4e-main")
+(defvar smtpmail-send-queued-mail)
+(defvar smtpmail-queue-dir)
+
+(defconst evil-collection-mu4e-maps '(mu4e-main-mode-map
+                                      mu4e-headers-mode-map
+                                      mu4e-view-mode-map
+                                      mu4e-compose-mode-map))
+
+
+
+(defun evil-collection-mu4e-set-state ()
+  "Set the appropriate initial state of all mu4e modes."
+  (dolist (mode '(mu4e-main-mode
+                  mu4e-headers-mode
+                  mu4e-view-mode
+                  mu4e-org-mode))
+    (evil-set-initial-state mode 'normal))
+  (evil-set-initial-state 'mu4e-compose-mode 'insert))
+
+
+
+;;; Define bindings
+
+;; TODO: Inhibit insert-state functions as per Evil Collection.
+(defvar evil-collection-mu4e-mode-map-bindings
+  `((mu4e-main-mode-map
+     "J" mu4e~headers-jump-to-maildir
+     "j" next-line
+     "k" previous-line
+     "u" mu4e-update-mail-and-index
+     "gr" revert-buffer
+     "b" mu4e-headers-search-bookmark
+     "B" mu4e-headers-search-bookmark-edit
+     "N" mu4e-news
+     ";" mu4e-context-switch
+     "H" mu4e-display-manual
+     "C" mu4e-compose-new
+     "cc" mu4e-compose-new
+     "x" mu4e-kill-update-mail
+     "A" mu4e-about
+     "f" smtpmail-send-queued-mail
+     "m" mu4e~main-toggle-mail-sending-mode
+     "s" mu4e-headers-search
+     "q" mu4e-quit)
+
+    (mu4e-headers-mode-map
+     "q" mu4e~headers-quit-buffer
+     "J" mu4e~headers-jump-to-maildir
+     "C" mu4e-compose-new
+     "E" mu4e-compose-edit
+     "F" mu4e-compose-forward
+     "R" mu4e-compose-reply
+     "cc" mu4e-compose-new
+     "ce" mu4e-compose-edit
+     "cf" mu4e-compose-forward
+     "cr" mu4e-compose-reply
+     "o" mu4e-headers-change-sorting
+     "j" mu4e-headers-next
+     "k" mu4e-headers-prev
+     "gr" mu4e-headers-rerun-search
+     "b" mu4e-headers-search-bookmark
+     "B" mu4e-headers-search-bookmark-edit
+     ";" mu4e-context-switch
+     ,(kbd "RET") mu4e-headers-view-message
+     "/" mu4e-headers-search-narrow
+     "s" mu4e-headers-search
+     "S" mu4e-headers-search-edit
+     "x" mu4e-mark-execute-all
+     "a" mu4e-headers-action
+     "*" mu4e-headers-mark-for-something ; TODO: Don't override evil-seach-word-forward?
+     "&" mu4e-headers-mark-custom
+     "A" mu4e-headers-mark-for-action
+     "m" mu4e-headers-mark-for-move
+     "r" mu4e-headers-mark-for-refile
+     "D" mu4e-headers-mark-for-delete
+     "d" mu4e-headers-mark-for-trash
+     "=" mu4e-headers-mark-for-untrash
+     "u" mu4e-headers-mark-for-unmark
+     "U" mu4e-mark-unmark-all
+     "?" mu4e-headers-mark-for-unread
+     "!" mu4e-headers-mark-for-read
+     "%" mu4e-headers-mark-pattern
+     "+" mu4e-headers-mark-for-flag
+     "-" mu4e-headers-mark-for-unflag
+     "[" mu4e-headers-prev-unread
+     "]" mu4e-headers-next-unread
+     "gk" mu4e-headers-prev-unread
+     "gj" mu4e-headers-next-unread
+     "\C-j" mu4e-headers-next
+     "\C-k" mu4e-headers-prev
+     "zr" mu4e-headers-toggle-include-related
+     "zt" mu4e-headers-toggle-threading
+     "zd" mu4e-headers-toggle-skip-duplicates
+     "gl" mu4e-show-log
+     "gv" mu4e-select-other-view
+     "T" (lambda ()
+           (interactive)
+           (mu4e-headers-mark-thread nil '(read))))
+
+    (mu4e-compose-mode-map
+     "gg" mu4e-compose-goto-top
+     "G" mu4e-compose-goto-bottom)
+
+    (mu4e-view-mode-map
+     " " mu4e-view-scroll-up-or-next
+     [tab] shr-next-link
+     [backtab] shr-previous-link
+     "q" mu4e~view-quit-buffer
+     "gx" mu4e-view-go-to-url
+     "gX" mu4e-view-fetch-url
+     "C" mu4e-compose-new
+     "H" mu4e-view-toggle-html
+     ;; "E"               mu4e-compose-edit
+     ;; "F"               mu4e-compose-forward
+     "R" mu4e-compose-reply
+     "cc" mu4e-compose-new
+     "ce" mu4e-compose-edit
+     "cf" mu4e-compose-forward
+     "cr" mu4e-compose-reply
+     "p" mu4e-view-save-attachment
+     "P" mu4e-view-save-attachment-multi ; Since mu4e 1.0, -multi is same as normal.
+     "O" mu4e-headers-change-sorting
+     "o" mu4e-view-open-attachment
+     "A" mu4e-view-attachment-action
+     "a" mu4e-view-action
+     "J" mu4e~headers-jump-to-maildir
+     "[" mu4e-view-headers-prev-unread
+     "]" mu4e-view-headers-next-unread
+     "gk" mu4e-view-headers-prev-unread
+     "gj" mu4e-view-headers-next-unread
+     "\C-j" mu4e-view-headers-next
+     "\C-k" mu4e-view-headers-prev
+     "x" mu4e-view-marked-execute
+     "&" mu4e-view-mark-custom
+     "*" mu4e-view-mark-for-something   ; TODO: Don't override "*".
+     "m" mu4e-view-mark-for-move
+     "r" mu4e-view-mark-for-refile
+     "D" mu4e-view-mark-for-delete
+     "d" mu4e-view-mark-for-trash
+     "=" mu4e-view-mark-for-untrash
+     "u" mu4e-view-unmark
+     "U" mu4e-view-unmark-all
+     "?" mu4e-view-mark-for-unread
+     "!" mu4e-view-mark-for-read
+     "%" mu4e-view-mark-pattern
+     "+" mu4e-view-mark-for-flag
+     "-" mu4e-view-mark-for-unflag
+     "zr" mu4e-headers-toggle-include-related
+     "zt" mu4e-headers-toggle-threading
+     "za" mu4e-view-toggle-hide-cited
+     "gl" mu4e-show-log
+     "s" mu4e-view-search-edit
+     "|" mu4e-view-pipe
+     "." mu4e-view-raw-message
+     ,(kbd "C--") mu4e-headers-split-view-shrink
+     ,(kbd "C-+") mu4e-headers-split-view-grow
+     "T" (lambda ()
+           (interactive)
+           (mu4e-headers-mark-thread nil '(read)))
+     ,@(when evil-want-C-u-scroll
+         '("\C-u" evil-scroll-up))))
+  ;; TODO: Add mu4e-headers-search-bookmark?
+  "All evil-mu4e bindings.")
+
+(defun evil-collection-mu4e-set-bindings ()
+  "Set the bindings."
+  ;; WARNING: With lexical binding, lambdas from `mapc' and `dolist' become
+  ;; closures in which we must use `evil-define-key*' instead of
+  ;; `evil-define-key'.
+  (dolist (binding evil-collection-mu4e-mode-map-bindings)
+    (apply #'evil-collection-define-key 'normal binding))
+  (evil-collection-define-key 'visual 'mu4e-compose-mode-map
+    "gg" 'mu4e-compose-goto-top
+    "G" 'mu4e-compose-goto-bottom)
+  (evil-collection-define-key 'operator 'mu4e-view-mode-map
+    "u" '(menu-item
+          ""
+          nil
+          :filter (lambda (&optional _)
+                    (when (memq evil-this-operator
+                                '(evil-yank evil-cp-yank evil-sp-yank lispyville-yank))
+                      (setq evil-inhibit-operator t)
+                      #'mu4e-view-save-url)))))
+
+
+;;; Update mu4e-main-view
+;;; To avoid confusion the main-view is updated to show the keys that are in use
+;;; for evil-mu4e.
+
+(defvar evil-collection-mu4e-begin-region-basic "\n  Basics"
+  "The place where to start overriding Basic section.")
+
+(defvar evil-collection-mu4e-end-region-basic "a new message\n"
+  "The place where to end overriding Basic section.")
+
+(defvar evil-collection-mu4e-new-region-basic
+  (concat (mu4e~main-action-str "\t* [J]ump to some maildir\n" 'mu4e-jump-to-maildir)
+          (mu4e~main-action-str "\t* enter a [s]earch query\n" 'mu4e-search)
+          (mu4e~main-action-str "\t* [C]ompose a new message\n" 'mu4e-compose-new))
+  "Define the evil-mu4e Basic region.")
+
+(defvar evil-collection-mu4e-begin-region-misc "\n  Misc"
+  "The place where to start overriding Misc section.")
+
+(defvar evil-collection-mu4e-end-region-misc "q]uit"
+  "The place where to end overriding Misc section.")
+
+(defvar evil-collection-mu4e-new-region-misc
+  (concat
+   (mu4e~main-action-str "\t* [;]Switch focus\n" 'mu4e-context-switch)
+   (mu4e~main-action-str "\t* [u]pdate email & database (Alternatively: gr)\n"
+                         'mu4e-update-mail-and-index)
+
+   ;; show the queue functions if `smtpmail-queue-dir' is defined
+   (if (file-directory-p smtpmail-queue-dir)
+       (mu4e~main-view-queue)
+     "")
+   "\n"
+
+   (mu4e~main-action-str "\t* [N]ews\n" 'mu4e-news)
+   (mu4e~main-action-str "\t* [A]bout mu4e\n" 'mu4e-about)
+   (mu4e~main-action-str "\t* [H]elp\n" 'mu4e-display-manual)
+   (mu4e~main-action-str "\t* [q]uit\n" 'mu4e-quit))
+  "Define the evil-mu4e Misc region.")
+
+(defun evil-collection-mu4e-replace-region (new-region start end)
+  "Replace region between START and END with NEW-REGION.
+START end END end are regular expressions."
+  ;; move to start of region
+  (goto-char (point-min))
+  (re-search-forward start)
+
+  ;; insert new headings
+  (insert "\n\n")
+  (insert new-region)
+  ;; Delete text until end of region.
+  (let ((start-point (point))
+        (end-point (re-search-forward end)))
+    (delete-region start-point end-point)))
+
+
+(defun evil-collection-mu4e-update-main-view ()
+  "Update 'Basic' and 'Misc' regions to reflect the new
+keybindings."
+  (evil-collection-mu4e-replace-region evil-collection-mu4e-new-region-basic
+                                       evil-collection-mu4e-begin-region-basic
+                                       evil-collection-mu4e-end-region-basic)
+  (evil-collection-mu4e-replace-region evil-collection-mu4e-new-region-misc
+                                       evil-collection-mu4e-begin-region-misc
+                                       evil-collection-mu4e-end-region-misc))
+
+
+
+;;; Initialize evil-collection-mu4e
+
+(defun evil-collection-mu4e-setup ()
+  "Initialize evil-mu4e if necessary.
+If mu4e-main-mode is in evil-state-motion-modes, initialization
+is already done earlier."
+    (evil-collection-mu4e-set-state)
+    (evil-collection-mu4e-set-bindings)
+    (add-hook 'mu4e-main-mode-hook 'evil-collection-mu4e-update-main-view))
+
+(provide 'evil-collection-mu4e)
+;;; evil-collection-mu4e.el ends here