;;; mu4e-speedbar --- Speedbar support for mu4e -*- lexical-binding: t -*-

;; Copyright (C) 2012-2021 Antono Vasiljev, Dirk-Jan C. Binnema

;; Author: Antono Vasiljev <self@antono.info>
;; Version: 0.1
;; Keywords: file, tags, tools

;; 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, 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 this program.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:
;;
;; Speedbar provides a frame in which files, and locations in files
;; are displayed.  These functions provide mu4e specific support,
;; showing maildir list in the side-bar.
;;
;;   This file requires speedbar.

;;; Code:

(require 'speedbar)
(require 'mu4e-vars)
(require 'mu4e-headers)
(require 'mu4e-context)
(require 'mu4e-bookmarks)

(defvar mu4e-main-speedbar-key-map nil
  "Keymap used when in mu4e display mode.")
(defvar mu4e-headers-speedbar-key-map nil
  "Keymap used when in mu4e display mode.")
(defvar mu4e-view-speedbar-key-map nil
  "Keymap used when in mu4e display mode.")

(defvar mu4e-main-speedbar-menu-items nil
  "Additional menu-items to add to speedbar frame.")
(defvar mu4e-headers-speedbar-menu-items nil
  "Additional menu-items to add to speedbar frame.")
(defvar mu4e-view-speedbar-menu-items nil
  "Additional menu-items to add to speedbar frame.")


(defun mu4e-speedbar-install-variables ()
  "Install those variables used by speedbar to enhance mu4e."
  (add-hook 'mu4e-context-changed-hook
            #'mu4e~speedbar-context-changed-hook-fn)
  (dolist (keymap
           '( mu4e-main-speedbar-key-map
              mu4e-headers-speedbar-key-map
              mu4e-view-speedbar-key-map))
    (unless keymap
      (setq keymap (speedbar-make-specialized-keymap))
      (define-key keymap "RET" 'speedbar-edit-line)
      (define-key keymap "e" 'speedbar-edit-line))))

(defun mu4e~speedbar-context-changed-hook-fn ()
  (when (buffer-live-p speedbar-buffer)
    (with-current-buffer speedbar-buffer
      (let ((inhibit-read-only t))
        (mu4e-speedbar-buttons)))))

(with-eval-after-load 'speedbar
  (mu4e-speedbar-install-variables))

(defun mu4e~speedbar-render-maildir-list ()
  "Insert the list of maildirs in the speedbar."
  (interactive)
  (when (buffer-live-p speedbar-buffer)
    (with-current-buffer speedbar-buffer
      (mapcar (lambda (maildir-name)
                (speedbar-insert-button
                 (concat "  " maildir-name)
                 'mu4e-highlight-face
                 'highlight
                 'mu4e~speedbar-maildir
                 maildir-name))
              (mu4e-get-maildirs)))))

(defun mu4e~speedbar-maildir (&optional _text token _ident)
  "Jump to maildir TOKEN. TEXT and INDENT are not used."
  (dframe-with-attached-buffer
   (mu4e-search (concat "\"maildir:" token "\"") current-prefix-arg)))

(defun mu4e~speedbar-render-bookmark-list ()
  "Insert the list of bookmarks in the speedbar"
  (interactive)
  (mapcar (lambda (bookmark)
            (unless (plist-get bookmark :hide)
              (speedbar-insert-button
               (concat "  " (plist-get bookmark :name))
               'mu4e-highlight-face
               'highlight
               'mu4e~speedbar-bookmark
               (plist-get bookmark :query))))
          (mu4e-bookmarks)))

(defun mu4e~speedbar-bookmark (&optional _text token _ident)
  "Run bookmarked query TOKEN. TEXT and INDENT are not used."
  (dframe-with-attached-buffer
   (mu4e-search token current-prefix-arg)))

;;;###autoload
(defun mu4e-speedbar-buttons (&optional _buffer)
  "Create buttons for any mu4e BUFFER."
  (interactive)
  (erase-buffer)
  (insert (propertize "* mu4e\n\n" 'face 'mu4e-title-face))

  (insert (propertize " Bookmarks\n" 'face 'mu4e-title-face))
  (mu4e~speedbar-render-bookmark-list)
  (insert "\n")
  (insert (propertize " Maildirs\n" 'face 'mu4e-title-face))
  (mu4e~speedbar-render-maildir-list))

(defun mu4e-main-speedbar-buttons (buffer) (mu4e-speedbar-buttons buffer))
(defun mu4e-headers-speedbar-buttons (buffer) (mu4e-speedbar-buttons buffer))
(defun mu4e-view-speedbar-buttons (buffer) (mu4e-speedbar-buttons buffer))

;;; _
(provide 'mu4e-speedbar)
;;; mu4e-speedbar.el ends here