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;;; my-gnus.el -- Email related extensions for emacs core -*- lexical-binding: t -*-

;; Copyright (C) 2023 Free Software Foundation.

;; Author: Yuchen Pei <id@ypei.org>
;; Package-Requires: ((emacs "28.2"))

;; This file is part of dotfiles.

;; dotfiles is free software: you can redistribute it and/or modify it under
;; the terms of the GNU Affero General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; dotfiles 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 Affero General
;; Public License for more details.

;; You should have received a copy of the GNU Affero General Public
;; License along with dotfiles.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Email related extensions for emacs core. Covers gnus, message mode etc.

;;; Code:


;;; `message-mode', the mode to compose messages
(defun my-message-elide-remaining ()
  "Elide all cited text after point."
  (interactive)
  (when-let* ((beg (point))
              (citexp (concat "^\\("
			                        (concat message-yank-cited-prefix "\\|")
			                        message-yank-prefix
			                        "\\)"))
              (end (save-excursion
                     (goto-char (point-max))
                     (when (re-search-backward citexp nil t)
                       (beginning-of-line 2)
                       (point)))))
    (when (< beg end) (message-elide-region beg end))))

(defun my-message-remove-trailing-cited-lines ()
  "Remove all trailing cited lines."
  (interactive)
  (save-excursion
    (when-let* ((citexp (concat "^\\("
			                          (concat message-yank-cited-prefix "\\|")
			                          message-yank-prefix
			                          "\\)+ *\n"))
                (end (progn
                       (goto-char (point-max))
                       (when (re-search-backward citexp nil t)
                         (beginning-of-line 2)
                         (point))))
                (beg (progn (beginning-of-line 0)
                            (while (looking-at-p citexp)
                              (beginning-of-line 0))
                            (beginning-of-line 2)
                            (point))))
      (when (< beg end) (delete-region beg end)))))

(defun my-message-before-previous-cited ()
  "Move point to before previous cited portion."
  (interactive)
  (let ((citexp (concat "^\\("
			                  (concat message-yank-cited-prefix "\\|")
			                  message-yank-prefix
			                  "\\)")))
    (beginning-of-line 1)
    (unless (looking-at-p citexp)
      (re-search-backward citexp nil t))
    (beginning-of-line 0)
    (while (looking-at-p citexp)
      (beginning-of-line 0))))

(defun my-message-after-next-cited ()
  "Move point to after the next cited portion."
  (interactive)
  (let ((citexp (concat "^\\("
			                  (concat message-yank-cited-prefix "\\|")
			                  message-yank-prefix
			                  "\\)")))
    (beginning-of-line 1)
    (unless (looking-at-p citexp)
      (re-search-forward citexp nil t))
    (beginning-of-line 2)
    (while (looking-at-p citexp)
      (beginning-of-line 2))))

(defun my-gnus-summary-exit-like-mu4e () (interactive)
       (if (get-buffer-window (gnus-buffer-live-p gnus-article-buffer))
	         (gnus-summary-expand-window)
	       (gnus-summary-exit)))

(defun my-gnus-summary-next-article-like-mu4e () (interactive)
       (if (get-buffer-window (gnus-buffer-live-p gnus-article-buffer))
	         (gnus-summary-next-article)
	       (next-line)))
(defun my-gnus-summary-prev-article-like-mu4e () (interactive)
       (if (get-buffer-window (gnus-buffer-live-p gnus-article-buffer))
	         (gnus-summary-prev-article)
	       (previous-line)))

(defun my-gnus-topic-select-group (arg)
  (interactive "P")
  (if arg (gnus-topic-select-group t)
    (gnus-topic-select-group 200)))

(defun my-gnus-move-article-like-mu4e ()
  (interactive)
  (call-interactively 'gnus-summary-move-article)
  (my-gnus-summary-next-article-like-mu4e))

(defvar my-gnus-group-default-targets
  '((archive . "Archive") (trash . "Trash")))

(defvar my-gnus-group-alist `((".*" . ,my-gnus-group-default-targets))
  "Alist of information about groups such as archive and trash
targets. Later entries override earlier ones")

(defun my-gnus-refile-article-like-mu4e (key)
  "Refile an article and move to the next, just like in mu4e.

The archiving target comes from `my-gnus-group-alist'.
KEY is either 'archive or 'trash."
  (interactive)
  (let ((target
         (alist-get key my-gnus-group-default-targets))
        (new-group-name))
    (pcase-dolist (`(,re . ,info) my-gnus-group-alist)
	    (when (and (string-match re gnus-newsgroup-name)
                 (alist-get key info))
        (setq target (alist-get key info))))
    (setq new-group-name
	        (replace-regexp-in-string
           "/.*"
           (concat "/" target)
           gnus-newsgroup-name))
    (gnus-summary-move-article 1 new-group-name)
    (my-gnus-summary-next-article-like-mu4e)))

(defun my-gnus-archive-article-like-mu4e ()
  "Archive an article and move to the next, just like in mu4e.

The archiving target comes from `my-gnus-group-alist'."
  (interactive)
  (my-gnus-refile-article-like-mu4e 'archive))

(defun my-gnus-trash-article-like-mu4e ()
  (interactive)
  (my-gnus-refile-article-like-mu4e 'trash))

(defun my-org-open-gnus-link (link)
	(my-select-new-window-matching-mode 'gnus-summary-mode)
	(org-gnus-open link t))

(defvar my-gnus-inbox-group nil
  "The default inbox to be opened with `my-gnus-open-inbox'.")
(defun my-gnus-open-inbox ()
  (interactive)
  (gnus-group-read-group t nil my-gnus-inbox-group))

(defun my-gnus-start ()
	(interactive)
	(let ((buffer (get-buffer "*Group*")))
		(if buffer 
			  (switch-to-buffer "*Group*")
		  (gnus))))

(defun my-gnus-topic-up ()
  (interactive)
  (gnus-topic-jump-to-topic (gnus-current-topic)))

(defun my-gnus-group-compose ()
  (interactive) (gnus-group-mail '(4)))

(defun my-gnus-group-get-new-news-quietly ()
  (interactive)
  (let ((inhibit-message t))
    (gnus-group-get-new-news)))


;; override `mm-display-external'
;; Removed the following nonsensical part
;; 			  ;; So that we pop back to the right place, sort of.
;;			  (switch-to-buffer gnus-summary-buffer)
(defun my-mm-display-external (handle method)
  "Display HANDLE using METHOD."
  (let ((outbuf (current-buffer)))
    (mm-with-unibyte-buffer
      (if (functionp method)
	        (let ((cur (current-buffer)))
	          (if (eq method 'mailcap-save-binary-file)
		            (progn
		              (set-buffer (generate-new-buffer " *mm*"))
		              (setq method nil))
	            (mm-insert-part handle)
	            (mm-add-meta-html-tag handle)
	            (let ((win (get-buffer-window cur t)))
		            (when win
		              (select-window win)))
	            (switch-to-buffer (generate-new-buffer " *mm*")))
	          (buffer-disable-undo)
	          (set-buffer-file-coding-system mm-binary-coding-system)
	          (insert-buffer-substring cur)
	          (goto-char (point-min))
	          (when method
	            (message "Viewing with %s" method))
	          (let ((mm (current-buffer))
		              (attachment-filename (mm-handle-filename handle))
		              (non-viewer (assq 'non-viewer
				                            (mailcap-mime-info
				                             (mm-handle-media-type handle) t))))
	            (unwind-protect
		              (if method
		                  (progn
			                  (when (and (boundp 'gnus-summary-buffer)
                                   (buffer-live-p gnus-summary-buffer))
			                    (when attachment-filename
			                      (with-current-buffer mm
			                        (rename-buffer
			                         (format "*mm* %s" attachment-filename) t)))
			                    ;; ;; So that we pop back to the right place, sort of.
			                    ;; (switch-to-buffer gnus-summary-buffer)
			                    (switch-to-buffer mm))
			                  (funcall method))
		                (mm-save-part handle))
		            (when (and (not non-viewer)
			                     method)
		              (mm-handle-set-undisplayer handle mm)))))
	      ;; The function is a string to be executed.
	      (mm-insert-part handle)
	      (mm-add-meta-html-tag handle)
	      ;; We create a private sub-directory where we store our files.
	      (let* ((dir (with-file-modes #o700
		                  (make-temp-file
		                   (expand-file-name "emm." mm-tmp-directory) 'dir)))
	             (filename (or
			                    (mail-content-type-get
			                     (mm-handle-disposition handle) 'filename)
			                    (mail-content-type-get
			                     (mm-handle-type handle) 'name)))
	             (mime-info (mailcap-mime-info
			                     (mm-handle-media-type handle) t))
	             (needsterm (or (assoc "needsterm" mime-info)
			                        (assoc "needsterminal" mime-info)))
	             (copiousoutput (assoc "copiousoutput" mime-info))
	             file buffer)
	        (if filename
	            (setq file (expand-file-name
			                    (gnus-map-function mm-file-name-rewrite-functions
					                                   (file-name-nondirectory filename))
			                    dir))
	          ;; Use nametemplate (defined in RFC1524) if it is specified
	          ;; in mailcap.
	          (let ((suffix (cdr (assoc "nametemplate" mime-info))))
	            (if (and suffix
		                   (string-match "\\`%s\\(\\..+\\)\\'" suffix))
		              (setq suffix (match-string 1 suffix))
		            ;; Otherwise, use a suffix according to
		            ;; `mailcap-mime-extensions'.
		            (setq suffix (car (rassoc (mm-handle-media-type handle)
					                                mailcap-mime-extensions))))
	            (setq file (with-file-modes #o600
			                     (make-temp-file (expand-file-name "mm." dir)
					                                 nil suffix)))))
	        (let ((coding-system-for-write mm-binary-coding-system))
	          (write-region (point-min) (point-max) file nil 'nomesg))
	        ;; The file is deleted after the viewer exists.  If the users edits
	        ;; the file, changes will be lost.  Set file to read-only to make it
	        ;; clear.
	        (set-file-modes file #o400 'nofollow)
	        (message "Viewing with %s" method)
	        (cond
	         (needsterm
	          (let ((command (mm-mailcap-command
			                      method file (mm-handle-type handle))))
	            (unwind-protect
		              (if window-system
		                  (set-process-sentinel
		                   (start-process "*display*" nil
				                              mm-external-terminal-program
				                              "-e" shell-file-name
				                              shell-command-switch command)
		                   (lambda (process _state)
			                   (if (eq 'exit (process-status process))
			                       (run-at-time
			                        60.0 nil
			                        (lambda ()
				                        (ignore-errors (delete-file file))
				                        (ignore-errors (delete-directory
						                                    (file-name-directory
						                                     file))))))))
		                (require 'term)
		                (require 'gnus-win)
		                (set-buffer
		                 (setq buffer
			                     (make-term "display"
				                              shell-file-name
				                              nil
				                              shell-command-switch command)))
		                (term-mode)
		                (term-char-mode)
		                (set-process-sentinel
		                 (get-buffer-process buffer)
                     (let ((wc gnus-current-window-configuration))
		                   (lambda (process _state)
			                   (when (eq 'exit (process-status process))
			                     (ignore-errors (delete-file file))
			                     (ignore-errors
			                       (delete-directory (file-name-directory file)))
			                     (gnus-configure-windows wc)))))
		                (gnus-configure-windows 'display-term))
		            (mm-handle-set-external-undisplayer handle (cons file buffer))
		            (add-to-list 'mm-temp-files-to-be-deleted file t))
	            (message "Displaying %s..." command))
	          'external)
	         (copiousoutput
	          (with-current-buffer outbuf
	            (forward-line 1)
	            (mm-insert-inline
	             handle
	             (unwind-protect
		               (progn
		                 (call-process shell-file-name nil
				                           (setq buffer
					                               (generate-new-buffer " *mm*"))
				                           nil
				                           shell-command-switch
				                           (mm-mailcap-command
				                            method file (mm-handle-type handle)))
		                 (if (buffer-live-p buffer)
			                   (with-current-buffer buffer
			                     (buffer-string))))
		             (progn
		               (ignore-errors (delete-file file))
		               (ignore-errors (delete-directory
				                           (file-name-directory file)))
		               (ignore-errors (kill-buffer buffer))))))
	          'inline)
	         (t
	          ;; Deleting the temp file should be postponed for some wrappers,
	          ;; shell scripts, and so on, which might exit right after having
	          ;; started a viewer command as a background job.
	          (let ((command (mm-mailcap-command
			                      method file (mm-handle-type handle))))
	            (unwind-protect
		              (let ((process-connection-type nil))
		                (start-process "*display*"
				                           (setq buffer
					                               (generate-new-buffer " *mm*"))
				                           shell-file-name
				                           shell-command-switch command)
		                (set-process-sentinel
		                 (get-buffer-process buffer)
		                 (lambda (process _state)
		                   (when (eq (process-status process) 'exit)
			                   (run-at-time
			                    60.0 nil
			                    (lambda ()
			                      (ignore-errors (delete-file file))
			                      (ignore-errors (delete-directory
					                                  (file-name-directory file)))))
			                   (when (buffer-live-p outbuf)
			                     (with-current-buffer outbuf
			                       (let ((buffer-read-only nil)
				                           (point (point)))
			                         (forward-line 2)
			                         (let ((start (point)))
				                         (mm-insert-inline
				                          handle (with-current-buffer buffer
					                                 (buffer-string)))
				                         (put-text-property start (point)
						                                        'face 'mm-command-output))
			                         (goto-char point))))
			                   (when (buffer-live-p buffer)
			                     (kill-buffer buffer)))
		                   (message "Displaying %s...done" command))))
		            (mm-handle-set-external-undisplayer
		             handle (cons file buffer))
		            (add-to-list 'mm-temp-files-to-be-deleted file t))
	            (message "Displaying %s..." command))
	          'external)))))))

(defun my-gnus-article-copy-region (beg end)
  "Copy an gnus article region from beginning to end, links included."
  (interactive "r")
  (let ((pairs)
        (copied (buffer-substring-no-properties beg end))
        (inhibit-message t))
    (save-excursion
      (goto-char beg)
      (when-let* ((button (button-at (point)))
                  (url (button-get button 'shr-url)))
        (push (cons (buffer-substring-no-properties
                     (button-start button)
                     (button-end button))
                    url)
              pairs))
      (while (and (shr-next-link)
                  (<= (point) end)
                  (button-at (point)))
        (let ((button (button-at (point))))
          (push (cons (buffer-substring-no-properties
                       (button-start button)
                       (button-end button))
                      (button-get button 'shr-url))
                pairs)))
      (pcase-dolist (`(,label . ,url) (reverse pairs))
        (setq copied
              (concat copied
                      (format "[%s] %s\n" label url)))))
    (kill-new copied)
    (setq deactivate-mark t)
    (let ((inhibit-message nil))
      (message "Copied region with %d links." (length pairs)))))

(provide 'my-gnus)
;;; my-gnus.el ends here