path: root/gnus.org

#+property: header-args :lexical t :tangle ~/.emacs.d/gnus.el :comments yes :results silent :shebang ";; -*- lexical-binding: t -*-" :tangle-mode (identity #o644)
#+title: Gnus

* Feature switching vars
  #+begin_src emacs-lisp
    (defvar jao-gnus-use-local-imap nil)
    (defvar jao-gnus-use-leafnode nil)
    (defvar jao-gnus-use-gandi-imap nil)
    (defvar jao-gnus-use-pm-imap nil)
    (defvar jao-gnus-use-gmane nil)
    (defvar jao-gnus-use-nnml nil)
    (defvar jao-gnus-use-maildirs nil)
  #+end_src
* Startup and kill
  #+begin_src emacs-lisp
    ;;;;; close gnus when closing emacs, but ask when exiting
    (setq gnus-interactive-exit t)

    (defun jao-gnus-started-hook ()
      (add-hook 'before-kill-emacs-hook 'gnus-group-exit))

    (add-hook 'gnus-started-hook 'jao-gnus-started-hook)

    (defun jao-gnus-after-exiting-hook ()
      (remove-hook 'before-kill-emacs-hook 'gnus-group-exit))

    (add-hook 'gnus-after-exiting-gnus-hook 'jao-gnus-after-exiting-hook)

    ;; define a wrapper around the save-buffers-kill-emacs
    ;; to run the new hook before:
    (defadvice save-buffers-kill-emacs
        (before my-save-buffers-kill-emacs activate)
      "Install hook when emacs exits before emacs asks to save this and that."
      (run-hooks 'before-kill-emacs-hook))
  #+end_src
* Directories
  #+begin_src emacs-lisp
    (defun jao-gnus-dir (dir)
      (expand-file-name dir gnus-home-directory))

    (setq smtpmail-queue-dir (jao-gnus-dir "Mail/queued-mail/"))

    (setq mail-source-directory (jao-gnus-dir "Mail/")
          message-directory (jao-gnus-dir "Mail/"))

    (setq gnus-default-directory (expand-file-name "~")
          gnus-startup-file (jao-gnus-dir "newsrc")
          gnus-agent-directory (jao-gnus-dir "News/agent")
          gnus-home-score-file (jao-gnus-dir "scores")
          gnus-article-save-directory (jao-gnus-dir "saved/")
          nntp-authinfo-file (jao-gnus-dir "authinfo")
          nnmail-message-id-cache-file (jao-gnus-dir "nnmail-cache")
          nndraft-directory (jao-gnus-dir "drafts")
          nnrss-directory (jao-gnus-dir "rss"))
  #+end_src
* Looks
*** Verbosity
    #+begin_src emacs-lisp
      (setq gnus-verbose 4)
    #+end_src
*** Geometry
    #+begin_src emacs-lisp
      ;;; geometry:
      (defvar jao-gnus-use-three-panes window-system)
      (defvar jao-gnus-groups-width 50)
      (defvar jao-gnus-wide-width 190)

      (setq gnus-use-trees nil
            gnus-generate-tree-function 'gnus-generate-horizontal-tree
            gnus-tree-minimize-window nil)

      (when jao-gnus-use-three-panes
        (let ((side-bar '(vertical 1.0
                                   ("inbox.org" 0.4)
                                   ("*Org Agenda*" 1.0)
                                   ("*Calendar*" 8)))
              (wide-len jao-gnus-wide-width)
              (groups-len jao-gnus-groups-width)
              (summary-len (- jao-gnus-wide-width jao-gnus-groups-width)))
          (gnus-add-configuration
           `(article
             (horizontal 1.0
                         (vertical ,groups-len (group 1.0))
                         (vertical ,summary-len
                                   (summary 0.25 point)
                                   (article 1.0))
                         ,side-bar)))

          (gnus-add-configuration
           `(group (horizontal 1.0 (group ,wide-len point) ,side-bar)))

          (gnus-add-configuration
           `(message (horizontal 1.0 (message ,wide-len point) ,side-bar)))

          (gnus-add-configuration
           `(reply-yank (horizontal 1.0 (message ,wide-len point) ,side-bar)))

          (gnus-add-configuration
           `(summary
             (horizontal 1.0
                         (vertical ,groups-len (group 1.0))
                         (vertical ,summary-len (summary 1.0 point))
                         ,side-bar)))

          (gnus-add-configuration
           `(reply
             (horizontal 1.0
                         (message ,(- wide-len 100) point)
                         (article 100)
                         ,side-bar)))))
    #+end_src
*** No blue icon
    #+begin_src emacs-lisp
      ;; (defalias 'gnus-mode-line-buffer-identification 'identity)
      (advice-add 'gnus-mode-line-buffer-identification :override #'identity)
      (setq gnus-mode-line-image-cache nil)
    #+end_src
* Search
  [[info:gnus#Searching][info:gnus#Searching]]

  #+begin_src emacs-lisp
    (setq gnus-search-use-parsed-queries t
          gnus-search-notmuch-raw-queries-p nil
          gnus-fetch-old-headers nil
          gnus-fetch-old-ephemeral-headers nil)
    (with-eval-after-load "gnus-search"
      (add-to-list 'gnus-search-expandable-keys "list")

      (cl-defmethod gnus-search-transform-expression ((engine gnus-search-notmuch)
						      (expr (head list)))
        (format "List:%s" (gnus-search-transform-expression engine (cdr expr)))))

    (defun jao-gnus--notmuch-engine (prefix config)
      (let ((prefix (file-name-as-directory (expand-file-name prefix "~")))
            (config (expand-file-name config gnus-home-directory)))
        `(gnus-search-engine gnus-search-notmuch
                             (remove-prefix ,prefix)
                             (config-file ,config))))
  #+end_src
* News server
  #+begin_src emacs-lisp
    (setq gnus-select-method
          (cond
           (jao-gnus-use-leafnode
            `(nntp "localhost"
                   ,(jao-gnus--notmuch-engine "var/news" "notmuch-news.config")))
           (jao-gnus-use-gmane '(nntp "news.gmane.io"))
           (t '(nnnil ""))))

    (setq gnus-secondary-select-methods '())

    (setq nnheader-read-timeout 0.02
          gnus-save-newsrc-file nil) ; .newsrc only needed by other newsreaders
  #+end_src
* Local mail
*** nnml
    #+begin_src emacs-lisp
      (setq mail-sources '((file :path "/var/mail/jao")
                           (maildir :path "~/var/mail/spam")
                           (maildir :path "~/var/mail/trash"))
            gnus-message-archive-group nil
            nnimap-quirks nil)

      (setq nnml-get-new-mail t
            nnmail-treat-duplicates 'delete
            nnmail-scan-directory-mail-source-once nil
            nnmail-cache-accepted-message-ids t
            nnmail-message-id-cache-length 100000
            nnmail-split-fancy-with-parent-ignore-groups nil
            nnmail-use-long-file-names t
            nnmail-crosspost t)

      (setq nnmail-resplit-incoming t
            nnmail-mail-splitting-decodes t
            nnmail-split-methods 'nnmail-split-fancy
            nnml-directory message-directory)

      (when jao-gnus-use-nnml
        (add-to-list
         'gnus-secondary-select-methods
         `(nnml "" ,(jao-gnus--notmuch-engine nnml-directory "notmuch.config"))))

      (defun jao-gnus-nnml--add-maildirs (dir)
        (dolist (f (directory-files (concat "~/var/mail/" dir) t "[^\\.]"))
          (add-to-list 'mail-sources `(maildir :path ,f))))

      (dolist (dir '("jao" "bigml" "feeds")) (jao-gnus-nnml--add-maildirs dir))

    #+end_src
*** maildirs
    #+begin_src emacs-lisp
      (when jao-gnus-use-maildirs
        (defun jao-gnus--maildir (dir)
          (let ((root (concat "/tmp/mboxes/" dir "/"))
                (config (concat "~/.notmuch-config-" dir)))
            (add-to-list
             'gnus-secondary-select-methods
             `(nnmaildir ,dir (directory ,root)
                         (gnus-search-engine gnus-search-notmuch
                                             (remove-prefix ,root)
                                             (config-file ,config))))))
        (jao-gnus--maildir "jao")
        (jao-gnus--maildir "feeds")
        (jao-gnus--maildir "bigml"))

    #+end_src
* IMAP servers
  #+begin_src emacs-lisp
    (when jao-gnus-use-local-imap
      (add-to-list 'gnus-secondary-select-methods
                   `(nnimap "" (nnimap-address "localhost"))))

    (when jao-gnus-use-pm-imap
      (add-to-list 'gnus-secondary-select-methods
                   '(nnimap "pm"
                            (nnimap-address "127.0.0.1")
                            (nnimap-stream network)
                            (nnimap-server-port 1143))))

    (when jao-gnus-use-gandi-imap
      (add-to-list 'gnus-secondary-select-methods
                   '(nnimap "gandi" (nnimap-address "mail.gandi.net"))))
  #+end_src
* Demons and notifications
  #+begin_src emacs-lisp
    (setq mail-user-agent 'gnus-user-agent)

    (require 'gnus-demon)
    (gnus-demon-add-handler 'jao-gnus-notify 5 1)
    ;; (gnus-demon-remove-handler 'jao-gnus-notify)

    ;; synchronicity
    (setq gnus-asynchronous t)
    ;;; prefetch as many articles as possible
    (setq gnus-use-article-prefetch nil)

    (setq gnus-save-killed-list nil)
    (setq gnus-check-new-newsgroups nil)

    (defvar jao-gnus-tracked-groups
      (let ((feeds (thread-first
                     (directory-files mail-source-directory nil "feeds")
                     (seq-difference '("feeds.trove")))))
        `(("nnml:bigml.inbox" "B" jao-themes-f00)
          ("nnml:bigml.bugs" "b" jao-themes-error)
          ("nnml:bigml.support" "S" default)
          ("nnml:jao.inbox" "I" jao-themes-f01)
          ("nnml:bigml.[^ibs]" "W" jao-themes-dimm)
          ("nnml:jao.[^ist]" "J" jao-themes-dimm)
          (,(format "^nnml:%s" (regexp-opt feeds)) "F" jao-themes-dimm)
          ("^gmane" "G" jao-themes-dimm)
          ("nnml:local" "l" jao-themes-dimm))))

    (defun jao-gnus--unread-counts ()
      (seq-reduce (lambda (r g)
                    (let ((n (gnus-group-unread (car g))))
                      (if (and (numberp n) (> n 0))
                          (prog1 (cons (cons (car g) n) r)
                            (gnus-message 7 "%s in %s" n g))
                        r)))
                  gnus-newsrc-alist
                  ()))

    (defun jao-gnus--unread-label (counts rx label face)
      (let ((n (seq-reduce (lambda (n c)
                             (if (string-match-p rx (car c)) (+ n (cdr c)) n))
                           counts
                           0)))
        (when (> n 0) `(:propertize ,(format "%s%d " label n) face ,face))))

    (defvar jao-gnus--notify-strs ())

    (defun jao-gnus--notify-strs ()
      (let ((counts (jao-gnus--unread-counts)))
        (seq-filter #'identity
                    (seq-map (lambda (args)
                               (apply 'jao-gnus--unread-label counts args))
                             jao-gnus-tracked-groups))))

    (defun jao-gnus--notify ()
      (setq jao-gnus--notify-strs (jao-gnus--notify-strs))
      (save-window-excursion (jao-minibuffer-refresh)))

    (add-hook 'gnus-after-getting-new-news-hook #'jao-gnus--notify)
    (add-hook 'gnus-started-hook #'jao-gnus--notify)

    (defun jao-gnus--summary-done ()
        (let ((inhibit-message t)
              (message-log-max nil))
          (save-window-excursion
            (jao-gnus--notify)
            (org-agenda-list))))

    (add-hook 'gnus-summary-exit-hook #'jao-gnus--summary-done)

    (with-eval-after-load "jao-minibuffer"
      (jao-minibuffer-add-variable 'jao-gnus--notify-strs -20))

  #+end_src
* Delayed messages
  #+BEGIN_SRC emacs-lisp
    ;;; delayed messages (C-cC-j in message buffer)
    (require 'gnus-util)
    (gnus-delay-initialize)
    (setq gnus-delay-default-delay "3h")
    ;;; so that the Date is set when the message is sent, not when it's
    ;;; delayed
    (eval-after-load "message"
      '(setq message-draft-headers (remove 'Date message-draft-headers)))
  #+END_SRC
* Spam
  #+begin_src emacs-lisp
    (setq jao-gnus-ham-groups ".*\\(bigml\\|jao\\|feeds\\)\\..*"
          gnus-spam-process-destinations `((,jao-gnus-ham-groups "nnml:spam"))
          gnus-spam-newsgroup-contents
          `((".*spam.*" gnus-group-spam-classification-spam)
            (,jao-gnus-ham-groups gnus-group-spam-classification-ham))
          gnus-ham-process-destinations
          '((".*\\(jao\\|feeds\\)\\..*" "jao.inbox")
            (".*bigml\\..*" "bigml.inbox"))
          gnus-spam-process-newsgroups
          `((,jao-gnus-ham-groups ((spam spam-use-bogofilter)
                                   (ham spam-use-bogofilter)
                                   (spam spam-use-spamassassin)
                                   (ham spam-use-spamassassin)
                                   (spam spam-use-blacklist)))
            ("nnml:spam" ((ham spam-use-blacklist)
                          (spam spam-use-bogofilter)
                          (ham spam-use-bogofilter))))
          spam-use-blacklist t
          spam-use-BBDB nil
          spam-use-bogofilter t
          spam-use-spamassassin nil
          spam-spamassassin-program "spamc"
          spam-split-group "spam")

    ;; (spam-initialize)
  #+end_src
* Add-ons
*** icalendar/org
    #+begin_src emacs-lisp
      (require 'ol-gnus)
      (use-package gnus-icalendar
        :demand t
        :init (setq gnus-icalendar-org-capture-file
                    (expand-file-name "inbox.org" org-directory)
                    gnus-icalendar-org-capture-headline '("Appointments"))
        :config (gnus-icalendar-org-setup))
    #+end_src
*** bbdb
    #+begin_src emacs-lisp
      (with-eval-after-load "bbdb"
        (bbdb-initialize 'gnus 'message 'pgp 'mail)
        (bbdb-mua-auto-update-init 'gnus)
        (with-eval-after-load "gnus-sum"
          (define-key gnus-summary-mode-map ":" 'bbdb-mua-annotate-sender)
          (define-key gnus-summary-mode-map ";" 'bbdb-mua-annotate-recipients)))
    #+end_src
*** randomsig
    #+begin_src emacs-lisp
      (with-eval-after-load "randomsig"
        (with-eval-after-load "gnus-sum"
          (define-key gnus-summary-save-map "-" 'gnus/randomsig-summary-read-sig)))
    #+end_src
*** notmuch -> gnus
    #+begin_src emacs-lisp
      (defun jao-notmuch-goto-message-in-gnus ()
        "Open a summary buffer containing the current notmuch article."
        (interactive)
        (let ((group (jao-maildir-file-to-group (notmuch-show-get-filename)
                                                mail-source-directory))
              (message-id (replace-regexp-in-string "^id:"
                                                    ""
                                                    (notmuch-show-get-message-id))))
          (if (and group message-id)
              (org-gnus-follow-link group message-id)
            (message "Couldn't get relevant infos for switching to Gnus."))))

      (defalias 'jao-open-gnus-frame 'jao-afio--goto-mail)

      (eval-after-load "notmuch-show"
        '(define-key notmuch-show-mode-map (kbd "C-c C-c")
           #'jao-notmuch-goto-message-in-gnus))
    #+end_src
* Groups buffer
  #+begin_src emacs-lisp
    ;; (setq gnus-group-line-format " %m%S%p%P:%~(pad-right 35)c %3y %B\n")
    (setq gnus-group-line-format " %m%S%p%3y%P%* %~(pad-right 30)C %B\n")
    (setq gnus-topic-line-format "%i[ %(%{%n%}%) -- %A ]%v\n")
    (setq gnus-group-uncollapsed-levels 2)
    (setq gnus-auto-select-subject 'unread)
    (setq-default gnus-large-newsgroup 2000)

    (add-hook 'gnus-select-group-hook 'gnus-group-set-timestamp)
    (add-hook 'gnus-group-mode-hook 'gnus-topic-mode)

    (defvar jao-gnus--expire-every 50)
    (defvar jao-gnus--get-count (1+ jao-gnus--expire-every))

    (defun jao-gnus-get-new-news (&optional arg)
      (interactive "p")
      (when (and jao-gnus--expire-every
                 (> jao-gnus--get-count jao-gnus--expire-every))
        (when jao-gnus-use-pm-imap (gnus-group-catchup "nnimap:pm/spam" t))
        (gnus-group-expire-all-groups)
        (setq jao-gnus--get-count 0))
      (setq jao-gnus--get-count (1+ jao-gnus--get-count))
      (gnus-group-get-new-news (max (if (= 1 jao-gnus--get-count) 4 3)
                                    (or arg 0))))

    ;; (define-key gnus-group-mode-map "g" 'jao-gnus-get-new-news)

    (defun jao-gnus-restart-servers ()
      (interactive)
      (message "Restarting all servers...")
      (gnus-group-enter-server-mode)
      (gnus-server-close-all-servers)
      (gnus-server-open-all-servers)
      (gnus-server-exit)
      (message "Restarting all servers... done"))

    (define-key gnus-group-mode-map "z" nil)
    (define-key gnus-group-mode-map "zg" #'notmuch)
    (define-key gnus-group-mode-map "zz" #'jao-consult-notmuch-folder)
    (define-key gnus-group-mode-map "zZ" #'consult-notmuch)
    (define-key gnus-group-mode-map "\C-x\C-s" #'gnus-group-save-newsrc)

    (jao-transient-major-mode gnus-group
      ["Search"
       ("zc" "consult search" consult-notmuch)
       ("zf" "consult folder search" jao-consult-notmuch-folder)
       ("g" "gnus search" gnus-group-read-ephemeral-search-group)])

    (defun jao-gnus--first-group ()
      (when (derived-mode-p 'gnus-group-mode)
        (gnus-group-first-unread-group)))

    (with-eval-after-load "jao-afio"
      (add-hook 'jao-afio-switch-hook #'jao-gnus--first-group))
    #+end_src
* Group parameters
  #+begin_src emacs-lisp
    (setq gnus-permanently-visible-groups "^nnselect:.*today")

    (defvar jao-gnus-image-groups '("xkcd"))

    (setq gnus-parameters
          `(("nnml:\\(local\\|trash\\|spam\\)"
             (auto-expire . t)
             (total-expire . t)
             (expiry-wait . 1)
             (expiry-target . delete))
            ("nnml:jao\\..*"
             (posting-style ("Bcc" "proton@jao.io")
                            ("Gcc" "nnml:jao.trove"))
             (jao-gnus--trash-group "nnml:trash")
             (jao-gnus--spam-group "nnml:spam")
             (jao-gnus--archiving-group "nnml:jao.trove"))
            ("nnml:\\(jao\\|bigml\\)\\.\\(trash\\|spam\\)"
             (gcc-self . nil)
             (auto-expire . t)
             (total-expire . t)
             (expiry-wait . 1)
             (jao-gnus--trash-group nil)
             (expiry-target . delete))
            ("nnml:bigml\\..*"
             (posting-style (address "jao@bigml.com"))
             (jao-gnus--trash-group "nnml:trash")
             (jao-gnus--spam-group "nnml:spam")
             (jao-gnus--archiving-group "nnml:bigml.trove"))
            ("nnml:bigml\\.inbox"
             (gcc-self . t)
             (auto-expire . t)
             (total-expire . t)
             (expiry-wait . 7)
             (expiry-target . "nnml:bigml.trove"))
            ("nnml:bigml\\.trove"
             (auto-expire . t)
             (total-expire . t)
             (expiry-target . delete)
             (expiry-wait . 365))
            (,(format "^nnml:bigml\\.%s" (regexp-opt '("support" "reports"
                                                       "deploys" "lists"
                                                       "drivel" "bugs")))
             (jao-gnus--trash-group nil)
             (gcc-self . nil)
             (auto-expire . t)
             (total-expire . t)
             (expiry-wait . 3)
             (expiry-target . delete))
            ("nnml:jao\\.drivel"
             (auto-expire . t)
             (total-expire . t)
             (expiry-wait . 3)
             (expiry-target . delete))
            ("nnml:feeds\\.\\(.*\\)"
             (auto-expire . t)
             (total-expire . t)
             (expiry-wait . 7)
             (expiry-target . delete)
             (comment . "feeds.\\1")
             (jao-gnus--archiving-group "nnml:feeds.trove"))
            ("^nnml:feeds\\.\\(news\\)$" (expiry-wait . 2))
            ("^nnml:feeds\\.erlang" (gnus-list-identifiers "Erlang Forums"))
            ("nnml:feeds\\.trove"
             (auto-expire . nil)
             (total-expire . nil))
            (,(format "nnml:feeds\\.fun\\|gwene\\..*%s.*"
                      (regexp-opt jao-gnus-image-groups))
             (mm-html-inhibit-images nil)
             (mm-html-blocked-images nil))
            ("\\(gmane\\|gwene\\)\\..*"
             (jao-gnus--archiving-group "nnml:feeds.trove")
             (posting-style (address "jao@gnu.org")))))

  #+end_src
* Summary buffer
*** Configuration
    #+begin_src emacs-lisp
      (setq gnus-face-1 'jao-gnus-face-tree)

      (setq gnus-show-threads t
            gnus-thread-hide-subtree t
            gnus-summary-make-false-root 'adopt
            gnus-summary-gather-subject-limit 120
            gnus-sort-gathered-threads-function 'gnus-thread-sort-by-date
            gnus-thread-sort-functions '(gnus-thread-sort-by-date))

      (setq gnus-summary-ignore-duplicates t
            gnus-suppress-duplicates t
            ;; gnus-summary-ignored-from-addresses jao-mails-regexp
            gnus-process-mark-toggle t
            gnus-refer-thread-use-search t
            gnus-auto-select-next 'almost-quietly)
    #+end_src
*** Search
    #+begin_src emacs-lisp
      (defun jao-gnus--maybe-reselect (&rest _i)
        (when (string-match-p "^nnselect" (or (gnus-group-name-at-point) ""))
          (save-excursion (gnus-group-get-new-news-this-group))))

      (advice-add 'gnus-group-select-group :before #'jao-gnus--maybe-reselect)
    #+end_src
*** Summary line
    #+begin_src emacs-lisp
      (setq gnus-not-empty-thread-mark ?·) ; ↓)
      (setq jao-gnus--summary-line-fmt
            (concat "%%U %%*%%R %%uj "
                    "[ %%~(max-right 23)~(pad-right 23)uf "
                    " %%I%%~(pad-left 2)t ] %%s"
                    "%%-%s="
                    "%%~(max-right 8)~(pad-left 8)&user-date;"
                    "\n"))

      (defun jao-gnus--set-summary-line (&optional w)
        (let* ((d (if jao-gnus-use-three-panes (+ jao-gnus-groups-width 11) 12))
               (w (- (or w (window-width)) d)))
          (setq gnus-summary-line-format (format jao-gnus--summary-line-fmt w))))

      (add-hook 'gnus-select-group-hook 'jao-gnus--set-summary-line)
      ;; (jao-gnus--set-summary-line 187)

      (add-to-list 'nnmail-extra-headers 'Cc)
      (add-to-list 'nnmail-extra-headers 'BCc)
      (add-to-list 'gnus-extra-headers 'Cc)
      (add-to-list 'gnus-extra-headers 'BCc)

      (defun gnus-user-format-function-j (headers)
        (let ((to (gnus-extra-header 'To headers)))
          (if (string-match jao-mails-regexp to)
              (if (string-match "," to) "¬" "»") ;; "~" "=")
            (if (or (string-match jao-mails-regexp
                                  (gnus-extra-header 'Cc headers))
                    (string-match jao-mails-regexp
                                  (gnus-extra-header 'BCc headers)))
                "¬" ;; "~"
              " "))))

      (defconst jao-gnus--news-rx
        (regexp-opt '("ElDiaro.es "
                      "ElDiario.es - ElDiario.es: "
                      "The Guardian: "
                      "Aeon | a world of ideas: ")))

      (defun gnus-user-format-function-f (headers)
        (let* ((from (gnus-header-from headers))
               (from (gnus-summary-extract-address-component from)))
          (replace-regexp-in-string jao-gnus--news-rx "" from)))

      (setq gnus-user-date-format-alist
            '(((gnus-seconds-today) . "%H:%M")
              ((+ 86400 (gnus-seconds-today)) . "'%H:%M")
              ;; (604800 . "%a %H:%M") ;; that's one week
              ((gnus-seconds-month) . "%a %d")
              ((gnus-seconds-year) . "%b %d")
              (t . "%b '%y")))

    #+end_src
*** Moving messages around
    #+BEGIN_SRC emacs-lisp
      (defvar-local jao-gnus--spam-group nil)
      (defvar-local jao-gnus--archiving-group nil)
      (defvar-local jao-gnus--archive-as-copy-p nil)

      (defvar jao-gnus--last-move nil)
      (defun jao-gnus-move-hook (a headers c to d)
        (setq jao-gnus--last-move (cons to (mail-header-id headers))))
      (defun jao-gnus-goto-last-moved ()
        (interactive)
        (when jao-gnus--last-move
          (when (eq major-mode 'gnus-summary-mode) (gnus-summary-exit))
          (gnus-group-goto-group (car jao-gnus--last-move))
          (gnus-group-select-group)
          (gnus-summary-goto-article (cdr jao-gnus--last-move) nil t)))
      (add-hook 'gnus-summary-article-move-hook 'jao-gnus-move-hook)

      (defun jao-gnus-archive (follow)
        (interactive "P")
        (if jao-gnus--archiving-group
            (progn
              (if (or jao-gnus--archive-as-copy-p
                      (not (gnus-check-backend-function
                            'request-move-article gnus-newsgroup-name)))
                  (gnus-summary-copy-article nil jao-gnus--archiving-group)
                (gnus-summary-move-article nil jao-gnus--archiving-group))
              (when follow (jao-gnus-goto-last-moved)))
          (gnus-summary-mark-as-read)
          (gnus-summary-delete-article)))

      (defun jao-gnus-archive-tickingly ()
        (interactive)
        (gnus-summary-tick-article)
        (jao-gnus-archive)
        (when jao-gnus--archive-as-copy-p
          (gnus-summary-mark-as-read)))

      (defun jao-gnus-show-tickled ()
        (interactive)
        (gnus-summary-limit-to-marks "!"))

      (make-variable-buffer-local
       (defvar jao-gnus--trash-group nil))

      (defun jao-gnus-trash ()
        (interactive)
        (gnus-summary-mark-as-read)
        (if jao-gnus--trash-group
            (gnus-summary-move-article nil jao-gnus--trash-group)
          (gnus-summary-delete-article)))

      (defun jao-gnus-move-to-spam ()
        (interactive)
        (gnus-summary-mark-as-read)
        (gnus-summary-move-article nil jao-gnus--spam-group))

      (define-key gnus-summary-mode-map "Ba" 'jao-gnus-archive)
      (define-key gnus-summary-mode-map "BA" 'jao-gnus-archive-tickingly)
      (define-key gnus-summary-mode-map "Bl" 'jao-gnus-goto-last-moved)

      (define-key gnus-summary-mode-map (kbd "B DEL") 'jao-gnus-trash)
      (define-key gnus-summary-mode-map (kbd "B <backspace>") 'jao-gnus-trash)
      (define-key gnus-summary-mode-map "Bs" 'jao-gnus-move-to-spam)
      (define-key gnus-summary-mode-map "/!" 'jao-gnus-show-tickled)
      (define-key gnus-summary-mode-map [f7] 'gnus-summary-force-verify-and-decrypt)
    #+END_SRC
*** Saving emails
    #+BEGIN_SRC emacs-lisp
      (setq gnus-default-article-saver 'gnus-summary-save-article-mail)
      (defvar jao-gnus-file-save-directory (expand-file-name "~/tmp"))
      (defun jao-gnus-file-save (newsgroup headers &optional last-file)
        (expand-file-name (format "%s.eml" (mail-header-subject headers))
                          jao-gnus-file-save-directory))
      (setq gnus-mail-save-name 'jao-gnus-file-save)
    #+END_SRC
*** arXiv capture
    #+begin_src emacs-lisp
      (use-package org-capture
        :config
        (add-to-list 'org-capture-templates
                     '("X" "arXiv" entry (file "notes/physics/arxiv.org")
                       "* %:subject\n  %i" :immediate-finish t)
                     t)
        (org-capture-upgrade-templates org-capture-templates))

      (defun jao-gnus-arXiv-capture ()
        (interactive)
        (gnus-summary-select-article-buffer)
        (gnus-article-goto-part 0)
        (forward-paragraph)
        (setq-local transient-mark-mode 'lambda)
        (set-mark (point))
        (goto-char (point-max))
        (org-capture nil "X"))
    #+end_src
* Article buffer
*** Config, headers
    #+begin_src emacs-lisp
      (setq mail-source-delete-incoming t)
      (setq gnus-gcc-mark-as-read t)
      (setq gnus-treat-display-smileys nil)
      (setq gnus-treat-fill-long-lines nil)
      (setq gnus-treat-fill-article nil)
      (setq gnus-treat-fold-headers nil)
      (setq gnus-treat-strip-leading-blank-lines t)
      (setq gnus-article-auto-eval-lisp-snippets nil)
      (setq gnus-posting-styles '((".*" (name "Jose A. Ortega Ruiz"))))
      (setq gnus-single-article-buffer nil)
      (setq gnus-article-update-lapsed-header 60)
      (setq gnus-article-update-date-headers 60)

      (eval-after-load "gnus-art"
        '(setq
          gnus-visible-headers
          (concat
           gnus-visible-headers
           "\\|^List-[iI][Dd]:\\|^X-Newsreader:\\|^X-Mailer:\\|User-Agent:\\|X-User-Agent:")))
    #+end_src
*** HTML email (washing, images)
    #+begin_src emacs-lisp
      (setq  gnus-button-url 'browse-url-generic
             gnus-inhibit-images t
             mm-discouraged-alternatives nil ;; '("text/html" "text/richtext")
             mm-inline-large-images 'resize)

      ;; no html in From: (washing articles from arxiv feeds)
      (require 'shr)
      (defun jao-gnus-remove-anchors ()
        (save-excursion
          (goto-char (point-min))
          (when (re-search-forward "[gq].+ updates on arXiv.org: " nil t)
            (replace-match "")
            (let ((begin (point)))
              (when (re-search-forward "^\\(To\\|Subject\\):" nil t)
                (beginning-of-line)
                (let ((shr-width 10000))
                  (shr-render-region begin (1- (point)))))))))

      (add-hook 'gnus-part-display-hook 'jao-gnus-remove-anchors)
      (defvar-local jao-gnus--images-p nil)

      (defun jao-gnus-show-images ()
        (interactive)
        (save-window-excursion
          (gnus-summary-select-article-buffer)
          (save-excursion
            (setq jao-gnus--images-p (not jao-gnus--images-p))
            (if jao-gnus--images-p
                (gnus-article-show-images)
              (gnus-article-remove-images)))))
    #+end_src
*** Follow links and enclosures
    #+begin_src emacs-lisp
      (defun jao-gnus-follow-link (&optional external)
        (interactive "P")
        (when (eq major-mode 'gnus-summary-mode)
          (gnus-summary-select-article-buffer))
        (save-excursion
          (goto-char (point-min))
          (when (or (search-forward-regexp "^Via: h" nil t)
                    (search-forward-regexp "^URL: h" nil t)
                    (and (search-forward-regexp "^Link$" nil t)
                         (not (beginning-of-line))))
            (if external
                (jao-browse-with-external-browser)
              (browse-url (jao-url-around-point))))))

      (defun jao-gnus-open-enclosure ()
        (interactive)
        (save-window-excursion
          (gnus-summary-select-article-buffer)
          (save-excursion
            (goto-char (point-min))
            (when (search-forward "Enclosure:")
              (forward-char 2)
              (when-let ((url (thing-at-point-url-at-point)))
                (jao-browse-add-url-to-mpc url))))))
    #+end_src
* Keyboard shortcuts
  #+begin_src emacs-lisp
    (define-key gnus-article-mode-map "i" 'jao-gnus-show-images)
    (define-key gnus-summary-mode-map "i" 'jao-gnus-show-images)
    (define-key gnus-article-mode-map "\M-g" 'jao-gnus-follow-link)
    (define-key gnus-summary-mode-map "\M-g" 'jao-gnus-follow-link)
    (define-key gnus-summary-mode-map "v" 'scroll-other-window)
    (define-key gnus-summary-mode-map "V" 'scroll-other-window-down)
    (define-key gnus-summary-mode-map "X" 'jao-gnus-arXiv-capture)
    (define-key gnus-summary-mode-map "e" 'jao-gnus-open-enclosure)
    (define-key gnus-summary-mode-map "\C-l" nil)

    (with-eval-after-load "w3m"
      (define-key gnus-article-mode-map "\C-ci" 'w3m-view-image)
      (define-key gnus-article-mode-map "z" 'w3m-lnum-zoom-in-image))

  #+end_src