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#+title: email handling (message mode, bbdb, notmuch, mu4e et al.)
#+property: header-args :tangle no :comments no :results silent :shebang "#!/bin/bash"
#+auto_tangle: t

* message mode
*** Customization
    #+begin_src emacs-lisp
      (defvar jao-mails "")
      (defvar jao-mails-regexp)
      (setq jao-mails-regexp (regexp-opt jao-mails))

      (require 'message)
      (setq message-send-mail-function 'message-send-mail-with-sendmail
            message-sendmail-envelope-from 'header
            message-sendmail-f-is-evil nil)
      (setq imap-store-password t)
      (setq password-cache-expiry nil)
      (setq message-generate-headers-first t)
      (setq message-forward-before-signature nil)
      (setq message-alternative-emails jao-mails-regexp)
      (setq message-dont-reply-to-names
            (format "%s\\|%s" jao-mails-regexp (regexp-opt '("noreply@" "@noreply"
                                                             "no-reply@" "@no-reply"
                                                             "notifications@github"))))
      (setq message-citation-line-format "On %a, %b %d %Y, %N wrote:\n")
      (setq message-citation-line-function 'message-insert-formatted-citation-line)

      (setq message-user-fqdn "gnus.jao.io")

      ;; writing messages
      (setq message-kill-buffer-on-exit t)
      (setq message-max-buffers 5)
      (setq message-insert-signature t)
      (setq message-from-style 'angles
            user-mail-address (car jao-mails)
            mail-host-address system-name
            message-syntax-checks '((sender . disabled))
            message-default-headers
            (concat
             "X-Attribution: jao\n"
             "X-Clacks-Overhead: GNU Terry Pratchett\n"
             "X-URL: <http://jao.io/>\n")
            message-hidden-headers
            '("^References:" "^Face:" "^X-Face:" "^X-Draft-From:")
            message-make-forward-subject-function 'message-forward-subject-fwd)

      (setq message-expand-name-standard-ui t)
    #+end_src
*** Encryption
    #+BEGIN_SRC emacs-lisp
      (require 'gnutls)
      ;; avoiding bogus warning
      (setq gnutls-min-prime-bits nil)
      (setq gnus-buttonized-mime-types
            '("multipart/encrypted" "multipart/signed" "multipart/alternative"))

      (setq mm-verify-option 'always)
      (setq mm-decrypt-option 'always)

      (setq mm-sign-option 'guided)
      (setq mm-encrypt-option 'guided)

      (setq mml-secure-passphrase-cache-expiry (* 3600 24)
            password-cache-expiry (* 3600 24))

      (setq smime-CA-directory "/etc/ssl/certs/"
            smime-certificate-directory"/home/jao/.emacs.d/gnus/Mail/certs/")

      ;; Tells Gnus to inline the part
      (eval-after-load "mm-decode"
        '(add-to-list 'mm-inlined-types "application/pgp$"))
      ;; Tells Gnus how to display the part when it is requested
      (eval-after-load "mm-decode"
        '(add-to-list 'mm-inline-media-tests '("application/pgp$"
                                               mm-inline-text identity)))
      ;; Tell Gnus not to wait for a request, just display the thing
      ;; straight away.
      (eval-after-load "mm-decode"
        '(add-to-list 'mm-automatic-display "application/pgp$"))
      ;; But don't display the signatures, please.
      (eval-after-load "mm-decode"
        (quote (setq mm-automatic-display (remove "application/pgp-signature"
                                                  mm-automatic-display))))

      ;; decide whether to encrypt or just sign outgoing messages
      (defvar jao-message-try-sign nil)
      (defun jao-message-maybe-sign ()
        (when (and jao-message-try-sign (y-or-n-p "Sign message? "))
          (if (y-or-n-p "Encrypt message? ")
              (let ((recipient (message-fetch-field "To")))
                (if (or (pgg-lookup-key recipient)
                        (and (y-or-n-p (format "Fetch %s's key? " recipient))
                             (pgg-fetch-key pgg-default-keyserver-address
                                            recipient)))
                    (mml-secure-message-encrypt-pgp)
                  (mml-secure-message-sign-pgp)))
            (mml-secure-message-sign-pgp))))

      ;; for ma gnus
      (eval-after-load "rfc2047"
        '(add-to-list 'rfc2047-header-encoding-alist
                      '("User-Agent" . address-mime)))

      ;; (define-key message-mode-map [f7] 'mml-secure-message-sign-pgp)
      (define-key message-mode-map [f8] 'mml-secure-message-encrypt-pgp)
    #+END_SRC
*** Attach image to message
    Use ~C-c C-p~ in message-mode.
*** Check attachment
    #+BEGIN_SRC emacs-lisp
      (defvar jao-message-attachment-regexp "\\([Ww]e send\\|[Ii] send\\|attach\\)")
      (defun jao-message-check-attachment ()
        "Check if there is an attachment in the message if I claim it."
        (save-excursion
          (message-goto-body)
          (when (search-forward-regexp jao-message-attachment-regexp nil t nil)
            (message-goto-body)
            (unless (or (search-forward "<#part" nil t nil)
                        (message-y-or-n-p
                         "No attachment. Send the message? " nil nil))
              (error "No message sent")))))
    #+END_SRC
*** Check Fcc/Gcc
    #+begin_src emacs-lisp
      (defun jao-message-check-gcc ()
        "Ask whether to keep a copy of message."
        (save-excursion
          (save-restriction
            (message-narrow-to-headers)
            (when (and (or (message-fetch-field "Gcc")
                           (message-fetch-field "Fcc"))
                       (not (y-or-n-p "Archive? ")))
              (message-remove-header "Gcc")
              (message-remove-header "Fcc")))))
    #+end_src
*** Check recipient
    #+begin_src emacs-lisp
      (defun jao-message-check-recipient ()
        (save-excursion
          (save-restriction
            (message-narrow-to-headers)
            (when-let ((to (message-fetch-field "To")))
              (when (string-match-p jao-mails-regexp to)
                (unless (y-or-n-p "Message is addressed to yourself.  Continue?")
                  (error "Message not sent")))))))
    #+end_src
*** Randomsig
    #+begin_src emacs-lisp
      (when (require 'randomsig nil t)
        (define-key message-mode-map (kbd "C-c s") 'randomsig-replace-sig)
        (define-key message-mode-map (kbd "C-c S") 'randomsig-select-sig)
        (setq randomsig-dir (expand-file-name "~/etc/config/emacs"))
        (setq randomsig-files '("signatures.txt"))
        ;; or (setq randomsig-files (randomsig-search-sigfiles))
        ;; or (setq randomsig-files 'randomsig-search-sigfiles)
        (setq message-signature 'randomsig-signature)
        (setq randomsig-delimiter-pattern "^%$"
              randomsig-delimiter "%"))
    #+end_src
*** Send mail hooks
    #+begin_src emacs-lisp
      (dolist (h '(jao-message-check-gcc
                   jao-message-check-attachment
                   jao-message-check-recipient
                   jao-message-maybe-sign))
        (add-hook 'message-send-hook h))
    #+end_src
* sendmail/smtp
  #+begin_src emacs-lisp
    (require 'smtpmail)

    (defun jao-sendmail-gmail ()
      (setq smtpmail-auth-supported '(login cram-md5 plain))
      (setq smtpmail-smtp-server "smtp.gmail.com")
      (setq smtpmail-smtp-service 587))

    (defun jao-sendmail-local ()
      (setq smtpmail-auth-supported nil) ;; (cram-md5 plain login)
      (setq smtpmail-smtp-server "127.0.0.1")
      (setq smtpmail-smtp-service 25))

    (jao-sendmail-local)
  #+end_src
* mailcap
  #+begin_src emacs-lisp
    (use-package mailcap

      :config
      (add-to-list 'mailcap-mime-extensions '(".JPEG" . "image/jpeg"))
      (add-to-list 'mailcap-mime-extensions '(".JPG" . "image/jpeg"))

      (defun jao-icalendar-import-buffer ()
        (let ((icalendar-import-format "%s%u%l"))
          (icalendar-import-buffer diary-file))
        (kill-buffer))

      :custom ((mailcap-user-mime-data
                '((doc-view-mode "application/pdf" jao-browse-doc-use-emacs-p)
                  (jao-icalendar-import-buffer "application/ics")
                  ("zathura %s" "application/pdf")))))
  #+end_src
* bbdb
  #+begin_src emacs-lisp
    (use-package bbdb
      :ensure t
      :init (setq bbdb-complete-name-allow-cycling t
                  bbdb-completion-display-record nil
                  bbdb-gui t
                  bbdb-message-all-addresses t
                  bbdb-complete-mail-allow-cycling t
                  bbdb-north-american-phone-numbers-p nil
                  bbdb-add-aka t
                  bbdb-add-name 2
                  bbdb-message-all-addresses t
                  bbdb-mua-pop-up t ;; 'horiz
                  bbdb-mua-pop-up-window-size 0.3
                  bbdb-layout 'multi-line
                  bbdb-mua-update-interactive-p '(query . create)
                  bbdb-mua-auto-update-p 'bbdb-select-message
                  bbdb-user-mail-address-re jao-mails-regexp
                  bbdb-auto-notes-ignore-headers
                  `(("From" . ,jao-mails-regexp)
                    ("From" . ".*@.*github\.com.*")
                    ("To" . ".*@.*github\.com.*")
                    ("Reply-to" . ".*")
                    ("References" . ".*"))
                  bbdb-auto-notes-ignore-messages
                  `(("To" . ".*@.*github\\.com.*")
                    ("From" . ".*@.*github\\.com.*")
                    ("From" . "info-list")
                    ("From" . "no-?reply\\|deploy")
                    ("X-Mailer" . "MailChimp"))
                  bbdb-accept-message-alist
                  `(("To" . ,jao-mails-regexp)
                    ("Cc" . ,jao-mails-regexp)
                    ("BCc" . ,jao-mails-regexp))
                  bbdb-ignore-message-alist bbdb-auto-notes-ignore-messages)
      :config
      (add-hook 'message-setup-hook 'bbdb-mail-aliases)
      ;; (add-hook 'bbdb-notice-mail-hook 'bbdb-auto-notes)
      (add-hook 'bbdb-after-change-hook (lambda (arg) (bbdb-save)))
      (require 'bbdb-anniv) ;; BBDB 3.x this gets birthdays in org agenda
                            ;; and diary - clever stuff
      (add-hook 'diary-list-entries-hook 'bbdb-anniv-diary-entries))

    (require 'bbdb)
    (setq bbdb-file (expand-file-name "~/.emacs.d/bbdb"))
    (bbdb-initialize 'message 'pgp 'mail)
   #+end_src
* mailboxes
  #+begin_src emacs-lisp
    (defun jao-list-mailboxes (base)
      (let ((dir (expand-file-name base "~/var/mail")))
        (seq-difference (directory-files dir)
                        '("." ".." "sent" "inbox" "trash"))))
  #+end_src
* gnus
*** Directories
    #+begin_src emacs-lisp
      (setq gnus-init-file "~/.emacs.d/gnus.el"
            gnus-home-directory "~/.emacs.d/gnus"
            gnus-directory gnus-home-directory)
    #+end_src
*** Notifications
    #+begin_src emacs-lisp
      (defun jao-gnus-notify ()
        (interactive)
        (when (fboundp 'jao-gnus--notify)
          (unless (derived-mode-p 'gnus-summary-mode
                                  'gnus-article-mode
                                  'gnus-group-mode)
            (let ((inhibit-message t))
              (gnus-demon-scan-news)))))
    #+end_src
* notmuch
*** package
    #+begin_src emacs-lisp
      (use-package notmuch
        :ensure t
        :init
        (setq notmuch-hello-sections '(notmuch-hello-insert-saved-searches
                                       notmuch-hello-insert-alltags
                                       notmuch-hello-insert-header)
              notmuch-hello-thousands-separator ","
              notmuch-show-all-tags-list t
              notmuch-show-logo nil
              notmuch-show-empty-saved-searches nil
              notmuch-show-mark-read-tags '("-new" "-unread")
              notmuch-archive-tags '("+trove" "-new" "-unread" "-flagged")
              notmuch-fcc-dirs
              '((".*@bigml.com" . "trove/bigml +bigml +sent -new")
                (".*" . "trove/jao +jao +sent -new"))
              notmuch-maildir-use-notmuch-insert t)
        :bind (:map notmuch-hello-mode-map (("S" . consult-notmuch)
                                            ("SPC" . widget-button-press))))
    #+end_src
*** searches
    #+begin_src emacs-lisp
      (setq notmuch-search-result-format
            '(("date" . "%12s ")
              ("count" . "%-7s ")
              ("authors" . "%-35s")
              ("subject" . "%-100s")
              ("tags" . "(%s)")))

      (defun jao-notmuch--q (d0 d1 &optional k qs)
        (let ((q (or (when qs (mapconcat #'identity qs " AND "))
                     (format "folder:%s/%s and tag:unread" d0 d1))))
          (list :name (concat d0 (when d1 "/") d1)
                :key k :query q
                :sort-order 'oldest-first)))

      (defun jao-notmuch--mboxes-search (box &rest excluded)
        (let ((ms (seq-difference (jao-list-mailboxes box) excluded))
              (bp (substring box 0 1)))
          (mapcar `(lambda (m)
                     (jao-notmuch--q ,box (car m) (concat ,bp (cdr m))))
                  (shorten-strings (sort ms #'string<)))))

      (setq notmuch-saved-searches
            `(,(jao-notmuch--q "bigml" "inbox" "bi")
              ,@(jao-notmuch--mboxes-search "bigml" "inbox" "deploys")
              ,(jao-notmuch--q "jao" "inbox" "ji")
              ,@(jao-notmuch--mboxes-search "jao" "inbox")
              ,@(jao-notmuch--mboxes-search "feeds")
              ,(jao-notmuch--q "bml/today" nil "tb" '("tag:bigml" "date:1d.."))
              ,(jao-notmuch--q "jao/today" nil "tj" '("tag:jao" "date:1d.."))
              ,(jao-notmuch--q "flagged" nil "r" '("tag:flagged"))
              ,(jao-notmuch--q "new" nil "n" '("tag:new"))
              ,(jao-notmuch--q "draft" nil "d" '("tag:draft"))))
    #+end_src
*** consult
    #+begin_src emacs-lisp
      (use-package consult-notmuch
        :ensure t
        :init (setq consult-notmuch-authors-width 30)
        :config
        (add-to-list 'consult-config '(consult-notmuch :preview-key any))
        (add-to-list 'consult-buffer-sources 'consult-notmuch-buffer-source))

      (defvar jao-consult-notmuch-folders
        (seq-mapcat (lambda (base)
                      (mapcar `(lambda (d) (format "%s/%s" ,base d))
                              (jao-list-mailboxes base)))
                    '("jao" "bigml" "feeds" "trove")))

      (defvar jao-consult-notmuch-history nil)

      (defun jao-consult-notmuch-folder (&optional tree folder)
        (interactive "P")
        (let* ((root "~/var/mail/")
               (folder (if folder
                           (file-name-as-directory folder)
                         (completing-read "Folder: "
                                          jao-consult-notmuch-folders
                                          nil nil nil
                                          jao-consult-notmuch-history
                                          ".")))
               (folder (replace-regexp-in-string "/\\(.\\)" ".\\1" folder))
               (init (read-string "Initial query: "))
               (init (format "folder:/%s/ %s" folder init)))
          (if tree (consult-notmuch-tree init) (consult-notmuch init))))
    #+end_src
*** org mode integration
    Stolen and adapted from [[https://gist.github.com/fedxa/fac592424473f1b70ea489cc64e08911][Fedor Bezrukov]].
    #+begin_src emacs-lisp
      (with-eval-after-load "org"
        (with-eval-after-load "notmuch"
          (org-link-set-parameters "notmuch"
                                   :follow 'org-notmuch-open
                                   :store 'org-notmuch-store-link)

         (defun org-notmuch-open (id)
           "Visit the notmuch message or thread with id ID."
           (notmuch-show id))

         (defun org-notmuch-store-link ()
           "Store a link to a notmuch mail message."
           (case major-mode
             ((notmuch-show-mode notmuch-tree-mode)
              ;; Store link to the current message
              (let* ((id (notmuch-show-get-message-id))
                     (link (concat "notmuch:" id))
                     (description (format "Mail: %s"
                                          (notmuch-show-get-subject))))
                (org-store-link-props
	         :type "notmuch"
	         :link link
	         :description description)))
             (notmuch-search-mode
              ;; Store link to the thread on the current line
              (let* ((id (notmuch-search-find-thread-id))
                     (link (concat "notmuch:" id))
                     (description (format "Mail: %s"
                                          (notmuch-search-find-subject))))
                (org-store-link-props
                 :type "notmuch"
                 :link link
                 :description description)))))))
    #+end_src
*** tag shell script
    #+begin_src bash :tangle ./bin/notmuch-tags.sh :tangle-mode (identity #o755)
      notmuch new > $HOME/var/log/notmuch.log 2>&1

      function tag_deleted {
        notmuch tag +deleted -- \
                "folder:\"/$1/\"" AND date:..${2:-3d} \
                AND NOT "tag:\"/^(trove|new|flagged|unread)$/\""
      }

      function tag_folder {
        notmuch tag +$1 +$2 -- tag:new AND folder:$1/$2
      }

      function tag_directory {
        for f in ~/var/mail/$1/*; do
          tag_folder $1 $(basename $f);
        done
      }

      tag_directory bigml
      tag_directory jao
      tag_directory feeds

      notmuch tag +gmane -- tag:new AND folder:/gmane/

      tag_deleted "bigml.(drivel|lists|deploys|bugs)" 3d
      tag_deleted "bigml.reports" 1d
      tag_deleted "bigml.support$" 7d
      tag_deleted "jao.(drivel|lists|books|think)" 3d
      tag_deleted "feeds.+" 3d

      notmuch tag +deleted +trash -new -unread -- "folder:trash and tag:new"
    #+end_src
*** delete tagged shell script
    #+begin_src bash :tangle ./bin/notmuch-expire.sh :tangle-mode (identity #o755)
      notmuch search --output=files --format=text0 tag:deleted | xargs -r0 rm
      notmuch new > $HOME/var/log/notmuch-expire.log 2>&1
      notmuch compact >> $HOME/var/log/notmuch-expire.log 2>&1
    #+end_src