#+TITLE:   email/notmuch
#+DATE:    May 5, 2019
#+SINCE:   v2.0
#+STARTUP: inlineimages

* Table of Contents :TOC:
- [[#description][Description]]
  - [[#module-flags][Module Flags]]
  - [[#plugins][Plugins]]
- [[#prerequisites][Prerequisites]]
  - [[#macos][MacOS]]
  - [[#arch-linux][Arch Linux]]
  - [[#nixos][NixOS]]
  - [[#opensuse][openSUSE]]
  - [[#debianubuntu][Debian/Ubuntu]]
- [[#features][Features]]
- [[#configuration][Configuration]]
  - [[#downloading-your-email][Downloading your email]]
  - [[#sending-mail][Sending mail]]
  - [[#customize-notmuch-hello-buffer][Customize =*notmuch-hello*= buffer]]
  - [[#changing-the-notmuch-landing-page][Changing the =notmuch= landing page]]
  - [[#writing-html-emails][Writing HTML Emails]]
- [[#troubleshooting][Troubleshooting]]

* Description
This module turns Emacs into an email client using ~notmuch~.

** Module Flags
+ =+org= Enables org-mime for writing HTML emails using org-mode.
+ =+afew= Enables integration with =afew=.

** Plugins
+ [[https://notmuchmail.org/][notmuch]]
+ [[https://github.com/org-mime/org-mime][org-mime]]* (with =+org= flag)
+ [[https://github.com/fuxialexander/counsel-notmuch][counsel-notmuch]]*
+ [[https://github.com/emacs-helm/helm-notmuch][helm-notmuch]]*

* Prerequisites
This module requires:

+ Either ~[[https://github.com/gauteh/lieer][gmailieer]]~ (default), ~mbsync~ or ~offlineimap~ (to sync mail with)
+ ~[[https://notmuchmail.org/][notmuch]]~, to index and tag your downloaded messages.
+ ~afew~, optionally to initially tag your downloaded messages.
** TODO MacOS

** Arch Linux
Run one of the following commands.

#+BEGIN_SRC sh
pacman -S isync notmuch #mbsync
#+END_SRC
#+BEGIN_SRC sh
pacman -S offlineimap notmuch
#+END_SRC

See: [[https://wiki.archlinux.org/index.php/Notmuch][Arch Wiki - Notmuch]]

** NixOS
#+BEGIN_SRC nix
environment.systemPackages = with pkgs; [
    notmuch
    # And one of the following
    gmailieer
    isync
    offlineimap
];
#+END_SRC

[[https://github.com/Emiller88/dotfiles/blob/319841bd3b89e59b01d169137cceee3183aba4fc/modules/shell/mail.nix][An example of setting up mbsync and notmuch with home-manager]]

** TODO openSUSE
** TODO Debian/Ubuntu

* Features

| Keymap    | Command            | Description                                   |
| ~SPC m u~ | =+notmuch/update=  | Download, sync, and index emails with notmuch |
| ~SPC m c~ | =+notmuch/compose= | Compose new email                             |

* Configuration
** Downloading your email
To download your email you need a sync backend. Out of the box, this module
supports =Gmailier= (the default), =mbsync=, and =offlineimap= (ordered by
speed). You may define a custom one as well. The guides below will walk you
through setting them up with notmuch.

Later, once you've set up a sync backend and downloaded your email, you must
index your email for the first time:

#+BEGIN_SRC sh
notmuch new
#+END_SRC

*** lieer

[[https://github.com/gauteh/lieer][Lieer]], formerly called Gmailieer, is the indexing tool used by default. To install lieer, see the [[https://github.com/gauteh/lieer#installation][installation docs]].

*** offlineimap
To use [[https://www.offlineimap.org/][offlineimap]], change ~+notmuch-sync-backend~:

#+BEGIN_SRC emacs-lisp
;; add to ~/.doom.d/config.el
(setq +notmuch-sync-backend 'offlineimap)
#+END_SRC

Next, write a configuration file for =offlineimap=. [[https://github.com/OfflineIMAP/offlineimap/blob/master/offlineimap.conf][Here is a comprehensive
example]] and [[https://github.com/OfflineIMAP/offlineimap/blob/master/offlineimap.conf.minimal][another minimal one]].

As a real world example, [[https://github.com/hlissner/dotfiles/blob/5f146b6c39552c0cf38025406f5dba7389542b0a/shell/mu/.offlineimaprc][here is my old config]], where it is configured to
download mail to ~\~/.mail~. I used [[https://www.passwordstore.org/][unix pass]] to securely store my login
credentials.

Finally, download your email with ~offlineimap -o~. This may take a while,
especially if you have thousands of emails.

*** mbsync
To use [[https://isync.sourceforge.io/][mbsync]], change ~+notmuch-sync-backend~:

#+BEGIN_SRC emacs-lisp
(setq +notmuch-sync-backend 'mbsync)

;; Use `mbsync-xdg' if your mbsync config lives in $XDG_CONFIG_HOME/isync:
(setq +notmuch-sync-backend 'mbsync-xdg)
#+END_SRC

The steps needed to set up =notmuch= with =mbsync= are similar to the ones for
[[*offlineimap][offlineimap]].

Start with writing a ~\~/.mbsyncrc~ to store your configuration. An example for
GMAIL can be found on the [[https://wiki.archlinux.org/index.php/isync#Configuring][ArchWiki]] which will also explain how its integration
with notmuch for auto synchronization. A non-GMAIL example is available as a
gist [[https://gist.github.com/agraul/60977cc497c3aec44e10591f94f49ef0][here]].

Finally, download your email with ~mbsync --all~. This may take a while, but
will be quicker than =offlineimap=.

*** Custom method
If you have a unique method for synchronizing your email, you can define your
own backend:

#+BEGIN_SRC emacs-lisp
(setq +notmuch-sync-backend 'custom
      ;; Set this to an arbitrary shell command
      +notmuch-sync-command "my-notmuch-sync-cmd")
#+END_SRC
** Sending mail
- [[https://notmuchmail.org/notmuch-emacs/#index6h2][notmuch docs: Sending mail]]
- [[https://notmuchmail.org/emacstips/#index11h2][notmuch docs: msmtp, message mode and multiple accounts]]
- [[https://notmuchmail.org/emacstips/#index12h2][notmuch docs: sending mail using smtpmail]]
** Customize =*notmuch-hello*= buffer
It is possible to change the =*notmuch-hello*= buffer if you want to.

#+BEGIN_SRC emacs-lisp
(after! notmuch
  (setq notmuch-show-log nil
        notmuch-hello-sections `(notmuch-hello-insert-saved-searches
                                 notmuch-hello-insert-alltags)
        ;; To hide headers while composing an email
        notmuch-message-headers-visible nil))
#+END_SRC

** Changing the =notmuch= landing page
You may want to forego the =*notmuch-hello*= buffer by having ~M-x =notmuch~ or
~SPC o m~ take you straight to a search page.

When using ~SPC o m~ the =+notmuch-home-function= is called. By default it uses
the =notmuch= function and so has the same familiar behavior of running a
vanilla install of notmuch-emacs. But, by overwriting this function you can run
a custom search as your landing page.

#+BEGIN_SRC emacs-lisp
(setq +notmuch-home-function (lambda () (notmuch-search "tag:inbox")))
#+END_SRC
** Writing HTML Emails
The [[https://github.com/org-mime/org-mime][org-mime]] package provides functionality for composing emails in org-mode and transforming them to HTML. This feature is enabled using the =+org= flag.

Example use cases:

- To convert an email to an HTML email use ~M-x org-mime-htmlize~
- To compose email using an org-mode editor buffer, use ~M-x org-mime-edit-mail-in-org-mode~

If you'd like to make configuration changes to =org-mime=, you may do so normally. By default the output of =org-mime-htmlize= includes section numbers, a byline, and a table of contents. That's probably more formal than the emails you're used to sending, so here's some example configuration that turns those features off.

/config.el/

#+begin_src emacs-lisp
(after! org-mime
  (setq org-mime-export-options '(:section-numbers nil
                                  :with-author nil
                                  :with-toc nil)))
#+end_src


* TODO Troubleshooting