#+TITLE: Mu4e layer

* Table of Contents                                         :TOC_4_gh:noexport:
 - [[#install][Install]]
 - [[#commands][Commands]]
   - [[#global-bindings][Global bindings]]
   - [[#headers-mode][Headers mode]]
   - [[#view-mode][View mode]]
 - [[#configuration][Configuration]]
   - [[#maildirs-extension][Maildirs extension]]
   - [[#multiple-accounts][Multiple Accounts]]
   - [[#example-configuration][Example configuration]]
   - [[#notifications][Notifications]]
     - [[#os-notifications][OS notifications]]
     - [[#mode-line-notifications][Mode-line notifications]]
 - [[#see-also][See also]]

* Install
In order to use this layer you must install mu and mu4e separately. Typically
mu4e will be bundled with mu (this is the case on many Linux distributions).

If you're on OS X and install mu using Homebrew, you must specify the
location of your Emacs binary at install time using the EMACS environment
variable, as well as passing the --with-emacs option:

#+begin_src shell
brew install mu --with-emacs
#+end_src

If the installation directory of mu4e is not in Emacs’ load path, you can set
the layer variable =mu4e-installation-path=, for example:

#+begin_src emacs-lisp
  (setq-default dotspacemacs-configuration-layers
                '((mu4e :variables
                        mu4e-installation-path "/usr/share/emacs/site-lisp")))
#+end_src

Then add this layer to your =~/.spacemacs=. You will need to add =mu4e= to the
existing =dotspacemacs-configuration-layers= list in this file.

* Commands

** Global bindings

| Keybinding | Command    |
|------------+------------|
| SPC a M    | Start mu4e |

** Headers mode

| Keybinding | Command                                                     |
|------------+-------------------------------------------------------------|
| J          | Go to next unread thread marking other mail read on the way |
| C-j        | Next header                                                 |
| C-k        | Previous header                                             |

** View mode

| Keybinding | Command                                                     |
|------------+-------------------------------------------------------------|
| J          | Go to next unread thread marking other mail read on the way |
| C-j        | Next header                                                 |
| C-k        | Previous header                                             |

* Configuration
Configuration varies too much to give precise instructions.  What follows is one
example configuration.  Refer to mu4e's manual for more detailed configuration
instructions.

** Maildirs extension
The maildirs extension adds a list of all your maildirs to the main mu4e view
that by default shows the unread and total mail counts for all your mail under
your base mail directory.

This extension is enabled by default, you can deactivate (and uninstall) it by
adding the package == to your dotfile variable =dotspacemacs-excluded-packages=.

** Multiple Accounts
This layer includes support for multiple sending accounts.
If you have only one account you do not need to define this variable.
If you have multiple accounts, configure the =mu4e-account-alist= variable:

#+BEGIN_SRC emacs-lisp
  (setq mu4e-account-alist
        '(("gmail"
           ;; Under each account, set the account-specific variables you want.
           (mu4e-sent-messages-behavior delete)
           (mu4e-sent-folder "/gmail/[Gmail]/.Sent Mail")
           (mu4e-drafts-folder "/gmail/[Gmail]/.Drafts")
           (user-mail-address "billy@gmail.com")
           (user-full-name "Billy"))
          ("college"
           (mu4e-sent-messages-behavior sent)
           (mu4e-sent-folder "/college/Sent Items")
           (mu4e-drafts-folder "/college/Drafts")
           (user-mail-address "bb15@college.edu")
           (user-full-name "Billy Bob 15"))))
  (mu4e/mail-account-reset)
#+END_SRC

The first account listed will be the default account, so variables like
=user-full-name=, which is used by other parts of Emacs, will have their value
reset for the default account after sending each email.

Note that the mu4e layer expects =mu4e-account-alist= to be defined before the
layer is loaded. For example, you can set =mu4e-account-alist= to a dummy
setting in =dotspacemacs/layers=:

#+BEGIN_SRC emacs-lisp
(mu4e :variables mu4e-account-alist t)
#+END_SRC

and then actually set =mu4e-account-alist= later in =dotspacemacs/user-config=.

Make sure you call =mu4e/mail-account-reset= afterward, which will initialize
the given account variables.

If you have mu 0.9.16 or later, you can use mu4e's built-in contexts feature
instead (see [[http://www.djcbsoftware.nl/code/mu/mu4e/Contexts.html#Contexts][mu4e's manual]]).

** Example configuration
#+BEGIN_SRC emacs-lisp
  ;;; Set up some common mu4e variables
  (setq mu4e-maildir "~/.mail"
        mu4e-trash-folder "/Trash"
        mu4e-refile-folder "/Archive"
        mu4e-get-mail-command "mbsync -a"
        mu4e-update-interval nil
        mu4e-compose-signature-auto-include nil
        mu4e-view-show-images t
        mu4e-view-show-addresses t)

  ;;; Mail directory shortcuts
  (setq mu4e-maildir-shortcuts
        '(("/gmail/INBOX" . ?g)
          ("/college/INBOX" . ?c)))

  ;;; Bookmarks
  (setq mu4e-bookmarks
        `(("flag:unread AND NOT flag:trashed" "Unread messages" ?u)
          ("date:today..now" "Today's messages" ?t)
          ("date:7d..now" "Last 7 days" ?w)
          ("mime:image/*" "Messages with images" ?p)
          (,(mapconcat 'identity
                       (mapcar
                        (lambda (maildir)
                          (concat "maildir:" (car maildir)))
                        mu4e-maildir-shortcuts) " OR ")
           "All inboxes" ?i)))
#+END_SRC

** Notifications
~mu4e-alert~ is an extension that provides desktop notifications and adds the
count of unread messages to the modeline.

[[https://raw.githubusercontent.com/iqbalansari/mu4e-alert/master/screenshots/mu4e-alert-in-action.png]]

For an extended documentation of the available customizations please refer to
[[https://github.com/iqbalansari/mu4e-alert#customizations][mu4e-alert's documentation]]

*** OS notifications
To enable notifications about new messages, add the following line to your
~dotspacemacs/user-config~:

#+BEGIN_SRC emacs-lisp
  (setq mu4e-enable-notifications t)
#+END_SRC

or use layer variables when you add the layer to
=dotspacemacs-configuration-layers=:

#+BEGIN_SRC emacs-lisp
  (mu4e :variables mu4e-enable-notifications t)
#+END_SRC

By default, notifications will be shown in the ~*Messages*~ buffer. To enable
desktop notifications about new messages, add the following lines to
your ~dotspacemacs/user-config~, according to your operating system and the
installed libraries:

#+BEGIN_SRC emacs-lisp
  (with-eval-after-load 'mu4e-alert
    ;; Enable Desktop notifications
    (mu4e-alert-set-default-style 'notifications)) ; For linux
    ;; (mu4e-alert-set-default-style 'libnotify))  ; Alternative for linux
    ;; (mu4e-alert-set-default-style 'notifier))   ; For Mac OSX (through the
                                                   ; terminal notifier app)
    ;; (mu4e-alert-set-default-style 'growl))      ; Alternative for Mac OSX
#+END_SRC

*** Mode-line notifications
To enable mode-line display about new messages, add the following line to
your ~dotspacemacs/user-config~:

#+BEGIN_SRC emacs-lisp
  (setq mu4e-enable-mode-line t)
#+END_SRC

or use layer variables when you add the layer to
=dotspacemacs-configuration-layers=:

#+BEGIN_SRC emacs-lisp
  (mu4e :variables mu4e-enable-mode-line t)
#+END_SRC

* See also
Refer to the official mu and mu4e documentation for additional info.

- [[http://www.djcbsoftware.nl/code/mu/mu4e/index.html][mu4e Manual]]
