mu/mu4e/mu4e-vars.el

;;; mu4e-vars.el -- part of mu4e, the mu mail user agent
;;
;; Copyright (C) 2011-2012 Dirk-Jan C. Binnema

;; Author: Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
;; Maintainer: Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>

;; This file is not part of GNU Emacs.
;;
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs 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 General Public License for more details.

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

;;; Commentary:

;;; Code:

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Customization
(require 'mu4e-meta)
(require 'message)

(defgroup mu4e nil
  "mu4e - mu for emacs"
  :group 'local)

(defcustom mu4e-mu-home nil
  "Location of the mu homedir, or nil for the default."
  :type 'directory
  :group 'mu4e
  :type '(choice (const :tag "Default location" nil)
                 (const :tag "Specify location" string))
  :safe 'stringp)

(defcustom mu4e-mu-binary (executable-find "mu")
  "Name of the mu-binary to use; if it cannot be found in your
PATH, you can specify the full path."
  :type 'file
  :group 'mu4e
  :safe 'stringp)

(defcustom mu4e-maildir (expand-file-name "~/Maildir")
  "Your Maildir directory; by default, mu4e assumes
~/Maildir."
  :type 'directory
  :safe 'stringp
  :group 'mu4e)

(defcustom mu4e-get-mail-command "true"
  "Shell command to run to retrieve new mail; e.g. 'offlineimap' or
'fetchmail'."
  :type 'string
  :group 'mu4e
  :safe 'stringp)

(defcustom mu4e-update-interval nil
  "Number of seconds between automatic calls to retrieve mail and
update the database. If nil, don't update automatically. Note,
changes in `mu4e-update-interval' only take effect after restarting
mu4e."
  :type '(choice (const :tag "No automatic update" nil)
                 (integer :tag "Seconds"))
  :group 'mu4e
  :safe 'integerp)

(defcustom mu4e-attachment-dir (expand-file-name "~/")
  "Default directory for saving attachments. This can be either a
string, or a function that takes a filename FNAME and MIMETYPE as
arguments, and returns the attachment dir. Note, either or both of
the arguments may be `nil'."
  :type 'directory
  :group 'mu4e
  :safe 'stringp)

;; (defcustom mu4e-user-mail-address-regexp "$^"
;;   "Regular expression matching the user's mail address(es). This is
;; used to distinguish ourselves from others, e.g. when replying and
;; in :from-or-to headers. By default, match nothing."
;;   :type 'regexp
;;   :group 'mu4e
;;   :safe 'stringp)

;; (defcustom mu4e-my-email-addresses `(,user-mail-address)
;;   "List of e-mail addresses to consider 'my email addresses',
;; ie. addresses whose presence in an email imply that it is a
;; personal message. This is used when indexing messages."
;;   :type '(repeat (string :tag "Address"))
;;   :group 'mu4e)

(defcustom mu4e-user-mail-address-list `(,user-mail-address)
  "List of e-mail addresses to consider 'my email addresses',
ie. addresses whose presence in an email imply that it is a
personal message. This is used when indexing messages."
  :type '(repeat (string :tag "Address"))
  :group 'mu4e)

;; don't use the older vars anymore
(make-obsolete-variable 'mu4e-user-mail-address-regexp
  'mu4e-user-mail-address-list "0.9.9.x")

(make-obsolete-variable 'mu4e-my-email-addresses
  'mu4e-user-mail-address-list "0.9.9.x")


(defcustom mu4e-use-fancy-chars nil
  "Whether to use fancy (non-ascii) characters."
  :type 'boolean
  :group 'mu4e)


(defvar mu4e-date-format-long "%c"
  "Date format to use in the message view, in the format of
  `format-time-string'.")

(defcustom mu4e-search-results-limit 500
  "Maximum number of search results (or -1 for unlimited). Since
limiting search results speeds up searches significantly, it's
useful to limit this. Note, to ignore the limit, use a prefix
argument (C-u) before invoking the search."
  :type '(choice (const :tag "Unlimited" -1)
                 (integer :tag "Limit"))
  :group 'mu4e)

(defvar mu4e-debug nil
  "When set to non-nil, log debug information to the *mu4e-log* buffer.")

(defvar 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))
  "A list of pre-defined queries; these will show up in the main
screen. Each of the list elements is a three-element list of the
form (QUERY DESCRIPTION KEY), where QUERY is a string with a mu
query, DESCRIPTION is a short description of the query (this will
show up in the UI), and KEY is a shortcut key for the query.")

(defcustom mu4e-split-view 'horizontal
  "How to show messages / headers; a symbol which is either: * a
symbol 'horizontal: split horizontally (headers on top) * a symbol
'vertical: split vertically (headers on the left).  * anything
else: don't split (show either headers or messages, not both) Also
see `mu4e-headers-visible-lines' and
`mu4e-headers-visible-columns'."
  :type '(choice (const :tag "Split horizontally" horizontal)
                 (const :tag "Split vertically" vertical)
                 (const :tag "Don't split" nil)))

(defcustom mu4e-show-images nil
  "Whether to automatically display attached images in the message
view buffer."
  :type 'boolean
  :group 'mu4e-view)

(defcustom mu4e-confirm-quit t
  "Whether to confirm to quit mu4e."
  :type 'boolean
  :group 'mu4e)

;; crypto
(defgroup mu4e-crypto nil
  "Crypto-related settings."
  :group 'mu4e)

(defcustom mu4e-auto-retrieve-keys nil
  "Attempt to automatically retrieve public keys when needed."
  :type 'boolean
  :group 'mu4e-crypto)

(defcustom mu4e-decryption-policy t
  "Policy for dealing with encrypted parts. The setting is a symbol:
 * t:     try to decrypt automatically
 * `ask': ask before decrypting anything
 * nil:   don't try to decrypt anything."
  :type '(choice (const :tag "Try to decrypt automatically" t)
                 (const :tag "Ask before decrypting anything" ask)
                 (const :tag "Don't try to decrypt anything" nil))
  :group 'mu4e-crypto)

;; completion; we put them here rather than in mu4e-compose, as mu4e-utils needs
;; the variables.

(defgroup mu4e-compose nil
  "Message-composition related settings."
  :group 'mu4e)

;; address completion
(defcustom mu4e-compose-complete-addresses t
  "Whether to do auto-completion of e-mail addresses."
  :type 'boolean
  :group 'mu4e-compose)

(defcustom mu4e-compose-complete-only-personal nil
  "Whether to consider only 'personal' e-mail addresses,
i.e. addresses from messages where user was explicitly in one of
the address fields (this excludes mailing list messages). See
`mu4e-my-email-addresses' and the mu-index manpage for details for
details (in particular, how to define your own e-mail addresses)."
  :type 'boolean
  :group 'mu4e-compose)

(defcustom mu4e-compose-complete-only-after "2010-01-01"
  "Consider only contacts last seen after this date. Date must be a
  string, in a format parseable by `org-parse-time-string'. This
  excludes really old contacts. Set to nil to not have any
  time-based restriction."
  :type 'string
  :group 'mu4e-compose)

(defcustom mu4e-compose-complete-ignore-address-regexp "no-?reply"
  "Ignore any e-mail addresses for completion if they match this
regexp."
  :type 'string
  :group 'mu4e-compose)


;; Folders
(defgroup mu4e-folders nil
  "Special folders."
  :group 'mu4e)

(defcustom mu4e-drafts-folder "/drafts"
  "Your folder for draft messages, relative to `mu4e-maildir',
e.g. \"/drafts\". Instead of a string, may also be a function that
takes a message (a msg plist, see `mu4e-message-get-field'), and
returns a folder.  Note, the message parameter refers to the
original message being replied to / being forwarded / re-edited and
is nil otherwise. `mu4e-drafts-folder' is only evaluated once."
  :type 'string
  :safe 'stringp
  :group 'mu4e-folders)

(defcustom mu4e-refile-folder "/archive"
  "Your folder for refiling messages, relative to `mu4e-maildir',
e.g. \"/Archive\". Instead of a string, may also be a function that
takes a message (a msg plist, see `mu4e-message-get-field'), and
returns a folder. Note that the message parameter refers to the
message-at-point."
  :type 'string
  :safe 'stringp
  :group 'mu4e-folders)

(defcustom mu4e-sent-folder "/sent"
  "Your folder for sent messages, relative to `mu4e-maildir',
e.g. \"/Sent Items\". Instead of a string, may also be a function
that takes a message (a msg plist, see `mu4e-message-get-field'),
and returns a folder.  Note that the message parameter refers to
the original message being replied to / being forwarded /
re-edited, and is nil otherwise."
  :type 'string
  :safe 'stringp
  :group 'mu4e-folders)

(defcustom mu4e-trash-folder "/trash"
  "Your folder for trashed messages, relative to `mu4e-maildir',
e.g. \"/trash\". Instead of a string, may also be a function that
takes a message (a msg plist, see `mu4e-message-get-field'), and
returns a folder.  When using `mu4e-trash-folder' in the headers
view (when marking messages for trash). Note that the message
parameter refers to the message-at-point. When using it when
composing a message (see `mu4e-sent-messages-behavior'), this
refers to the original message being replied to / being forwarded /
re-edited, and is nil otherwise."
  :type 'string
  :safe 'stringp
  :group 'mu4e-folders)


(defcustom mu4e-maildir-shortcuts nil
  "A list of maildir shortcuts to enable quickly going to the
 particular for, or quickly moving messages towards them (i.e.,
 archiving or refiling). The list contains elements of the form
 (maildir . shortcut), where MAILDIR is a maildir (such as
\"/archive/\"), and shortcut a single shortcut character. With
this, in the header buffer and view buffer you can execute
`mu4e-mark-for-move-quick' (or 'm', by default) or
`mu4e-jump-to-maildir' (or 'j', by default), followed by the
designated shortcut character for the maildir.")



;; Faces
(defgroup mu4e-faces nil
  "Type faces (fonts) used in mu4e."
  :group 'mu4e
  :group 'faces)

(defface mu4e-unread-face
  '((t :inherit font-lock-keyword-face :bold t))
  "Face for an unread message header."
  :group 'mu4e-faces)

(defface mu4e-moved-face
  '((t :inherit font-lock-comment-face :slant italic))
  "Face for a message header that has been moved to some
folder (it's still visible in the search results, since we cannot
be sure it no longer matches)."
  :group 'mu4e-faces)

(defface mu4e-trashed-face
  '((t :inherit font-lock-comment-face :strike-through t))
  "Face for an message header in the trash folder."
  :group 'mu4e-faces)

(defface mu4e-draft-face
  '((t :inherit font-lock-string-face))
  "Face for a draft message header (i.e., a message with the draft
flag set)."
  :group 'mu4e-faces)

(defface mu4e-flagged-face
  '((t :inherit font-lock-constant-face :bold t))
  "Face for a flagged message header."
  :group 'mu4e-faces)

(defface mu4e-replied-face
  '((t :inherit font-lock-builtin-face :bold nil))
  "Face for a replied (or passed) message header."
  :group 'mu4e-faces)

(defface mu4e-header-face
  '((t :inherit default))
  "Face for a header without any special flags."
  :group 'mu4e-faces)

(defface mu4e-header-title-face
  '((t :inherit font-lock-type-face))
  "Face for a header title in the headers view."
  :group 'mu4e-faces)

(defface mu4e-header-highlight-face
  '((t :inherit default :weight bold :underline t))
  "Face for the header at point."
  :group 'mu4e-faces)

(defface mu4e-header-marks-face
  '((t :inherit font-lock-preprocessor-face))
  "Face for the mark in the headers list."
  :group 'mu4e-faces)

(defface mu4e-view-header-key-face
  '((t :inherit message-header-name :bold t))
  "Face for a header key (such as \"Foo\" in \"Subject:\ Foo\") in
  the message view."
  :group 'mu4e-faces)

(defface mu4e-view-header-value-face
  '((t :inherit font-lock-doc-face))
  "Face for a header value (such as \"Re: Hello!\") in the message
  view."
  :group 'mu4e-faces)

(defface mu4e-view-special-header-value-face
  '((t :inherit font-lock-variable-name-face))
  "Face for special header values in the message view."
  :group 'mu4e-faces)


(defface mu4e-view-link-face
  '((t :inherit link))
  "Face for showing URLs and attachments in the message view."
  :group 'mu4e-faces)

(defface mu4e-view-contact-face
  '((t :inherit font-lock-variable-name-face))
  "Face for showing URLs and attachments in the message view."
  :group 'mu4e-faces)

(defface mu4e-highlight-face
  '((t :inherit font-lock-pseudo-keyword-face :bold t))
  "Face for highlighting things."
  :group 'mu4e-faces)

(defface mu4e-title-face
  '((t :inherit font-lock-type-face :bold t))
  "Face for a header title in the headers view."
  :group 'mu4e-faces)

(defface mu4e-footer-face
  '((t :inherit font-lock-comment-face))
  "Face for message footers (signatures)."
  :group 'mu4e-faces)

(defface mu4e-view-url-number-face
  '((t :inherit font-lock-reference-face :bold t))
  "Face for the number tags for URLs."
  :group 'mu4e-faces)

(defface mu4e-view-attach-number-face
  '((t :inherit font-lock-variable-name-face :bold t))
  "Face for the number tags for attachments."
  :group 'mu4e-faces)

(defface mu4e-cited-1-face
  '((t :inherit font-lock-builtin-face :bold nil :italic t))
  "Face for cited message parts (level 1)."
  :group 'mu4e-faces)

(defface mu4e-cited-2-face
  '((t :inherit font-lock-type-face :bold nil :italic t))
  "Face for cited message parts (level 2)."
  :group 'mu4e-faces)

(defface mu4e-cited-3-face
  '((t :inherit font-lock-variable-name-face :bold nil :italic t))
  "Face for cited message parts (level 3)."
  :group 'mu4e-faces)

(defface mu4e-cited-4-face
  '((t :inherit font-lock-pseudo-keyword-face :bold nil :italic t))
  "Face for cited message parts (level 4)."
  :group 'mu4e-faces)

(defface mu4e-cited-5-face
  '((t :inherit font-lock-comment-face :bold nil :italic t))
  "Face for cited message parts (level 5)."
  :group 'mu4e-faces)

(defface mu4e-cited-6-face
  '((t :inherit font-lock-comment-delimiter-face :bold nil :italic t))
  "Face for cited message parts (level 6)."
  :group 'mu4e-faces)

(defface mu4e-cited-7-face
  '((t :inherit font-lock-preprocessor-face :bold nil :italic t))
  "Face for cited message parts (level 7)."
  :group 'mu4e-faces)


(defface mu4e-system-face
  '((t :inherit font-lock-comment-face :slant italic))
  "Face for system message (such as the footers for message
headers)."
  :group 'mu4e-faces)

(defface mu4e-ok-face
  '((t :inherit font-lock-comment-face :bold t :slant normal))
  "Face for things that are okay."
  :group 'mu4e-faces)

(defface mu4e-warning-face
  '((t :inherit font-lock-warning-face :bold t :slant normal))
  "Face for warnings / error."
  :group 'mu4e-faces)



;; headers info
(defconst mu4e-header-info
  '( (:attachments .
       ( :name "Attachments"
	 :shortname "Atts"
	 :help "Message attachments"
	 :sortable nil))
     (:bcc .
       ( :name "Bcc"
	 :shortname "Bcc"
	 :help "Blind Carbon-Copy recipients for the message"
	 :sortable t))
     (:cc .
       ( :name "Cc"
	 :shortname "Cc"
	 :help "Carbon-Copy recipients for the message"
	 :sortable t))
     (:date .
       ( :name "Date"
	 :shortname "Date"
	 :help "Date/time when the message was written"
	 :sortable t))
     (:human-date .
       ( :name "Date"
	 :shortname "Date"
	 :help "Date/time when the message was written."
	 :sortable t))
     (:flags .
       ( :name "Flags"
	 :shortname "Flgs"
	 :help "Flags for the message"
	 :sortable nil))
     (:from .
       ( :name "From"
	 :shortname "From"
	 :help "The sender of the message"
	 :sortable t))
     (:from-or-to .
       ( :name "From/To"
	 :shortname "From/To"
	 :help "Sender of the message if it's not me; otherwise
	 the recipient"
	 :sortable nil))
     (:maildir .
       ( :name "Maildir"
	 :shortname "Maildir"
	 :help "Maildir for this message"
	 :sortable t))
     (:path .
       ( :name "Path"
	 :shortname "Path"
	 :help "Full filesystem path to the message"
	 :sortable t))
     (:signature .
       ( :name "Signature"
	 :shortname "Sgn"
	 :help "Check for the cryptographic signature"
	 :sortable nil))
     (:size .
       ( :name "Size"
	 :shortname "Size"
	 :help "Size of the message"
	 :sortable t))
     (:subject .
       ( :name "Subject"
	 :shortname "Subject"
	 :help "Subject of the message"
	 :sortable t))
     (:tags .
       ( :name "Tags"
	 :shortname "Tags"
	 :help "Tags for the message"
	 :sortable nil))
     (:to .
       ( :name "To"
	 :shortname "T"
	 :help "Recipient of the message"
	 :sortable t)))
  "An alist of all possible header fields and information about
them.; this is used in the UI (the column headers in the header
list, and the fields the message view). Most fields should be
self-explanatory. A special one is `:from-or-to', which is equal to
`:from' unless `:from' matches `mu4e-user-mail-address-regexp', in
which case it will be equal to `:to'.")


(defvar mu4e-custom-header-info nil
  "A list like `mu4e-custom-header-info', but for
custom (user-specified) headers. Each of the list items is a
property list with :name (the full-name, as displayed in the
message view), :shortname (the name as displayed in the headers
view), :help (some help information, which shows up in the
tooltip). Furthermore, there are two special fields:
:headers-func and :message-func, and the values should be functions
that take a MSG property list as argument, and return a string as
result.
Note, :sortable does not work for custom header fields.")



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;; run-time vars used in multiple places

;; headers
(defconst mu4e~headers-buffer-name "*mu4e-headers*"
  "Name of the buffer for message headers.")
(defvar mu4e~headers-buffer nil "Buffer for message headers.")
; view
(defconst mu4e~view-buffer-name "*mu4e-view*"
  "Name for the message view buffer.")

(defconst mu4e~view-embedded-buffer-name " *mu4e-embedded-view*"
  "Name for the embedded message view buffer.")

(defvar mu4e~view-buffer nil "The view buffer.")

(defvar mu4e~view-msg nil "The message being viewed in view mode.")

(defvar mu4e~contacts-for-completion nil
  "List of contacts (ie. 'name <e-mail>'),
used by the completion functions in mu4e-compose, and filled when
mu4e starts.")

(defvar mu4e~server-props nil
  "Properties we receive from the mu4e server process (in the
  'pong-handler').")

(defvar mu4e~headers-last-query nil
  "The present (most recent) query.")


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;; our handlers funcs
;; these handler funcs define what happens when we receive a certain message
;; from the server
(defun mu4e~default-handler (&rest args)
  "*internal* Dummy handler function."
  (mu4e-error "Not handled: %S" args))

(defvar mu4e-error-func 'mu4e~default-handler
  "A function called for each error returned from the server
process; the function is passed an error plist as argument. See
`mu4e~proc-filter' for the format.")

(defvar mu4e-update-func 'mu4e~default-handler
  "A function called for each :update sexp returned from the server
process; the function is passed a msg sexp as argument. See
`mu4e~proc-filter' for the format.")

(defvar mu4e-remove-func  'mu4e~default-handler
  "A function called for each :remove sexp returned from the server
process, when some message has been deleted. The function is passed
the docid of the removed message.")

(defvar mu4e-sent-func  'mu4e~default-handler
  "A function called for each :sent sexp returned from the server
process, when some message has been sent. The function is passed
the docid and the draft-path of the sent message.")

(defvar mu4e-view-func  'mu4e~default-handler
  "A function called for each single message sexp returned from the
server process. The function is passed a message sexp as
argument. See `mu4e~proc-filter' for the format.")

(defvar mu4e-header-func  'mu4e~default-handler
  "A function called for each message returned from the server
process; the function is passed a msg plist as argument. See
`mu4e~proc-filter' for the format.")

(defvar mu4e-found-func  'mu4e~default-handler
  "A function called for when we received a :found sexp after the
headers have returns, to report on the number of matches. See
`mu4e~proc-filter' for the format.")

(defvar mu4e-erase-func 'mu4e~default-handler
  "A function called for when we received an :erase sexp after the
headers have returns, to clear the current headers buffer. See
`mu4e~proc-filter' for the format.")

(defvar mu4e-compose-func  'mu4e~default-handler
  "A function called for each message returned from the server
process that is used as basis for composing a new message (ie.,
either a reply or a forward); the function is passed msg and a
symbol (either reply or forward). See `mu4e~proc-filter' for the
format of <msg-plist>.")

(defvar mu4e-info-func  'mu4e~default-handler
  "A function called for each (:info type ....) sexp received from
the server process.")

(defvar mu4e-pong-func 'mu4e~default-handler
  "A function called for each (:pong type ....) sexp received from
the server process.")

(defvar mu4e-contacts-func 'mu4e~default-handler
  "A function called for each (:contacts (<list-of-contacts>) sexp
received from the server process.")

(defvar mu4e-temp-func 'mu4e~default-handler
  "A function called for each (:temp <file> <cookie>) sexp received
from the server process.")
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(provide 'mu4e-vars)
;;; End of mu4e-vars.el