;; notmuch-lib.el --- common variables, functions and function declarations
;;
;; Copyright © Carl Worth
;;
;; This file is part of Notmuch.
;;
;; Notmuch 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.
;;
;; Notmuch 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 Notmuch.  If not, see <http://www.gnu.org/licenses/>.
;;
;; Authors: Carl Worth <cworth@cworth.org>

;; This is an part of an emacs-based interface to the notmuch mail system.

(defvar notmuch-command "notmuch"
  "Command to run the notmuch binary.")

(defgroup notmuch nil
  "Notmuch mail reader for Emacs."
  :group 'mail)

(defcustom notmuch-search-oldest-first t
  "Show the oldest mail first when searching."
  :type 'boolean
  :group 'notmuch)

;;

(defcustom notmuch-saved-searches nil
  "A list of saved searches to display."
  :type '(alist :key-type string :value-type string)
  :group 'notmuch)

(defvar notmuch-folders nil
  "Deprecated name for what is now known as `notmuch-saved-searches'.")

(defun notmuch-saved-searches ()
  "Common function for querying the notmuch-saved-searches variable.

We do this as a function to support the old name of the
variable (`notmuch-folders') as well as for the default value if
the user hasn't set this variable with the old or new value."
  (if notmuch-saved-searches
      notmuch-saved-searches
    (if notmuch-folders
	notmuch-folders
      '(("inbox" . "tag:inbox")
	("unread" . "tag:unread")))))

(defun notmuch-version ()
  "Return a string with the notmuch version number."
  (let ((long-string
	 ;; Trim off the trailing newline.
	 (substring (shell-command-to-string
		     (concat notmuch-command " --version"))
		    0 -1)))
    (if (string-match "^notmuch\\( version\\)? \\(.*\\)$"
		      long-string)
	(match-string 2 long-string)
      "unknown")))

(defun notmuch-config-get (item)
  "Return a value from the notmuch configuration."
  ;; Trim off the trailing newline
  (substring (shell-command-to-string
	      (concat notmuch-command " config get " item))
	      0 -1))

(defun notmuch-database-path ()
  "Return the database.path value from the notmuch configuration."
  (notmuch-config-get "database.path"))

(defun notmuch-user-name ()
  "Return the user.name value from the notmuch configuration."
  (notmuch-config-get "user.name"))

(defun notmuch-user-primary-email ()
  "Return the user.primary_email value from the notmuch configuration."
  (notmuch-config-get "user.primary_email"))

;;

;; XXX: This should be a generic function in emacs somewhere, not
;; here.
(defun point-invisible-p ()
  "Return whether the character at point is invisible.

Here visibility is determined by `buffer-invisibility-spec' and
the invisible property of any overlays for point. It doesn't have
anything to do with whether point is currently being displayed
within the current window."
  (let ((prop (get-char-property (point) 'invisible)))
    (if (eq buffer-invisibility-spec t)
	prop
      (or (memq prop buffer-invisibility-spec)
	  (assq prop buffer-invisibility-spec)))))

(provide 'notmuch-lib)