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;; notmuch-query.el --- provide an emacs api to query notmuch
;;
;; Copyright © David Bremner
;;
;; 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: David Bremner <david@tethera.net>
(require 'notmuch-lib)
(require 'json)
(defun notmuch-query-get-threads (search-terms)
"Return a list of threads of messages matching SEARCH-TERMS.
A thread is a forest or list of trees. A tree is a two element
list where the first element is a message, and the second element
is a possibly empty forest of replies.
"
(let ((args '("show" "--format=json"))
(json-object-type 'plist)
(json-array-type 'list)
(json-false 'nil))
(if notmuch-show-process-crypto
(setq args (append args '("--decrypt"))))
(setq args (append args search-terms))
(with-temp-buffer
(progn
(apply 'call-process (append (list notmuch-command nil (list t nil) nil) args))
(goto-char (point-min))
(json-read)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Mapping functions across collections of messages.
(defun notmuch-query-map-aux (mapper function seq)
"private function to do the actual mapping and flattening"
(apply 'append
(mapcar
(lambda (tree)
(funcall mapper function tree))
seq)))
(defun notmuch-query-map-threads (fn threads)
"apply FN to every thread in THREADS. Flatten results to a list.
See the function notmuch-query-get-threads for more information."
(notmuch-query-map-aux 'notmuch-query-map-forest fn threads))
(defun notmuch-query-map-forest (fn forest)
"apply function to every message in a forest. Flatten results to a list.
See the function notmuch-query-get-threads for more information.
"
(notmuch-query-map-aux 'notmuch-query-map-tree fn forest))
(defun notmuch-query-map-tree (fn tree)
"Apply function FN to every message in TREE. Flatten results to a list
See the function notmuch-query-get-threads for more information."
(cons (funcall fn (car tree)) (notmuch-query-map-forest fn (cadr tree))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Predefined queries
(defun notmuch-query-get-message-ids (&rest search-terms)
"Return a list of message-ids of messages that match SEARCH-TERMS"
(notmuch-query-map-threads
(lambda (msg) (plist-get msg :id))
(notmuch-query-get-threads search-terms)))
(provide 'notmuch-query)
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