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;; notmuch.el --- run notmuch within emacs
;;
;; 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 emacs-based interface to the notmuch mail system.
;;
;; You will first need to have the notmuch program installed and have a
;; notmuch database built in order to use this. See
;; http://notmuchmail.org for details.
;;
;; To install this software, copy it to a directory that is on the
;; `load-path' variable within emacs (a good candidate is
;; /usr/local/share/emacs/site-lisp). If you are viewing this from the
;; notmuch source distribution then you can simply run:
;;
;;	sudo make install-emacs
;;
;; to install it.
;;
;; Then, to actually run it, add:
;;
;;	(require 'notmuch)
;;
;; to your ~/.emacs file, and then run "M-x notmuch" from within emacs,
;; or run:
;;
;;	emacs -f notmuch
;;
;; Have fun, and let us know if you have any comment, questions, or
;; kudos: Notmuch list <notmuch@notmuchmail.org> (subscription is not
;; required, but is available from http://notmuchmail.org).

(eval-when-compile (require 'cl))
(require 'mm-view)
(require 'message)

(require 'notmuch-lib)
(require 'notmuch-tag)
(require 'notmuch-show)
(require 'notmuch-mua)
(require 'notmuch-hello)
(require 'notmuch-maildir-fcc)
(require 'notmuch-message)

(defcustom notmuch-search-result-format
  `(("date" . "%12s ")
    ("count" . "%-7s ")
    ("authors" . "%-20s ")
    ("subject" . "%s ")
    ("tags" . "(%s)"))
  "Search result formatting. Supported fields are:
	date, count, authors, subject, tags
For example:
	(setq notmuch-search-result-format \(\(\"authors\" . \"%-40s\"\)
					     \(\"subject\" . \"%s\"\)\)\)
Line breaks are permitted in format strings (though this is
currently experimental).  Note that a line break at the end of an
\"authors\" field will get elided if the authors list is long;
place it instead at the beginning of the following field.  To
enter a line break when setting this variable with setq, use \\n.
To enter a line break in customize, press \\[quoted-insert] C-j."
  :type '(alist :key-type (string) :value-type (string))
  :group 'notmuch-search)

(defvar notmuch-query-history nil
  "Variable to store minibuffer history for notmuch queries")

(defun notmuch-foreach-mime-part (function mm-handle)
  (cond ((stringp (car mm-handle))
         (dolist (part (cdr mm-handle))
           (notmuch-foreach-mime-part function part)))
        ((bufferp (car mm-handle))
         (funcall function mm-handle))
        (t (dolist (part mm-handle)
             (notmuch-foreach-mime-part function part)))))

(defun notmuch-count-attachments (mm-handle)
  (let ((count 0))
    (notmuch-foreach-mime-part
     (lambda (p)
       (let ((disposition (mm-handle-disposition p)))
         (and (listp disposition)
              (or (equal (car disposition) "attachment")
                  (and (equal (car disposition) "inline")
                       (assq 'filename disposition)))
              (incf count))))
     mm-handle)
    count))

(defun notmuch-save-attachments (mm-handle &optional queryp)
  (notmuch-foreach-mime-part
   (lambda (p)
     (let ((disposition (mm-handle-disposition p)))
       (and (listp disposition)
            (or (equal (car disposition) "attachment")
                (and (equal (car disposition) "inline")
                     (assq 'filename disposition)))
            (or (not queryp)
                (y-or-n-p
                 (concat "Save '" (cdr (assq 'filename disposition)) "' ")))
            (mm-save-part p))))
   mm-handle))

(defun notmuch-documentation-first-line (symbol)
  "Return the first line of the documentation string for SYMBOL."
  (let ((doc (documentation symbol)))
    (if doc
	(with-temp-buffer
	  (insert (documentation symbol t))
	  (goto-char (point-min))
	  (let ((beg (point)))
	    (end-of-line)
	    (buffer-substring beg (point))))
      "")))

(defun notmuch-prefix-key-description (key)
  "Given a prefix key code, return a human-readable string representation.

This is basically just `format-kbd-macro' but we also convert ESC to M-."
  (let ((desc (format-kbd-macro (vector key))))
    (if (string= desc "ESC")
	"M-"
      (concat desc " "))))

;; I would think that emacs would have code handy for walking a keymap
;; and generating strings for each key, and I would prefer to just call
;; that. But I couldn't find any (could be all implemented in C I
;; suppose), so I wrote my own here.
(defun notmuch-substitute-one-command-key-with-prefix (prefix binding)
  "For a key binding, return a string showing a human-readable
representation of the prefixed key as well as the first line of
documentation from the bound function.

For a mouse binding, return nil."
  (let ((key (car binding))
	(action (cdr binding)))
    (if (mouse-event-p key)
	nil
      (if (keymapp action)
	  (let ((substitute (apply-partially 'notmuch-substitute-one-command-key-with-prefix (notmuch-prefix-key-description key)))
		(as-list))
	    (map-keymap (lambda (a b)
			  (push (cons a b) as-list))
			action)
	    (mapconcat substitute as-list "\n"))
	(concat prefix (format-kbd-macro (vector key))
		"\t"
		(notmuch-documentation-first-line action))))))

(defun notmuch-substitute-command-keys-one (key)
  ;; A `keymap' key indicates inheritance from a parent keymap - the
  ;; inherited mappings follow, so there is nothing to print for
  ;; `keymap' itself.
  (when (not (eq key 'keymap))
    (notmuch-substitute-one-command-key-with-prefix nil key)))

(defun notmuch-substitute-command-keys (doc)
  "Like `substitute-command-keys' but with documentation, not function names."
  (let ((beg 0))
    (while (string-match "\\\\{\\([^}[:space:]]*\\)}" doc beg)
      (let* ((keymap-name (substring doc (match-beginning 1) (match-end 1)))
	     (keymap (symbol-value (intern keymap-name))))
	(setq doc (replace-match
		   (mapconcat #'notmuch-substitute-command-keys-one
			      (cdr keymap) "\n")
		   1 1 doc)))
      (setq beg (match-end 0)))
    doc))

(defun notmuch-help ()
  "Display help for the current notmuch mode."
  (interactive)
  (let* ((mode major-mode)
	 (doc (substitute-command-keys (notmuch-substitute-command-keys (documentation mode t)))))
    (with-current-buffer (generate-new-buffer "*notmuch-help*")
      (insert doc)
      (goto-char (point-min))
      (set-buffer-modified-p nil)
      (view-buffer (current-buffer) 'kill-buffer-if-not-modified))))

(require 'hl-line)

(defun notmuch-hl-line-mode ()
  (prog1 (hl-line-mode)
    (when hl-line-overlay
      (overlay-put hl-line-overlay 'priority 1))))

(defcustom notmuch-search-hook '(notmuch-hl-line-mode)
  "List of functions to call when notmuch displays the search results."
  :type 'hook
  :options '(notmuch-hl-line-mode)
  :group 'notmuch-search
  :group 'notmuch-hooks)

(defvar notmuch-search-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "?" 'notmuch-help)
    (define-key map "q" 'notmuch-search-quit)
    (define-key map "x" 'notmuch-search-quit)
    (define-key map (kbd "<DEL>") 'notmuch-search-scroll-down)
    (define-key map "b" 'notmuch-search-scroll-down)
    (define-key map " " 'notmuch-search-scroll-up)
    (define-key map "<" 'notmuch-search-first-thread)
    (define-key map ">" 'notmuch-search-last-thread)
    (define-key map "p" 'notmuch-search-previous-thread)
    (define-key map "n" 'notmuch-search-next-thread)
    (define-key map "r" 'notmuch-search-reply-to-thread-sender)
    (define-key map "R" 'notmuch-search-reply-to-thread)
    (define-key map "m" 'notmuch-mua-new-mail)
    (define-key map "s" 'notmuch-search)
    (define-key map "o" 'notmuch-search-toggle-order)
    (define-key map "c" 'notmuch-search-stash-map)
    (define-key map "=" 'notmuch-search-refresh-view)
    (define-key map "G" 'notmuch-search-poll-and-refresh-view)
    (define-key map "t" 'notmuch-search-filter-by-tag)
    (define-key map "f" 'notmuch-search-filter)
    (define-key map [mouse-1] 'notmuch-search-show-thread)
    (define-key map "*" 'notmuch-search-tag-all)
    (define-key map "a" 'notmuch-search-archive-thread)
    (define-key map "-" 'notmuch-search-remove-tag)
    (define-key map "+" 'notmuch-search-add-tag)
    (define-key map (kbd "RET") 'notmuch-search-show-thread)
    map)
  "Keymap for \"notmuch search\" buffers.")
(fset 'notmuch-search-mode-map notmuch-search-mode-map)

(defvar notmuch-search-stash-map
  (let ((map (make-sparse-keymap)))
    (define-key map "i" 'notmuch-search-stash-thread-id)
    map)
  "Submap for stash commands")
(fset 'notmuch-search-stash-map notmuch-search-stash-map)

(defun notmuch-search-stash-thread-id ()
  "Copy thread ID of current thread to kill-ring."
  (interactive)
  (notmuch-common-do-stash (notmuch-search-find-thread-id)))

(defvar notmuch-search-query-string)
(defvar notmuch-search-target-thread)
(defvar notmuch-search-target-line)
(defvar notmuch-search-continuation)

(defvar notmuch-search-disjunctive-regexp      "\\<[oO][rR]\\>")

(defun notmuch-search-quit ()
  "Exit the search buffer, calling any defined continuation function."
  (interactive)
  (let ((continuation notmuch-search-continuation))
    (notmuch-kill-this-buffer)
    (when continuation
      (funcall continuation))))

(defun notmuch-search-scroll-up ()
  "Move forward through search results by one window's worth."
  (interactive)
  (condition-case nil
      (scroll-up nil)
    ((end-of-buffer) (notmuch-search-last-thread))))

(defun notmuch-search-scroll-down ()
  "Move backward through the search results by one window's worth."
  (interactive)
  ;; I don't know why scroll-down doesn't signal beginning-of-buffer
  ;; the way that scroll-up signals end-of-buffer, but c'est la vie.
  ;;
  ;; So instead of trapping a signal we instead check whether the
  ;; window begins on the first line of the buffer and if so, move
  ;; directly to that position. (We have to count lines since the
  ;; window-start position is not the same as point-min due to the
  ;; invisible thread-ID characters on the first line.
  (if (equal (count-lines (point-min) (window-start)) 0)
      (goto-char (point-min))
    (scroll-down nil)))

(defun notmuch-search-next-thread ()
  "Select the next thread in the search results."
  (interactive)
  (when (notmuch-search-get-result)
    (goto-char (notmuch-search-result-end))))

(defun notmuch-search-previous-thread ()
  "Select the previous thread in the search results."
  (interactive)
  (if (notmuch-search-get-result)
      (unless (bobp)
	(goto-char (notmuch-search-result-beginning (- (point) 1))))
    ;; We must be past the end; jump to the last result
    (notmuch-search-last-thread)))

(defun notmuch-search-last-thread ()
  "Select the last thread in the search results."
  (interactive)
  (goto-char (point-max))
  (forward-line -2)
  (let ((beg (notmuch-search-result-beginning)))
    (when beg (goto-char beg))))

(defun notmuch-search-first-thread ()
  "Select the first thread in the search results."
  (interactive)
  (goto-char (point-min)))

(defface notmuch-message-summary-face
 '((((class color) (background light)) (:background "#f0f0f0"))
   (((class color) (background dark)) (:background "#303030")))
 "Face for the single-line message summary in notmuch-show-mode."
 :group 'notmuch-show
 :group 'notmuch-faces)

(defface notmuch-search-date
  '((t :inherit default))
  "Face used in search mode for dates."
  :group 'notmuch-search
  :group 'notmuch-faces)

(defface notmuch-search-count
  '((t :inherit default))
  "Face used in search mode for the count matching the query."
  :group 'notmuch-search
  :group 'notmuch-faces)

(defface notmuch-search-subject
  '((t :inherit default))
  "Face used in search mode for subjects."
  :group 'notmuch-search
  :group 'notmuch-faces)

(defface notmuch-search-matching-authors
  '((t :inherit default))
  "Face used in search mode for authors matching the query."
  :group 'notmuch-search
  :group 'notmuch-faces)

(defface notmuch-search-non-matching-authors
  '((((class color)
      (background dark))
     (:foreground "grey30"))
    (((class color)
      (background light))
     (:foreground "grey60"))
    (t
     (:italic t)))
  "Face used in search mode for authors not matching the query."
  :group 'notmuch-search
  :group 'notmuch-faces)

(defface notmuch-tag-face
  '((((class color)
      (background dark))
     (:foreground "OliveDrab1"))
    (((class color)
      (background light))
     (:foreground "navy blue" :bold t))
    (t
     (:bold t)))
  "Face used in search mode face for tags."
  :group 'notmuch-search
  :group 'notmuch-faces)

(defun notmuch-search-mode ()
  "Major mode displaying results of a notmuch search.

This buffer contains the results of a \"notmuch search\" of your
email archives. Each line in the buffer represents a single
thread giving a summary of the thread (a relative date, the
number of matched messages and total messages in the thread,
participants in the thread, a representative subject line, and
any tags).

Pressing \\[notmuch-search-show-thread] on any line displays that thread. The '\\[notmuch-search-add-tag]' and '\\[notmuch-search-remove-tag]'
keys can be used to add or remove tags from a thread. The '\\[notmuch-search-archive-thread]' key
is a convenience for archiving a thread (removing the \"inbox\"
tag). The '\\[notmuch-search-tag-all]' key can be used to add and/or remove tags from all
messages (as opposed to threads) that match the current query.  Use with caution, as this
will also tag matching messages that arrived *after* constructing the buffer.

Other useful commands are '\\[notmuch-search-filter]' for filtering the current search
based on an additional query string, '\\[notmuch-search-filter-by-tag]' for filtering to include
only messages with a given tag, and '\\[notmuch-search]' to execute a new, global
search.

Complete list of currently available key bindings:

\\{notmuch-search-mode-map}"
  (interactive)
  (kill-all-local-variables)
  (make-local-variable 'notmuch-search-query-string)
  (make-local-variable 'notmuch-search-oldest-first)
  (make-local-variable 'notmuch-search-target-thread)
  (make-local-variable 'notmuch-search-target-line)
  (set (make-local-variable 'notmuch-search-continuation) nil)
  (set (make-local-variable 'scroll-preserve-screen-position) t)
  (add-to-invisibility-spec (cons 'ellipsis t))
  (use-local-map notmuch-search-mode-map)
  (setq truncate-lines t)
  (setq major-mode 'notmuch-search-mode
	mode-name "notmuch-search")
  (setq buffer-read-only t))

(defun notmuch-search-get-result (&optional pos)
  "Return the result object for the thread at POS (or point).

If there is no thread at POS (or point), returns nil."
  (get-text-property (or pos (point)) 'notmuch-search-result))

(defun notmuch-search-result-beginning (&optional pos)
  "Return the point at the beginning of the thread at POS (or point).

If there is no thread at POS (or point), returns nil."
  (when (notmuch-search-get-result pos)
    ;; We pass 1+point because previous-single-property-change starts
    ;; searching one before the position we give it.
    (previous-single-property-change (1+ (or pos (point)))
				     'notmuch-search-result nil (point-min))))

(defun notmuch-search-result-end (&optional pos)
  "Return the point at the end of the thread at POS (or point).

The returned point will be just after the newline character that
ends the result line.  If there is no thread at POS (or point),
returns nil"
  (when (notmuch-search-get-result pos)
    (next-single-property-change (or pos (point)) 'notmuch-search-result
				 nil (point-max))))

(defun notmuch-search-foreach-result (beg end function)
  "Invoke FUNCTION for each result between BEG and END.

FUNCTION should take one argument.  It will be applied to the
character position of the beginning of each result that overlaps
the region between points BEG and END.  As a special case, if (=
BEG END), FUNCTION will be applied to the result containing point
BEG."

  (lexical-let ((pos (notmuch-search-result-beginning beg))
		;; End must be a marker in case function changes the
		;; text.
		(end (copy-marker end))
		;; Make sure we examine at least one result, even if
		;; (= beg end).
		(first t))
    ;; We have to be careful if the region extends beyond the results.
    ;; In this case, pos could be null or there could be no result at
    ;; pos.
    (while (and pos (or (< pos end) first))
      (when (notmuch-search-get-result pos)
	(funcall function pos))
      (setq pos (notmuch-search-result-end pos)
	    first nil))))
;; Unindent the function argument of notmuch-search-foreach-result so
;; the indentation of callers doesn't get out of hand.
(put 'notmuch-search-foreach-result 'lisp-indent-function 2)

(defun notmuch-search-properties-in-region (property beg end)
  (let (output)
    (notmuch-search-foreach-result beg end
      (lambda (pos)
	(push (plist-get (notmuch-search-get-result pos) property) output)))
    output))

(defun notmuch-search-find-thread-id (&optional bare)
  "Return the thread for the current thread

If BARE is set then do not prefix with \"thread:\""
  (let ((thread (plist-get (notmuch-search-get-result) :thread)))
    (when thread (concat (unless bare "thread:") thread))))

(defun notmuch-search-find-thread-id-region (beg end)
  "Return a list of threads for the current region"
  (mapcar (lambda (thread) (concat "thread:" thread))
	  (notmuch-search-properties-in-region :thread beg end)))

(defun notmuch-search-find-thread-id-region-search (beg end)
  "Return a search string for threads for the current region"
  (mapconcat 'identity (notmuch-search-find-thread-id-region beg end) " or "))

(defun notmuch-search-find-authors ()
  "Return the authors for the current thread"
  (plist-get (notmuch-search-get-result) :authors))

(defun notmuch-search-find-authors-region (beg end)
  "Return a list of authors for the current region"
  (notmuch-search-properties-in-region :authors beg end))

(defun notmuch-search-find-subject ()
  "Return the subject for the current thread"
  (plist-get (notmuch-search-get-result) :subject))

(defun notmuch-search-find-subject-region (beg end)
  "Return a list of authors for the current region"
  (notmuch-search-properties-in-region :subject beg end))

(defun notmuch-search-show-thread ()
  "Display the currently selected thread."
  (interactive)
  (let ((thread-id (notmuch-search-find-thread-id))
	(subject (notmuch-search-find-subject)))
    (if (> (length thread-id) 0)
	(notmuch-show thread-id
		      (current-buffer)
		      notmuch-search-query-string
		      ;; Name the buffer based on the subject.
		      (concat "*" (truncate-string-to-width subject 30 nil nil t) "*"))
      (message "End of search results."))))

(defun notmuch-search-reply-to-thread (&optional prompt-for-sender)
  "Begin composing a reply-all to the entire current thread in a new buffer."
  (interactive "P")
  (let ((message-id (notmuch-search-find-thread-id)))
    (notmuch-mua-new-reply message-id prompt-for-sender t)))

(defun notmuch-search-reply-to-thread-sender (&optional prompt-for-sender)
  "Begin composing a reply to the entire current thread in a new buffer."
  (interactive "P")
  (let ((message-id (notmuch-search-find-thread-id)))
    (notmuch-mua-new-reply message-id prompt-for-sender nil)))

(defun notmuch-call-notmuch-process (&rest args)
  "Synchronously invoke \"notmuch\" with the given list of arguments.

If notmuch exits with a non-zero status, output from the process
will appear in a buffer named \"*Notmuch errors*\" and an error
will be signaled."
  (with-temp-buffer
    (let ((status (apply #'call-process notmuch-command nil t nil args)))
      (notmuch-check-exit-status status (cons notmuch-command args)
				 (buffer-string)))))

(defun notmuch-search-set-tags (tags &optional pos)
  (let ((new-result (plist-put (notmuch-search-get-result pos) :tags tags)))
    (notmuch-search-update-result new-result pos)))

(defun notmuch-search-get-tags (&optional pos)
  (plist-get (notmuch-search-get-result pos) :tags))

(defun notmuch-search-get-tags-region (beg end)
  (let (output)
    (notmuch-search-foreach-result beg end
      (lambda (pos)
	(setq output (append output (notmuch-search-get-tags pos)))))
    output))

(defun notmuch-search-tag-region (beg end &optional tag-changes)
  "Change tags for threads in the given region."
  (let ((search-string (notmuch-search-find-thread-id-region-search beg end)))
    (setq tag-changes (funcall 'notmuch-tag search-string tag-changes))
    (notmuch-search-foreach-result beg end
      (lambda (pos)
	(notmuch-search-set-tags
	 (notmuch-update-tags (notmuch-search-get-tags pos) tag-changes)
	 pos)))))

(defun notmuch-search-tag (&optional tag-changes)
  "Change tags for the currently selected thread or region.

See `notmuch-tag' for information on the format of TAG-CHANGES."
  (interactive)
  (let* ((beg (if (region-active-p) (region-beginning) (point)))
	 (end (if (region-active-p) (region-end) (point))))
    (funcall 'notmuch-search-tag-region beg end tag-changes)))

(defun notmuch-search-add-tag ()
  "Same as `notmuch-search-tag' but sets initial input to '+'."
  (interactive)
  (notmuch-search-tag "+"))

(defun notmuch-search-remove-tag ()
  "Same as `notmuch-search-tag' but sets initial input to '-'."
  (interactive)
  (notmuch-search-tag "-"))

(defun notmuch-search-archive-thread (&optional unarchive)
  "Archive the currently selected thread.

Archive each message in the currently selected thread by applying
the tag changes in `notmuch-archive-tags' to each (remove the
\"inbox\" tag by default). If a prefix argument is given, the
messages will be \"unarchived\" (i.e. the tag changes in
`notmuch-archive-tags' will be reversed).

This function advances the next thread when finished."
  (interactive "P")
  (when notmuch-archive-tags
    (notmuch-search-tag
     (notmuch-tag-change-list notmuch-archive-tags unarchive)))
  (notmuch-search-next-thread))

(defun notmuch-search-update-result (result &optional pos)
  "Replace the result object of the thread at POS (or point) by
RESULT and redraw it.

This will keep point in a reasonable location.  However, if there
are enclosing save-excursions and the saved point is in the
result being updated, the point will be restored to the beginning
of the result."
  (let ((start (notmuch-search-result-beginning pos))
	(end (notmuch-search-result-end pos))
	(init-point (point))
	(inhibit-read-only t))
    ;; Delete the current thread
    (delete-region start end)
    ;; Insert the updated thread
    (notmuch-search-show-result result start)
    ;; If point was inside the old result, make an educated guess
    ;; about where to place it now.  Unfortunately, this won't work
    ;; with save-excursion (or any other markers that would be nice to
    ;; preserve, such as the window start), but there's nothing we can
    ;; do about that without a way to retrieve markers in a region.
    (when (and (>= init-point start) (<= init-point end))
      (let* ((new-end (notmuch-search-result-end start))
	     (new-point (if (= init-point end)
			    new-end
			  (min init-point (- new-end 1)))))
	(goto-char new-point)))))

(defun notmuch-search-process-sentinel (proc msg)
  "Add a message to let user know when \"notmuch search\" exits"
  (let ((buffer (process-buffer proc))
	(status (process-status proc))
	(exit-status (process-exit-status proc))
	(never-found-target-thread nil))
    (when (memq status '(exit signal))
      (catch 'return
	(kill-buffer (process-get proc 'parse-buf))
	(if (buffer-live-p buffer)
	    (with-current-buffer buffer
	      (save-excursion
		(let ((inhibit-read-only t)
		      (atbob (bobp)))
		  (goto-char (point-max))
		  (if (eq status 'signal)
		      (insert "Incomplete search results (search process was killed).\n"))
		  (when (eq status 'exit)
		    (insert "End of search results.\n")
		    ;; For version mismatch, there's no point in
		    ;; showing the search buffer
		    (when (or (= exit-status 20) (= exit-status 21))
		      (kill-buffer))
		    (condition-case err
			(notmuch-check-async-exit-status proc msg)
		      ;; Suppress the error signal since strange
		      ;; things happen if a sentinel signals.  Mimic
		      ;; the top-level's handling of error messages.
		      (error
		       (message "%s" (second err))
		       (throw 'return nil)))
		    (if (and atbob
			     (not (string= notmuch-search-target-thread "found")))
			(set 'never-found-target-thread t)))))
	      (when (and never-found-target-thread
		       notmuch-search-target-line)
		  (goto-char (point-min))
		  (forward-line (1- notmuch-search-target-line)))))))))

(defcustom notmuch-search-line-faces '(("unread" :weight bold)
				       ("flagged" :foreground "blue"))
  "Tag/face mapping for line highlighting in notmuch-search.

Here is an example of how to color search results based on tags.
 (the following text would be placed in your ~/.emacs file):

 (setq notmuch-search-line-faces '((\"deleted\" . (:foreground \"red\"
						  :background \"blue\"))
                                   (\"unread\" . (:foreground \"green\"))))

The attributes defined for matching tags are merged, with later
attributes overriding earlier. A message having both \"deleted\"
and \"unread\" tags with the above settings would have a green
foreground and blue background."
  :type '(alist :key-type (string) :value-type (custom-face-edit))
  :group 'notmuch-search
  :group 'notmuch-faces)

(defun notmuch-search-color-line (start end line-tag-list)
  "Colorize lines in `notmuch-show' based on tags."
  (mapc (lambda (elem)
	  (let ((tag (car elem))
		(attributes (cdr elem)))
	    (when (member tag line-tag-list)
	      (notmuch-combine-face-text-property start end attributes))))
	;; Reverse the list so earlier entries take precedence
	(reverse notmuch-search-line-faces)))

(defun notmuch-search-author-propertize (authors)
  "Split `authors' into matching and non-matching authors and
propertize appropriately. If no boundary between authors and
non-authors is found, assume that all of the authors match."
  (if (string-match "\\(.*\\)|\\(.*\\)" authors)
      (concat (propertize (concat (match-string 1 authors) ",")
			  'face 'notmuch-search-matching-authors)
	      (propertize (match-string 2 authors)
			  'face 'notmuch-search-non-matching-authors))
    (propertize authors 'face 'notmuch-search-matching-authors)))

(defun notmuch-search-insert-authors (format-string authors)
  ;; Save the match data to avoid interfering with
  ;; `notmuch-search-process-filter'.
  (save-match-data
    (let* ((formatted-authors (format format-string authors))
	   (formatted-sample (format format-string ""))
	   (visible-string formatted-authors)
	   (invisible-string "")
	   (padding ""))

      ;; Truncate the author string to fit the specification.
      (if (> (length formatted-authors)
	     (length formatted-sample))
	  (let ((visible-length (- (length formatted-sample)
				   (length "... "))))
	    ;; Truncate the visible string according to the width of
	    ;; the display string.
	    (setq visible-string (substring formatted-authors 0 visible-length)
		  invisible-string (substring formatted-authors visible-length))
	    ;; If possible, truncate the visible string at a natural
	    ;; break (comma or pipe), as incremental search doesn't
	    ;; match across the visible/invisible border.
	    (when (string-match "\\(.*\\)\\([,|] \\)\\([^,|]*\\)" visible-string)
	      ;; Second clause is destructive on `visible-string', so
	      ;; order is important.
	      (setq invisible-string (concat (match-string 3 visible-string)
					     invisible-string)
		    visible-string (concat (match-string 1 visible-string)
					   (match-string 2 visible-string))))
	    ;; `visible-string' may be shorter than the space allowed
	    ;; by `format-string'. If so we must insert some padding
	    ;; after `invisible-string'.
	    (setq padding (make-string (- (length formatted-sample)
					  (length visible-string)
					  (length "..."))
				       ? ))))

      ;; Use different faces to show matching and non-matching authors.
      (if (string-match "\\(.*\\)|\\(.*\\)" visible-string)
	  ;; The visible string contains both matching and
	  ;; non-matching authors.
	  (setq visible-string (notmuch-search-author-propertize visible-string)
		;; The invisible string must contain only non-matching
		;; authors, as the visible-string contains both.
		invisible-string (propertize invisible-string
					     'face 'notmuch-search-non-matching-authors))
	;; The visible string contains only matching authors.
	(setq visible-string (propertize visible-string
					 'face 'notmuch-search-matching-authors)
	      ;; The invisible string may contain both matching and
	      ;; non-matching authors.
	      invisible-string (notmuch-search-author-propertize invisible-string)))

      ;; If there is any invisible text, add it as a tooltip to the
      ;; visible text.
      (when (not (string= invisible-string ""))
	(setq visible-string (propertize visible-string 'help-echo (concat "..." invisible-string))))

      ;; Insert the visible and, if present, invisible author strings.
      (insert visible-string)
      (when (not (string= invisible-string ""))
	(let ((start (point))
	      overlay)
	  (insert invisible-string)
	  (setq overlay (make-overlay start (point)))
	  (overlay-put overlay 'invisible 'ellipsis)
	  (overlay-put overlay 'isearch-open-invisible #'delete-overlay)))
      (insert padding))))

(defun notmuch-search-insert-field (field format-string result)
  (cond
   ((string-equal field "date")
    (insert (propertize (format format-string (plist-get result :date_relative))
			'face 'notmuch-search-date)))
   ((string-equal field "count")
    (insert (propertize (format format-string
				(format "[%s/%s]" (plist-get result :matched)
					(plist-get result :total)))
			'face 'notmuch-search-count)))
   ((string-equal field "subject")
    (insert (propertize (format format-string (plist-get result :subject))
			'face 'notmuch-search-subject)))

   ((string-equal field "authors")
    (notmuch-search-insert-authors format-string (plist-get result :authors)))

   ((string-equal field "tags")
    (let ((tags-str (mapconcat 'identity (plist-get result :tags) " ")))
      (insert (propertize (format format-string tags-str)
			  'face 'notmuch-tag-face))))))

(defun notmuch-search-show-result (result &optional pos)
  "Insert RESULT at POS or the end of the buffer if POS is null."
  ;; Ignore excluded matches
  (unless (= (plist-get result :matched) 0)
    (let ((beg (or pos (point-max))))
      (save-excursion
	(goto-char beg)
	(dolist (spec notmuch-search-result-format)
	  (notmuch-search-insert-field (car spec) (cdr spec) result))
	(insert "\n")
	(notmuch-search-color-line beg (point) (plist-get result :tags))
	(put-text-property beg (point) 'notmuch-search-result result))
      (when (string= (plist-get result :thread) notmuch-search-target-thread)
	(setq notmuch-search-target-thread "found")
	(goto-char beg)))))

(defun notmuch-search-show-error (string &rest objects)
  (save-excursion
    (goto-char (point-max))
    (insert "Error: Unexpected output from notmuch search:\n")
    (insert (apply #'format string objects))
    (insert "\n")))

(defun notmuch-search-process-filter (proc string)
  "Process and filter the output of \"notmuch search\""
  (let ((results-buf (process-buffer proc))
	(parse-buf (process-get proc 'parse-buf))
	(inhibit-read-only t)
	done)
    (if (not (buffer-live-p results-buf))
	(delete-process proc)
      (with-current-buffer parse-buf
	;; Insert new data
	(save-excursion
	  (goto-char (point-max))
	  (insert string))
	(notmuch-json-parse-partial-list 'notmuch-search-show-result
					 'notmuch-search-show-error
					 results-buf)))))

(defun notmuch-search-tag-all (&optional tag-changes)
  "Add/remove tags from all messages in current search buffer.

See `notmuch-tag' for information on the format of TAG-CHANGES."
  (interactive)
  (apply 'notmuch-tag notmuch-search-query-string tag-changes))

(defun notmuch-search-buffer-title (query)
  "Returns the title for a buffer with notmuch search results."
  (let* ((saved-search
	  (let (longest
		(longest-length 0))
	    (loop for tuple in notmuch-saved-searches
		  if (let ((quoted-query (regexp-quote (cdr tuple))))
		       (and (string-match (concat "^" quoted-query) query)
			    (> (length (match-string 0 query))
			       longest-length)))
		  do (setq longest tuple))
	    longest))
	 (saved-search-name (car saved-search))
	 (saved-search-query (cdr saved-search)))
    (cond ((and saved-search (equal saved-search-query query))
	   ;; Query is the same as saved search (ignoring case)
	   (concat "*notmuch-saved-search-" saved-search-name "*"))
	  (saved-search
	   (concat "*notmuch-search-"
		   (replace-regexp-in-string (concat "^" (regexp-quote saved-search-query))
					     (concat "[ " saved-search-name " ]")
					     query)
		   "*"))
	  (t
	   (concat "*notmuch-search-" query "*"))
	  )))

(defun notmuch-read-query (prompt)
  "Read a notmuch-query from the minibuffer with completion.

PROMPT is the string to prompt with."
  (lexical-let
      ((completions
	(append (list "folder:" "thread:" "id:" "date:" "from:" "to:"
		      "subject:" "attachment:")
		(mapcar (lambda (tag)
			  (concat "tag:" (notmuch-escape-boolean-term tag)))
			(process-lines notmuch-command "search" "--output=tags" "*")))))
    (let ((keymap (copy-keymap minibuffer-local-map))
	  (minibuffer-completion-table
	   (completion-table-dynamic
	    (lambda (string)
	      ;; generate a list of possible completions for the current input
	      (cond
	       ;; this ugly regexp is used to get the last word of the input
	       ;; possibly preceded by a '('
	       ((string-match "\\(^\\|.* (?\\)\\([^ ]*\\)$" string)
		(mapcar (lambda (compl)
			  (concat (match-string-no-properties 1 string) compl))
			(all-completions (match-string-no-properties 2 string)
					 completions)))
	       (t (list string)))))))
      ;; this was simpler than convincing completing-read to accept spaces:
      (define-key keymap (kbd "TAB") 'minibuffer-complete)
      (let ((history-delete-duplicates t))
	(read-from-minibuffer prompt nil keymap nil
			      'notmuch-search-history nil nil)))))

;;;###autoload
(defun notmuch-search (&optional query oldest-first target-thread target-line continuation)
  "Run \"notmuch search\" with the given `query' and display results.

If `query' is nil, it is read interactively from the minibuffer.
Other optional parameters are used as follows:

  oldest-first: A Boolean controlling the sort order of returned threads
  target-thread: A thread ID (without the thread: prefix) that will be made
                 current if it appears in the search results.
  target-line: The line number to move to if the target thread does not
               appear in the search results."
  (interactive)
  (if (null query)
      (setq query (notmuch-read-query "Notmuch search: ")))
  (let ((buffer (get-buffer-create (notmuch-search-buffer-title query))))
    (switch-to-buffer buffer)
    (notmuch-search-mode)
    ;; Don't track undo information for this buffer
    (set 'buffer-undo-list t)
    (set 'notmuch-search-query-string query)
    (set 'notmuch-search-oldest-first oldest-first)
    (set 'notmuch-search-target-thread target-thread)
    (set 'notmuch-search-target-line target-line)
    (set 'notmuch-search-continuation continuation)
    (let ((proc (get-buffer-process (current-buffer)))
	  (inhibit-read-only t))
      (if proc
	  (error "notmuch search process already running for query `%s'" query)
	)
      (erase-buffer)
      (goto-char (point-min))
      (save-excursion
	(let ((proc (start-process
		     "notmuch-search" buffer
		     notmuch-command "search"
		     "--format=json" "--format-version=1"
		     (if oldest-first
			 "--sort=oldest-first"
		       "--sort=newest-first")
		     query))
	      ;; Use a scratch buffer to accumulate partial output.
	      ;; This buffer will be killed by the sentinel, which
	      ;; should be called no matter how the process dies.
	      (parse-buf (generate-new-buffer " *notmuch search parse*")))
	  (process-put proc 'parse-buf parse-buf)
	  (set-process-sentinel proc 'notmuch-search-process-sentinel)
	  (set-process-filter proc 'notmuch-search-process-filter)
	  (set-process-query-on-exit-flag proc nil))))
    (run-hooks 'notmuch-search-hook)))

(defun notmuch-search-refresh-view ()
  "Refresh the current view.

Kills the current buffer and runs a new search with the same
query string as the current search. If the current thread is in
the new search results, then point will be placed on the same
thread. Otherwise, point will be moved to attempt to be in the
same relative position within the new buffer."
  (interactive)
  (let ((target-line (line-number-at-pos))
	(oldest-first notmuch-search-oldest-first)
	(target-thread (notmuch-search-find-thread-id 'bare))
	(query notmuch-search-query-string)
	(continuation notmuch-search-continuation))
    (notmuch-kill-this-buffer)
    (notmuch-search query oldest-first target-thread target-line continuation)
    (goto-char (point-min))))

(defcustom notmuch-poll-script nil
  "An external script to incorporate new mail into the notmuch database.

This variable controls the action invoked by
`notmuch-search-poll-and-refresh-view' and
`notmuch-hello-poll-and-update' (each have a default keybinding
of 'G') to incorporate new mail into the notmuch database.

If set to nil (the default), new mail is processed by invoking
\"notmuch new\". Otherwise, this should be set to a string that
gives the name of an external script that processes new mail. If
set to the empty string, no command will be run.

The external script could do any of the following depending on
the user's needs:

1. Invoke a program to transfer mail to the local mail store
2. Invoke \"notmuch new\" to incorporate the new mail
3. Invoke one or more \"notmuch tag\" commands to classify the mail

Note that the recommended way of achieving the same is using
\"notmuch new\" hooks."
  :type '(choice (const :tag "notmuch new" nil)
		 (const :tag "Disabled" "")
		 (string :tag "Custom script"))
  :group 'notmuch-external)

(defun notmuch-poll ()
  "Run \"notmuch new\" or an external script to import mail.

Invokes `notmuch-poll-script', \"notmuch new\", or does nothing
depending on the value of `notmuch-poll-script'."
  (interactive)
  (if (stringp notmuch-poll-script)
      (unless (string= notmuch-poll-script "")
	(call-process notmuch-poll-script nil nil))
    (call-process notmuch-command nil nil nil "new")))

(defun notmuch-search-poll-and-refresh-view ()
  "Invoke `notmuch-poll' to import mail, then refresh the current view."
  (interactive)
  (notmuch-poll)
  (notmuch-search-refresh-view))

(defun notmuch-search-toggle-order ()
  "Toggle the current search order.

By default, the \"inbox\" view created by `notmuch' is displayed
in chronological order (oldest thread at the beginning of the
buffer), while any global searches created by `notmuch-search'
are displayed in reverse-chronological order (newest thread at
the beginning of the buffer).

This command toggles the sort order for the current search.

Note that any filtered searches created by
`notmuch-search-filter' retain the search order of the parent
search."
  (interactive)
  (set 'notmuch-search-oldest-first (not notmuch-search-oldest-first))
  (notmuch-search-refresh-view))

(defun notmuch-search-filter (query)
  "Filter the current search results based on an additional query string.

Runs a new search matching only messages that match both the
current search results AND the additional query string provided."
  (interactive (list (notmuch-read-query "Filter search: ")))
  (let ((grouped-query (if (string-match-p notmuch-search-disjunctive-regexp query)
			   (concat "( " query " )")
			 query)))
    (notmuch-search (if (string= notmuch-search-query-string "*")
			grouped-query
		      (concat notmuch-search-query-string " and " grouped-query)) notmuch-search-oldest-first)))

(defun notmuch-search-filter-by-tag (tag)
  "Filter the current search results based on a single tag.

Runs a new search matching only messages that match both the
current search results AND that are tagged with the given tag."
  (interactive
   (list (notmuch-select-tag-with-completion "Filter by tag: ")))
  (notmuch-search (concat notmuch-search-query-string " and tag:" tag) notmuch-search-oldest-first))

;;;###autoload
(defun notmuch ()
  "Run notmuch and display saved searches, known tags, etc."
  (interactive)
  (notmuch-hello))

(defun notmuch-interesting-buffer (b)
  "Is the current buffer of interest to a notmuch user?"
  (with-current-buffer b
    (memq major-mode '(notmuch-show-mode
		       notmuch-search-mode
		       notmuch-hello-mode
		       message-mode))))

;;;###autoload
(defun notmuch-cycle-notmuch-buffers ()
  "Cycle through any existing notmuch buffers (search, show or hello).

If the current buffer is the only notmuch buffer, bury it. If no
notmuch buffers exist, run `notmuch'."
  (interactive)

  (let (start first)
    ;; If the current buffer is a notmuch buffer, remember it and then
    ;; bury it.
    (when (notmuch-interesting-buffer (current-buffer))
      (setq start (current-buffer))
      (bury-buffer))

    ;; Find the first notmuch buffer.
    (setq first (loop for buffer in (buffer-list)
		     if (notmuch-interesting-buffer buffer)
		     return buffer))

    (if first
	;; If the first one we found is any other than the starting
	;; buffer, switch to it.
	(unless (eq first start)
	  (switch-to-buffer first))
      (notmuch))))

(setq mail-user-agent 'notmuch-user-agent)

(provide 'notmuch)

debug log:

solving c98a4fe ...
found c98a4fe in https://yhetil.org/notmuch.git/

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

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