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;;; rmailkwd.el --- part of the "RMAIL" mail reader for Emacs -*- lexical-binding: t; -*-
;; Copyright (C) 1985, 1988, 1994, 2001-2025 Free Software Foundation,
;; Inc.
;; Maintainer: emacs-devel@gnu.org
;; Keywords: mail
;; Package: rmail
;; This file is 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'rmail)
;; Global to all RMAIL buffers. It exists for the sake of completion.
;; It is better to use strings with the label functions and let them
;; worry about making the label.
(defvar rmail-label-obarray (obarray-make 47)
"Obarray of labels used by Rmail.
`rmail-read-label' uses this to offer completion.")
;; Initialize with the standard labels.
(mapc (lambda (s) (intern (cadr s) rmail-label-obarray))
rmail-attr-array)
(defun rmail-make-label (s)
"Intern string S as a downcased symbol in `rmail-label-obarray'."
(intern (downcase s) rmail-label-obarray))
;;;###autoload
(defun rmail-add-label (label)
"Add LABEL to labels associated with current RMAIL message.
Completes (see `rmail-read-label') over known labels when reading.
LABEL may be a symbol or string. Only one label is allowed."
(interactive (list (rmail-read-label "Add label")))
(rmail-set-label label t))
;;;###autoload
(defun rmail-kill-label (label)
"Remove LABEL from labels associated with current RMAIL message.
Completes (see `rmail-read-label') over known labels when reading.
LABEL may be a symbol or string. Only one label is allowed."
(interactive (list (rmail-read-label "Remove label")))
(rmail-set-label label nil))
;;;###autoload
(defun rmail-read-label (prompt)
"Read a label with completion, prompting with PROMPT.
Completions are chosen from `rmail-label-obarray'. The default
is `rmail-last-label', if that is non-nil. Updates `rmail-last-label'
according to the choice made, and returns a symbol."
(let* ((old nil)
(result
(progn
;; If the summary exists, we've already read all the
;; existing labels. If not, read the ones in this message.
(or (eq major-mode 'rmail-summary-mode)
(rmail-summary-exists)
(and (setq old (rmail-get-keywords))
(mapc #'rmail-make-label (split-string old ", "))))
(completing-read (format-prompt prompt
(and rmail-last-label
(symbol-name rmail-last-label)))
rmail-label-obarray
nil
nil))))
(if (string= result "")
rmail-last-label
(setq rmail-last-label (rmail-make-label result)))))
(declare-function rmail-summary-update-line "rmailsum" (n))
(defun rmail-set-label (label state &optional msg)
"Set LABEL as present or absent according to STATE in message MSG.
LABEL may be a symbol or string."
(or (stringp label) (setq label (symbol-name label)))
(if (string-search "," label)
(error "More than one label specified"))
(with-current-buffer rmail-buffer
(rmail-maybe-set-message-counters)
(if (zerop (or msg (setq msg rmail-current-message)))
(error "No message"))
;; Force recalculation of summary for this message.
(aset rmail-summary-vector (1- msg) nil)
(let (attr-index)
;; Is this label an attribute?
(dotimes (i (length rmail-attr-array))
(if (string= (cadr (aref rmail-attr-array i)) label)
(setq attr-index i)))
(if attr-index
;; If so, set it as an attribute.
(rmail-set-attribute attr-index state msg)
;; Is this keyword already present in msg's keyword list?
(let* ((header (rmail-get-keywords msg))
(regexp (concat ", " (regexp-quote label) ","))
(present (not (null
(string-match regexp (concat ", " header ","))))))
;; If current state is not correct,
(unless (eq present state)
;; either add it or delete it.
(rmail-set-header
rmail-keyword-header msg
(if state
;; Add this keyword at the end.
(if (and header (not (string= header "")))
(concat header ", " label)
label)
;; Delete this keyword.
(let ((before (substring header 0
(max 0 (- (match-beginning 0) 2))))
(after (substring header
(min (length header)
(- (match-end 0) 1)))))
(cond ((string= before "")
;; If before and after both empty, delete the header.
(unless (string= after "")
after))
((string= after "")
before)
(t (concat before ", " after))))))))))
(if (rmail-summary-exists)
(rmail-select-summary (rmail-summary-update-line msg)))
(if (= msg rmail-current-message)
(rmail-display-labels))))
;; Motion on messages with keywords.
;;;###autoload
(defun rmail-previous-labeled-message (n labels)
"Show previous message with one of the labels LABELS.
LABELS should be a comma-separated list of label names.
If LABELS is empty, the last set of labels specified is used.
With prefix argument N moves backward N messages with these labels."
(interactive "p\nsMove to previous msg with labels: ")
(rmail-next-labeled-message (- n) labels))
(declare-function mail-comma-list-regexp "mail-utils" (labels))
;;;###autoload
(defun rmail-next-labeled-message (n labels)
"Show next message with one of the labels LABELS.
LABELS should be a comma-separated list of label names.
If LABELS is empty, the last set of labels specified is used.
With prefix argument N moves forward N messages with these labels."
;; FIXME show the default in the prompt.
(interactive "p\nsMove to next msg with labels: ")
(if (string= labels "")
(setq labels rmail-last-multi-labels))
(or labels
(error "No labels to find have been specified previously"))
(set-buffer rmail-buffer)
(setq rmail-last-multi-labels labels)
(rmail-maybe-set-message-counters)
(let ((lastwin rmail-current-message)
(current rmail-current-message)
(regexp (concat " \\("
(mail-comma-list-regexp labels)
"\\)\\(,\\|\\'\\)")))
(while (and (> n 0) (< current rmail-total-messages))
(setq current (1+ current))
(if (string-match regexp (rmail-get-labels current))
(setq lastwin current n (1- n))))
(while (and (< n 0) (> current 1))
(setq current (1- current))
(if (string-match regexp (rmail-get-labels current))
(setq lastwin current n (1+ n))))
(if (< n 0)
(error "No previous message with labels %s" labels)
(if (> n 0)
(error "No following message with labels %s" labels)
(rmail-show-message-1 lastwin)))))
(provide 'rmailkwd)
;;; rmailkwd.el ends here
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