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;; jao-maildir.el -- Utilities for reading maildirs -*- lexical-binding: t; -*-
;; Copyright (c) 2019, 2020, 2021 jao
;; Author: jao <mail@jao.io>
;; Start date: Sun Dec 01, 2019 15:48
;; Keywords: mail
;; This file 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, or (at your option)
;; any later version.
;; This file 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; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Comentary:
;; Inspecting the contents of maildirs and reporting it.
;;; Code:
(require 'seq)
(require 'jao-minibuffer)
(defvar jao-maildir-debug-p nil)
(defvar jao-maildir-echo-p t)
(defvar jao-maildir-tracked-maildirs nil)
(defvar jao-maildir-info-string "")
(defgroup jao-maildir-faces nil "Faces"
:group 'faces)
(defun jao-maildir--maildir-new (mbox) (expand-file-name "new" mbox))
(defun jao-maildir--maildir-new-count (mbox)
(- (length (directory-files (jao-maildir--maildir-new mbox))) 2))
(defface jao-maildir-emph '((t :inherit font-lock-keyword-face))
"Face used to highlihgt non-boring tracked maildirs"
:group 'jao-maildir-faces)
(defvar jao-maildir--maildirs nil)
(defvar jao-maildir--counts nil)
(defvar jao-maildir--label-mboxes nil)
(defvar jao-maildir--trackers nil)
(defvar jao-maildir--track-strings ())
(defun jao-maildir--update-counts ()
(dolist (mbox jao-maildir--maildirs)
(puthash mbox (jao-maildir--maildir-new-count mbox) jao-maildir--counts)))
(defun jao-maildir--init-counts (maildirs)
(setq jao-maildir--counts (make-hash-table :test 'equal))
(setq jao-maildir--maildirs maildirs)
(jao-maildir--update-counts))
(defun jao-maildir--set-trackers (maildirs tracked-maildirs)
(jao-maildir--init-counts maildirs)
(let* ((label-mboxes (make-hash-table :test 'equal))
(trackers (seq-map-indexed
(lambda (track idx)
(puthash (car track) () label-mboxes)
(let ((tr (seq-take track 2))
(l (elt track 2)))
(append tr
(cond ((eq l t) '(jao-maildir-emph))
((null l) '(default))
(t (list l)))
(list (or (elt track 3) idx)))))
tracked-maildirs)))
(dolist (mbox maildirs)
(let ((lb (seq-find (lambda (lb) (when lb (string-match-p lb mbox)))
(hash-table-keys label-mboxes))))
(puthash lb (cons mbox (gethash lb label-mboxes)) label-mboxes)))
(setq jao-maildir--label-mboxes label-mboxes)
(setq jao-maildir--trackers trackers)))
(defun jao-maildir--tracked-count (track)
(seq-reduce (lambda (c k) (+ c (gethash k jao-maildir--counts 0)))
(gethash (car track) jao-maildir--label-mboxes)
0))
(defun jao-maildir--update-track-string (mbox)
(when-let ((track (seq-find (lambda (td) (string-match-p (car td) mbox))
jao-maildir--trackers)))
(let* ((label (cadr track))
(other (assoc-delete-all label jao-maildir--track-strings))
(cnt (jao-maildir--tracked-count track)))
(if (> cnt 0)
(let* ((face (car (last (butlast track))))
(order (car (last track)))
(str (propertize (format "%s%s" label cnt) 'face face))
(str (cons label (cons order str))))
(setq jao-maildir--track-strings (cons str other)))
(setq jao-maildir--track-strings other)))))
;;;###autoload
(defun jao-maildir-update-info-string (&optional mbox)
(cond ((eq mbox t)
(seq-do 'jao-maildir--update-track-string jao-maildir--maildirs))
((stringp mbox)
(puthash mbox (jao-maildir--maildir-new-count mbox) jao-maildir--counts)
(jao-maildir--update-track-string mbox)))
(let* ((s (seq-sort-by #'cadr #'< jao-maildir--track-strings))
(s (mapconcat 'identity (mapcar 'cddr s) " ")))
(setq jao-maildir-info-string (if (string-blank-p s) "" (concat s " "))))
(when jao-maildir-echo-p (jao-minibuffer-refresh)))
(defvar jao-maildir--watches nil)
(defun jao-maildir-cancel-watchers ()
(dolist (w jao-maildir--watches) (file-notify-rm-watch w))
(setq jao-maildir--watches nil))
(defun jao-maildir--log-watch (mbox e)
(when jao-maildir-debug-p
(message "[%s] watch: %s: %s" (current-time-string) mbox e)))
(defun jao-maildir--watcher (mbox cb)
(lambda (e)
(jao-maildir--log-watch e mbox)
(when (memq (cadr e) '(created deleted))
(jao-maildir-update-info-string mbox)
(when cb (funcall cb mbox)))))
(defun jao-maildir--setup-watches (cb)
(jao-maildir-cancel-watchers)
(setq jao-maildir--watches
(mapcar (lambda (mbox)
(file-notify-add-watch (jao-maildir--maildir-new mbox)
'(change attribute-change)
(jao-maildir--watcher mbox cb)))
jao-maildir--maildirs)))
;;;###autoload
(defun jao-maildir-setup (maildirs trackers mode-line &optional cb)
(jao-maildir--set-trackers maildirs trackers)
(cond ((eq 'mode-line mode-line)
(add-to-list 'global-mode-string 'jao-maildir-info-string t))
((numberp mode-line)
(jao-minibuffer-add-variable 'jao-maildir-info-string mode-line)
(jao-maildir-update-info-string t))
(t (error "Invalid mode-line value")))
(jao-maildir--setup-watches cb))
(provide 'jao-maildir)
;;; jao-maildir.el ends here
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