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;;; jao-r2e.el --- List of rss2email subscriptions -*- lexical-binding: t; -*-
;; Copyright (C) 2025 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <mail@jao.io>
;; Keywords: news
;; This program 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.
;; This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
(require 'jao-url)
(autoload 'View-quit "view")
(autoload 'eww-view-source "eww")
(autoload 'jao-notmuch-subtags "jao-notmuch")
(defvar jao-r2e-confirm-toggle nil)
(defconst jao-r2e--buffer "*r2e*")
(defun jao-r2e--buffer ()
(with-current-buffer (get-buffer-create jao-r2e--buffer)
(unless (derived-mode-p 'jao-r2e-mode)
(jao-r2e-mode))
(current-buffer)))
(defvar jao-r2e-mode-map
(let ((map (make-keymap)))
(suppress-keymap map)
(define-key map [?q] 'bury-buffer)
(define-key map [?n] 'next-line)
(define-key map [?p] 'previous-line)
(define-key map [?N] 'jao-r2e-next)
(define-key map [?P] 'jao-r2e-prev)
(define-key map [?g] 'jao-r2e-list)
(define-key map [?s] 'jao-r2e-subscribe)
(define-key map [?t] 'jao-r2e-toggle)
(define-key map [?D] 'jao-r2e-delete)
(define-key map [?u] 'jao-r2e-recover)
map))
;;;###autoload
(defun jao-r2e-mode ()
"A very simple mode to show the output of r2e commands."
(interactive)
(kill-all-local-variables)
(buffer-disable-undo)
(use-local-map jao-r2e-mode-map)
;; (setq-local font-lock-defaults '(jao-r2e-font-lock-keywords))
(setq-local truncate-lines t)
(setq-local next-line-add-newlines nil)
(setq major-mode 'jao-r2e-mode)
(setq mode-name "r2e")
(read-only-mode 1))
(defun jao-r2e--do (things &optional buffer)
"Execute a r2e command THINGS in the given BUFFER."
(let ((b (or buffer (pop-to-buffer (jao-r2e--buffer)))))
(let ((inhibit-read-only t)
(cmd (format "r2e %s" things)))
(unless buffer
(with-current-buffer b (delete-region (point-min) (point-max))))
(with-temp-message (format "Running: %s ...." cmd)
(shell-command cmd b))
(unless buffer (read-only-mode 1)))))
(defconst jao-r2e--feed-rx
"^\\([0-9]+\\): \\[\\( \\|\\*\\)\\] \\([^ ]+\\) (\\(.+\\) -> \\(.+\\))")
(defun jao-r2e--feed-at-point ()
(beginning-of-line)
(when-let* ((m (looking-at jao-r2e--feed-rx)))
(list (match-string 1)
(match-string 3)
(string= "*" (match-string 2))
(match-string 4)
(match-string 5))))
(defun jao-r2e ()
(interactive)
(pop-to-buffer (jao-r2e--buffer))
(when (looking-at-p "^$")
(jao-r2e-list)))
(defun jao-r2e-list ()
(interactive)
(jao-r2e--do "list"))
(defun jao-r2e--srx (opp)
(when-let* ((f (jao-r2e--feed-at-point)))
(let ((a (if opp (not (caddr f)) (caddr f))))
(format "^[0-9]+: \\[%s\\] " (if a "\\*" " ")))))
(defun jao-r2e-next (opp)
"Next feed with the same (or opposite) status."
(interactive "P")
(when-let* ((rx (jao-r2e--srx opp)))
(next-line)
(when (re-search-forward rx nil t)
(beginning-of-line))))
(defun jao-r2e-prev (opp)
"Previous feed with the same (or opposite) status."
(interactive "P")
(when-let* ((rx (jao-r2e--srx opp)))
(when (re-search-backward rx nil t)
(beginning-of-line))))
(defun jao-r2e-toggle ()
(interactive)
(let ((f (jao-r2e--feed-at-point)))
(unless f (error "No feed at point"))
(let ((p (point))
(no (car f))
(name (cadr f))
(act (if (caddr f) "pause" "unpause")))
(when (or (not jao-r2e-confirm-toggle)
(yes-or-no-p (format "%s '%s'? " act name)))
(with-temp-buffer
(jao-r2e--do (format "%s %s" act no) (current-buffer)))
(jao-r2e-list)
(goto-char p)))))
(persist-defvar jao-r2e-deleted-feeds '()
"List of rss2email feeds deleted at some point.")
(defun jao-r2e-delete ()
"Delete feed at point. Use `jao-r2e-recover' to undelete."
(interactive)
(let ((f (jao-r2e--feed-at-point)))
(unless f (error "No feed at point"))
(let ((p (point))
(no (car f))
(name (cadr f)))
(when (yes-or-no-p (format "Delete feed '%s'" name))
(add-to-list 'jao-r2e-deleted-feeds (cdr f))
(with-temp-buffer
(jao-r2e--do (format "delete %s" no) (current-buffer)))
(jao-r2e-list)
(goto-char p)))))
(defun jao-r2e-recover ()
(interactive)
(when (seq-empty-p jao-r2e-deleted-feeds)
(error "No feeds recoverable at this point."))
(let ((feed (completing-read "Recover feed: " jao-r2e-deleted-feeds)))
(when-let* ((ps (assoc feed jao-r2e-deleted-feeds))
(url (caddr ps))
(mail (car (last ps)))
(cat (when (string-match "feeds\\.\\(.+\\)@localhost" mail)
(match-string 1 mail))))
(jao-r2e-subscribe (list url feed) cat t)
(setq jao-r2e-deleted-feeds (remove ps jao-r2e-deleted-feeds)))))
(defun jao-r2e--find-url ()
(save-excursion
(when (derived-mode-p 'w3m-mode 'eww-mode)
(if (fboundp 'w3m-view-source) (w3m-view-source) (eww-view-source)))
(goto-char (point-min))
(when (re-search-forward
"type=\"application/\\(?:atom\\|rss\\)\\+xml\" +" nil t)
(let ((url (save-excursion
(when (re-search-forward
"href=\"\\([^\n\"]+\\)\"" nil t)
(match-string-no-properties 1))))
(title (when (re-search-forward
"\\(?:title=\"\\([^\n\"]+\\)\" +\\)" nil t)
(match-string-no-properties 1))))
(cond ((derived-mode-p 'w3m-view-mode) (w3m-view-source))
((string-match-p ".*\\*eww-source\\b.*" (buffer-name))
(View-quit)))
(when url (cons url (or title "")))))))
(defun jao-r2e-subscribe (url &optional cat relist)
"Subscribe to a given RSS URL. If URL not given, look for it."
(interactive (list (or (jao-url-around-point)
(jao-r2e--find-url)
(read-string "Feed URL: "))))
(let* ((url+title (ensure-list url))
(url (car url+title))
(title (cdr url+title)))
(unless url (error "No feeds found"))
(let ((url (if (string-match "^feed:" url) (substring url 5) url)))
(when (y-or-n-p (format "Subscribe to <%s>? " url))
(let* ((name (read-string "Feed name: " title))
(cats (cons "prog" (jao-notmuch-subtags "feeds")))
(cat (completing-read "Category: " cats nil t cat))
(subs (format "r2e add %s '%s' feeds.%s@localhost"
name url cat)))
(with-temp-message "Subscribing..."
(shell-command-to-string subs))
(with-temp-message "Retrieving feed..."
(shell-command (format "r2e run %s" name)))
(when relist (jao-r2e-list)))))))
(provide 'jao-r2e)
;;; jao-r2e.el ends here
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