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+;;; piem-debbugs.el --- Debbugs integration for piem  -*- lexical-binding: t; -*-
+
+;; Copyright all piem contributors <piem@inbox.kyleam.com>
+
+;; Author: Jelle Licht <jlicht@fsfe.org>
+;; Keywords: vc, tools
+;; Package-Requires: ((emacs "26.3")(debbugs "0.29"))
+
+;; 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/>.
+
+;;; Commentary:
+
+;; This library provides a minor mode, `piem-debbugs-mode', that modifies
+;; `piem' variables to teach functions like `piem-inbox' how to
+;; extract information from Debbugs buffers.
+
+;;; Code:
+
+(require 'debbugs-gnu)
+(require 'piem)
+
+(defgroup piem-debbugs nil
+  "Debbugs integration for piem."
+  :group 'piem)
+
+(defun piem-debbugs-get-inbox ()
+  "Return inbox name from a Debbugs buffer."
+  (when (and (derived-mode-p 'debbugs-gnu-mode)
+             (boundp 'debbugs-gnu-local-query))
+    (when-let ((gnu-package (alist-get 'package debbugs-gnu-local-query)))
+      (piem-inbox-by-gnu-package-match gnu-package))))
+
+(defun piem-debbugs-get-mid ()
+  "Return the message ID of a Debbugs buffer."
+  (when (derived-mode-p 'debbugs-gnu-mode)
+    (let ((msgid (alist-get 'msgid (debbugs-gnu-current-status))))
+      (when (stringp msgid)
+        (string-trim msgid "<" ">")))))
+
+;;;###autoload
+(define-minor-mode piem-debbugs-mode
+  "Toggle Debbugs support for piem.
+With a prefix argument ARG, enable piem-debbugs mode if ARG is
+positive, and disable it otherwise.  If called from Lisp, enable
+the mode if ARG is omitted or nil."
+  :global t
+  :init-value nil
+  (if piem-debbugs-mode
+      (progn
+        (add-hook 'piem-get-inbox-functions #'piem-debbugs-get-inbox)
+        (add-hook 'piem-get-mid-functions #'piem-debbugs-get-mid))
+    (remove-hook 'piem-get-inbox-functions #'piem-debbugs-get-inbox)
+    (remove-hook 'piem-get-mid-functions #'piem-debbugs-get-mid)))
+
+;;; piem-debbugs.el ends here
+(provide 'piem-debbugs)