[gnu-emacs-elpa] / packages / debbugs / debbugs-gnu.el

;;; debbugs-gnu.el --- interface for the GNU bug tracker

;; Copyright (C) 2011-2015 Free Software Foundation, Inc.

;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;;         Michael Albinus <michael.albinus@gmx.org>
;; Keywords: comm, hypermedia, maint
;; Package: debbugs
;; Package-Requires: ((async))
;; Version: 0.8

;; This file is not part of GNU Emacs.

;; 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; This package provides an interface to bug reports which are located
;; on the GNU bug tracker debbugs.gnu.org.  Its main purpose is to
;; show and manipulate bug reports from Emacs, but it could be used
;; also for other GNU projects which use the same bug tracker.

;; If you have `debbugs-gnu.el' in your load-path, you could enable
;; the bug tracker commands by the following lines in your ~/.emacs
;;
;;   (autoload 'debbugs-gnu "debbugs-gnu" "" 'interactive)
;;   (autoload 'debbugs-gnu-search "debbugs-gnu" "" 'interactive)
;;   (autoload 'debbugs-gnu-usertags "debbugs-gnu" "" 'interactive)
;;   (autoload 'debbugs-gnu-bugs "debbugs-gnu" "" 'interactive)

;; The bug tracker is called interactively by
;;
;;   M-x debbugs-gnu

;; It asks for the severities, for which bugs shall be shown. This can
;; be either just one severity, or a list of severities, separated by
;; comma.  Valid severities are "serious", "important", "normal",
;; "minor" or "wishlist".  Severities "critical" and "grave" are not
;; used, although configured on the GNU bug tracker.  If no severity
;; is given, all bugs are selected.

;; There is also the pseudo severity "tagged".  When it is used, the
;; function will ask for user tags (a comma separated list), and shows
;; just the bugs which are tagged with them.  In general, user tags
;; shall be strings denoting to subprojects of the package, like
;; "cedet" or "tramp" of the package "emacs".  If no user tag is
;; given, locally tagged bugs are shown.

;; If a prefix is given to the command, more search parameters are
;; asked for, like packages (also a comma separated list, "emacs" is
;; the default), whether archived bugs shall be shown, and whether
;; closed bugs shall be shown.

;; Another command is
;;
;;   M-x debbugs-gnu-search

;; It behaves like `debbugs-gnu', but asks at the beginning for a
;; search phrase to be used for full text search.  Additionally, it
;; asks for key-value pairs to filter bugs.  Keys are as described in
;; `debbugs-get-status', the corresponding value must be a regular
;; expression to match for.  The other parameters are as described in
;; `debbugs-gnu'.  Usually, there is just one value except for the
;; attribute "date", which needs two arguments specifying a period in
;; which the bug has been submitted or modified.

;; The bug reports are downloaded from the bug tracker.  In order to
;; not generate too much load of the server, up to 500 bugs will be
;; downloaded at once.  If there are more hits, you will be asked to
;; change this limit, but please don't increase this number too much.

;; These default values could be changed also by customer options
;; `debbugs-gnu-default-severities', `debbugs-gnu-default-packages',
;; `debbugs-gnu-default-hits-per-page' and `debbugs-gnu-default-suppress-bugs'.

;; The commands create one or more pages of bug lists.  Every bug is
;; shown in one line, including the bug number, the status (combining
;; merged bug numbers, keywords and severities), the name of the
;; submitter, and the title of the bug.  On every bug line you could
;; apply the following actions by the following keystrokes:

;;   RET: Show corresponding messages in Gnus/Rmail
;;   "C": Send a control message
;;   "t": Mark the bug locally as tagged
;;   "b": Show bugs this bug is blocked by
;;   "B": Show bugs this bug is blocking
;;   "d": Show bug attributes

;; Furthermore, you could apply the global actions

;;   "g": Rescan bugs
;;   "q": Quit the buffer
;;   "s": Toggle bug sorting for age or for state
;;   "x": Toggle suppressing of bugs
;;   "/": Display only bugs matching a string
;;   "R": Display only bugs blocking the current release
;;   "w": Display all the currently selected bug reports

;; When you visit the related bug messages in Gnus, you could also
;; send control messages by keystroke "C".

;; In the header line of every bug list page, you can toggle sorting
;; per column by selecting a column with the mouse.  The sorting
;; happens as expected for the respective column; sorting in the Title
;; column is depending on whether you are the owner of a bug.

;; Another approach for listing bugs is calling the command
;;
;;   M-x debbugs-gnu-usertags

;; This command shows you all existing user tags for the packages
;; defined in `debbugs-gnu-default-packages'.  A prefix for the
;; command allows you to use other packe names, or an arbitrary string
;; for a user who has tagged bugs.  The command returns the list of
;; existing user tags for the given user(s) or package name(s),
;; respectively.  Applying RET on a user tag, all bugs tagged with
;; this user tag are shown.

;; Unfortunately, it is not possible with the SOAP interface to show
;; all users who have tagged bugs.  This list can be retrieved via
;; <http://debbugs.gnu.org/cgi/pkgindex.cgi?indexon=users>.

;; Finally, if you simply want to list some bugs with known bug
;; numbers, call the command
;;
;;   M-x debbugs-gnu-bugs

;; The bug numbers to be shown shall be entered as comma separated list.

;;; Code:

(require 'debbugs)
(require 'tabulated-list)
(require 'add-log)
(require 'subr-x)
(require 'async)
(eval-when-compile (require 'cl))

(autoload 'article-decode-charset "gnus-art")
(autoload 'diff-goto-source "diff-mode")
(autoload 'diff-hunk-file-names "diff-mode")
(autoload 'gnus-article-mime-handles "gnus-art")
(autoload 'gnus-read-ephemeral-emacs-bug-group "gnus-group")
(autoload 'gnus-summary-article-header "gnus-sum")
(autoload 'gnus-summary-select-article "gnus-sum")
(autoload 'gnus-summary-show-article "gnus-sum")
(autoload 'gnus-with-article-buffer "gnus-art")
(autoload 'log-edit-insert-changelog "log-edit")
(autoload 'mail-header-subject "nnheader")
(autoload 'message-make-from "message")
(autoload 'rmail-get-new-mail "rmail")
(autoload 'rmail-show-message "rmail")
(autoload 'rmail-summary "rmailsum")
(autoload 'vc-dir-hide-up-to-date "vc-dir")
(autoload 'vc-dir-mark "vc-dir")

(defvar compilation-in-progress)
(defvar diff-file-header-re)
(defvar gnus-article-buffer)
(defvar gnus-posting-styles)
(defvar gnus-save-duplicate-list)
(defvar gnus-suppress-duplicates)
(defvar rmail-current-message)
(defvar rmail-mode-map)
(defvar rmail-summary-mode-map)
(defvar rmail-total-messages)

(defgroup debbugs-gnu ()
  "UI for the debbugs.gnu.org bug tracker."
  :group 'debbugs
  :version "24.1")

(defvar debbugs-gnu-blocking-report 19759
  "The ID of the current release report used to track blocking bug reports.")

(defcustom debbugs-gnu-default-severities '("serious" "important" "normal")
  "*The list severities bugs are searched for.
\"tagged\" is not a severity but marks locally tagged bugs."
  ;; <http://debbugs.gnu.org/Developer.html#severities>
  :group 'debbugs-gnu
  :type '(set (const "serious")
              (const "important")
              (const "normal")
              (const "minor")
              (const "wishlist")
              (const "tagged"))
  :version "24.1")

(defconst debbugs-gnu-all-severities
  (mapcar 'cadr (cdr (get 'debbugs-gnu-default-severities 'custom-type)))
  "*List of all possible severities.")

(defcustom debbugs-gnu-default-packages '("emacs")
  "*The list of packages to be searched for."
  ;; <http://debbugs.gnu.org/Packages.html>
  ;; <http://debbugs.gnu.org/cgi/pkgindex.cgi>
  :group 'debbugs-gnu
  :type '(set (const "adns")
              (const "auctex")
              (const "automake")
              (const "cc-mode")
              (const "coreutils")
              (const "cppi")
              (const "debbugs.gnu.org")
              (const "diffutils")
              (const "emacs")
              (const "emacs-xwidgets")
              (const "fm")
              (const "gnus")
              (const "grep")
              (const "guile")
              (const "guix")
              (const "gzip")
              (const "idutils")
              (const "libtool")
              (const "mh-e")
              (const "org-mode")
              (const "parted")
              (const "sed")
              (const "vc-dwim")
              (const "woodchuck"))
  :version "25.1")

(defconst debbugs-gnu-all-packages
  (mapcar 'cadr (cdr (get 'debbugs-gnu-default-packages 'custom-type)))
  "*List of all possible package names.")

;; Please do not increase this value, otherwise we would run into
;; performance problems on the server.
(defconst debbugs-gnu-default-hits-per-page 500
  "The number of bugs shown per page.")

(defcustom debbugs-gnu-default-suppress-bugs
  '((pending . "done"))
  "*A list of specs for bugs to be suppressed.
An element of this list is a cons cell \(KEY . REGEXP\), with key
being returned by `debbugs-get-status', and VAL a regular
expression matching the corresponding value, a string.  Showing
suppressed bugs is toggled by `debbugs-gnu-toggle-suppress'."
  :group 'debbugs-gnu
  :type '(alist :key-type symbol :value-type regexp)
  :version "24.1")

(defcustom debbugs-gnu-mail-backend 'gnus
  "*The email backend to use for reading bug report email exchange.
If this is 'gnus, the default, use Gnus.
If this is 'rmail, use Rmail instead."
  :group 'debbugs-gnu
  :type '(choice (const :tag "Use Gnus" 'gnus)
                 (const :tag "Use Rmail" 'rmail))
  :version "25.1")

(defface debbugs-gnu-archived '((t (:inverse-video t)))
  "Face for archived bug reports.")

(defface debbugs-gnu-new '((t (:foreground "red")))
  "Face for new reports that nobody has answered.")

(defface debbugs-gnu-handled '((t (:foreground "ForestGreen")))
  "Face for reports that have been modified recently.")

(defface debbugs-gnu-pending '((t (:foreground "MidnightBlue")))
  "Face for reports that are pending.")

(defface debbugs-gnu-stale '((t (:foreground "orange")))
  "Face for reports that have not been touched for a week.")

(defface debbugs-gnu-done '((t (:foreground "DarkGrey")))
  "Face for closed bug reports.")

(defface debbugs-gnu-tagged '((t (:foreground "red")))
  "Face for reports that have been tagged locally.")

(defvar debbugs-gnu-local-tags nil
  "List of bug numbers tagged locally, and kept persistent.")

(defvar debbugs-gnu-persistency-file
  (expand-file-name (locate-user-emacs-file "debbugs"))
  "File name of a persistency store for debbugs variables")

(defun debbugs-gnu-dump-persistency-file ()
  "Function to store debbugs variables persistently."
  (with-temp-file debbugs-gnu-persistency-file
    (insert
     ";; -*- emacs-lisp -*-\n"
     ";; Debbugs tags connection history.  Don't change this file.\n\n"
     (format "(setq debbugs-gnu-local-tags '%S)"
             (sort (copy-sequence debbugs-gnu-local-tags) '<)))))

(defvar debbugs-gnu-current-query nil
  "The query object of the current search.
It will be applied server-side, when calling `debbugs-get-bugs'.
It has the same format as `debbugs-gnu-default-suppress-bugs'.")

(defvar debbugs-gnu-current-filter nil
  "The filter object for the current search.
It will be applied client-side, when parsing the results of
`debbugs-get-status'.  It has a similar format as
`debbugs-gnu-default-suppress-bugs'.  In case of keys representing
a date, value is the cons cell \(BEFORE . AFTER\).")

(defun debbugs-gnu-calendar-read (prompt acceptable &optional initial-contents)
  "Return a string read from the minibuffer.
Derived from `calendar-read'."
  (let ((value (read-string prompt initial-contents)))
    (while (not (funcall acceptable value))
      (setq value (read-string prompt initial-contents)))
    value))

(defconst debbugs-gnu-phrase-prompt
  (propertize
   "Enter search phrase: "
   'help-echo "\
The search phrase contains words to be searched for, combined by
operators like AND, ANDNOT and OR.  If there is no operator
between the words, AND is used by default.  The phrase can also
be empty, in this case only the following attributes are used for
search."))

;;;###autoload
(defun debbugs-gnu-search ()
  "Search for Emacs bugs interactively.
Search arguments are requested interactively.  The \"search
phrase\" is used for full text search in the bugs database.
Further key-value pairs are requested until an empty key is
returned.  If a key cannot be queried by a SOAP request, it is
marked as \"client-side filter\"."
  (interactive)

  (unwind-protect
      (let ((date-format "\\([[:digit:]]\\{4\\}\\)-\\([[:digit:]]\\{1,2\\}\\)-\\([[:digit:]]\\{1,2\\}\\)")
            key val1 val2 phrase severities packages archivedp)

        ;; Check for the phrase.
        (setq phrase (read-string debbugs-gnu-phrase-prompt))
        (if (zerop (length phrase))
            (setq phrase nil)
          (add-to-list 'debbugs-gnu-current-query (cons 'phrase phrase)))

        ;; The other queries.
        (catch :finished
          (while t
            (setq key (completing-read
                       "Enter attribute: "
                       (if phrase
                           '("severity" "package" "tags" "submitter" "date"
                             "subject" "status")
                         '("severity" "package" "archive" "src" "tag"
                           "owner" "submitter" "maint" "correspondent"
                           "date" "log_modified" "last_modified"
                           "found_date" "fixed_date" "unarchived"
                           "subject" "done" "forwarded" "msgid" "summary"))
                       nil t))
            (cond
             ;; Server-side queries.
             ((equal key "severity")
              (setq
               severities
               (completing-read-multiple
                "Enter severities: " debbugs-gnu-all-severities nil t
                (mapconcat 'identity debbugs-gnu-default-severities ","))))

             ((equal key "package")
              (setq
               packages
               (completing-read-multiple
                "Enter packages: " debbugs-gnu-all-packages nil t
                (mapconcat 'identity debbugs-gnu-default-packages ","))))

             ((equal key "archive")
              ;; We simplify, by assuming just archived bugs are requested.
              (setq archivedp t))

             ((member key '("src" "tag" "tags"))
              (setq val1 (read-string (format "Enter %s: " key)))
              (when (not (zerop (length val1)))
                (add-to-list
                 'debbugs-gnu-current-query (cons (intern key) val1))))

             ((member key '("owner" "submitter" "maint" "correspondent"))
              (setq val1 (read-string "Enter email address: "))
              (when (not (zerop (length val1)))
                (add-to-list
                 'debbugs-gnu-current-query (cons (intern key) val1))))

             ((equal key "status")
              (setq
               val1
               (completing-read "Enter status: " '("done" "forwarded" "open")))
              (when (not (zerop (length val1)))
                (add-to-list
                 'debbugs-gnu-current-query (cons (intern key) val1))))

             ;; Client-side filters.
             ((member key '("date" "log_modified" "last_modified"
                            "found_date" "fixed_date" "unarchived"))
              (setq val1
                    (debbugs-gnu-calendar-read
                     (format "Enter %s before YYYY-MM-DD%s: "
                             key (if phrase "" " (client-side filter)"))
                     (lambda (x)
                       (string-match (concat "^\\(" date-format "\\|\\)$") x))))
              (if (string-match date-format val1)
                  (setq val1 (floor
                              (float-time
                               (encode-time
                                0 0 0
                                (string-to-number (match-string 3 val1))
                                (string-to-number (match-string 2 val1))
                                (string-to-number (match-string 1 val1))))))
                (setq val1 nil))
              (setq val2
                    (debbugs-gnu-calendar-read
                     (format "Enter %s after YYYY-MM-DD%s: "
                             key (if phrase "" " (client-side filter)"))
                     (lambda (x)
                       (string-match (concat "^\\(" date-format "\\|\\)$") x))))
              (if (string-match date-format val2)
                  (setq val2 (floor
                              (float-time
                               (encode-time
                                0 0 0
                                (string-to-number (match-string 3 val2))
                                (string-to-number (match-string 2 val2))
                                (string-to-number (match-string 1 val2))))))
                (setq val2 nil))
              (when (or val1 val2)
                (add-to-list
                 (if phrase
                     'debbugs-gnu-current-query 'debbugs-gnu-current-filter)
                 (cons (intern key) (cons val1 val2)))))

             ((not (zerop (length key)))
              (setq val1
                    (funcall
                     (if phrase 'read-string 'read-regexp)
                     (format "Enter %s%s"
                             key (if phrase ": " " (client-side filter)"))))
              (when (not (zerop (length val1)))
                (add-to-list
                 (if phrase
                     'debbugs-gnu-current-query 'debbugs-gnu-current-filter)
                 (cons (intern key) val1))))

             ;; The End.
             (t (throw :finished nil)))))

        ;; Do the search.
        (debbugs-gnu severities packages archivedp))

    ;; Reset query and filter.
    (setq debbugs-gnu-current-query nil
          debbugs-gnu-current-filter nil)))

(defvar debbugs-gnu-current-limit nil)
(defvar debbugs-gnu-current-suppress nil)

;;;###autoload
(defun debbugs-gnu (severities &optional packages archivedp suppress tags)
  "List all outstanding bugs."
  (interactive
   (let (severities archivedp)
     (list
      (setq severities
            (completing-read-multiple
             "Severities: " debbugs-gnu-all-severities nil t
             (mapconcat 'identity debbugs-gnu-default-severities ",")))
      ;; The next parameters are asked only when there is a prefix.
      (if current-prefix-arg
          (completing-read-multiple
           "Packages: " debbugs-gnu-all-packages nil t
           (mapconcat 'identity debbugs-gnu-default-packages ","))
        debbugs-gnu-default-packages)
      (when current-prefix-arg
        (setq archivedp (y-or-n-p "Show archived bugs?")))
      (when (and current-prefix-arg (not archivedp))
        (y-or-n-p "Suppress unwanted bugs?"))
      ;; This one must be asked for severity "tagged".
      (when (member "tagged" severities)
        (split-string (read-string "User tag(s): ") "," t)))))

  ;; Initialize variables.
  (when (and (file-exists-p debbugs-gnu-persistency-file)
             (not debbugs-gnu-local-tags))
    (with-temp-buffer
      (insert-file-contents debbugs-gnu-persistency-file)
      (eval (read (current-buffer)))))

  ;; Add queries.
  (dolist (severity (if (consp severities) severities (list severities)))
    (when (not (zerop (length severity)))
      (add-to-list 'debbugs-gnu-current-query (cons 'severity severity))))
  (dolist (package (if (consp packages) packages (list packages)))
    (when (not (zerop (length package)))
      (add-to-list 'debbugs-gnu-current-query (cons 'package package))))
  (when archivedp
    (add-to-list 'debbugs-gnu-current-query '(archive . "1")))
  (when suppress
    (add-to-list 'debbugs-gnu-current-query '(status . "open"))
    (add-to-list 'debbugs-gnu-current-query '(status . "forwarded"))
    (setq debbugs-gnu-current-suppress suppress))
  (dolist (tag (if (consp tags) tags (list tags)))
    (when (not (zerop (length tag)))
      (add-to-list 'debbugs-gnu-current-query (cons 'tag tag))))

  ;; Show result.
  (debbugs-gnu-show-reports)

  ;; Reset query and filter.
  (setq debbugs-gnu-current-query nil
        debbugs-gnu-current-filter nil))

(defun debbugs-gnu-get-bugs (query)
  "Retrieve bugs numbers from debbugs.gnu.org according search criteria."
  (let* ((debbugs-port "gnu.org")
         (bugs (assoc 'bugs query))
         (tags (assoc 'tag query))
         (local-tags (and (member '(severity . "tagged") query) (not tags)))
         (phrase (assoc 'phrase query))
         args)
    ;; Compile query arguments.
    (unless (or query tags)
      (dolist (elt debbugs-gnu-default-packages)
        (setq args (append args (list :package elt)))))
    (dolist (elt query)
      (unless (equal elt '(severity . "tagged"))
        (setq args
              (append
               args
               (if phrase
                   (cond
                    ((eq (car elt) 'phrase)
                     (list (list :phrase (cdr elt) :max 500)))
                    ((eq (car elt) 'date)
                     (list (list :date (cddr elt) (cadr elt)
                                 :operator "NUMBT")))
                    (t
                     (list (list (intern (concat ":" (symbol-name (car elt))))
                                 (cdr elt) :operator "ISTRINC"))))
                 (list (intern (concat ":" (symbol-name (car elt))))
                       (cdr elt)))))))

    (sort
     (cond
      ;; If the query is just a list of bug numbers, we return them.
      (bugs (cdr bugs))
      ;; If the query contains the pseudo-severity "tagged", we return
      ;; just the local tagged bugs.
      (local-tags (copy-sequence debbugs-gnu-local-tags))
      ;; A full text query.
      (phrase
       (mapcar
        (lambda (x) (cdr (assoc "id" x)))
        (apply 'debbugs-search-est args)))
      ;; User tags.
      (tags
       (setq args (mapcar (lambda (x) (if (eq x :package) :user x)) args))
       (apply 'debbugs-get-usertag args))
      ;; Otherwise, we retrieve the bugs from the server.
      (t (apply 'debbugs-get-bugs args)))
     ;; Sort function.
     '<)))

(defun debbugs-gnu-show-reports ()
  "Show bug reports."
  (let ((inhibit-read-only t)
        (debbugs-port "gnu.org")
        (buffer-name "*Emacs Bugs*")
        all-proc)
    ;; The tabulated mode sets several local variables.  We must get
    ;; rid of them.
    (when (get-buffer buffer-name)
      (kill-buffer buffer-name))
    (switch-to-buffer (get-buffer-create buffer-name))
    (debbugs-gnu-mode)

    ;; Retrieve all bugs in chunks of `debbugs-gnu-default-hits-per-page'.
    (let ((bug-ids (debbugs-gnu-get-bugs debbugs-gnu-current-query))
          (hits debbugs-gnu-default-hits-per-page)
          curr-ids)
      (while bug-ids
        (setq curr-ids (butlast bug-ids (- (length bug-ids) hits))
              bug-ids (last bug-ids (- (length bug-ids) hits))
              all-proc
              (append all-proc
                      (list
                       (async-start
                        `(lambda ()
                           (load ,(locate-library "debbugs"))
                           (apply 'debbugs-get-status ',curr-ids))))))))

    ;; Print bug reports.
    (dolist (proc all-proc)
      (dolist (status (async-get proc))
        (let* ((id (cdr (assq 'id status)))
               (words
                (mapconcat
                 'identity
                 (cons (cdr (assq 'severity status))
                       (cdr (assq 'keywords status)))
                 ","))
               (address (mail-header-parse-address
                         (decode-coding-string (cdr (assq 'originator status))
                                               'utf-8)))
               (owner (if (cdr (assq 'owner status))
                          (car (mail-header-parse-address
                                (decode-coding-string (cdr (assq 'owner status))
                                                      'utf-8)))))
               (subject (decode-coding-string (cdr (assq 'subject status))
                                              'utf-8))
               merged)
          (unless (equal (cdr (assq 'pending status)) "pending")
            (setq words (concat words "," (cdr (assq 'pending status)))))
          (let ((packages (delete "emacs" (cdr (assq 'package status)))))
            (when packages
              (setq words
                    (concat words "," (mapconcat 'identity packages ",")))))
          (when (setq merged (cdr (assq 'mergedwith status)))
            (setq words (format "%s,%s"
                                (if (numberp merged)
                                    merged
                                  (mapconcat 'number-to-string merged ","))
                                words)))
          (when (or (not merged)
                    (not (let ((found nil))
                           (dolist (id (if (listp merged)
                                           merged
                                         (list merged)))
                             (dolist (entry tabulated-list-entries)
                               (when (equal id (cdr (assq 'id (car entry))))
                                 (setq found t))))
                           found)))
            (add-to-list
             'tabulated-list-entries
             (list
              status
              (vector
               (propertize
                (format "%5d" id)
                'face
                ;; Mark tagged bugs.
                (if (memq id debbugs-gnu-local-tags)
                    'debbugs-gnu-tagged
                  'default))
               (propertize
                ;; Mark status and age.
                words
                'face
                (cond
                 ((cdr (assq 'archived status))
                  'debbugs-gnu-archived)
                 ((equal (cdr (assq 'pending status)) "done")
                  'debbugs-gnu-done)
                 ((member "pending" (cdr (assq 'keywords status)))
                  'debbugs-gnu-pending)
                 ((= (cdr (assq 'date status))
                     (cdr (assq 'log_modified status)))
                  'debbugs-gnu-new)
                 ((< (- (float-time)
                        (cdr (assq 'log_modified status)))
                     (* 60 60 24 7 2))
                  'debbugs-gnu-handled)
                 (t
                  'debbugs-gnu-stale)))
               (propertize
                ;; Prefer the name over the address.
                (or (cdr address)
                    (car address))
                'face
                ;; Mark own submitted bugs.
                (if (and (stringp (car address))
                         (string-equal (car address) user-mail-address))
                    'debbugs-gnu-tagged
                  'default))
               (propertize
                subject
                'face
                ;; Mark owned bugs.
                (if (and (stringp owner)
                         (string-equal owner user-mail-address))
                    'debbugs-gnu-tagged
                  'default))))
             'append)))))

    (tabulated-list-init-header)
    (tabulated-list-print)

    (set-buffer-modified-p nil)
    (goto-char (point-min))))

(defun debbugs-gnu-print-entry (list-id cols)
  "Insert a debbugs entry at point.
Used instead of `tabulated-list-print-entry'."
  (let ((beg (point))
        (pos 0)
        (case-fold-search t)
        (id               (aref cols 0))
        (id-length        (nth 1 (aref tabulated-list-format 0)))
        (state            (aref cols 1))
        (state-length     (nth 1 (aref tabulated-list-format 1)))
        (submitter        (aref cols 2))
        (submitter-length (nth 1 (aref tabulated-list-format 2)))
        (title            (aref cols 3))
        (title-length     (nth 1 (aref tabulated-list-format 3))))
    (when (and
           ;; We may have a narrowing in effect.
           (or (not debbugs-gnu-current-limit)
               (memq (cdr (assq 'id list-id)) debbugs-gnu-current-limit))
           ;; Filter suppressed bugs.
           (or (not debbugs-gnu-current-suppress)
               (and (not (memq (cdr (assq 'id list-id)) debbugs-gnu-local-tags))
                    (not (catch :suppress
                           (dolist (check debbugs-gnu-default-suppress-bugs)
                             (when
                                 (string-match
                                  (cdr check)
                                  (or (cdr (assq (car check) list-id)) ""))
                               (throw :suppress t)))))))
           ;; Filter search list.
           (not (catch :suppress
                  (dolist (check debbugs-gnu-current-filter)
                    (let ((val (cdr (assq (car check) list-id))))
                      (if (stringp (cdr check))
                          ;; Regular expression.
                          (when (not (string-match (cdr check) (or val "")))
                            (throw :suppress t))
                        ;; Time value.
                        (when (or (and (numberp (cadr check))
                                       (< (cadr check) val))
                                  (and (numberp (cddr check))
                                       (> (cddr check) val)))
                          (throw :suppress t))))))))

      ;; Insert id.
      (indent-to (- id-length (length id)))
      (insert id)
      ;; Insert state.
      (indent-to (setq pos (+ pos id-length 1)) 1)
      (insert (if (> (length state) state-length)
                  (propertize (substring state 0 state-length)
                              'help-echo state)
                state))
      ;; Insert submitter.
      (indent-to (setq pos (+ pos state-length 1)) 1)
      (insert "[" (if (> (length submitter) (- submitter-length 2))
                      (propertize (substring submitter 0 (- submitter-length 2))
                                  'help-echo submitter)
                    submitter))
      (indent-to (+ pos (1- submitter-length)))
      (insert "]")
      ;; Insert title.
      (indent-to (setq pos (+ pos submitter-length 1)) 1)
      (insert (propertize title 'help-echo title))
      ;; Add properties.
      (add-text-properties
       beg (point)
       `(tabulated-list-id ,list-id mouse-face highlight))
      (insert ?\n))))

(defvar debbugs-gnu-mode-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map tabulated-list-mode-map)
    (define-key map "\r" 'debbugs-gnu-select-report)
    (define-key map [mouse-1] 'debbugs-gnu-select-report)
    (define-key map [mouse-2] 'debbugs-gnu-select-report)
    (define-key map "s" 'debbugs-gnu-toggle-sort)
    (define-key map "t" 'debbugs-gnu-toggle-tag)
    (define-key map "d" 'debbugs-gnu-display-status)
    (define-key map "g" 'debbugs-gnu-rescan)
    (define-key map "x" 'debbugs-gnu-toggle-suppress)
    (define-key map "/" 'debbugs-gnu-narrow-to-status)
    (define-key map "w" 'debbugs-gnu-widen)
    (define-key map "b" 'debbugs-gnu-show-blocked-by-reports)
    (define-key map "B" 'debbugs-gnu-show-blocking-reports)
    (define-key map "C" 'debbugs-gnu-send-control-message)
    (define-key map "R" 'debbugs-gnu-show-all-blocking-reports)
    map))

(defun debbugs-gnu-rescan ()
  "Rescan the current set of bug reports."
  (interactive)
  ;; Refresh the buffer.  `save-excursion' does not work, so we
  ;; remember the position.
  (let ((pos (point)))
    (debbugs-gnu-show-reports)
    (goto-char pos)))

(defvar debbugs-gnu-sort-state 'number)

(define-derived-mode debbugs-gnu-mode tabulated-list-mode "Debbugs"
  "Major mode for listing bug reports.

All normal editing commands are switched off.
\\<debbugs-gnu-mode-map>

The following commands are available:

\\{debbugs-gnu-mode-map}"
  (set (make-local-variable 'debbugs-gnu-sort-state) 'number)
  (set (make-local-variable 'debbugs-gnu-current-limit) nil)
  (set (make-local-variable 'debbugs-gnu-current-suppress) nil)
  (setq tabulated-list-format [("Id"         5 debbugs-gnu-sort-id)
                               ("State"     20 debbugs-gnu-sort-state)
                               ("Submitter" 25 t)
                               ("Title"     10 debbugs-gnu-sort-title)])
  (setq tabulated-list-sort-key (cons "Id" nil))
  (setq tabulated-list-printer 'debbugs-gnu-print-entry)
  (buffer-disable-undo)
  (setq truncate-lines t)
  (setq buffer-read-only t))

(defun debbugs-gnu-sort-id (s1 s2)
  (< (cdr (assq 'id (car s1)))
     (cdr (assq 'id (car s2)))))

(defconst debbugs-gnu-state-preference
  '((debbugs-gnu-new . 1)
    (debbugs-gnu-stale . 2)
    (debbugs-gnu-handled . 3)
    (debbugs-gnu-done . 4)
    (debbugs-gnu-pending . 5)))

(defun debbugs-gnu-get-state-preference (face-string)
  (or (cdr (assq (get-text-property 0 'face face-string)
                 debbugs-gnu-state-preference))
      10))

(defconst debbugs-gnu-severity-preference
  '(("serious" . 1)
    ("important" . 2)
    ("normal" . 3)
    ("minor" . 4)
    ("wishlist" . 5)))

(defun debbugs-gnu-get-severity-preference (state)
  (or (cdr (assoc (cdr (assq 'severity state))
                  debbugs-gnu-severity-preference))
      10))

(defun debbugs-gnu-sort-state (s1 s2)
  (let ((id1 (cdr (assq 'id (car s1))))
        (age1 (debbugs-gnu-get-state-preference (aref (nth 1 s1) 1)))
        (id2 (cdr (assq 'id (car s2))))
        (age2 (debbugs-gnu-get-state-preference (aref (nth 1 s2) 1))))
    (cond
     ;; Tagged bugs go to the end.
     ((and (not (memq id1 debbugs-gnu-local-tags))
           (memq id2 debbugs-gnu-local-tags))
      t)
     ((and (memq id1 debbugs-gnu-local-tags)
           (not (memq id2 debbugs-gnu-local-tags)))
      nil)
     ;; Then, we check the age of the bugs.
     ((< age1 age2)
      t)
     ((> age1 age2)
      nil)
     ;; If they have the same age, we check for severity.
     ((< (debbugs-gnu-get-severity-preference (car s1))
         (debbugs-gnu-get-severity-preference (car s2)))
      t)
     (t nil))))

(defun debbugs-gnu-sort-title (s1 s2)
  (let ((owner (if (cdr (assq 'owner (car s1)))
                   (car (mail-header-parse-address
                         (decode-coding-string (cdr (assq 'owner (car s1)))
                                               'utf-8))))))
    (and (stringp owner)
         (string-equal owner user-mail-address))))

(defun debbugs-gnu-toggle-sort ()
  "Toggle sorting by age and by state."
  (interactive)
  (if (eq debbugs-gnu-sort-state 'number)
      (progn
        (setq debbugs-gnu-sort-state 'state)
        (setq tabulated-list-sort-key (cons "Id" nil)))
    (setq debbugs-gnu-sort-state 'number)
    (setq tabulated-list-sort-key (cons "State" nil)))
  (tabulated-list-init-header)
  (tabulated-list-print))

(defun debbugs-gnu-widen ()
  "Display all the currently selected bug reports."
  (interactive)
  (let ((id (debbugs-gnu-current-id t))
        (inhibit-read-only t))
    (setq debbugs-gnu-current-limit nil)
    (tabulated-list-init-header)
    (tabulated-list-print)
    (when id
      (debbugs-gnu-goto id))))

(defun debbugs-gnu-show-blocked-by-reports ()
  "Display all bug reports this report is blocked by."
  (interactive)
  (let ((id (debbugs-gnu-current-id))
        (status (debbugs-gnu-current-status)))
    (if (null (cdr (assq 'blockedby status)))
        (message "Bug %d is not blocked by any other bug" id)
      (apply 'debbugs-gnu-bugs (cdr (assq 'blockedby status))))))

(defun debbugs-gnu-show-blocking-reports ()
  "Display all bug reports this report is blocking."
  (interactive)
  (let ((id (debbugs-gnu-current-id))
        (status (debbugs-gnu-current-status)))
    (if (null (cdr (assq 'blocks status)))
        (message "Bug %d is not blocking any other bug" id)
      (apply 'debbugs-gnu-bugs (cdr (assq 'blocks status))))))

(defun debbugs-gnu-show-all-blocking-reports ()
  "Narrow the display to just the reports that are blocking a release."
  (interactive)
  (let ((blockers (cdr (assq 'blockedby
                             (car (debbugs-get-status
                                   debbugs-gnu-blocking-report)))))
        (id (debbugs-gnu-current-id t))
        (inhibit-read-only t)
        status)
    (setq debbugs-gnu-current-limit nil)
    (goto-char (point-min))
    (while (not (eobp))
      (setq status (debbugs-gnu-current-status))
      (if (not (memq (cdr (assq 'id status)) blockers))
          (delete-region (point) (progn (forward-line 1) (point)))
        (push (cdr (assq 'id status)) debbugs-gnu-current-limit)
        (forward-line 1)))
    (when id
      (debbugs-gnu-goto id))))

(defun debbugs-gnu-narrow-to-status (string &optional status-only)
  "Only display the bugs matching STRING.
If STATUS-ONLY (the prefix), ignore matches in the From and
Subject fields."
  (interactive "sNarrow to: \nP")
  (let ((id (debbugs-gnu-current-id t))
        (inhibit-read-only t)
        status)
    (setq debbugs-gnu-current-limit nil)
    (if (equal string "")
        (debbugs-gnu-toggle-suppress)
      (goto-char (point-min))
      (while (not (eobp))
        (setq status (debbugs-gnu-current-status))
        (if (and (not (member string (assq 'keywords status)))
                 (not (equal string (cdr (assq 'severity status))))
                 (or status-only
                     (not (string-match
                           string (cdr (assq 'originator status)))))
                 (or status-only
                     (not (string-match string (cdr (assq 'subject status))))))
            (delete-region (point) (progn (forward-line 1) (point)))
          (push (cdr (assq 'id status)) debbugs-gnu-current-limit)
          (forward-line 1)))
      (when id
        (debbugs-gnu-goto id)))))

(defun debbugs-gnu-goto (id)
  "Go to the line displaying bug ID."
  (goto-char (point-min))
  (while (and (not (eobp))
              (not (equal (debbugs-gnu-current-id t) id)))
    (forward-line 1)))

(defun debbugs-gnu-toggle-tag ()
  "Toggle the local tag of the report in the current line.
If a report is tagged locally, it is presumed to be of little
interest to you."
  (interactive)
  (save-excursion
    (beginning-of-line)
    (let ((inhibit-read-only t)
          (id (debbugs-gnu-current-id)))
      (if (memq id debbugs-gnu-local-tags)
          (progn
            (setq debbugs-gnu-local-tags (delq id debbugs-gnu-local-tags))
            (put-text-property (point) (+ (point) 5) 'face 'default))
        (add-to-list 'debbugs-gnu-local-tags id)
        (put-text-property
         (+ (point) (- 5 (length (number-to-string id)))) (+ (point) 5)
         'face 'debbugs-gnu-tagged))
      (debbugs-gnu--update-tag-face id)))
  (debbugs-gnu-dump-persistency-file))

(defun debbugs-gnu--update-tag-face (id)
  (dolist (entry tabulated-list-entries)
    (when (equal (cdr (assq 'id (car entry))) id)
      (aset (cadr entry) 0
            (propertize
             (format "%5d" id)
             'face
             ;; Mark tagged bugs.
             (if (memq id debbugs-gnu-local-tags)
                 'debbugs-gnu-tagged
               'default))))))

(defun debbugs-gnu-toggle-suppress ()
  "Suppress bugs marked in `debbugs-gnu-suppress-bugs'."
  (interactive)
  (setq debbugs-gnu-current-suppress (not debbugs-gnu-current-suppress))
  (tabulated-list-init-header)
  (tabulated-list-print))

(defvar debbugs-gnu-bug-number nil)
(defvar debbugs-gnu-subject nil)

(defun debbugs-gnu-current-id (&optional noerror)
  (or (cdr (assq 'id (debbugs-gnu-current-status)))
      (and (not noerror)
           (error "No bug on the current line"))))

(defun debbugs-gnu-current-status ()
  (get-text-property (line-beginning-position) 'tabulated-list-id))

(defun debbugs-gnu-current-query ()
  debbugs-gnu-current-query)

(defun debbugs-gnu-display-status (query status)
  "Display the query and status of the report on the current line."
  (interactive (list (debbugs-gnu-current-query)
                     (debbugs-gnu-current-status)))
  (switch-to-buffer "*Bug Status*")
  (let ((inhibit-read-only t))
    (erase-buffer)
    (when query (pp query (current-buffer)))
    (when status (pp status (current-buffer)))
    (goto-char (point-min)))
  (set-buffer-modified-p nil)
  (special-mode))

(defun debbugs-read-emacs-bug-with-rmail (id status merged)
  "Read email exchange for debbugs bug ID.
STATUS is the bug's status list.
MERGED is the list of bugs merged with this one."
  (let* ((mbox-dir (make-temp-file "debbugs" t))
         (mbox-fname (format "%s/bug_%d.mbox" mbox-dir id)))
    (debbugs-get-mbox id 'mboxmaint mbox-fname)
    (rmail mbox-fname)
    ;; Download messages of all the merged bug reports and append them
    ;; to the mailbox of the requested bug.
    (when merged
      (dolist (bugno merged)
        (let ((fn (make-temp-file "url")))
          (debbugs-get-mbox bugno 'mboxmaint fn)
          (rmail-get-new-mail fn)
          (delete-file fn)
          ;; Remove the 'unseen' attribute from all the messages we've
          ;; just read, so that all of them appear in the summary with
          ;; the same face.
          (while (< rmail-current-message rmail-total-messages)
            (rmail-show-message (1+ rmail-current-message))))))
    (set (make-local-variable 'debbugs-gnu-bug-number) id)
    (set (make-local-variable 'debbugs-gnu-subject)
         (format "Re: bug#%d: %s" id (cdr (assq 'subject status))))
    (rmail-summary)
    (define-key rmail-summary-mode-map "C" 'debbugs-gnu-send-control-message)
    (set-window-text-height nil 10)
    (other-window 1)
    (define-key rmail-mode-map "C" 'debbugs-gnu-send-control-message)
    (rmail-show-message 1)))

(defun debbugs-read-emacs-bug-with-gnus (id status merged)
  "Read email exchange for debbugs bug ID.
STATUS is the bug's status list.
MERGED is the list of bugs merged with this one."
  (require 'gnus-dup)
  (setq gnus-suppress-duplicates t
        gnus-save-duplicate-list t)
  ;; Use Gnus.
  (gnus-read-ephemeral-emacs-bug-group
   (cons id (if (listp merged) merged (list merged)))
   (cons (current-buffer)
         (current-window-configuration)))
  (with-current-buffer (window-buffer (selected-window))
    (set (make-local-variable 'debbugs-gnu-bug-number) id)
    (set (make-local-variable 'debbugs-gnu-subject)
         (format "Re: bug#%d: %s" id (cdr (assq 'subject status))))
    (debbugs-gnu-summary-mode 1)))

(defun debbugs-gnu-select-report ()
  "Select the report on the current line."
  (interactive)
  ;; We open the report messages.
  (let* ((status (debbugs-gnu-current-status))
         (id (cdr (assq 'id status)))
         (merged (cdr (assq 'mergedwith status))))
    (setq merged (if (listp merged) merged (list merged)))
    (cond
     ((not id)
      (message "No bug report on the current line"))
     ((eq debbugs-gnu-mail-backend 'rmail)
      (debbugs-read-emacs-bug-with-rmail id status merged))
     ((eq debbugs-gnu-mail-backend 'gnus)
      (debbugs-read-emacs-bug-with-gnus id status merged))
     (t (error "No valid mail backend specified")))))

(defvar debbugs-gnu-summary-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "C" 'debbugs-gnu-send-control-message)
    (define-key map [(meta m)] 'debbugs-gnu-apply-patch)
    map))

(define-minor-mode debbugs-gnu-summary-mode
  "Minor mode for providing a debbugs interface in Gnus summary buffers.

\\{debbugs-gnu-summary-mode-map}"
  :lighter " Debbugs" :keymap debbugs-gnu-summary-mode-map
  (set (make-local-variable 'gnus-posting-styles)
       `((".*"
          (eval
           (when (buffer-live-p gnus-article-copy)
             (with-current-buffer gnus-article-copy
               (set (make-local-variable 'message-prune-recipient-rules)
                    '((".*@debbugs.*" "emacs-pretest-bug")
                      (".*@debbugs.*" "bug-gnu-emacs")
                      ("[0-9]+@debbugs.*" "submit@debbugs.gnu.org")
                      ("[0-9]+@debbugs.*" "quiet@debbugs.gnu.org")))
               (set (make-local-variable 'message-alter-recipients-function)
                    (lambda (address)
                      (if (string-match "\\([0-9]+\\)@donarmstrong"
                                        (car address))
                          (let ((new (format "%s@debbugs.gnu.org"
                                             (match-string 1 (car address)))))
                            (cons new new))
                        address)))
               ;; `gnus-posting-styles' is eval'ed after
               ;; `message-simplify-subject'.  So we cannot use m-s-s.
               (setq subject ,debbugs-gnu-subject))))))))

(defun debbugs-gnu-guess-current-id ()
  "Guess the ID based on \"#23\"."
  (save-excursion
    (beginning-of-line)
    (and
     (or (re-search-forward "#\\([0-9]+\\)" (line-end-position) t)
         (progn
           (goto-char (point-min))
           (re-search-forward "#\\([0-9]+\\)" nil t)))
     (string-to-number (match-string 1)))))

(defun debbugs-gnu-send-control-message (message &optional reverse)
  "Send a control message for the current bug report.
You can set the severity or add a tag, or close the report.  If
you use the special \"done\" MESSAGE, the report will be marked as
fixed, and then closed.

If given a prefix, and given a tag to set, the tag will be
removed instead."
  (interactive
   (list (completing-read
          "Control message: "
          '("serious" "important" "normal" "minor" "wishlist"
            "done" "donenotabug" "donewontfix" "doneunreproducible"
            "unarchive" "unmerge" "reopen" "close"
            "merge" "forcemerge"
            "block" "unblock"
            "owner" "noowner"
            "invalid"
            "reassign"
            "patch" "wontfix" "moreinfo" "unreproducible" "fixed" "notabug"
            "pending" "help" "security" "confirmed"
            "usertag")
          nil t)
         current-prefix-arg))
  (let* ((id (or debbugs-gnu-bug-number ; Set on group entry.
                 (debbugs-gnu-guess-current-id)
                 (debbugs-gnu-current-id)))
         (version
          (when (member message '("close" "done"))
            (read-string
             "Version: "
             (cond
              ;; Emacs development versions.
              ((string-match
                "^\\([0-9]+\\)\\.\\([0-9]+\\)\\.\\([0-9]+\\)\\." emacs-version)
               (format "%s.%d"
                       (match-string 1 emacs-version)
                       (1+ (string-to-number (match-string 2 emacs-version)))))
              ;; Emacs release versions.
              ((string-match
                "^\\([0-9]+\\)\\.\\([0-9]+\\)\\.\\([0-9]+\\)$" emacs-version)
               (format "%s.%s"
                       (match-string 1 emacs-version)
                       (match-string 2 emacs-version)))
              (t emacs-version)))))
         (status (debbugs-gnu-current-status)))
    (with-temp-buffer
      (insert "To: control@debbugs.gnu.org\n"
              "From: " (message-make-from) "\n"
              (format "Subject: control message for bug #%d\n" id)
              "\n"
              (cond
               ((member message '("unarchive" "unmerge" "reopen" "noowner"))
                (format "%s %d\n" message id))
               ((member message '("merge" "forcemerge"))
                (format "%s %d %s\n" message id
                        (read-string "Merge with bug #: ")))
               ((member message '("block" "unblock"))
                (format
                 "%s %d by %s\n" message id
                 (mapconcat
                  'identity
                  (completing-read-multiple
                   (format "%s with bug(s) #: " (capitalize message))
                   (if (equal message "unblock")
                       (mapcar 'number-to-string
                               (cdr (assq 'blockedby status))))
                   nil (and (equal message "unblock") status))
                  " ")))
               ((equal message "owner")
                (format "owner %d !\n" id))
               ((equal message "reassign")
                (format "reassign %d %s\n" id (read-string "Package(s): ")))
               ((equal message "close")
                (format "close %d %s\n" id version))
               ((equal message "done")
                (format "tags %d fixed\nclose %d %s\n" id id version))
               ((member message '("donenotabug" "donewontfix"
                                  "doneunreproducible"))
                (format "tags %d %s\nclose %d\n" id (substring message 4) id))
               ((member message '("serious" "important" "normal"
                                  "minor" "wishlist"))
                (format "severity %d %s\n" id message))
               ((equal message "invalid")
                (format "tags %d notabug\ntags %d wontfix\nclose %d\n"
                        id id id))
               ((equal message "usertag")
                (format "user %s\nusertag %d %s\n"
                        (completing-read
                         "Package name or email address: "
                         (append
                          debbugs-gnu-all-packages (list user-mail-address))
                         nil nil (car debbugs-gnu-default-packages))
                        id (read-string "User tag: ")))
               (t
                (format "tags %d%s %s\n"
                        id (if reverse " -" "")
                        message))))
      (funcall send-mail-function))))

(defvar debbugs-gnu-usertags-mode-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map tabulated-list-mode-map)
    (define-key map "\r" 'debbugs-gnu-select-usertag)
    (define-key map [mouse-1] 'debbugs-gnu-select-usertag)
    (define-key map [mouse-2] 'debbugs-gnu-select-usertag)
    map))

(define-derived-mode debbugs-gnu-usertags-mode tabulated-list-mode "Usertags"
  "Major mode for listing user tags.

All normal editing commands are switched off.
\\<debbugs-gnu-usertags-mode-map>

The following commands are available:

\\{debbugs-gnu-usertags-mode-map}"
  (buffer-disable-undo)
  (setq truncate-lines t)
  (setq buffer-read-only t))

;;;###autoload
(defun debbugs-gnu-usertags (&rest users)
  "List all user tags for USERS, which is \(\"emacs\"\) by default."
  (interactive
   (if current-prefix-arg
       (completing-read-multiple
        "Package name(s) or email address: "
        (append debbugs-gnu-all-packages (list user-mail-address)) nil nil
        (mapconcat 'identity debbugs-gnu-default-packages ","))
     debbugs-gnu-default-packages))

  (unwind-protect
      (let ((inhibit-read-only t)
            (debbugs-port "gnu.org")
            (buffer-name "*Emacs User Tags*")
            (user-tab-length
             (1+ (apply 'max (length "User") (mapcar 'length users)))))

        ;; Initialize variables.
        (when (and (file-exists-p debbugs-gnu-persistency-file)
                   (not debbugs-gnu-local-tags))
          (with-temp-buffer
            (insert-file-contents debbugs-gnu-persistency-file)
            (eval (read (current-buffer)))))

        ;; Create buffer.
        (when (get-buffer buffer-name)
          (kill-buffer buffer-name))
        (switch-to-buffer (get-buffer-create buffer-name))
        (debbugs-gnu-usertags-mode)
        (setq tabulated-list-format `[("User" ,user-tab-length t)
                                      ("Tag"  10 t)])
        (setq tabulated-list-sort-key (cons "User" nil))
        ;(setq tabulated-list-printer 'debbugs-gnu-print-entry)

        ;; Retrieve user tags.
        (dolist (user users)
          (dolist (tag (sort (debbugs-get-usertag :user user) 'string<))
            (add-to-list
             'tabulated-list-entries
             ;; `tabulated-list-id' is the parameter list for `debbugs-gnu'.
             `((("tagged") (,user) nil nil (,tag))
               ,(vector (propertize user 'mouse-face 'highlight)
                        (propertize tag  'mouse-face 'highlight)))
             'append)))

        ;; Add local tags.
        (when debbugs-gnu-local-tags
          (add-to-list
             'tabulated-list-entries
             `((("tagged"))
               ,(vector
                 "" (propertize "(local tags)" 'mouse-face 'highlight)))))

        ;; Show them.
        (tabulated-list-init-header)
        (tabulated-list-print)

        (set-buffer-modified-p nil)
        (goto-char (point-min)))))

(defun debbugs-gnu-select-usertag ()
  "Select the user tag on the current line."
  (interactive)
  ;; We open the bug reports.
  (let ((args (get-text-property (line-beginning-position) 'tabulated-list-id)))
    (when args (apply 'debbugs-gnu args))))

;;;###autoload
(defun debbugs-gnu-bugs (&rest bugs)
  "List all BUGS, a list of bug numbers."
  (interactive
   (mapcar 'string-to-number
           (completing-read-multiple "Bug numbers: " nil 'natnump)))
  (dolist (elt bugs)
    (unless (natnump elt) (signal 'wrong-type-argument (list 'natnump elt))))
  (add-to-list 'debbugs-gnu-current-query (cons 'bugs bugs))
  (debbugs-gnu nil))

(defvar debbugs-gnu-trunk-directory "~/src/emacs/trunk/"
  "The directory where the main source tree lives.")

(defvar debbugs-gnu-branch-directory "~/src/emacs/emacs-25/"
  "The directory where the previous source tree lives.")

(defun debbugs-gnu-apply-patch (&optional branch)
  "Apply the patch from the current message.
If given a prefix, patch in the branch directory instead."
  (interactive "P")
  (add-hook 'emacs-lisp-mode-hook 'debbugs-gnu-lisp-mode)
  (add-hook 'diff-mode-hook 'debbugs-gnu-diff-mode)
  (add-hook 'change-log-mode-hook 'debbugs-gnu-change-mode)
  (let ((rej "/tmp/debbugs-gnu.rej")
        (output-buffer (get-buffer-create "*debbugs patch*"))
        (dir (if branch
                 debbugs-gnu-branch-directory
               debbugs-gnu-trunk-directory))
        (patch-buffers nil))
    (when (file-exists-p rej)
      (delete-file rej))
    (with-current-buffer output-buffer
      (erase-buffer))
    (gnus-summary-select-article nil t)
    ;; The patches are either in MIME attachements or the main article
    ;; buffer.  Determine which.
    (gnus-with-article-buffer
      (dolist (handle (mapcar 'cdr (gnus-article-mime-handles)))
        (when (string-match "diff\\|patch" (mm-handle-media-type handle))
          (push (cons (mm-handle-encoding handle)
                      (mm-handle-buffer handle))
                patch-buffers))))
    (unless patch-buffers
      (gnus-summary-show-article 'raw)
      (article-decode-charset)
      (push (cons nil gnus-article-buffer) patch-buffers))
    (dolist (elem patch-buffers)
      (with-temp-buffer
        (insert-buffer-substring (cdr elem))
        (cond ((eq (car elem) 'base64)
               (base64-decode-region (point-min) (point-max)))
              ((eq (car elem) 'qp)
               (quoted-printable-decode-region (point-min) (point-max))))
        (debbugs-gnu-fix-patch dir)
        (call-process-region (point-min) (point-max)
                             "patch" nil output-buffer nil
                             "-r" rej "--no-backup-if-mismatch"
                             "-l" "-f"
                             "-d" (expand-file-name dir)
                             "-p1")))
    (set-buffer output-buffer)
    (when (file-exists-p rej)
      (goto-char (point-max))
      (insert-file-contents-literally rej))
    (goto-char (point-max))
    (save-some-buffers t)
    (require 'compile)
    (mapc 'kill-process compilation-in-progress)
    (compile (format "cd %s; make -k" (expand-file-name "lisp" dir)))
    (vc-dir dir)
    (vc-dir-hide-up-to-date)
    (goto-char (point-min))
    (sit-for 1)
    (vc-diff)
    ;; All these commands are asynchronous, so just wait a bit.  This
    ;; should be done properly a different way.
    (sit-for 2)
    ;; We've now done everything, so arrange the windows we need to see.
    (delete-other-windows)
    (switch-to-buffer output-buffer)
    (split-window)
    (split-window)
    (other-window 1)
    (switch-to-buffer "*compilation*")
    (goto-char (point-max))
    (other-window 1)
    (switch-to-buffer "*vc-diff*")
    (goto-char (point-min))))

(defun debbugs-gnu-fix-patch (dir)
  (setq dir (directory-file-name (expand-file-name dir)))
  (goto-char (point-min))
  (while (re-search-forward diff-file-header-re nil t)
    (goto-char (match-beginning 0))
    (let ((target-name (car (diff-hunk-file-names))))
      (when (and target-name
                 (or (not (string-match "/" target-name))
                     (and (string-match "^[ab]/" target-name)
                          (not (file-exists-p
                                (expand-file-name (substring target-name 2)
                                                  dir))))
                     (file-exists-p (expand-file-name target-name dir))))
        ;; We have a simple patch that refers to a file somewhere in the
        ;; tree.  Find it.
        (when-let ((files (directory-files-recursively
                           dir
                           (concat "^" (regexp-quote
                                        (file-name-nondirectory target-name))
                                       "$"))))
          (when (re-search-forward (concat "^[+]+ "
                                           (regexp-quote target-name)
                                           "\\([ \t\n]\\)")
                                   nil t)
            (replace-match (concat "+++ a"
                                   (substring (car files) (length dir))
                                   (match-string 1))
                           nil t)))))
    (forward-line 2)))

(defun debbugs-gnu-find-contributor (string)
  "Search through ChangeLogs to find contributors."
  (interactive "sContributor match: ")
  (let ((found 0)
        (match (concat "^[0-9].*" string)))
    (dolist (file (directory-files-recursively
                   debbugs-gnu-trunk-directory "ChangeLog\\(.[0-9]+\\)?$"))
      (with-temp-buffer
        (when (file-exists-p file)
          (insert-file-contents file))
        (goto-char (point-min))
        (while (and (re-search-forward match nil t)
                    (not (looking-at ".*tiny change")))
          (cl-incf found))))
    (message "%s is a contributor %d times" string found)
    found))

(defun debbugs-gnu-insert-changelog ()
  "Add a ChangeLog from a recently applied patch from a third party."
  (interactive)
  (let (from subject)
    (gnus-with-article-buffer
      (widen)
      (goto-char (point-min))
      (setq from (mail-extract-address-components (gnus-fetch-field "from"))
            subject (gnus-fetch-field "subject")))
    (let ((add-log-full-name (car from))
          (add-log-mailing-address (cadr from)))
      (add-change-log-entry-other-window)
      (let ((point (point)))
        (when (string-match "\\(bug#[0-9]+\\)" subject)
          (insert " (" (match-string 1 subject) ")."))
        (when (zerop (debbugs-gnu-find-contributor
                      (let ((bits (split-string (car from))))
                        (cond
                         ((>= (length bits) 2)
                          (format "%s.*%s" (car bits) (car (last bits))))
                         ((= (length bits) 1)
                          (car bits))
                         ;; Fall back on the email address.
                         (t
                          (cadr from))))))
          (goto-char (point-max))
          (end-of-line)
          (insert "  (tiny change"))
        (goto-char point)))))

(defvar debbugs-gnu-lisp-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map [(meta m)] 'debbugs-gnu-insert-changelog)
    map))

(define-minor-mode debbugs-gnu-lisp-mode
  "Minor mode for providing a debbugs interface in Lisp buffers.
\\{debbugs-gnu-lisp-mode-map}"
  :lighter " Debbugs" :keymap debbugs-gnu-lisp-mode-map)

(defvar debbugs-gnu-diff-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map [(meta m)] 'debbugs-gnu-diff-select)
    map))

(define-minor-mode debbugs-gnu-diff-mode
  "Minor mode for providing a debbugs interface in diff buffers.
\\{debbugs-gnu-diff-mode-map}"
  :lighter " Debbugs" :keymap debbugs-gnu-diff-mode-map)

(defun debbugs-gnu-diff-select ()
  "Select the diff under point."
  (interactive)
  (delete-other-windows)
  (diff-goto-source))

(defvar debbugs-gnu-change-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map [(meta m)] 'debbugs-gnu-change-checkin)
    map))

(define-minor-mode debbugs-gnu-change-mode
  "Minor mode for providing a debbugs interface in ChangeLog buffers.
\\{debbugs-gnu-change-mode-map}"
  :lighter " Debbugs" :keymap debbugs-gnu-change-mode-map)

(defun debbugs-gnu-change-checkin ()
  "Prepare checking in the current changes."
  (interactive)
  (save-some-buffers t)
   (when (get-buffer "*vc-dir*")
     (kill-buffer (get-buffer "*vc-dir*")))
   (let ((trunk (expand-file-name debbugs-gnu-trunk-directory)))
     (if (equal (cl-subseq default-directory 0 (length trunk))
                trunk)
         (vc-dir debbugs-gnu-trunk-directory)
       (vc-dir debbugs-gnu-branch-directory)))
   (goto-char (point-min))
   (while (not (search-forward "edited" nil t))
     (sit-for 0.01))
   (beginning-of-line)
   (while (search-forward "edited" nil t)
     (vc-dir-mark)
     (beginning-of-line))
   (vc-diff nil)
   (vc-next-action nil)
   (log-edit-insert-changelog t)
   (delete-other-windows)
   (split-window)
   (other-window 1)
   (switch-to-buffer "*vc-diff*")
   (other-window 1))

(provide 'debbugs-gnu)

;;; TODO:

;;; debbugs-gnu.el ends here