lisp/gnus/gnus-bookmark.el

   1 ;;; gnus-bookmark.el --- Bookmarks in Gnus
   2
   3 ;; Copyright (C) 2006-2013 Free Software Foundation, Inc.
   4
   5 ;; Author: Bastien Guerry <bzg AT altern DOT org>
   6 ;; Keywords: news
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; This file implements real bookmarks for Gnus, closely following the way
  26 ;; `bookmark.el' handles bookmarks.  Most of the code comes from
  27 ;; `bookmark.el'.
  28 ;;
  29 ;; Set a Gnus bookmark:
  30 ;; M-x `gnus-bookmark-set' from the summary buffer.
  31 ;;
  32 ;; Jump to a Gnus bookmark:
  33 ;; M-x `gnus-bookmark-jump'.
  34 ;;
  35 ;; Display a list of bookmarks
  36 ;; M-x `gnus-bookmark-bmenu-list'.
  37 ;;
  38
  39 ;;; Todo:
  40
  41 ;; - add tags to bookmarks
  42 ;; - don't write file each time a bookmark is created
  43 ;; - better annotation interactive buffer
  44 ;; - edit annotation in gnus-bookmark-bmenu
  45 ;; - sort gnus-bookmark-buffer by author/subject/date/group/message-id
  46 ;; - auto-bmk-name customizable format
  47 ;; - renaming bookmarks in gnus-bookmark-bmenu-list
  48 ;; - better (formatted string) display in bmenu-list
  49
  50 ;; - Integrate the `gnus-summary-*-bookmark' functionality
  51 ;; - Initialize defcustoms from corresponding `bookmark.el' variables?
  52
  53 ;;; Code:
  54
  55 (require 'gnus-sum)
  56
  57 ;; FIXME: should avoid using C-c (no?)
  58 ;; (define-key gnus-summary-mode-map "\C-crm" 'gnus-bookmark-set)
  59 ;; (define-key global-map "\C-crb" 'gnus-bookmark-jump)
  60 ;; (define-key global-map "\C-crj" 'gnus-bookmark-jump)
  61 ;; (define-key global-map "\C-crl" 'gnus-bookmark-bmenu-list)
  62
  63 ;; FIXME: Add keybindings, see
  64 ;; http://thread.gmane.org/gmane.emacs.gnus.general/63101/focus=63379
  65 ;; http://thread.gmane.org/v9fxx9fkm4.fsf@marauder.physik.uni-ulm.de
  66
  67 ;; FIXME: Check if `gnus-bookmark.el' should use
  68 ;; `bookmark-make-cell-function'.
  69 ;; Cf. http://article.gmane.org/gmane.emacs.gnus.general/66076
  70
  71 (defgroup gnus-bookmark nil
  72   "Setting, annotation and jumping to Gnus bookmarks."
  73   :group 'gnus)
  74
  75 (defcustom gnus-bookmark-default-file
  76   (cond
  77    ;; Backward compatibility with previous versions:
  78    ((file-exists-p "~/.gnus.bmk") "~/.gnus.bmk")
  79    (t (nnheader-concat gnus-directory "bookmarks.el")))
  80   "The default Gnus bookmarks file."
  81   :type 'string
  82   :group 'gnus-bookmark)
  83
  84 (defcustom gnus-bookmark-file-coding-system
  85   (if (mm-coding-system-p 'iso-2022-7bit)
  86       'iso-2022-7bit)
  87   "Coding system used for writing Gnus bookmark files."
  88   :type '(symbol :tag "Coding system")
  89   :group 'gnus-bookmark)
  90
  91 (defcustom gnus-bookmark-sort-flag t
  92   "Non-nil means Gnus bookmarks are sorted by bookmark names.
  93 Otherwise they will be displayed in LIFO order (that is,
  94 most recently set ones come first, oldest ones come last)."
  95   :type 'boolean
  96   :group 'gnus-bookmark)
  97
  98 (defcustom gnus-bookmark-bmenu-toggle-infos t
  99   "Non-nil means show details when listing Gnus bookmarks.
 100 List of details is defined in `gnus-bookmark-bookmark-inline-details'.
 101 This may result in truncated bookmark names.  To disable this, put the
 102 following in your `.emacs' file:
 103
 104 \(setq gnus-bookmark-bmenu-toggle-infos nil\)"
 105   :type 'boolean
 106   :group 'gnus-bookmark)
 107
 108 (defcustom gnus-bookmark-bmenu-file-column 30
 109   "Column at which to display details in a buffer listing Gnus bookmarks.
 110 You can toggle whether details are shown with \\<gnus-bookmark-bmenu-mode-map>\\[gnus-bookmark-bmenu-toggle-infos]."
 111   :type 'integer
 112   :group 'gnus-bookmark)
 113
 114 (defcustom gnus-bookmark-use-annotations nil
 115   "If non-nil, ask for an annotation when setting a bookmark."
 116   :type 'boolean
 117   :group 'gnus-bookmark)
 118
 119 (defcustom gnus-bookmark-bookmark-inline-details '(author)
 120   "Details to be shown with `gnus-bookmark-bmenu-toggle-infos'.
 121 The default value is \(subject\)."
 122   :type '(list :tag "Gnus bookmark details"
 123                (set :inline t
 124                     (const :tag "Author" author)
 125                     (const :tag "Subject" subject)
 126                     (const :tag "Date" date)
 127                     (const :tag "Group" group)
 128                     (const :tag "Message-id" message-id)))
 129   :group 'gnus-bookmark)
 130
 131 (defcustom gnus-bookmark-bookmark-details
 132   '(author subject date group annotation)
 133   "Details to be shown with `gnus-bookmark-bmenu-show-details'.
 134 The default value is \(author subject date group annotation\)."
 135   :type '(list :tag "Gnus bookmark details"
 136                (set :inline t
 137                     (const :tag "Author" author)
 138                     (const :tag "Subject" subject)
 139                     (const :tag "Date" date)
 140                     (const :tag "Group" group)
 141                     (const :tag "Message-id" message-id)
 142                     (const :tag "Annotation" annotation)))
 143   :group 'gnus-bookmark)
 144
 145 (defface gnus-bookmark-menu-heading
 146   '((t (:inherit font-lock-type-face)))
 147   "Face used to highlight the heading in Gnus bookmark menu buffers."
 148   :version "23.1" ;; No Gnus
 149   :group 'gnus-bookmark)
 150
 151 (defconst gnus-bookmark-end-of-version-stamp-marker
 152   "-*- End Of Bookmark File Format Version Stamp -*-\n"
 153   "This string marks the end of the version stamp in a Gnus bookmark file.")
 154
 155 (defconst gnus-bookmark-file-format-version 0
 156   "The current version of the format used by bookmark files.
 157 You should never need to change this.")
 158
 159 (defvar gnus-bookmark-alist ()
 160   "Association list of Gnus bookmarks and their records.
 161 The format of the alist is
 162
 163      \(BMK1 BMK2 ...\)
 164
 165 where each BMK is of the form
 166
 167 \(NAME
 168   \(group . GROUP\)
 169   \(message-id . MESSAGE-ID\)
 170   \(author . AUTHOR\)
 171   \(date . DATE\)
 172   \(subject . SUBJECT\)
 173   \(annotation . ANNOTATION\)\)
 174
 175 So the cdr of each bookmark is an alist too.")
 176
 177 (defmacro gnus-bookmark-mouse-available-p ()
 178   "Return non-nil if a mouse is available."
 179   (if (featurep 'xemacs)
 180       '(device-on-window-system-p)
 181     '(display-mouse-p)))
 182
 183 (defun gnus-bookmark-remove-properties (string)
 184   "Remove all text properties from STRING."
 185   (set-text-properties 0 (length string) nil string)
 186   string)
 187
 188 ;;;###autoload
 189 (defun gnus-bookmark-set ()
 190   "Set a bookmark for this article."
 191   (interactive)
 192   (gnus-bookmark-maybe-load-default-file)
 193   (if (or (not (derived-mode-p 'gnus-summary-mode))
 194           (not gnus-article-current))
 195       (error "Please select an article in the Gnus summary buffer")
 196     (let* ((group (car gnus-article-current))
 197            (article (cdr gnus-article-current))
 198            (header (gnus-summary-article-header article))
 199            (author (mail-header-from header))
 200            (message-id (mail-header-id header))
 201            (date (mail-header-date header))
 202            (subject (gnus-summary-subject-string))
 203            (bmk-name (gnus-bookmark-set-bookmark-name group author subject))
 204            ;; Maybe ask for annotation
 205            (annotation
 206             (if gnus-bookmark-use-annotations
 207                  (read-from-minibuffer
 208                   (format "Annotation for %s: " bmk-name)) "")))
 209       ;; Set the bookmark list
 210       (setq gnus-bookmark-alist
 211             (cons
 212              (list (gnus-bookmark-remove-properties bmk-name)
 213                    (gnus-bookmark-make-record
 214                     group message-id author date subject annotation))
 215              gnus-bookmark-alist))))
 216   (gnus-bookmark-bmenu-surreptitiously-rebuild-list)
 217   (gnus-bookmark-write-file))
 218
 219 (defun gnus-bookmark-make-record
 220   (group message-id author date subject annotation)
 221   "Return the record part of a new bookmark, given GROUP MESSAGE-ID AUTHOR DATE SUBJECT and ANNOTATION."
 222   (let ((the-record
 223          `((group . ,(gnus-bookmark-remove-properties group))
 224            (message-id . ,(gnus-bookmark-remove-properties message-id))
 225            (author . ,(gnus-bookmark-remove-properties author))
 226            (date . ,(gnus-bookmark-remove-properties date))
 227            (subject . ,(gnus-bookmark-remove-properties subject))
 228            (annotation . ,(gnus-bookmark-remove-properties annotation)))))
 229     the-record))
 230
 231 (defun gnus-bookmark-set-bookmark-name (group author subject)
 232   "Set bookmark name from GROUP AUTHOR and SUBJECT."
 233   (let* ((subject (split-string subject))
 234          (default-name-0 ;; Should be merged with -1?
 235            (concat (car (nreverse (delete "" (split-string group "[\\.:]"))))
 236                    "-" (car (split-string author))
 237                    "-" (car subject) "-" (cadr subject)))
 238          (default-name-1
 239            ;; Strip "[]" chars from the bookmark name:
 240            (gnus-replace-in-string default-name-0 "[]_[]" ""))
 241          (name (read-from-minibuffer
 242                 (format "Set bookmark (%s): " default-name-1)
 243                 nil nil nil nil
 244                 default-name-1)))
 245     (if (string-equal name "")
 246         default-name-1
 247       name)))
 248
 249 (defun gnus-bookmark-write-file ()
 250   "Write currently defined Gnus bookmarks into `gnus-bookmark-default-file'."
 251   (interactive)
 252   (save-excursion
 253     (save-window-excursion
 254       ;; Avoir warnings?
 255       ;; (message "Saving Gnus bookmarks to file %s..." gnus-bookmark-default-file)
 256       (set-buffer (get-buffer-create  " *Gnus bookmarks*"))
 257       (erase-buffer)
 258       (gnus-bookmark-insert-file-format-version-stamp)
 259       (pp gnus-bookmark-alist (current-buffer))
 260       (condition-case nil
 261           (let ((coding-system-for-write gnus-bookmark-file-coding-system))
 262             (write-region (point-min) (point-max)
 263                           gnus-bookmark-default-file))
 264         (file-error (message "Can't write %s"
 265                              gnus-bookmark-default-file)))
 266       (kill-buffer (current-buffer))
 267       (message
 268        "Saving Gnus bookmarks to file %s...done"
 269        gnus-bookmark-default-file))))
 270
 271 (defun gnus-bookmark-insert-file-format-version-stamp ()
 272   "Insert text indicating current version of Gnus bookmark file format."
 273   (insert
 274    (format ";;;; Gnus Bookmark Format Version %d %s;;;;\n"
 275            gnus-bookmark-file-format-version
 276            (if gnus-bookmark-file-coding-system
 277                (concat "-*- coding: "
 278                        (symbol-name gnus-bookmark-file-coding-system)
 279                        "; -*- ")
 280              "")))
 281   (insert ";;; This format is meant to be slightly human-readable;\n"
 282           ";;; nevertheless, you probably don't want to edit it.\n"
 283           ";;; "
 284           gnus-bookmark-end-of-version-stamp-marker))
 285
 286 ;;;###autoload
 287 (defun gnus-bookmark-jump (&optional bmk-name)
 288   "Jump to a Gnus bookmark (BMK-NAME)."
 289   (interactive)
 290   (gnus-bookmark-maybe-load-default-file)
 291   (let* ((bookmark (or bmk-name
 292                        (gnus-completing-read "Jump to bookmarked article"
 293                                              (mapcar 'car gnus-bookmark-alist))))
 294          (bmk-record (cadr (assoc bookmark gnus-bookmark-alist)))
 295          (group (cdr (assoc 'group bmk-record)))
 296          (message-id (cdr (assoc 'message-id bmk-record))))
 297     (when group
 298       (unless (get-buffer gnus-group-buffer)
 299         (gnus-no-server))
 300       (gnus-activate-group group)
 301       (gnus-group-quick-select-group 0 group))
 302     (if message-id
 303       (or (gnus-summary-goto-article message-id nil 'force)
 304           (if (fboundp 'gnus-summary-insert-cached-articles)
 305               (progn
 306                 (gnus-summary-insert-cached-articles)
 307                 (gnus-summary-goto-article message-id nil 'force))
 308             (message "Message could not be found."))))))
 309
 310 (defvar gnus-bookmark-already-loaded nil)
 311
 312 (defun gnus-bookmark-alist-from-buffer ()
 313   "Return a `gnus-bookmark-alist' from the current buffer.
 314 The buffer must of course contain Gnus bookmark format information.
 315 Does not care from where in the buffer it is called, and does not
 316 affect point."
 317   (save-excursion
 318     (goto-char (point-min))
 319     (if (search-forward
 320          gnus-bookmark-end-of-version-stamp-marker nil t)
 321         (read (current-buffer))
 322       ;; Else no hope of getting information here.
 323       (error "Not Gnus bookmark format"))))
 324
 325 (defun gnus-bookmark-load (file)
 326   "Load Gnus bookmarks from FILE (which must be in bookmark format)."
 327   (interactive
 328    (list (read-file-name
 329           (format "Load Gnus bookmarks from: (%s) "
 330                   gnus-bookmark-default-file)
 331           "~/" gnus-bookmark-default-file 'confirm)))
 332   (setq file (expand-file-name file))
 333   (if (file-readable-p file)
 334       (save-excursion
 335         (save-window-excursion
 336           (set-buffer (let ((enable-local-variables nil))
 337                         (find-file-noselect file)))
 338           (goto-char (point-min))
 339           (let ((blist (gnus-bookmark-alist-from-buffer)))
 340             (if (listp blist)
 341                 (progn (setq gnus-bookmark-already-loaded t)
 342                        (setq gnus-bookmark-alist blist))
 343               (error "Not Gnus bookmark format")))))))
 344
 345 (defun gnus-bookmark-maybe-load-default-file ()
 346   "Maybe load Gnus bookmarks in `gnus-bookmark-alist'."
 347   (and (not gnus-bookmark-already-loaded)
 348        (null gnus-bookmark-alist)
 349        (file-readable-p (expand-file-name gnus-bookmark-default-file))
 350        (gnus-bookmark-load gnus-bookmark-default-file)))
 351
 352 (defun gnus-bookmark-maybe-sort-alist ()
 353   "Return the gnus-bookmark-alist for display.
 354 If the gnus-bookmark-sort-flag is non-nil, then return a sorted
 355 copy of the alist."
 356   (when gnus-bookmark-sort-flag
 357     (setq gnus-bookmark-alist
 358           (sort (copy-alist gnus-bookmark-alist)
 359                 (function
 360                  (lambda (x y) (string-lessp (car x) (car y))))))))
 361
 362 ;;;###autoload
 363 (defun gnus-bookmark-bmenu-list ()
 364   "Display a list of existing Gnus bookmarks.
 365 The list is displayed in a buffer named `*Gnus Bookmark List*'.
 366 The leftmost column displays a D if the bookmark is flagged for
 367 deletion, or > if it is flagged for displaying."
 368   (interactive)
 369   (gnus-bookmark-maybe-load-default-file)
 370   (if (gmm-called-interactively-p 'any)
 371       (switch-to-buffer (get-buffer-create "*Gnus Bookmark List*"))
 372     (set-buffer (get-buffer-create "*Gnus Bookmark List*")))
 373   (let ((inhibit-read-only t)
 374         alist name start end)
 375     (erase-buffer)
 376     (insert "% Gnus Bookmark\n- --------\n")
 377     (add-text-properties (point-min) (point)
 378                          '(font-lock-face gnus-bookmark-menu-heading))
 379     ;; sort before displaying
 380     (gnus-bookmark-maybe-sort-alist)
 381     ;; Display gnus bookmarks
 382     (setq alist gnus-bookmark-alist)
 383     (while alist
 384       (setq name (gnus-bookmark-name-from-full-record (pop alist)))
 385       ;; if a Gnus bookmark has an annotation, prepend a "*"
 386       ;; in the list of bookmarks.
 387       (insert (if (member (gnus-bookmark-get-annotation name) (list nil ""))
 388                   "  "
 389                 " *"))
 390       (if (gnus-bookmark-mouse-available-p)
 391           (add-text-properties
 392            (prog1
 393                (point)
 394              (insert name))
 395            (let ((end (point)))
 396              (prog2
 397                  (re-search-backward "[^ \t]")
 398                  (1+ (point))
 399                (goto-char end)
 400                (insert "\n")))
 401            `(mouse-face highlight follow-link t
 402                         help-echo ,(format "%s: go to this article"
 403                                            (aref gnus-mouse-2 0))))
 404         (insert name "\n")))
 405     (goto-char (point-min))
 406     (forward-line 2)
 407     (gnus-bookmark-bmenu-mode)
 408     (if gnus-bookmark-bmenu-toggle-infos
 409         (gnus-bookmark-bmenu-toggle-infos t))))
 410
 411 (defun gnus-bookmark-bmenu-surreptitiously-rebuild-list ()
 412   "Rebuild the Bookmark List if it exists.
 413 Don't affect the buffer ring order."
 414   (if (get-buffer "*Gnus Bookmark List*")
 415       (save-excursion
 416         (save-window-excursion
 417           (gnus-bookmark-bmenu-list)))))
 418
 419 (defun gnus-bookmark-get-annotation (bookmark)
 420   "Return the annotation of Gnus BOOKMARK, or nil if none."
 421   (cdr (assq 'annotation (gnus-bookmark-get-bookmark-record bookmark))))
 422
 423 (defun gnus-bookmark-get-bookmark (bookmark)
 424   "Return the full entry for Gnus BOOKMARK in `gnus-bookmark-alist'.
 425 If BOOKMARK is not a string, return nil."
 426   (when (stringp bookmark)
 427     (assoc bookmark gnus-bookmark-alist)))
 428
 429 (defun gnus-bookmark-get-bookmark-record (bookmark)
 430   "Return the guts of the entry for Gnus BOOKMARK in `gnus-bookmark-alist'.
 431 That is, all information but the name."
 432   (car (cdr (gnus-bookmark-get-bookmark bookmark))))
 433
 434 (defun gnus-bookmark-name-from-full-record (full-record)
 435   "Return name of FULL-RECORD \(an alist element instead of a string\)."
 436   (car full-record))
 437
 438 (defvar gnus-bookmark-bmenu-bookmark-column nil)
 439 (defvar gnus-bookmark-bmenu-hidden-bookmarks ())
 440 (defvar gnus-bookmark-bmenu-mode-map nil)
 441
 442 (if gnus-bookmark-bmenu-mode-map
 443     nil
 444   (setq gnus-bookmark-bmenu-mode-map (make-keymap))
 445   (suppress-keymap gnus-bookmark-bmenu-mode-map t)
 446   (define-key gnus-bookmark-bmenu-mode-map "q" (if (fboundp 'quit-window)
 447                                                    'quit-window
 448                                                  'bury-buffer))
 449   (define-key gnus-bookmark-bmenu-mode-map "\C-m" 'gnus-bookmark-bmenu-select)
 450   (define-key gnus-bookmark-bmenu-mode-map "v" 'gnus-bookmark-bmenu-select)
 451   (define-key gnus-bookmark-bmenu-mode-map "d" 'gnus-bookmark-bmenu-delete)
 452   (define-key gnus-bookmark-bmenu-mode-map "k" 'gnus-bookmark-bmenu-delete)
 453   (define-key gnus-bookmark-bmenu-mode-map "\C-d" 'gnus-bookmark-bmenu-delete-backwards)
 454   (define-key gnus-bookmark-bmenu-mode-map "x" 'gnus-bookmark-bmenu-execute-deletions)
 455   (define-key gnus-bookmark-bmenu-mode-map " " 'next-line)
 456   (define-key gnus-bookmark-bmenu-mode-map "n" 'next-line)
 457   (define-key gnus-bookmark-bmenu-mode-map "p" 'previous-line)
 458   (define-key gnus-bookmark-bmenu-mode-map "\177" 'gnus-bookmark-bmenu-backup-unmark)
 459   (define-key gnus-bookmark-bmenu-mode-map "?" 'describe-mode)
 460   (define-key gnus-bookmark-bmenu-mode-map "u" 'gnus-bookmark-bmenu-unmark)
 461   (define-key gnus-bookmark-bmenu-mode-map "m" 'gnus-bookmark-bmenu-mark)
 462   (define-key gnus-bookmark-bmenu-mode-map "l" 'gnus-bookmark-bmenu-load)
 463   (define-key gnus-bookmark-bmenu-mode-map "s" 'gnus-bookmark-bmenu-save)
 464   (define-key gnus-bookmark-bmenu-mode-map "t" 'gnus-bookmark-bmenu-toggle-infos)
 465   (define-key gnus-bookmark-bmenu-mode-map "a" 'gnus-bookmark-bmenu-show-details)
 466   (define-key gnus-bookmark-bmenu-mode-map gnus-mouse-2
 467     'gnus-bookmark-bmenu-select-by-mouse))
 468
 469 ;; Bookmark Buffer Menu mode is suitable only for specially formatted
 470 ;; data.
 471 (put 'gnus-bookmark-bmenu-mode 'mode-class 'special)
 472
 473 ;; Been to lazy to use gnus-bookmark-save...
 474 (defalias 'gnus-bookmark-bmenu-save 'gnus-bookmark-write-file)
 475
 476 (define-derived-mode gnus-bookmark-bmenu-mode fundamental-mode "Bookmark Menu"
 477   "Major mode for editing a list of Gnus bookmarks.
 478 Each line describes one of the bookmarks in Gnus.
 479 Letters do not insert themselves; instead, they are commands.
 480 Gnus bookmarks names preceded by a \"*\" have annotations.
 481 \\<gnus-bookmark-bmenu-mode-map>
 482 \\[gnus-bookmark-bmenu-mark] -- mark bookmark to be displayed.
 483 \\[gnus-bookmark-bmenu-select] -- select bookmark of line point is on.
 484   Also show bookmarks marked using m in other windows.
 485 \\[gnus-bookmark-bmenu-toggle-infos] -- toggle displaying of details (they may obscure long bookmark names).
 486 \\[gnus-bookmark-bmenu-locate] -- display (in minibuffer) location of this bookmark.
 487 \\[gnus-bookmark-bmenu-rename] -- rename this bookmark \(prompts for new name\).
 488 \\[gnus-bookmark-bmenu-delete] -- mark this bookmark to be deleted, and move down.
 489 \\[gnus-bookmark-bmenu-delete-backwards] -- mark this bookmark to be deleted, and move up.
 490 \\[gnus-bookmark-bmenu-execute-deletions] -- delete bookmarks marked with `\\[gnus-bookmark-bmenu-delete]'.
 491 \\[gnus-bookmark-bmenu-load] -- load in a file of bookmarks (prompts for file.)
 492 \\[gnus-bookmark-bmenu-save] -- load in a file of bookmarks (prompts for file.)
 493 \\[gnus-bookmark-bmenu-unmark] -- remove all kinds of marks from current line.
 494   With prefix argument, also move up one line.
 495 \\[gnus-bookmark-bmenu-backup-unmark] -- back up a line and remove marks.
 496 \\[gnus-bookmark-bmenu-show-details] -- show the annotation, if it exists, for the current bookmark
 497   in another buffer.
 498 \\[gnus-bookmark-bmenu-show-all-annotations] -- show the annotations of all bookmarks in another buffer.
 499 \\[gnus-bookmark-bmenu-edit-annotation] -- edit the annotation for the current bookmark."
 500   (setq truncate-lines t)
 501   (setq buffer-read-only t))
 502
 503 ;; avoid compilation warnings
 504 (defvar gnus-bookmark-bmenu-toggle-infos nil)
 505
 506 (defun gnus-bookmark-bmenu-toggle-infos (&optional show)
 507   "Toggle whether details are shown in the Gnus bookmark list.
 508 Optional argument SHOW means show them unconditionally."
 509   (interactive)
 510   (cond
 511    (show
 512     (setq gnus-bookmark-bmenu-toggle-infos nil)
 513     (gnus-bookmark-bmenu-show-infos)
 514     (setq gnus-bookmark-bmenu-toggle-infos t))
 515    (gnus-bookmark-bmenu-toggle-infos
 516     (gnus-bookmark-bmenu-hide-infos)
 517     (setq gnus-bookmark-bmenu-toggle-infos nil))
 518    (t
 519     (gnus-bookmark-bmenu-show-infos)
 520     (setq gnus-bookmark-bmenu-toggle-infos t))))
 521
 522 (defun gnus-bookmark-bmenu-show-infos (&optional force)
 523   "Show infos in bmenu, maybe FORCE display of infos."
 524   (if (and (not force) gnus-bookmark-bmenu-toggle-infos)
 525       nil ;already shown, so do nothing
 526     (save-excursion
 527       (save-window-excursion
 528         (goto-char (point-min))
 529         (forward-line 2)
 530         (setq gnus-bookmark-bmenu-hidden-bookmarks ())
 531         (let ((inhibit-read-only t))
 532           (while (< (point) (point-max))
 533             (let ((bmrk (gnus-bookmark-bmenu-bookmark)))
 534               (setq gnus-bookmark-bmenu-hidden-bookmarks
 535                     (cons bmrk gnus-bookmark-bmenu-hidden-bookmarks))
 536               (let ((start (point-at-eol)))
 537                 (move-to-column gnus-bookmark-bmenu-file-column t)
 538                 ;; Strip off `mouse-face' from the white spaces region.
 539                 (if (gnus-bookmark-mouse-available-p)
 540                     (remove-text-properties start (point)
 541                                             '(mouse-face nil help-echo nil))))
 542               (delete-region (point) (progn (end-of-line) (point)))
 543               (insert "  ")
 544               ;; Pass the NO-HISTORY arg:
 545               (gnus-bookmark-insert-details bmrk)
 546               (forward-line 1))))))))
 547
 548 (defun gnus-bookmark-insert-details (bmk-name)
 549   "Insert the details of the article associated with BMK-NAME."
 550   (let ((start (point)))
 551     (prog1
 552         (insert (gnus-bookmark-get-details
 553                  bmk-name
 554                  gnus-bookmark-bookmark-inline-details))
 555       (if (gnus-bookmark-mouse-available-p)
 556           (add-text-properties
 557            start
 558            (save-excursion (re-search-backward
 559                             "[^ \t]")
 560                                                (1+ (point)))
 561            `(mouse-face highlight
 562              follow-link t
 563              help-echo ,(format "%s: go to this article"
 564                                 (aref gnus-mouse-2 0))))))))
 565
 566 (defun gnus-bookmark-kill-line (&optional newline-too)
 567   "Kill from point to end of line.
 568 If optional arg NEWLINE-TOO is non-nil, delete the newline too.
 569 Does not affect the kill ring."
 570   (delete-region (point) (point-at-eol))
 571   (if (and newline-too (looking-at "\n"))
 572       (delete-char 1)))
 573
 574 (defun gnus-bookmark-get-details (bmk-name details-list)
 575   "Get details for a Gnus BMK-NAME depending on DETAILS-LIST."
 576   (let ((details (cadr (assoc bmk-name gnus-bookmark-alist))))
 577     (mapconcat
 578      (lambda (info)
 579        (cdr (assoc info details)))
 580      details-list " | ")))
 581
 582 (defun gnus-bookmark-bmenu-hide-infos (&optional force)
 583   "Hide infos in bmenu, maybe FORCE."
 584   (if (and (not force) gnus-bookmark-bmenu-toggle-infos)
 585       ;; nothing to hide if above is nil
 586       (save-excursion
 587         (save-window-excursion
 588           (goto-char (point-min))
 589           (forward-line 2)
 590           (setq gnus-bookmark-bmenu-hidden-bookmarks
 591                 (nreverse gnus-bookmark-bmenu-hidden-bookmarks))
 592           (save-excursion
 593             (goto-char (point-min))
 594             (search-forward "Gnus Bookmark")
 595             (backward-word 2)
 596             (setq gnus-bookmark-bmenu-bookmark-column (current-column)))
 597           (save-excursion
 598             (let ((inhibit-read-only t))
 599               (while gnus-bookmark-bmenu-hidden-bookmarks
 600                 (move-to-column gnus-bookmark-bmenu-bookmark-column t)
 601                 (gnus-bookmark-kill-line)
 602                 (let ((start (point)))
 603                   (insert (car gnus-bookmark-bmenu-hidden-bookmarks))
 604                   (if (gnus-bookmark-mouse-available-p)
 605                       (add-text-properties
 606                        start
 607                        (save-excursion (re-search-backward
 608                                         "[^ \t]")
 609                                        (1+ (point)))
 610                        `(mouse-face highlight
 611                          follow-link t
 612                          help-echo
 613                          ,(format "%s: go to this bookmark in other window"
 614                                   (aref gnus-mouse-2 0))))))
 615                 (setq gnus-bookmark-bmenu-hidden-bookmarks
 616                       (cdr gnus-bookmark-bmenu-hidden-bookmarks))
 617                 (forward-line 1))))))))
 618
 619 (defun gnus-bookmark-bmenu-check-position ()
 620   "Return non-nil if on a line with a bookmark.
 621 The actual value returned is gnus-bookmark-alist.  Else
 622 reposition and try again, else return nil."
 623   (cond ((< (count-lines (point-min) (point)) 2)
 624          (goto-char (point-min))
 625          (forward-line 2)
 626          gnus-bookmark-alist)
 627         ((and (bolp) (eobp))
 628          (beginning-of-line 0)
 629          gnus-bookmark-alist)
 630         (t
 631          gnus-bookmark-alist)))
 632
 633 (defun gnus-bookmark-bmenu-bookmark ()
 634   "Return a string which is bookmark of this line."
 635   (if (gnus-bookmark-bmenu-check-position)
 636       (save-excursion
 637         (save-window-excursion
 638           (goto-char (point-min))
 639           (search-forward "Gnus Bookmark")
 640           (backward-word 2)
 641           (setq gnus-bookmark-bmenu-bookmark-column (current-column)))))
 642   (if gnus-bookmark-bmenu-toggle-infos
 643       (gnus-bookmark-bmenu-hide-infos))
 644   (save-excursion
 645     (save-window-excursion
 646       (beginning-of-line)
 647       (forward-char gnus-bookmark-bmenu-bookmark-column)
 648       (prog1
 649           (buffer-substring-no-properties (point)
 650                             (progn
 651                               (end-of-line)
 652                               (point)))
 653         ;; well, this is certainly crystal-clear:
 654         (if gnus-bookmark-bmenu-toggle-infos
 655             (gnus-bookmark-bmenu-toggle-infos t))))))
 656
 657 (defun gnus-bookmark-show-details (bookmark)
 658   "Display the annotation for BOOKMARK in a buffer."
 659   (let ((record (gnus-bookmark-get-bookmark-record bookmark))
 660         (old-buf (current-buffer))
 661         (details gnus-bookmark-bookmark-details)
 662         detail)
 663     (save-excursion
 664       (pop-to-buffer (get-buffer-create "*Gnus Bookmark Annotation*") t)
 665       (erase-buffer)
 666       (while details
 667         (setq detail (pop details))
 668         (unless (equal (cdr (assoc detail record)) "")
 669           (insert (symbol-name detail) ": " (cdr (assoc detail record)) "\n")))
 670       (goto-char (point-min))
 671       (pop-to-buffer old-buf))))
 672
 673 (defun gnus-bookmark-bmenu-show-details ()
 674   "Show the annotation for the current bookmark in another window."
 675   (interactive)
 676   (let ((bookmark (gnus-bookmark-bmenu-bookmark)))
 677     (if (gnus-bookmark-bmenu-check-position)
 678         (gnus-bookmark-show-details bookmark))))
 679
 680 (defun gnus-bookmark-bmenu-mark ()
 681   "Mark bookmark on this line to be displayed by \\<gnus-bookmark-bmenu-mode-map>\\[gnus-bookmark-bmenu-select]."
 682   (interactive)
 683   (beginning-of-line)
 684   (if (gnus-bookmark-bmenu-check-position)
 685       (let ((inhibit-read-only t))
 686         (delete-char 1)
 687         (insert ?>)
 688         (forward-line 1)
 689         (gnus-bookmark-bmenu-check-position))))
 690
 691 (defun gnus-bookmark-bmenu-unmark (&optional backup)
 692   "Cancel all requested operations on bookmark on this line and move down.
 693 Optional BACKUP means move up."
 694   (interactive "P")
 695   (beginning-of-line)
 696   (if (gnus-bookmark-bmenu-check-position)
 697       (progn
 698         (let ((inhibit-read-only t))
 699           (delete-char 1)
 700           ;; any flags to reset according to circumstances?  How about a
 701           ;; flag indicating whether this bookmark is being visited?
 702           ;; well, we don't have this now, so maybe later.
 703           (insert " "))
 704         (forward-line (if backup -1 1))
 705         (gnus-bookmark-bmenu-check-position))))
 706
 707 (defun gnus-bookmark-bmenu-backup-unmark ()
 708   "Move up and cancel all requested operations on bookmark on line above."
 709   (interactive)
 710   (forward-line -1)
 711   (if (gnus-bookmark-bmenu-check-position)
 712       (progn
 713         (gnus-bookmark-bmenu-unmark)
 714         (forward-line -1)
 715         (gnus-bookmark-bmenu-check-position))))
 716
 717 (defun gnus-bookmark-bmenu-delete ()
 718   "Mark Gnus bookmark on this line to be deleted.
 719 To carry out the deletions that you've marked, use
 720 \\<gnus-bookmark-bmenu-mode-map>\\[gnus-bookmark-bmenu-execute-deletions]."
 721   (interactive)
 722   (beginning-of-line)
 723   (if (gnus-bookmark-bmenu-check-position)
 724       (let ((inhibit-read-only t))
 725         (delete-char 1)
 726         (insert ?D)
 727         (forward-line 1)
 728         (gnus-bookmark-bmenu-check-position))))
 729
 730 (defun gnus-bookmark-bmenu-delete-backwards ()
 731   "Mark bookmark on this line to be deleted, then move up one line.
 732 To carry out the deletions that you've marked, use
 733 \\<gnus-bookmark-bmenu-mode-map>\\[gnus-bookmark-bmenu-execute-deletions]."
 734   (interactive)
 735   (gnus-bookmark-bmenu-delete)
 736   (forward-line -2)
 737   (if (gnus-bookmark-bmenu-check-position)
 738       (forward-line 1))
 739   (gnus-bookmark-bmenu-check-position))
 740
 741 (defun gnus-bookmark-bmenu-select ()
 742   "Select this line's bookmark; also display bookmarks marked with `>'.
 743 You can mark bookmarks with the
 744 \\<gnus-bookmark-bmenu-mode-map>\\[gnus-bookmark-bmenu-mark]
 745 command."
 746   (interactive)
 747   (if (gnus-bookmark-bmenu-check-position)
 748       (let ((bmrk (gnus-bookmark-bmenu-bookmark))
 749             (menu (current-buffer)))
 750         (goto-char (point-min))
 751         (delete-other-windows)
 752         (gnus-bookmark-jump bmrk)
 753         (bury-buffer menu))))
 754
 755 (defun gnus-bookmark-bmenu-select-by-mouse (event)
 756   (interactive "e")
 757   (mouse-set-point event)
 758   (gnus-bookmark-bmenu-select))
 759
 760 (defun gnus-bookmark-bmenu-load ()
 761   "Load the Gnus bookmark file and rebuild the bookmark menu-buffer."
 762   (interactive)
 763   (if (gnus-bookmark-bmenu-check-position)
 764       (save-excursion
 765         (save-window-excursion
 766           ;; This will call `gnus-bookmark-bmenu-list'
 767           (call-interactively 'gnus-bookmark-load)))))
 768
 769 (defun gnus-bookmark-bmenu-execute-deletions ()
 770   "Delete Gnus bookmarks marked with \\<Buffer-menu-mode-map>\\[Buffer-menu-delete] commands."
 771   (interactive)
 772   (message "Deleting Gnus bookmarks...")
 773   (let ((hide-em gnus-bookmark-bmenu-toggle-infos)
 774         (o-point  (point))
 775         (o-str    (save-excursion
 776                     (beginning-of-line)
 777                     (if (looking-at "^D")
 778                         nil
 779                       (buffer-substring
 780                        (point)
 781                        (progn (end-of-line) (point))))))
 782         (o-col     (current-column)))
 783     (if hide-em (gnus-bookmark-bmenu-hide-infos))
 784     (setq gnus-bookmark-bmenu-toggle-infos nil)
 785     (goto-char (point-min))
 786     (forward-line 1)
 787     (while (re-search-forward "^D" (point-max) t)
 788       (gnus-bookmark-delete (gnus-bookmark-bmenu-bookmark) t)) ; pass BATCH arg
 789     (gnus-bookmark-bmenu-list)
 790     (setq gnus-bookmark-bmenu-toggle-infos hide-em)
 791     (if gnus-bookmark-bmenu-toggle-infos
 792         (gnus-bookmark-bmenu-toggle-infos t))
 793     (if o-str
 794         (progn
 795           (goto-char (point-min))
 796           (search-forward o-str)
 797           (beginning-of-line)
 798           (forward-char o-col))
 799       (goto-char o-point))
 800     (beginning-of-line)
 801     (gnus-bookmark-write-file)
 802     (message "Deleting bookmarks...done")))
 803
 804 (defun gnus-bookmark-delete (bookmark &optional batch)
 805   "Delete BOOKMARK from the bookmark list.
 806 Removes only the first instance of a bookmark with that name.  If
 807 there are one or more other bookmarks with the same name, they will
 808 not be deleted.  Defaults to the \"current\" bookmark \(that is, the
 809 one most recently used in this file, if any\).
 810 Optional second arg BATCH means don't update the bookmark list buffer,
 811 probably because we were called from there."
 812   (gnus-bookmark-maybe-load-default-file)
 813   (let ((will-go (gnus-bookmark-get-bookmark bookmark)))
 814     (setq gnus-bookmark-alist (delq will-go gnus-bookmark-alist)))
 815   ;; Don't rebuild the list
 816   (if batch
 817       nil
 818     (gnus-bookmark-bmenu-surreptitiously-rebuild-list)))
 819
 820 (provide 'gnus-bookmark)
 821
 822 ;;; gnus-bookmark.el ends here