lisp/gnus/gnus-salt.el

   1 ;;; gnus-salt.el --- alternate summary mode interfaces for Gnus
   2
   3 ;; Copyright (C) 1996-1999, 2001-2015 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.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 ;;; Code:
  26
  27 (eval-when-compile (require 'cl))
  28 (eval-when-compile
  29   (when (featurep 'xemacs)
  30     (require 'easy-mmode))) ; for `define-minor-mode'
  31
  32 (require 'gnus)
  33 (require 'gnus-sum)
  34 (require 'gnus-win)
  35
  36 ;;;
  37 ;;; gnus-pick-mode
  38 ;;;
  39
  40 (defcustom gnus-pick-display-summary nil
  41   "*Display summary while reading."
  42   :type 'boolean
  43   :group 'gnus-summary-pick)
  44
  45 (defcustom gnus-pick-mode-hook nil
  46   "Hook run in summary pick mode buffers."
  47   :type 'hook
  48   :group 'gnus-summary-pick)
  49
  50 (when (featurep 'xemacs)
  51   (add-hook 'gnus-pick-mode-hook 'gnus-xmas-pick-menu-add))
  52
  53 (defcustom gnus-mark-unpicked-articles-as-read nil
  54   "*If non-nil, mark all unpicked articles as read."
  55   :type 'boolean
  56   :group 'gnus-summary-pick)
  57
  58 (defcustom gnus-pick-elegant-flow t
  59   "If non-nil, `gnus-pick-start-reading' runs
  60  `gnus-summary-next-group' when no articles have been picked."
  61   :type 'boolean
  62   :group 'gnus-summary-pick)
  63
  64 (defcustom gnus-summary-pick-line-format
  65   "%-5P %U\%R\%z\%I\%(%[%4L: %-23,23n%]%) %s\n"
  66   "*The format specification of the lines in pick buffers.
  67 It accepts the same format specs that `gnus-summary-line-format' does."
  68   :type 'string
  69   :group 'gnus-summary-pick)
  70
  71 ;;; Internal variables.
  72
  73 (defvar gnus-pick-mode-map
  74   (let ((map (make-sparse-keymap)))
  75     (gnus-define-keys map
  76       " " gnus-pick-next-page
  77       "u" gnus-pick-unmark-article-or-thread
  78       "." gnus-pick-article-or-thread
  79       gnus-down-mouse-2 gnus-pick-mouse-pick-region
  80       "\r" gnus-pick-start-reading)
  81     map))
  82
  83 (defun gnus-pick-make-menu-bar ()
  84   (unless (boundp 'gnus-pick-menu)
  85     (easy-menu-define
  86       gnus-pick-menu gnus-pick-mode-map ""
  87       '("Pick"
  88         ("Pick"
  89          ["Article" gnus-summary-mark-as-processable t]
  90          ["Thread" gnus-uu-mark-thread t]
  91          ["Region" gnus-uu-mark-region t]
  92          ["Regexp" gnus-uu-mark-by-regexp t]
  93          ["Buffer" gnus-uu-mark-buffer t])
  94         ("Unpick"
  95          ["Article" gnus-summary-unmark-as-processable t]
  96          ["Thread" gnus-uu-unmark-thread t]
  97          ["Region" gnus-uu-unmark-region t]
  98          ["Regexp" gnus-uu-unmark-by-regexp t]
  99          ["Buffer" gnus-summary-unmark-all-processable t])
 100         ["Start reading" gnus-pick-start-reading t]
 101         ["Switch pick mode off" gnus-pick-mode gnus-pick-mode]))))
 102
 103 (eval-when-compile
 104   (when (featurep 'xemacs)
 105     (defvar gnus-pick-mode-on-hook)
 106     (defvar gnus-pick-mode-off-hook)))
 107
 108 (define-minor-mode gnus-pick-mode
 109   "Minor mode for providing a pick-and-read interface in Gnus summary buffers.
 110
 111 \\{gnus-pick-mode-map}"
 112   :lighter " Pick" :keymap gnus-pick-mode-map
 113   (cond
 114    ((not (derived-mode-p 'gnus-summary-mode)) (setq gnus-pick-mode nil))
 115    ((not gnus-pick-mode)
 116     ;; FIXME: a buffer-local minor mode removing globally from a hook??
 117     (remove-hook 'gnus-message-setup-hook 'gnus-pick-setup-message))
 118    (t
 119     ;; Make sure that we don't select any articles upon group entry.
 120     (set (make-local-variable 'gnus-auto-select-first) nil)
 121     ;; Change line format.
 122     (setq gnus-summary-line-format gnus-summary-pick-line-format)
 123     (setq gnus-summary-line-format-spec nil)
 124     (gnus-update-format-specifications nil 'summary)
 125     (gnus-update-summary-mark-positions)
 126     ;; FIXME: a buffer-local minor mode adding globally to a hook??
 127     (add-hook 'gnus-message-setup-hook 'gnus-pick-setup-message)
 128     (set (make-local-variable 'gnus-summary-goto-unread) 'never)
 129     ;; Set up the menu.
 130     (when (gnus-visual-p 'pick-menu 'menu)
 131       (gnus-pick-make-menu-bar)))))
 132
 133 (defun gnus-pick-setup-message ()
 134   "Make Message do the right thing on exit."
 135   (when (and (gnus-buffer-live-p gnus-summary-buffer)
 136              (with-current-buffer gnus-summary-buffer
 137                gnus-pick-mode))
 138     (message-add-action
 139      `(gnus-configure-windows ,gnus-current-window-configuration t)
 140      'send 'exit 'postpone 'kill)))
 141
 142 (defvar gnus-pick-line-number 1)
 143 (defun gnus-pick-line-number ()
 144   "Return the current line number."
 145   (if (bobp)
 146       (setq gnus-pick-line-number 1)
 147     (incf gnus-pick-line-number)))
 148
 149 (defun gnus-pick-start-reading (&optional catch-up)
 150   "Start reading the picked articles.
 151 If given a prefix, mark all unpicked articles as read."
 152   (interactive "P")
 153   (if gnus-newsgroup-processable
 154       (progn
 155         (gnus-summary-limit-to-articles nil)
 156         (when (or catch-up gnus-mark-unpicked-articles-as-read)
 157           (gnus-summary-limit-mark-excluded-as-read))
 158         (gnus-summary-first-article)
 159         (gnus-configure-windows
 160          (if gnus-pick-display-summary 'article 'pick) t))
 161     (if gnus-pick-elegant-flow
 162         (progn
 163           (when (or catch-up gnus-mark-unpicked-articles-as-read)
 164             (gnus-summary-catchup nil t))
 165           (if (gnus-group-quit-config gnus-newsgroup-name)
 166               (gnus-summary-exit)
 167             (gnus-summary-next-group)))
 168       (error "No articles have been picked"))))
 169
 170 (defun gnus-pick-goto-article (arg)
 171   "Go to the article number indicated by ARG.
 172 If ARG is an invalid article number, then stay on current line."
 173   (let (pos)
 174     (save-excursion
 175       (goto-char (point-min))
 176       (when (zerop (forward-line (1- (prefix-numeric-value arg))))
 177         (setq pos (point))))
 178     (if (not pos)
 179         (gnus-error 2 "No such line: %s" arg)
 180       (goto-char pos))))
 181
 182 (defun gnus-pick-article (&optional arg)
 183   "Pick the article on the current line.
 184 If ARG, pick the article on that line instead."
 185   (interactive "P")
 186   (when arg
 187     (gnus-pick-goto-article arg))
 188   (gnus-summary-mark-as-processable 1))
 189
 190 (defun gnus-pick-article-or-thread (&optional arg)
 191   "If `gnus-thread-hide-subtree' is t, then pick the thread on the current line.
 192 Otherwise pick the article on the current line.
 193 If ARG, pick the article/thread on that line instead."
 194   (interactive "P")
 195   (when arg
 196     (gnus-pick-goto-article arg))
 197   (if gnus-thread-hide-subtree
 198       (progn
 199         (save-excursion
 200           (gnus-uu-mark-thread))
 201         (forward-line 1))
 202     (gnus-summary-mark-as-processable 1)))
 203
 204 (defun gnus-pick-unmark-article-or-thread (&optional arg)
 205   "If `gnus-thread-hide-subtree' is t, then unmark the thread on current line.
 206 Otherwise unmark the article on current line.
 207 If ARG, unmark thread/article on that line instead."
 208   (interactive "P")
 209   (when arg
 210     (gnus-pick-goto-article arg))
 211   (if gnus-thread-hide-subtree
 212       (save-excursion
 213         (gnus-uu-unmark-thread))
 214     (gnus-summary-unmark-as-processable 1)))
 215
 216 (defun gnus-pick-mouse-pick (e)
 217   (interactive "e")
 218   (mouse-set-point e)
 219   (save-excursion
 220     (gnus-summary-mark-as-processable 1)))
 221
 222 (defun gnus-pick-mouse-pick-region (start-event)
 223   "Pick articles that the mouse is dragged over.
 224 This must be bound to a button-down mouse event."
 225   (interactive "e")
 226   (mouse-minibuffer-check start-event)
 227   (let* ((echo-keystrokes 0)
 228          (start-posn (event-start start-event))
 229          (start-point (posn-point start-posn))
 230          (start-line (1+ (count-lines (point-min) start-point)))
 231          (start-window (posn-window start-posn))
 232          (bounds (gnus-window-edges start-window))
 233          (top (nth 1 bounds))
 234          (bottom (if (window-minibuffer-p start-window)
 235                      (nth 3 bounds)
 236                    ;; Don't count the mode line.
 237                    (1- (nth 3 bounds))))
 238          (click-count (1- (event-click-count start-event))))
 239     (setq mouse-selection-click-count click-count)
 240     (setq mouse-selection-click-count-buffer (current-buffer))
 241     (mouse-set-point start-event)
 242    ;; In case the down click is in the middle of some intangible text,
 243     ;; use the end of that text, and put it in START-POINT.
 244     (when (< (point) start-point)
 245       (goto-char start-point))
 246     (gnus-pick-article)
 247     (setq start-point (point))
 248     ;; end-of-range is used only in the single-click case.
 249     ;; It is the place where the drag has reached so far
 250     ;; (but not outside the window where the drag started).
 251     (let (event end end-point (end-of-range (point)))
 252       (track-mouse
 253         (while (progn
 254                  (setq event (cdr (gnus-read-event-char)))
 255                  (or (mouse-movement-p event)
 256                      (eq (car-safe event) 'switch-frame)))
 257           (if (eq (car-safe event) 'switch-frame)
 258               nil
 259             (setq end (event-end event)
 260                   end-point (posn-point end))
 261
 262             (cond
 263              ;; Are we moving within the original window?
 264              ((and (eq (posn-window end) start-window)
 265                    (integer-or-marker-p end-point))
 266               ;; Go to START-POINT first, so that when we move to END-POINT,
 267               ;; if it's in the middle of intangible text,
 268               ;; point jumps in the direction away from START-POINT.
 269               (goto-char start-point)
 270               (goto-char end-point)
 271               (gnus-pick-article)
 272               ;; In case the user moved his mouse really fast, pick
 273               ;; articles on the line between this one and the last one.
 274               (let* ((this-line (1+ (count-lines (point-min) end-point)))
 275                      (min-line (min this-line start-line))
 276                      (max-line (max this-line start-line)))
 277                 (while (< min-line max-line)
 278                   (goto-char (point-min))
 279                   (forward-line (1- min-line))
 280                   (gnus-pick-article)
 281                   (setq min-line (1+ min-line)))
 282                 (setq start-line this-line))
 283               (when (zerop (% click-count 3))
 284                 (setq end-of-range (point))))
 285              (t
 286               (let ((mouse-row (cdr (cdr (mouse-position)))))
 287                 (cond
 288                  ((null mouse-row))
 289                  ((< mouse-row top)
 290                   (mouse-scroll-subr start-window (- mouse-row top)))
 291                  ((>= mouse-row bottom)
 292                   (mouse-scroll-subr start-window
 293                                      (1+ (- mouse-row bottom)))))))))))
 294       (when (consp event)
 295         (let (;; (fun (key-binding (vector (car event))))
 296               )
 297           ;; Run the binding of the terminating up-event, if possible.
 298           ;; In the case of a multiple click, it gives the wrong results,
 299           ;; because it would fail to set up a region.
 300           (when nil
 301             ;; (and (= (mod mouse-selection-click-count 3) 0) (fboundp fun))
 302             ;; In this case, we can just let the up-event execute normally.
 303             (let ((end (event-end event)))
 304               ;; Set the position in the event before we replay it,
 305               ;; because otherwise it may have a position in the wrong
 306               ;; buffer.
 307               (setcar (cdr end) end-of-range)
 308               ;; Delete the overlay before calling the function,
 309               ;; because delete-overlay increases buffer-modified-tick.
 310               (push event unread-command-events))))))))
 311
 312 (defvar scroll-in-place)
 313
 314 (defun gnus-pick-next-page ()
 315   "Go to the next page.  If at the end of the buffer, start reading articles."
 316   (interactive)
 317   (let ((scroll-in-place nil))
 318     (condition-case nil
 319         (scroll-up)
 320       (end-of-buffer (gnus-pick-start-reading)))))
 321
 322 ;;;
 323 ;;; gnus-binary-mode
 324 ;;;
 325
 326 (defvar gnus-binary-mode-hook nil
 327   "Hook run in summary binary mode buffers.")
 328
 329 (defvar gnus-binary-mode-map
 330   (let ((map (make-sparse-keymap)))
 331     (gnus-define-keys map
 332       "g" gnus-binary-show-article)
 333     map))
 334
 335 (defun gnus-binary-make-menu-bar ()
 336   (unless (boundp 'gnus-binary-menu)
 337     (easy-menu-define
 338       gnus-binary-menu gnus-binary-mode-map ""
 339       '("Pick"
 340         ["Switch binary mode off" gnus-binary-mode t]))))
 341
 342 (eval-when-compile
 343   (when (featurep 'xemacs)
 344     (defvar gnus-binary-mode-on-hook)
 345     (defvar gnus-binary-mode-off-hook)))
 346
 347 (define-minor-mode gnus-binary-mode
 348   "Minor mode for providing a binary group interface in Gnus summary buffers."
 349   :lighter " Binary" :keymap gnus-binary-mode-map
 350   (cond
 351    ((not (derived-mode-p 'gnus-summary-mode)) (setq gnus-binary-mode nil))
 352    (gnus-binary-mode
 353     ;; Make sure that we don't select any articles upon group entry.
 354     (make-local-variable 'gnus-auto-select-first)
 355     (setq gnus-auto-select-first nil)
 356     (make-local-variable 'gnus-summary-display-article-function)
 357     (setq gnus-summary-display-article-function 'gnus-binary-display-article)
 358     ;; Set up the menu.
 359     (when (gnus-visual-p 'binary-menu 'menu)
 360       (gnus-binary-make-menu-bar)))))
 361
 362 (defun gnus-binary-display-article (article &optional _all-header)
 363   "Run ARTICLE through the binary decode functions."
 364   (when (gnus-summary-goto-subject article)
 365     (let ((gnus-view-pseudos (or gnus-view-pseudos 'automatic)))
 366       (gnus-uu-decode-uu))))
 367
 368 (defun gnus-binary-show-article (&optional arg)
 369   "Bypass the binary functions and show the article."
 370   (interactive "P")
 371   (let (gnus-summary-display-article-function)
 372     (gnus-summary-show-article arg)))
 373
 374 ;;;
 375 ;;; gnus-tree-mode
 376 ;;;
 377
 378 (defcustom gnus-tree-line-format "%(%[%3,3n%]%)"
 379   "Format of tree elements."
 380   :type 'string
 381   :group 'gnus-summary-tree)
 382
 383 (defcustom gnus-tree-minimize-window t
 384   "If non-nil, minimize the tree buffer window.
 385 If a number, never let the tree buffer grow taller than that number of
 386 lines."
 387   :type '(choice boolean
 388                  integer)
 389   :group 'gnus-summary-tree)
 390
 391 (defcustom gnus-selected-tree-face 'mode-line
 392   "*Face used for highlighting selected articles in the thread tree."
 393   :type 'face
 394   :group 'gnus-summary-tree)
 395
 396 (defvar gnus-tree-brackets '((?\[ . ?\]) (?\( . ?\))
 397                              (?\{ . ?\}) (?< . ?>))
 398   "Brackets used in tree nodes.")
 399
 400 (defvar gnus-tree-parent-child-edges '(?- ?\\ ?|)
 401   "Characters used to connect parents with children.")
 402
 403 (defcustom gnus-tree-mode-line-format "Gnus: %%b %S %Z"
 404   "*The format specification for the tree mode line."
 405   :type 'string
 406   :group 'gnus-summary-tree)
 407
 408 (defcustom gnus-generate-tree-function 'gnus-generate-vertical-tree
 409   "*Function for generating a thread tree.
 410 Two predefined functions are available:
 411 `gnus-generate-horizontal-tree' and `gnus-generate-vertical-tree'."
 412   :type '(radio (function-item gnus-generate-vertical-tree)
 413                 (function-item gnus-generate-horizontal-tree)
 414                 (function :tag "Other" nil))
 415   :group 'gnus-summary-tree)
 416
 417 (defcustom gnus-tree-mode-hook nil
 418   "*Hook run in tree mode buffers."
 419   :type 'hook
 420   :group 'gnus-summary-tree)
 421
 422 (when (featurep 'xemacs)
 423   (add-hook 'gnus-tree-mode-hook 'gnus-xmas-tree-menu-add)
 424   (add-hook 'gnus-tree-mode-hook 'gnus-xmas-switch-horizontal-scrollbar-off))
 425
 426
 427 ;;; Internal variables.
 428
 429 (defvar gnus-tmp-name)
 430 (defvar gnus-tmp-from)
 431 (defvar gnus-tmp-number)
 432 (defvar gnus-tmp-open-bracket)
 433 (defvar gnus-tmp-close-bracket)
 434 (defvar gnus-tmp-subject)
 435
 436 (defvar gnus-tree-line-format-alist
 437   `((?n gnus-tmp-name ?s)
 438     (?f gnus-tmp-from ?s)
 439     (?N gnus-tmp-number ?d)
 440     (?\[ gnus-tmp-open-bracket ?c)
 441     (?\] gnus-tmp-close-bracket ?c)
 442     (?s gnus-tmp-subject ?s)))
 443
 444 (defvar gnus-tree-mode-line-format-alist gnus-summary-mode-line-format-alist)
 445
 446 (defvar gnus-tree-mode-line-format-spec nil)
 447 (defvar gnus-tree-line-format-spec nil)
 448
 449 (defvar gnus-tree-node-length nil)
 450 (defvar gnus-selected-tree-overlay nil)
 451
 452 (defvar gnus-tree-displayed-thread nil)
 453 (defvar gnus-tree-inhibit nil)
 454
 455 (defvar gnus-tree-mode-map
 456   (let ((map (make-keymap)))
 457     (suppress-keymap map)
 458     (gnus-define-keys
 459         map
 460       "\r" gnus-tree-select-article
 461       gnus-mouse-2 gnus-tree-pick-article
 462       "\C-?" gnus-tree-read-summary-keys
 463       "h" gnus-tree-show-summary
 464
 465       "\C-c\C-i" gnus-info-find-node)
 466
 467     (substitute-key-definition
 468      'undefined 'gnus-tree-read-summary-keys map)
 469     map))
 470
 471 (put 'gnus-tree-mode 'mode-class 'special)
 472
 473 (defun gnus-tree-make-menu-bar ()
 474   (unless (boundp 'gnus-tree-menu)
 475     (easy-menu-define
 476       gnus-tree-menu gnus-tree-mode-map ""
 477       '("Tree"
 478         ["Select article" gnus-tree-select-article t]))))
 479
 480 (define-derived-mode gnus-tree-mode fundamental-mode "Tree"
 481   "Major mode for displaying thread trees."
 482   (gnus-set-format 'tree-mode)
 483   (gnus-set-format 'tree t)
 484   (when (gnus-visual-p 'tree-menu 'menu)
 485     (gnus-tree-make-menu-bar))
 486   (gnus-simplify-mode-line)
 487   (buffer-disable-undo)
 488   (setq buffer-read-only t)
 489   (setq truncate-lines t)
 490   (save-current-buffer
 491     (gnus-set-work-buffer)
 492     (gnus-tree-node-insert (make-mail-header "") nil)
 493     (setq gnus-tree-node-length (1- (point)))))
 494
 495 (defun gnus-tree-read-summary-keys (&optional arg)
 496   "Read a summary buffer key sequence and execute it."
 497   (interactive "P")
 498   (unless gnus-tree-inhibit
 499     (let ((buf (current-buffer))
 500           (gnus-tree-inhibit t)
 501           win)
 502       (set-buffer gnus-article-buffer)
 503       (gnus-article-read-summary-keys arg nil t)
 504       (when (setq win (get-buffer-window buf))
 505         (select-window win)
 506         (when gnus-selected-tree-overlay
 507           (goto-char (or (overlay-end gnus-selected-tree-overlay) 1)))
 508         (gnus-tree-minimize)))))
 509
 510 (defun gnus-tree-show-summary ()
 511   "Reconfigure windows to show summary buffer."
 512   (interactive)
 513   (if (not (gnus-buffer-live-p gnus-summary-buffer))
 514       (error "There is no summary buffer for this tree buffer")
 515     (gnus-configure-windows 'article)
 516     (gnus-summary-goto-subject gnus-current-article)))
 517
 518 (defun gnus-tree-select-article (article)
 519   "Select the article under point, if any."
 520   (interactive (list (gnus-tree-article-number)))
 521   (let ((buf (current-buffer)))
 522     (when article
 523       (with-current-buffer gnus-summary-buffer
 524         (gnus-summary-goto-article article))
 525       (select-window (get-buffer-window buf)))))
 526
 527 (defun gnus-tree-pick-article (e)
 528   "Select the article under the mouse pointer."
 529   (interactive "e")
 530   (mouse-set-point e)
 531   (gnus-tree-select-article (gnus-tree-article-number)))
 532
 533 (defun gnus-tree-article-number ()
 534   (get-text-property (point) 'gnus-number))
 535
 536 (defun gnus-tree-article-region (article)
 537   "Return a cons with BEG and END of the article region."
 538   (let ((pos (text-property-any
 539               (point-min) (point-max) 'gnus-number article)))
 540     (when pos
 541       (cons pos (next-single-property-change pos 'gnus-number)))))
 542
 543 (defun gnus-tree-recenter ()
 544   "Center point in the tree window."
 545   (let ((selected (selected-window))
 546         (tree-window (gnus-get-buffer-window gnus-tree-buffer t)))
 547     (when tree-window
 548       (select-window tree-window)
 549       (when gnus-selected-tree-overlay
 550         (goto-char (or (overlay-end gnus-selected-tree-overlay) 1)))
 551       (let* ((top (cond ((< (window-height) 4) 0)
 552                         ((< (window-height) 7) 1)
 553                         (t 2)))
 554              (height (1- (window-height)))
 555              (bottom (save-excursion (goto-char (point-max))
 556                                      (forward-line (- height))
 557                                      (point))))
 558       ;; Set the window start to either `bottom', which is the biggest
 559         ;; possible valid number, or the second line from the top,
 560         ;; whichever is the least.
 561         (set-window-start
 562          tree-window (min bottom (save-excursion
 563                                    (forward-line (- top)) (point)))))
 564       (select-window selected))))
 565
 566 (defun gnus-get-tree-buffer ()
 567   "Return the tree buffer properly initialized."
 568   (with-current-buffer (gnus-get-buffer-create gnus-tree-buffer)
 569     (unless (derived-mode-p 'gnus-tree-mode)
 570       (gnus-tree-mode))
 571     (current-buffer)))
 572
 573 (defun gnus-tree-minimize ()
 574   (when (and gnus-tree-minimize-window
 575              (not (one-window-p)))
 576     (let ((windows 0)
 577           tot-win-height)
 578       (walk-windows (lambda (_window) (incf windows)))
 579       (setq tot-win-height
 580             (- (frame-height)
 581                (* window-min-height (1- windows))
 582                2))
 583       (let* ((window-min-height 2)
 584              (height (count-lines (point-min) (point-max)))
 585              (min (max (1- window-min-height) height))
 586              (tot (if (numberp gnus-tree-minimize-window)
 587                       (min gnus-tree-minimize-window min)
 588                     min))
 589              (win (get-buffer-window (current-buffer)))
 590              (wh (and win (1- (window-height win)))))
 591         (setq tot (min tot tot-win-height))
 592         (when (and win
 593                    (not (eq tot wh)))
 594           (let ((selected (selected-window)))
 595             (when (ignore-errors (select-window win))
 596               (enlarge-window (- tot wh))
 597               (select-window selected))))))))
 598
 599 ;;; Generating the tree.
 600
 601 (defun gnus-tree-node-insert (header sparse &optional adopted)
 602   (let* ((dummy (stringp header))
 603          (header (if (vectorp header) header
 604                    (progn
 605                      (setq header (make-mail-header "*****"))
 606                      (mail-header-set-number header 0)
 607                      (mail-header-set-lines header 0)
 608                      (mail-header-set-chars header 0)
 609                      header)))
 610          (gnus-tmp-from (mail-header-from header))
 611          (gnus-tmp-subject (mail-header-subject header))
 612          (gnus-tmp-number (mail-header-number header))
 613          (gnus-tmp-name
 614           (cond
 615            ((string-match "(.+)" gnus-tmp-from)
 616             (substring gnus-tmp-from
 617                        (1+ (match-beginning 0)) (1- (match-end 0))))
 618            ((string-match "<[^>]+> *$" gnus-tmp-from)
 619             (let ((beg (match-beginning 0)))
 620               (or (and (string-match "^\"[^\"]*\"" gnus-tmp-from)
 621                        (substring gnus-tmp-from (1+ (match-beginning 0))
 622                                   (1- (match-end 0))))
 623                   (substring gnus-tmp-from 0 beg))))
 624            ((memq gnus-tmp-number sparse)
 625             "***")
 626            (t gnus-tmp-from)))
 627          (gnus-tmp-open-bracket
 628           (cond ((memq gnus-tmp-number sparse)
 629                  (caadr gnus-tree-brackets))
 630                 (dummy (caaddr gnus-tree-brackets))
 631                 (adopted (car (nth 3 gnus-tree-brackets)))
 632                 (t (caar gnus-tree-brackets))))
 633          (gnus-tmp-close-bracket
 634           (cond ((memq gnus-tmp-number sparse)
 635                  (cdadr gnus-tree-brackets))
 636                 (adopted (cdr (nth 3 gnus-tree-brackets)))
 637                 (dummy
 638                  (cdaddr gnus-tree-brackets))
 639                 (t (cdar gnus-tree-brackets))))
 640          (buffer-read-only nil)
 641          beg end)
 642     (gnus-add-text-properties
 643      (setq beg (point))
 644      (setq end (progn (eval gnus-tree-line-format-spec) (point)))
 645      (list 'gnus-number gnus-tmp-number))
 646     (when (or t (gnus-visual-p 'tree-highlight 'highlight))
 647       (gnus-tree-highlight-node gnus-tmp-number beg end))))
 648
 649 (defmacro gnus--let-eval (bindings evalsym &rest body)
 650   "Build an environment in which to evaluate expressions.
 651 BINDINGS is a `let'-style list of bindings to use for the environment.
 652 EVALSYM is then bound in BODY to a function that takes a sexp and evaluates
 653 it in the environment specified by BINDINGS."
 654   (declare (indent 2) (debug ((&rest (sym form)) sym body)))
 655   (if (ignore-errors (let ((x 3)) (eq (eval '(- x 1) '((x . 4))) x)))
 656       ;; Use lexical vars if possible.
 657       `(let* ((env (list ,@(mapcar (lambda (binding)
 658                                      `(cons ',(car binding) ,(cadr binding)))
 659                                    bindings)))
 660              (,evalsym (lambda (exp) (eval exp env))))
 661          ,@body)
 662     `(let (,@bindings (,evalsym #'eval)) ,@body)))
 663
 664 (defun gnus-tree-highlight-node (article beg end)
 665   "Highlight current line according to `gnus-summary-highlight'."
 666   (let ((list gnus-summary-highlight)
 667         face)
 668     (with-current-buffer gnus-summary-buffer
 669       (let ((uncached (memq article gnus-newsgroup-undownloaded)))
 670         (gnus--let-eval
 671             ((score (or (cdr (assq article gnus-newsgroup-scored))
 672                         gnus-summary-default-score 0))
 673              (default gnus-summary-default-score)
 674              (default-high gnus-summary-default-high-score)
 675              (default-low gnus-summary-default-low-score)
 676              (uncached uncached)
 677              (downloaded (not uncached))
 678              (mark (or (gnus-summary-article-mark article) gnus-unread-mark)))
 679             evalfun
 680           ;; Eval the cars of the lists until we find a match.
 681           (while (and list
 682                       (not (funcall evalfun (caar list))))
 683             (setq list (cdr list))))))
 684     (unless (eq (setq face (cdar list)) (gnus-get-text-property-excluding-characters-with-faces beg 'face))
 685       (gnus-put-text-property-excluding-characters-with-faces
 686        beg end 'face
 687        (if (boundp face) (symbol-value face) face)))))
 688
 689 (defun gnus-tree-indent (level)
 690   (insert (make-string (1- (* (1+ gnus-tree-node-length) level)) ? )))
 691
 692 (defvar gnus-tmp-limit)
 693 (defvar gnus-tmp-sparse)
 694 (defvar gnus-tmp-indent)
 695
 696 (defun gnus-generate-tree (thread)
 697   "Generate a thread tree for THREAD."
 698   (with-current-buffer (gnus-get-tree-buffer)
 699     (let ((buffer-read-only nil)
 700           (gnus-tmp-indent 0))
 701       (erase-buffer)
 702       (funcall gnus-generate-tree-function thread 0)
 703       (gnus-set-mode-line 'tree)
 704       (goto-char (point-min))
 705       (gnus-tree-minimize)
 706       (gnus-tree-recenter)
 707       (let ((selected (selected-window)))
 708         (when (gnus-get-buffer-window (set-buffer gnus-tree-buffer) t)
 709           (select-window (gnus-get-buffer-window (set-buffer gnus-tree-buffer) t))
 710           (gnus-horizontal-recenter)
 711           (select-window selected))))))
 712
 713 (defun gnus-generate-horizontal-tree (thread level &optional dummyp adopted)
 714   "Generate a horizontal tree."
 715   (let* ((dummy (stringp (car thread)))
 716          (do (or dummy
 717                  (and (car thread)
 718                       (memq (mail-header-number (car thread))
 719                             gnus-tmp-limit))))
 720          col beg)
 721     (if (not do)
 722         ;; We don't want this article.
 723         (setq thread (cdr thread))
 724       (if (not (bolp))
 725           ;; Not the first article on the line, so we insert a "-".
 726           (insert (car gnus-tree-parent-child-edges))
 727         ;; If the level isn't zero, then we insert some indentation.
 728         (unless (zerop level)
 729           (gnus-tree-indent level)
 730           (insert (cadr gnus-tree-parent-child-edges))
 731           (setq col (- (setq beg (point)) (point-at-bol) 1))
 732           ;; Draw "|" lines upwards.
 733           (while (progn
 734                    (forward-line -1)
 735                    (forward-char col)
 736                    (eq (char-after) ? ))
 737             (delete-char 1)
 738             (insert (caddr gnus-tree-parent-child-edges)))
 739           (goto-char beg)))
 740       (setq dummyp nil)
 741       ;; Insert the article node.
 742       (gnus-tree-node-insert (pop thread) gnus-tmp-sparse adopted))
 743     (if (null thread)
 744         ;; End of the thread, so we go to the next line.
 745         (unless (bolp)
 746           (insert "\n"))
 747       ;; Recurse downwards in all children of this article.
 748       (while thread
 749         (gnus-generate-horizontal-tree
 750          (pop thread) (if do (1+ level) level)
 751          (or dummyp dummy) dummy)))))
 752
 753 (defsubst gnus-tree-indent-vertical ()
 754   (let ((len (- (* (1+ gnus-tree-node-length) gnus-tmp-indent)
 755                 (- (point) (point-at-bol)))))
 756     (when (> len 0)
 757       (insert (make-string len ? )))))
 758
 759 (defsubst gnus-tree-forward-line (n)
 760   (while (>= (decf n) 0)
 761     (unless (zerop (forward-line 1))
 762       (end-of-line)
 763       (insert "\n")))
 764   (end-of-line))
 765
 766 (defun gnus-generate-vertical-tree (thread level &optional dummyp adopted)
 767   "Generate a vertical tree."
 768   (let* ((dummy (stringp (car thread)))
 769          (do (or dummy
 770                  (and (car thread)
 771                       (memq (mail-header-number (car thread))
 772                             gnus-tmp-limit))))
 773          beg)
 774     (if (not do)
 775         ;; We don't want this article.
 776         (setq thread (cdr thread))
 777       (if (not (save-excursion (beginning-of-line) (bobp)))
 778           ;; Not the first article on the line, so we insert a "-".
 779           (progn
 780             (gnus-tree-indent-vertical)
 781             (insert (make-string (/ gnus-tree-node-length 2) ? ))
 782             (insert (caddr gnus-tree-parent-child-edges))
 783             (gnus-tree-forward-line 1))
 784         ;; If the level isn't zero, then we insert some indentation.
 785         (unless (zerop gnus-tmp-indent)
 786           (gnus-tree-forward-line (1- (* 2 level)))
 787           (gnus-tree-indent-vertical)
 788           (delete-char -1)
 789           (insert (cadr gnus-tree-parent-child-edges))
 790           (setq beg (point))
 791           (forward-char -1)
 792           ;; Draw "-" lines leftwards.
 793           (while (and (not (bobp))
 794                       (eq (char-after (1- (point))) ? ))
 795             (delete-char -1)
 796             (insert (car gnus-tree-parent-child-edges))
 797             (forward-char -1))
 798           (goto-char beg)
 799           (gnus-tree-forward-line 1)))
 800       (setq dummyp nil)
 801       ;; Insert the article node.
 802       (gnus-tree-indent-vertical)
 803       (gnus-tree-node-insert (pop thread) gnus-tmp-sparse adopted)
 804       (gnus-tree-forward-line 1))
 805     (if (null thread)
 806         ;; End of the thread, so we go to the next line.
 807         (progn
 808           (goto-char (point-min))
 809           (end-of-line)
 810           (incf gnus-tmp-indent))
 811       ;; Recurse downwards in all children of this article.
 812       (while thread
 813         (gnus-generate-vertical-tree
 814          (pop thread) (if do (1+ level) level)
 815          (or dummyp dummy) dummy)))))
 816
 817 ;;; Interface functions.
 818
 819 (defun gnus-possibly-generate-tree (article &optional force)
 820   "Generate the thread tree for ARTICLE if it isn't displayed already."
 821   (when (with-current-buffer gnus-summary-buffer
 822           (and gnus-use-trees
 823                gnus-show-threads
 824                (vectorp (gnus-summary-article-header article))))
 825     (save-excursion
 826       (let ((top (with-current-buffer gnus-summary-buffer
 827                    (gnus-cut-thread
 828                     (gnus-remove-thread
 829                      (mail-header-id
 830                       (gnus-summary-article-header article))
 831                      t))))
 832             (gnus-tmp-limit gnus-newsgroup-limit)
 833             (gnus-tmp-sparse gnus-newsgroup-sparse))
 834         (when (or force
 835                   (not (eq top gnus-tree-displayed-thread)))
 836           (gnus-generate-tree top)
 837           (setq gnus-tree-displayed-thread top))))))
 838
 839 (defun gnus-tree-open ()
 840   (gnus-get-tree-buffer))
 841
 842 (defun gnus-tree-close ()
 843   (gnus-kill-buffer gnus-tree-buffer))
 844
 845 (defun gnus-tree-perhaps-minimize ()
 846   (when (and gnus-tree-minimize-window
 847              (get-buffer gnus-tree-buffer))
 848     (with-current-buffer gnus-tree-buffer
 849       (gnus-tree-minimize))))
 850
 851 (defun gnus-highlight-selected-tree (article)
 852   "Highlight the selected article in the tree."
 853   (when (buffer-live-p gnus-tree-buffer)
 854     (let ((buf (current-buffer))
 855           region)
 856       (set-buffer gnus-tree-buffer)
 857       (when (setq region (gnus-tree-article-region article))
 858         (when (or (not gnus-selected-tree-overlay)
 859                   (gnus-extent-detached-p gnus-selected-tree-overlay))
 860           ;; Create a new overlay.
 861           (overlay-put
 862            (setq gnus-selected-tree-overlay
 863                  (make-overlay (point-min) (1+ (point-min))))
 864            'face gnus-selected-tree-face))
 865         ;; Move the overlay to the article.
 866         (move-overlay
 867          gnus-selected-tree-overlay (goto-char (car region)) (cdr region))
 868         (gnus-tree-minimize)
 869         (gnus-tree-recenter)
 870         (let ((selected (selected-window)))
 871           (when (gnus-get-buffer-window (set-buffer gnus-tree-buffer) t)
 872             (select-window
 873              (gnus-get-buffer-window (set-buffer gnus-tree-buffer) t))
 874             (gnus-horizontal-recenter)
 875             (select-window selected))))
 876       ;; If we remove this save-excursion, it updates the wrong mode lines?!?
 877       (with-current-buffer gnus-tree-buffer
 878         (gnus-set-mode-line 'tree))
 879       (set-buffer buf))))
 880
 881 (defun gnus-tree-highlight-article (article face)
 882   ;; The save-excursion here is apparently necessary because
 883   ;; `set-window-point' somehow manages to alter the buffer position.
 884   (save-excursion
 885     (with-current-buffer (gnus-get-tree-buffer)
 886       (let (region)
 887         (when (setq region (gnus-tree-article-region article))
 888           (gnus-put-text-property (car region) (cdr region) 'face face)
 889           (set-window-point
 890            (gnus-get-buffer-window (current-buffer) t) (cdr region)))))))
 891
 892 ;;; Allow redefinition of functions.
 893 (gnus-ems-redefine)
 894
 895 (provide 'gnus-salt)
 896
 897 ;;; gnus-salt.el ends here