code.delx.au - gnu-emacs/blob - lisp/net/eww.el

   1 ;;; eww.el --- Emacs Web Wowser  -*- lexical-binding:t -*-
   2
   3 ;; Copyright (C) 2013-2015 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; Keywords: html
   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 (require 'format-spec)
  29 (require 'shr)
  30 (require 'url)
  31 (require 'url-queue)
  32 (require 'url-util)                     ; for url-get-url-at-point
  33 (require 'mm-url)
  34 (require 'puny)
  35 (eval-when-compile (require 'subr-x)) ;; for string-trim
  36
  37 (defgroup eww nil
  38   "Emacs Web Wowser"
  39   :version "25.1"
  40   :link '(custom-manual "(eww) Top")
  41   :group 'web
  42   :prefix "eww-")
  43
  44 (defcustom eww-header-line-format "%t: %u"
  45   "Header line format.
  46 - %t is replaced by the title.
  47 - %u is replaced by the URL."
  48   :version "24.4"
  49   :group 'eww
  50   :type 'string)
  51
  52 (defcustom eww-search-prefix "https://duckduckgo.com/html/?q="
  53   "Prefix URL to search engine."
  54   :version "24.4"
  55   :group 'eww
  56   :type 'string)
  57
  58 (defcustom eww-download-directory "~/Downloads/"
  59   "Directory where files will downloaded."
  60   :version "24.4"
  61   :group 'eww
  62   :type 'string)
  63
  64 ;;;###autoload
  65 (defcustom eww-suggest-uris
  66   '(eww-links-at-point
  67     url-get-url-at-point
  68     eww-current-url)
  69   "List of functions called to form the list of default URIs for `eww'.
  70 Each of the elements is a function returning either a string or a list
  71 of strings.  The results will be joined into a single list with
  72 duplicate entries (if any) removed."
  73   :version "25.1"
  74   :group 'eww
  75   :type 'hook
  76   :options '(eww-links-at-point
  77              url-get-url-at-point
  78              eww-current-url))
  79
  80 (defcustom eww-bookmarks-directory user-emacs-directory
  81   "Directory where bookmark files will be stored."
  82   :version "25.1"
  83   :group 'eww
  84   :type 'string)
  85
  86 (defcustom eww-desktop-remove-duplicates t
  87   "Whether to remove duplicates from the history when saving desktop data.
  88 If non-nil, repetitive EWW history entries (comprising of the URI, the
  89 title, and the point position) will not be saved as part of the Emacs
  90 desktop.  Otherwise, such entries will be retained."
  91   :version "25.1"
  92   :group 'eww
  93   :type 'boolean)
  94
  95 (defcustom eww-restore-desktop nil
  96   "How to restore EWW buffers on `desktop-restore'.
  97 If t or `auto', the buffers will be reloaded automatically.
  98 If nil, buffers will require manual reload, and will contain the text
  99 specified in `eww-restore-reload-prompt' instead of the actual Web
 100 page contents."
 101   :version "25.1"
 102   :group 'eww
 103   :type '(choice (const :tag "Restore all automatically" t)
 104                  (const :tag "Require manual reload" nil)))
 105
 106 (defcustom eww-restore-reload-prompt
 107   "\n\n *** Use \\[eww-reload] to reload this buffer. ***\n"
 108   "The string to put in the buffers not reloaded on `desktop-restore'.
 109 This prompt will be used if `eww-restore-desktop' is nil.
 110
 111 The string will be passed through `substitute-command-keys'."
 112   :version "25.1"
 113   :group 'eww
 114   :type 'string)
 115
 116 (defcustom eww-history-limit 50
 117   "Maximum number of entries to retain in the history."
 118   :version "25.1"
 119   :group 'eww
 120   :type '(choice (const :tag "Unlimited" nil)
 121                  integer))
 122
 123 (defcustom eww-use-external-browser-for-content-type
 124   "\\`\\(video/\\|audio/\\|application/ogg\\)"
 125   "Always use external browser for specified content-type."
 126   :version "24.4"
 127   :group 'eww
 128   :type '(choice (const :tag "Never" nil)
 129                  regexp))
 130
 131 (defcustom eww-after-render-hook nil
 132   "A hook called after eww has finished rendering the buffer."
 133   :version "25.1"
 134   :group 'eww
 135   :type 'hook)
 136
 137 (defcustom eww-form-checkbox-selected-symbol "[X]"
 138   "Symbol used to represent a selected checkbox.
 139 See also `eww-form-checkbox-symbol'."
 140   :version "24.4"
 141   :group 'eww
 142   :type '(choice (const "[X]")
 143                  (const "☒")            ; Unicode BALLOT BOX WITH X
 144                  (const "☑")            ; Unicode BALLOT BOX WITH CHECK
 145                  string))
 146
 147 (defcustom eww-form-checkbox-symbol "[ ]"
 148   "Symbol used to represent a checkbox.
 149 See also `eww-form-checkbox-selected-symbol'."
 150   :version "24.4"
 151   :group 'eww
 152   :type '(choice (const "[ ]")
 153                  (const "☐")            ; Unicode BALLOT BOX
 154                  string))
 155
 156 (defface eww-form-submit
 157   '((((type x w32 ns) (class color))    ; Like default mode line
 158      :box (:line-width 2 :style released-button)
 159      :background "#808080" :foreground "black"))
 160   "Face for eww buffer buttons."
 161   :version "24.4"
 162   :group 'eww)
 163
 164 (defface eww-form-file
 165   '((((type x w32 ns) (class color))    ; Like default mode line
 166      :box (:line-width 2 :style released-button)
 167      :background "#808080" :foreground "black"))
 168   "Face for eww buffer buttons."
 169   :version "25.1"
 170   :group 'eww)
 171
 172 (defface eww-form-checkbox
 173   '((((type x w32 ns) (class color))    ; Like default mode line
 174      :box (:line-width 2 :style released-button)
 175      :background "lightgrey" :foreground "black"))
 176   "Face for eww buffer buttons."
 177   :version "24.4"
 178   :group 'eww)
 179
 180 (defface eww-form-select
 181   '((((type x w32 ns) (class color))    ; Like default mode line
 182      :box (:line-width 2 :style released-button)
 183      :background "lightgrey" :foreground "black"))
 184   "Face for eww buffer buttons."
 185   :version "24.4"
 186   :group 'eww)
 187
 188 (defface eww-form-text
 189   '((t (:background "#505050"
 190                     :foreground "white"
 191                     :box (:line-width 1))))
 192   "Face for eww text inputs."
 193   :version "24.4"
 194   :group 'eww)
 195
 196 (defface eww-form-textarea
 197   '((t (:background "#C0C0C0"
 198                     :foreground "black"
 199                     :box (:line-width 1))))
 200   "Face for eww textarea inputs."
 201   :version "24.4"
 202   :group 'eww)
 203
 204 (defface eww-invalid-certificate
 205   '((default :weight bold)
 206     (((class color)) :foreground "red"))
 207   "Face for web pages with invalid certificates."
 208   :version "25.1"
 209   :group 'eww)
 210
 211 (defface eww-valid-certificate
 212   '((default :weight bold)
 213     (((class color)) :foreground "ForestGreen"))
 214   "Face for web pages with valid certificates."
 215   :version "25.1"
 216   :group 'eww)
 217
 218 (defvar eww-data nil)
 219 (defvar eww-history nil)
 220 (defvar eww-history-position 0)
 221
 222 (defvar eww-local-regex "localhost"
 223   "When this regex is found in the URL, it's not a keyword but an address.")
 224
 225 (defvar eww-link-keymap
 226   (let ((map (copy-keymap shr-map)))
 227     (define-key map "\r" 'eww-follow-link)
 228     map))
 229
 230 (defun eww-suggested-uris nil
 231   "Return the list of URIs to suggest at the `eww' prompt.
 232 This list can be customized via `eww-suggest-uris'."
 233   (let ((obseen (make-vector 42 0))
 234         (uris nil))
 235     (dolist (fun eww-suggest-uris)
 236       (let ((ret (funcall fun)))
 237         (dolist (uri (if (stringp ret) (list ret) ret))
 238           (when (and uri (not (intern-soft uri obseen)))
 239             (intern uri obseen)
 240             (push   uri uris)))))
 241     (nreverse uris)))
 242
 243 ;;;###autoload
 244 (defun eww (url)
 245   "Fetch URL and render the page.
 246 If the input doesn't look like an URL or a domain name, the
 247 word(s) will be searched for via `eww-search-prefix'."
 248   (interactive
 249    (let* ((uris (eww-suggested-uris))
 250           (prompt (concat "Enter URL or keywords"
 251                           (if uris (format " (default %s)" (car uris)) "")
 252                           ": ")))
 253      (list (read-string prompt nil nil uris))))
 254   (setq url (string-trim url))
 255   (cond ((string-match-p "\\`file:/" url))
 256         ;; Don't mangle file: URLs at all.
 257         ((string-match-p "\\`ftp://" url)
 258          (user-error "FTP is not supported"))
 259         (t
 260          ;; Anything that starts with something that vaguely looks
 261          ;; like a protocol designator is interpreted as a full URL.
 262          (if (or (string-match "\\`[A-Za-z]+:" url)
 263                  ;; Also try to match "naked" URLs like
 264                  ;; en.wikipedia.org/wiki/Free software
 265                  (string-match "\\`[A-Za-z_]+\\.[A-Za-z._]+/" url)
 266                  (and (= (length (split-string url)) 1)
 267                       (or (and (not (string-match-p "\\`[\"'].*[\"']\\'" url))
 268                                (> (length (split-string url "[.:]")) 1))
 269                           (string-match eww-local-regex url))))
 270              (progn
 271                (unless (string-match-p "\\`[a-zA-Z][-a-zA-Z0-9+.]*://" url)
 272                  (setq url (concat "http://" url)))
 273                ;; Some sites do not redirect final /
 274                (when (string= (url-filename (url-generic-parse-url url)) "")
 275                  (setq url (concat url "/"))))
 276            (setq url (concat eww-search-prefix
 277                              (replace-regexp-in-string " " "+" url))))))
 278   (eww-setup-buffer)
 279   ;; Check whether the domain only uses "Highly Restricted" Unicode
 280   ;; IDNA characters.  If not, transform to punycode to indicate that
 281   ;; there may be funny business going on.
 282   (let ((parsed (url-generic-parse-url url)))
 283     (unless (puny-highly-restrictive-domain-p (url-host parsed))
 284       (setf (url-host parsed) (puny-encode-domain (url-host parsed)))
 285       (setq url (url-recreate-url parsed))))
 286   (plist-put eww-data :url url)
 287   (plist-put eww-data :title "")
 288   (eww-update-header-line-format)
 289   (let ((inhibit-read-only t))
 290     (insert (format "Loading %s..." url))
 291     (goto-char (point-min)))
 292   (url-retrieve url 'eww-render
 293                 (list url nil (current-buffer))))
 294
 295 ;;;###autoload (defalias 'browse-web 'eww)
 296
 297 ;;;###autoload
 298 (defun eww-open-file (file)
 299   "Render FILE using EWW."
 300   (interactive "fFile: ")
 301   (eww (concat "file://"
 302                (and (memq system-type '(windows-nt ms-dos))
 303                     "/")
 304                (expand-file-name file))))
 305
 306 ;;;###autoload
 307 (defun eww-search-words (&optional beg end)
 308   "Search the web for the text between BEG and END.
 309 See the `eww-search-prefix' variable for the search engine used."
 310   (interactive "r")
 311   (eww (buffer-substring beg end)))
 312
 313 (defun eww-html-p (content-type)
 314   "Return non-nil if CONTENT-TYPE designates an HTML content type.
 315 Currently this means either text/html or application/xhtml+xml."
 316   (member content-type '("text/html"
 317                          "application/xhtml+xml")))
 318
 319 (defun eww-render (status url &optional point buffer encode)
 320   (let ((redirect (plist-get status :redirect)))
 321     (when redirect
 322       (setq url redirect)))
 323   (let* ((headers (eww-parse-headers))
 324          (content-type
 325           (mail-header-parse-content-type
 326            (or (cdr (assoc "content-type" headers))
 327                "text/plain")))
 328          (charset (intern
 329                    (downcase
 330                     (or (cdr (assq 'charset (cdr content-type)))
 331                         (eww-detect-charset (eww-html-p (car content-type)))
 332                         "utf-8"))))
 333          (data-buffer (current-buffer))
 334          last-coding-system-used)
 335     ;; Save the https peer status.
 336     (with-current-buffer buffer
 337       (plist-put eww-data :peer (plist-get status :peer)))
 338     (unwind-protect
 339         (progn
 340           (cond
 341            ((and eww-use-external-browser-for-content-type
 342                  (string-match-p eww-use-external-browser-for-content-type
 343                                  (car content-type)))
 344             (eww-browse-with-external-browser url))
 345            ((eww-html-p (car content-type))
 346             (eww-display-html charset url nil point buffer encode))
 347            ((equal (car content-type) "application/pdf")
 348             (eww-display-pdf))
 349            ((string-match-p "\\`image/" (car content-type))
 350             (eww-display-image buffer))
 351            (t
 352             (eww-display-raw buffer (or encode charset 'utf-8))))
 353           (with-current-buffer buffer
 354             (plist-put eww-data :url url)
 355             (eww-update-header-line-format)
 356             (setq eww-history-position 0)
 357             (and last-coding-system-used
 358                  (set-buffer-file-coding-system last-coding-system-used))
 359             (run-hooks 'eww-after-render-hook)))
 360       (kill-buffer data-buffer))))
 361
 362 (defun eww-parse-headers ()
 363   (let ((headers nil))
 364     (goto-char (point-min))
 365     (while (and (not (eobp))
 366                 (not (eolp)))
 367       (when (looking-at "\\([^:]+\\): *\\(.*\\)")
 368         (push (cons (downcase (match-string 1))
 369                     (match-string 2))
 370               headers))
 371       (forward-line 1))
 372     (unless (eobp)
 373       (forward-line 1))
 374     headers))
 375
 376 (defun eww-detect-charset (html-p)
 377   (let ((case-fold-search t)
 378         (pt (point)))
 379     (or (and html-p
 380              (re-search-forward
 381               "<meta[\t\n\r ]+[^>]*charset=\"?\\([^\t\n\r \"/>]+\\)[\\\"'.*]" nil t)
 382              (goto-char pt)
 383              (match-string 1))
 384         (and (looking-at
 385               "[\t\n\r ]*<\\?xml[\t\n\r ]+[^>]*encoding=\"\\([^\"]+\\)")
 386              (match-string 1)))))
 387
 388 (declare-function libxml-parse-html-region "xml.c"
 389                   (start end &optional base-url discard-comments))
 390
 391 (defun eww-display-html (charset url &optional document point buffer encode)
 392   (unless (fboundp 'libxml-parse-html-region)
 393     (error "This function requires Emacs to be compiled with libxml2"))
 394   (unless (buffer-live-p buffer)
 395     (error "Buffer %s doesn't exist" buffer))
 396   ;; There should be a better way to abort loading images
 397   ;; asynchronously.
 398   (setq url-queue nil)
 399   (let ((document
 400          (or document
 401              (list
 402               'base (list (cons 'href url))
 403               (progn
 404                 (setq encode (or encode charset 'utf-8))
 405                 (condition-case nil
 406                     (decode-coding-region (point) (point-max) encode)
 407                   (coding-system-error nil))
 408                 (libxml-parse-html-region (point) (point-max))))))
 409         (source (and (null document)
 410                      (buffer-substring (point) (point-max)))))
 411     (with-current-buffer buffer
 412       (setq bidi-paragraph-direction 'left-to-right)
 413       (plist-put eww-data :source source)
 414       (plist-put eww-data :dom document)
 415       (let ((inhibit-read-only t)
 416             (inhibit-modification-hooks t)
 417             (shr-target-id (url-target (url-generic-parse-url url)))
 418             (shr-external-rendering-functions
 419              (append
 420               shr-external-rendering-functions
 421               '((title . eww-tag-title)
 422                 (form . eww-tag-form)
 423                 (input . eww-tag-input)
 424                 (button . eww-form-submit)
 425                 (textarea . eww-tag-textarea)
 426                 (select . eww-tag-select)
 427                 (link . eww-tag-link)
 428                 (meta . eww-tag-meta)
 429                 (a . eww-tag-a)))))
 430         (erase-buffer)
 431         (shr-insert-document document)
 432         (cond
 433          (point
 434           (goto-char point))
 435          (shr-target-id
 436           (goto-char (point-min))
 437           (let ((point (next-single-property-change
 438                         (point-min) 'shr-target-id)))
 439             (when point
 440               (goto-char point))))
 441          (t
 442           (goto-char (point-min))
 443           ;; Don't leave point inside forms, because the normal eww
 444           ;; commands aren't available there.
 445           (while (and (not (eobp))
 446                       (get-text-property (point) 'eww-form))
 447             (forward-line 1)))))
 448       (eww-size-text-inputs))))
 449
 450 (defun eww-handle-link (dom)
 451   (let* ((rel (dom-attr dom 'rel))
 452          (href (dom-attr dom 'href))
 453          (where (assoc
 454                  ;; The text associated with :rel is case-insensitive.
 455                  (if rel (downcase rel))
 456                  '(("next" . :next)
 457                    ;; Texinfo uses "previous", but HTML specifies
 458                    ;; "prev", so recognize both.
 459                    ("previous" . :previous)
 460                    ("prev" . :previous)
 461                    ;; HTML specifies "start" but also "contents",
 462                    ;; and Gtk seems to use "home".  Recognize
 463                    ;; them all; but store them in different
 464                    ;; variables so that we can readily choose the
 465                    ;; "best" one.
 466                    ("start" . :start)
 467                    ("home" . :home)
 468                    ("contents" . :contents)
 469                    ("up" . :up)))))
 470     (and href
 471          where
 472          (plist-put eww-data (cdr where) href))))
 473
 474 (defvar eww-redirect-level 1)
 475
 476 (defun eww-tag-meta (dom)
 477   (when (and (cl-equalp (dom-attr dom 'http-equiv) "refresh")
 478              (< eww-redirect-level 5))
 479     (when-let (refresh (dom-attr dom 'content))
 480       (when (or (string-match "^\\([0-9]+\\) *;.*url=\"\\([^\"]+\\)\"" refresh)
 481                 (string-match "^\\([0-9]+\\) *;.*url=\\([^ ]+\\)" refresh))
 482         (let ((timeout (match-string 1 refresh))
 483               (url (match-string 2 refresh))
 484               (eww-redirect-level (1+ eww-redirect-level)))
 485           (if (equal timeout "0")
 486               (eww (shr-expand-url url))
 487             (eww-tag-a
 488              (dom-node 'a `((href . ,(shr-expand-url url)))
 489                        (format "Auto refresh in %s second%s disabled"
 490                                timeout
 491                                (if (equal timeout "1")
 492                                    ""
 493                                  "s"))))))))))
 494
 495 (defun eww-tag-link (dom)
 496   (eww-handle-link dom)
 497   (shr-generic dom))
 498
 499 (defun eww-tag-a (dom)
 500   (eww-handle-link dom)
 501   (let ((start (point)))
 502     (shr-tag-a dom)
 503     (put-text-property start (point) 'keymap eww-link-keymap)))
 504
 505 (defun eww-update-header-line-format ()
 506   (setq header-line-format
 507         (and eww-header-line-format
 508              (let ((title (plist-get eww-data :title))
 509                    (peer (plist-get eww-data :peer)))
 510                (when (zerop (length title))
 511                  (setq title "[untitled]"))
 512                ;; This connection has is https.
 513                (when peer
 514                  (setq title
 515                        (propertize title 'face
 516                                    (if (plist-get peer :warnings)
 517                                        'eww-invalid-certificate
 518                                      'eww-valid-certificate))))
 519                (replace-regexp-in-string
 520                 "%" "%%"
 521                 (format-spec
 522                  eww-header-line-format
 523                  `((?u . ,(or (plist-get eww-data :url) ""))
 524                    (?t . ,title))))))))
 525
 526 (defun eww-tag-title (dom)
 527   (plist-put eww-data :title
 528              (replace-regexp-in-string
 529               "^ \\| $" ""
 530               (replace-regexp-in-string "[ \t\r\n]+" " " (dom-text dom))))
 531   (eww-update-header-line-format))
 532
 533 (defun eww-display-raw (buffer &optional encode)
 534   (let ((data (buffer-substring (point) (point-max))))
 535     (unless (buffer-live-p buffer)
 536       (error "Buffer %s doesn't exist" buffer))
 537     (with-current-buffer buffer
 538       (let ((inhibit-read-only t))
 539         (erase-buffer)
 540         (insert data)
 541         (condition-case nil
 542             (decode-coding-region (point-min) (1+ (length data)) encode)
 543           (coding-system-error nil)))
 544       (goto-char (point-min)))))
 545
 546 (defun eww-display-image (buffer)
 547   (let ((data (shr-parse-image-data)))
 548     (unless (buffer-live-p buffer)
 549       (error "Buffer %s doesn't exist" buffer))
 550     (with-current-buffer buffer
 551       (let ((inhibit-read-only t))
 552         (erase-buffer)
 553         (shr-put-image data nil))
 554       (goto-char (point-min)))))
 555
 556 (declare-function mailcap-view-mime "mailcap" (type))
 557 (defun eww-display-pdf ()
 558   (let ((data (buffer-substring (point) (point-max))))
 559     (switch-to-buffer (get-buffer-create "*eww pdf*"))
 560     (let ((coding-system-for-write 'raw-text)
 561           (inhibit-read-only t))
 562       (erase-buffer)
 563       (insert data)
 564       (mailcap-view-mime "application/pdf")))
 565   (goto-char (point-min)))
 566
 567 (defun eww-setup-buffer ()
 568   (switch-to-buffer (get-buffer-create "*eww*"))
 569   (when (or (plist-get eww-data :url)
 570             (plist-get eww-data :dom))
 571     (eww-save-history))
 572   (let ((inhibit-read-only t))
 573     (remove-overlays)
 574     (erase-buffer))
 575   (setq bidi-paragraph-direction 'left-to-right)
 576   (unless (eq major-mode 'eww-mode)
 577     (eww-mode)))
 578
 579 (defun eww-current-url nil
 580   "Return URI of the Web page the current EWW buffer is visiting."
 581   (plist-get eww-data :url))
 582
 583 (defun eww-links-at-point ()
 584   "Return list of URIs, if any, linked at point."
 585   (remq nil
 586         (list (get-text-property (point) 'shr-url)
 587               (get-text-property (point) 'image-url))))
 588
 589 (defun eww-view-source ()
 590   "View the HTML source code of the current page."
 591   (interactive)
 592   (let ((buf (get-buffer-create "*eww-source*"))
 593         (source (plist-get eww-data :source)))
 594     (with-current-buffer buf
 595       (let ((inhibit-read-only t))
 596         (delete-region (point-min) (point-max))
 597         (insert (or source "no source"))
 598         (goto-char (point-min))
 599         ;; Decode the source and set the buffer's encoding according
 600         ;; to what the HTML source specifies in its 'charset' header,
 601         ;; if any.
 602         (let ((cs (find-auto-coding "" (point-max))))
 603           (when (consp cs)
 604             (setq cs (car cs))
 605             (when (coding-system-p cs)
 606               (decode-coding-region (point-min) (point-max) cs)
 607               (setq buffer-file-coding-system last-coding-system-used))))
 608         (when (fboundp 'html-mode)
 609           (html-mode))))
 610     (view-buffer buf)))
 611
 612 (defun eww-readable ()
 613   "View the main \"readable\" parts of the current web page.
 614 This command uses heuristics to find the parts of the web page that
 615 contains the main textual portion, leaving out navigation menus and
 616 the like."
 617   (interactive)
 618   (let* ((old-data eww-data)
 619          (dom (with-temp-buffer
 620                 (insert (plist-get old-data :source))
 621                 (condition-case nil
 622                     (decode-coding-region (point-min) (point-max) 'utf-8)
 623                   (coding-system-error nil))
 624                 (libxml-parse-html-region (point-min) (point-max)))))
 625     (eww-score-readability dom)
 626     (eww-save-history)
 627     (eww-display-html nil nil
 628                       (eww-highest-readability dom)
 629                       nil (current-buffer))
 630     (dolist (elem '(:source :url :title :next :previous :up))
 631       (plist-put eww-data elem (plist-get old-data elem)))
 632     (eww-update-header-line-format)))
 633
 634 (defun eww-score-readability (node)
 635   (let ((score -1))
 636     (cond
 637      ((memq (dom-tag node) '(script head comment))
 638       (setq score -2))
 639      ((eq (dom-tag node) 'meta)
 640       (setq score -1))
 641      ((eq (dom-tag node) 'img)
 642       (setq score 2))
 643      ((eq (dom-tag node) 'a)
 644       (setq score (- (length (split-string (dom-text node))))))
 645      (t
 646       (dolist (elem (dom-children node))
 647         (if (stringp elem)
 648             (setq score (+ score (length (split-string elem))))
 649           (setq score (+ score
 650                          (or (cdr (assoc :eww-readability-score (cdr elem)))
 651                              (eww-score-readability elem))))))))
 652     ;; Cache the score of the node to avoid recomputing all the time.
 653     (dom-set-attribute node :eww-readability-score score)
 654     score))
 655
 656 (defun eww-highest-readability (node)
 657   (let ((result node)
 658         highest)
 659     (dolist (elem (dom-non-text-children node))
 660       (when (> (or (dom-attr
 661                     (setq highest (eww-highest-readability elem))
 662                     :eww-readability-score)
 663                    most-negative-fixnum)
 664                (or (dom-attr result :eww-readability-score)
 665                    most-negative-fixnum))
 666         (setq result highest)))
 667     result))
 668
 669 (defvar eww-mode-map
 670   (let ((map (make-sparse-keymap)))
 671     (define-key map "g" 'eww-reload) ;FIXME: revert-buffer-function instead!
 672     (define-key map "G" 'eww)
 673     (define-key map [?\t] 'shr-next-link)
 674     (define-key map [?\M-\t] 'shr-previous-link)
 675     (define-key map [backtab] 'shr-previous-link)
 676     (define-key map [delete] 'scroll-down-command)
 677     (define-key map "l" 'eww-back-url)
 678     (define-key map "r" 'eww-forward-url)
 679     (define-key map "n" 'eww-next-url)
 680     (define-key map "p" 'eww-previous-url)
 681     (define-key map "u" 'eww-up-url)
 682     (define-key map "t" 'eww-top-url)
 683     (define-key map "&" 'eww-browse-with-external-browser)
 684     (define-key map "d" 'eww-download)
 685     (define-key map "w" 'eww-copy-page-url)
 686     (define-key map "C" 'url-cookie-list)
 687     (define-key map "v" 'eww-view-source)
 688     (define-key map "R" 'eww-readable)
 689     (define-key map "H" 'eww-list-histories)
 690     (define-key map "E" 'eww-set-character-encoding)
 691     (define-key map "S" 'eww-list-buffers)
 692     (define-key map "F" 'eww-toggle-fonts)
 693     (define-key map [(meta C)] 'eww-toggle-colors)
 694
 695     (define-key map "b" 'eww-add-bookmark)
 696     (define-key map "B" 'eww-list-bookmarks)
 697     (define-key map [(meta n)] 'eww-next-bookmark)
 698     (define-key map [(meta p)] 'eww-previous-bookmark)
 699
 700     (easy-menu-define nil map ""
 701       '("Eww"
 702         ["Exit" quit-window t]
 703         ["Close browser" quit-window t]
 704         ["Reload" eww-reload t]
 705         ["Back to previous page" eww-back-url
 706          :active (not (zerop (length eww-history)))]
 707         ["Forward to next page" eww-forward-url
 708          :active (not (zerop eww-history-position))]
 709         ["Browse with external browser" eww-browse-with-external-browser t]
 710         ["Download" eww-download t]
 711         ["View page source" eww-view-source]
 712         ["Copy page URL" eww-copy-page-url t]
 713         ["List histories" eww-list-histories t]
 714         ["List buffers" eww-list-buffers t]
 715         ["Add bookmark" eww-add-bookmark t]
 716         ["List bookmarks" eww-list-bookmarks t]
 717         ["List cookies" url-cookie-list t]
 718         ["Toggle fonts" eww-toggle-fonts t]
 719         ["Toggle colors" eww-toggle-colors t]
 720        ["Character Encoding" eww-set-character-encoding]))
 721     map))
 722
 723 (defvar eww-tool-bar-map
 724   (let ((map (make-sparse-keymap)))
 725     (dolist (tool-bar-item
 726              '((quit-window . "close")
 727                (eww-reload . "refresh")
 728                (eww-back-url . "left-arrow")
 729                (eww-forward-url . "right-arrow")
 730                (eww-view-source . "show")
 731                (eww-copy-page-url . "copy")
 732                (eww-add-bookmark . "bookmark_add"))) ;; ...
 733       (tool-bar-local-item-from-menu
 734        (car tool-bar-item) (cdr tool-bar-item) map eww-mode-map))
 735     map)
 736   "Tool bar for `eww-mode'.")
 737
 738 ;; Autoload cookie needed by desktop.el.
 739 ;;;###autoload
 740 (define-derived-mode eww-mode special-mode "eww"
 741   "Mode for browsing the web."
 742   (setq-local eww-data (list :title ""))
 743   (setq-local browse-url-browser-function #'eww-browse-url)
 744   (add-hook 'after-change-functions #'eww-process-text-input nil t)
 745   (setq-local eww-history nil)
 746   (setq-local eww-history-position 0)
 747   (when (boundp 'tool-bar-map)
 748     (setq-local tool-bar-map eww-tool-bar-map))
 749   ;; desktop support
 750   (setq-local desktop-save-buffer #'eww-desktop-misc-data)
 751   ;; multi-page isearch support
 752   (setq-local multi-isearch-next-buffer-function #'eww-isearch-next-buffer)
 753   (setq truncate-lines t)
 754   (buffer-disable-undo)
 755   (setq buffer-read-only t))
 756
 757 ;;;###autoload
 758 (defun eww-browse-url (url &optional new-window)
 759   (cond (new-window
 760          (switch-to-buffer (generate-new-buffer "*eww*"))
 761          (eww-mode)))
 762   (eww url))
 763
 764 (defun eww-back-url ()
 765   "Go to the previously displayed page."
 766   (interactive)
 767   (when (>= eww-history-position (length eww-history))
 768     (user-error "No previous page"))
 769   (eww-save-history)
 770   (setq eww-history-position (+ eww-history-position 2))
 771   (eww-restore-history (elt eww-history (1- eww-history-position))))
 772
 773 (defun eww-forward-url ()
 774   "Go to the next displayed page."
 775   (interactive)
 776   (when (zerop eww-history-position)
 777     (user-error "No next page"))
 778   (eww-save-history)
 779   (eww-restore-history (elt eww-history (1- eww-history-position))))
 780
 781 (defun eww-restore-history (elem)
 782   (let ((inhibit-read-only t)
 783         (inhibit-modification-hooks t)
 784         (text (plist-get elem :text)))
 785     (setq eww-data elem)
 786     (if (null text)
 787         (eww-reload)                    ; FIXME: restore :point?
 788       (erase-buffer)
 789       (insert text)
 790       (goto-char (plist-get elem :point))
 791       (eww-update-header-line-format))))
 792
 793 (defun eww-next-url ()
 794   "Go to the page marked `next'.
 795 A page is marked `next' if rel=\"next\" appears in a <link>
 796 or <a> tag."
 797   (interactive)
 798   (if (plist-get eww-data :next)
 799       (eww-browse-url (shr-expand-url (plist-get eww-data :next)
 800                                       (plist-get eww-data :url)))
 801     (user-error "No `next' on this page")))
 802
 803 (defun eww-previous-url ()
 804   "Go to the page marked `previous'.
 805 A page is marked `previous' if rel=\"previous\" appears in a <link>
 806 or <a> tag."
 807   (interactive)
 808   (if (plist-get eww-data :previous)
 809       (eww-browse-url (shr-expand-url (plist-get eww-data :previous)
 810                                       (plist-get eww-data :url)))
 811     (user-error "No `previous' on this page")))
 812
 813 (defun eww-up-url ()
 814   "Go to the page marked `up'.
 815 A page is marked `up' if rel=\"up\" appears in a <link>
 816 or <a> tag."
 817   (interactive)
 818   (if (plist-get eww-data :up)
 819       (eww-browse-url (shr-expand-url (plist-get eww-data :up)
 820                                       (plist-get eww-data :url)))
 821     (user-error "No `up' on this page")))
 822
 823 (defun eww-top-url ()
 824   "Go to the page marked `top'.
 825 A page is marked `top' if rel=\"start\", rel=\"home\", or rel=\"contents\"
 826 appears in a <link> or <a> tag."
 827   (interactive)
 828   (let ((best-url (or (plist-get eww-data :start)
 829                       (plist-get eww-data :contents)
 830                       (plist-get eww-data :home))))
 831     (if best-url
 832         (eww-browse-url (shr-expand-url best-url (plist-get eww-data :url)))
 833       (user-error "No `top' for this page"))))
 834
 835 (defun eww-reload (&optional local encode)
 836   "Reload the current page.
 837 If LOCAL (the command prefix), don't reload the page from the
 838 network, but just re-display the HTML already fetched."
 839   (interactive "P")
 840   (let ((url (plist-get eww-data :url)))
 841     (if local
 842         (if (null (plist-get eww-data :dom))
 843             (error "No current HTML data")
 844           (eww-display-html 'utf-8 url (plist-get eww-data :dom)
 845                             (point) (current-buffer)))
 846       (url-retrieve url 'eww-render
 847                     (list url (point) (current-buffer) encode)))))
 848
 849 ;; Form support.
 850
 851 (defvar eww-form nil)
 852
 853 (defvar eww-submit-map
 854   (let ((map (make-sparse-keymap)))
 855     (define-key map "\r" 'eww-submit)
 856     (define-key map [(control c) (control c)] 'eww-submit)
 857     map))
 858
 859 (defvar eww-submit-file
 860   (let ((map (make-sparse-keymap)))
 861     (define-key map "\r" 'eww-select-file)
 862     (define-key map [(control c) (control c)] 'eww-submit)
 863     map))
 864
 865 (defvar eww-checkbox-map
 866   (let ((map (make-sparse-keymap)))
 867     (define-key map " " 'eww-toggle-checkbox)
 868     (define-key map "\r" 'eww-toggle-checkbox)
 869     (define-key map [(control c) (control c)] 'eww-submit)
 870     map))
 871
 872 (defvar eww-text-map
 873   (let ((map (make-keymap)))
 874     (set-keymap-parent map text-mode-map)
 875     (define-key map "\r" 'eww-submit)
 876     (define-key map [(control a)] 'eww-beginning-of-text)
 877     (define-key map [(control c) (control c)] 'eww-submit)
 878     (define-key map [(control e)] 'eww-end-of-text)
 879     (define-key map [?\t] 'shr-next-link)
 880     (define-key map [?\M-\t] 'shr-previous-link)
 881     map))
 882
 883 (defvar eww-textarea-map
 884   (let ((map (make-keymap)))
 885     (set-keymap-parent map text-mode-map)
 886     (define-key map "\r" 'forward-line)
 887     (define-key map [(control c) (control c)] 'eww-submit)
 888     (define-key map [?\t] 'shr-next-link)
 889     (define-key map [?\M-\t] 'shr-previous-link)
 890     map))
 891
 892 (defvar eww-select-map
 893   (let ((map (make-sparse-keymap)))
 894     (define-key map "\r" 'eww-change-select)
 895     (define-key map [(control c) (control c)] 'eww-submit)
 896     map))
 897
 898 (defun eww-beginning-of-text ()
 899   "Move to the start of the input field."
 900   (interactive)
 901   (goto-char (eww-beginning-of-field)))
 902
 903 (defun eww-end-of-text ()
 904   "Move to the end of the text in the input field."
 905   (interactive)
 906   (goto-char (eww-end-of-field))
 907   (let ((start (eww-beginning-of-field)))
 908     (while (and (equal (following-char) ? )
 909                 (> (point) start))
 910       (forward-char -1))
 911     (when (> (point) start)
 912       (forward-char 1))))
 913
 914 (defun eww-beginning-of-field ()
 915   (cond
 916    ((bobp)
 917     (point))
 918    ((not (eq (get-text-property (point) 'eww-form)
 919              (get-text-property (1- (point)) 'eww-form)))
 920     (point))
 921    (t
 922     (previous-single-property-change
 923      (point) 'eww-form nil (point-min)))))
 924
 925 (defun eww-end-of-field ()
 926   (1- (next-single-property-change
 927        (point) 'eww-form nil (point-max))))
 928
 929 (defun eww-tag-form (dom)
 930   (let ((eww-form (list (cons :method (dom-attr dom 'method))
 931                         (cons :action (dom-attr dom 'action))))
 932         (start (point)))
 933     (shr-ensure-paragraph)
 934     (shr-generic dom)
 935     (unless (bolp)
 936       (insert "\n"))
 937     (insert "\n")
 938     (when (> (point) start)
 939       (put-text-property start (1+ start)
 940                          'eww-form eww-form))))
 941
 942 (defun eww-form-submit (dom)
 943   (let ((start (point))
 944         (value (dom-attr dom 'value)))
 945     (setq value
 946           (if (zerop (length value))
 947               "Submit"
 948             value))
 949     (insert value)
 950     (add-face-text-property start (point) 'eww-form-submit)
 951     (put-text-property start (point) 'eww-form
 952                        (list :eww-form eww-form
 953                              :value value
 954                              :type "submit"
 955                              :name (dom-attr dom 'name)))
 956     (put-text-property start (point) 'keymap eww-submit-map)
 957     (insert " ")))
 958
 959 (defun eww-form-checkbox (dom)
 960   (let ((start (point)))
 961     (if (dom-attr dom 'checked)
 962         (insert eww-form-checkbox-selected-symbol)
 963       (insert eww-form-checkbox-symbol))
 964     (add-face-text-property start (point) 'eww-form-checkbox)
 965     (put-text-property start (point) 'eww-form
 966                        (list :eww-form eww-form
 967                              :value (dom-attr dom 'value)
 968                              :type (downcase (dom-attr dom 'type))
 969                              :checked (dom-attr dom 'checked)
 970                              :name (dom-attr dom 'name)))
 971     (put-text-property start (point) 'keymap eww-checkbox-map)
 972     (insert " ")))
 973
 974 (defun eww-form-file (dom)
 975   (let ((start (point))
 976         (value (dom-attr dom 'value)))
 977     (setq value
 978           (if (zerop (length value))
 979               " No file selected"
 980             value))
 981     (insert "Browse")
 982     (add-face-text-property start (point) 'eww-form-file)
 983     (insert value)
 984     (put-text-property start (point) 'eww-form
 985                        (list :eww-form eww-form
 986                              :value (dom-attr dom 'value)
 987                              :type (downcase (dom-attr dom 'type))
 988                              :name (dom-attr dom 'name)))
 989     (put-text-property start (point) 'keymap eww-submit-file)
 990     (insert " ")))
 991
 992 (defun eww-select-file ()
 993   "Change the value of the upload file menu under point."
 994   (interactive)
 995   (let*  ((input (get-text-property (point) 'eww-form)))
 996     (let ((filename
 997            (let ((insert-default-directory t))
 998              (read-file-name "filename:  "))))
 999       (eww-update-field filename (length "Browse"))
1000               (plist-put input :filename filename))))
1001
1002 (defun eww-form-text (dom)
1003   (let ((start (point))
1004         (type (downcase (or (dom-attr dom 'type) "text")))
1005         (value (or (dom-attr dom 'value) ""))
1006         (width (string-to-number (or (dom-attr dom 'size) "40")))
1007         (readonly-property (if (or (dom-attr dom 'disabled)
1008                                    (dom-attr dom 'readonly))
1009                                'read-only
1010                              'inhibit-read-only)))
1011     (insert value)
1012     (when (< (length value) width)
1013       (insert (make-string (- width (length value)) ? )))
1014     (put-text-property start (point) 'face 'eww-form-text)
1015     (put-text-property start (point) 'inhibit-read-only t)
1016     (put-text-property start (point) 'local-map eww-text-map)
1017     (put-text-property start (point) readonly-property t)
1018     (put-text-property start (point) 'eww-form
1019                        (list :eww-form eww-form
1020                              :value value
1021                              :type type
1022                              :name (dom-attr dom 'name)))
1023     (insert " ")))
1024
1025 (defconst eww-text-input-types '("text" "password" "textarea"
1026                                  "color" "date" "datetime" "datetime-local"
1027                                  "email" "month" "number" "search" "tel"
1028                                  "time" "url" "week")
1029   "List of input types which represent a text input.
1030 See URL `https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Input'.")
1031
1032 (defun eww-process-text-input (beg end replace-length)
1033   (when-let (pos (and (< (1+ end) (point-max))
1034                       (> (1- end) (point-min))
1035                       (cond
1036                        ((get-text-property (1+ end) 'eww-form)
1037                         (1+ end))
1038                        ((get-text-property (1- end) 'eww-form)
1039                         (1- end)))))
1040     (let* ((form (get-text-property pos 'eww-form))
1041            (properties (text-properties-at pos))
1042            (inhibit-read-only t)
1043            (length (- end beg replace-length))
1044            (type (plist-get form :type)))
1045       (when (and form
1046                  (member type eww-text-input-types))
1047         (cond
1048          ((> length 0)
1049           ;; Delete some space at the end.
1050           (save-excursion
1051             (goto-char
1052              (if (equal type "textarea")
1053                  (1- (line-end-position))
1054                (eww-end-of-field)))
1055             (while (and (> length 0)
1056                         (eql (following-char) ? ))
1057               (delete-region (1- (point)) (point))
1058               (cl-decf length))))
1059          ((< length 0)
1060           ;; Add padding.
1061           (save-excursion
1062             (goto-char (1- end))
1063             (goto-char
1064              (if (equal type "textarea")
1065                  (1- (line-end-position))
1066                (1+ (eww-end-of-field))))
1067             (let ((start (point)))
1068               (insert (make-string (abs length) ? ))
1069               (set-text-properties start (point) properties))
1070             (goto-char (1- end)))))
1071         (set-text-properties (plist-get form :start) (plist-get form :end)
1072                              properties)
1073         (let ((value (buffer-substring-no-properties
1074                       (eww-beginning-of-field)
1075                       (eww-end-of-field))))
1076           (when (string-match " +\\'" value)
1077             (setq value (substring value 0 (match-beginning 0))))
1078           (plist-put form :value value)
1079           (when (equal type "password")
1080             ;; Display passwords as asterisks.
1081             (let ((start (eww-beginning-of-field)))
1082               (put-text-property start (+ start (length value))
1083                                  'display (make-string (length value) ?*)))))))))
1084
1085 (defun eww-tag-textarea (dom)
1086   (let ((start (point))
1087         (value (or (dom-attr dom 'value) ""))
1088         (lines (string-to-number (or (dom-attr dom 'rows) "10")))
1089         (width (string-to-number (or (dom-attr dom 'cols) "10")))
1090         end)
1091     (shr-ensure-newline)
1092     (insert value)
1093     (shr-ensure-newline)
1094     (when (< (count-lines start (point)) lines)
1095       (dotimes (_ (- lines (count-lines start (point))))
1096         (insert "\n")))
1097     (setq end (point-marker))
1098     (goto-char start)
1099     (while (< (point) end)
1100       (end-of-line)
1101       (let ((pad (- width (- (point) (line-beginning-position)))))
1102         (when (> pad 0)
1103           (insert (make-string pad ? ))))
1104       (add-face-text-property (line-beginning-position)
1105                               (point) 'eww-form-textarea)
1106       (put-text-property (line-beginning-position) (point) 'inhibit-read-only t)
1107       (put-text-property (line-beginning-position) (point)
1108                          'local-map eww-textarea-map)
1109       (forward-line 1))
1110     (put-text-property start (point) 'eww-form
1111                        (list :eww-form eww-form
1112                              :value value
1113                              :type "textarea"
1114                              :name (dom-attr dom 'name)))))
1115
1116 (defun eww-tag-input (dom)
1117   (let ((type (downcase (or (dom-attr dom 'type) "text")))
1118         (start (point)))
1119     (cond
1120      ((or (equal type "checkbox")
1121           (equal type "radio"))
1122       (eww-form-checkbox dom))
1123      ((equal type "file")
1124       (eww-form-file dom))
1125      ((equal type "submit")
1126       (eww-form-submit dom))
1127      ((equal type "hidden")
1128       (let ((form eww-form)
1129             (name (dom-attr dom 'name)))
1130         ;; Don't add <input type=hidden> elements repeatedly.
1131         (while (and form
1132                     (or (not (consp (car form)))
1133                         (not (eq (caar form) 'hidden))
1134                         (not (equal (plist-get (cdr (car form)) :name)
1135                                     name))))
1136           (setq form (cdr form)))
1137         (unless form
1138           (nconc eww-form (list
1139                            (list 'hidden
1140                                  :name name
1141                                  :value (dom-attr dom 'value)))))))
1142      (t
1143       (eww-form-text dom)))
1144     (unless (= start (point))
1145       (put-text-property start (1+ start) 'help-echo "Input field"))))
1146
1147 (defun eww-tag-select (dom)
1148   (shr-ensure-paragraph)
1149   (let ((menu (list :name (dom-attr dom 'name)
1150                     :eww-form eww-form))
1151         (options nil)
1152         (start (point))
1153         (max 0)
1154         opelem)
1155     (if (eq (dom-tag dom) 'optgroup)
1156         (dolist (groupelem (dom-children dom))
1157           (unless (dom-attr groupelem 'disabled)
1158             (setq opelem (append opelem (list groupelem)))))
1159       (setq opelem (list dom)))
1160     (dolist (elem opelem)
1161       (when (eq (dom-tag elem) 'option)
1162         (when (dom-attr elem 'selected)
1163           (nconc menu (list :value (dom-attr elem 'value))))
1164         (let ((display (dom-text elem)))
1165           (setq max (max max (length display)))
1166           (push (list 'item
1167                       :value (dom-attr elem 'value)
1168                       :display display)
1169                 options))))
1170     (when options
1171       (setq options (nreverse options))
1172       ;; If we have no selected values, default to the first value.
1173       (unless (plist-get menu :value)
1174         (nconc menu (list :value (nth 2 (car options)))))
1175       (nconc menu options)
1176       (let ((selected (eww-select-display menu)))
1177         (insert selected
1178                 (make-string (- max (length selected)) ? )))
1179       (put-text-property start (point) 'eww-form menu)
1180       (add-face-text-property start (point) 'eww-form-select)
1181       (put-text-property start (point) 'keymap eww-select-map)
1182       (unless (= start (point))
1183        (put-text-property start (1+ start) 'help-echo "select field"))
1184       (shr-ensure-paragraph))))
1185
1186 (defun eww-select-display (select)
1187   (let ((value (plist-get select :value))
1188         display)
1189     (dolist (elem select)
1190       (when (and (consp elem)
1191                  (eq (car elem) 'item)
1192                  (equal value (plist-get (cdr elem) :value)))
1193         (setq display (plist-get (cdr elem) :display))))
1194     display))
1195
1196 (defun eww-change-select ()
1197   "Change the value of the select drop-down menu under point."
1198   (interactive)
1199   (let* ((input (get-text-property (point) 'eww-form))
1200          (completion-ignore-case t)
1201          (options
1202           (delq nil
1203                 (mapcar (lambda (elem)
1204                           (and (consp elem)
1205                                (eq (car elem) 'item)
1206                                (cons (plist-get (cdr elem) :display)
1207                                      (plist-get (cdr elem) :value))))
1208                         input)))
1209          (display
1210           (completing-read "Change value: " options nil 'require-match))
1211          (inhibit-read-only t))
1212     (plist-put input :value (cdr (assoc-string display options t)))
1213     (goto-char
1214      (eww-update-field display))))
1215
1216 (defun eww-update-field (string &optional offset)
1217   (unless offset
1218     (setq offset 0))
1219   (let ((properties (text-properties-at (point)))
1220         (start (+ (eww-beginning-of-field) offset))
1221         (current-end (1+ (eww-end-of-field)))
1222         (new-end (+ (eww-beginning-of-field) (length string)))
1223         (inhibit-read-only t))
1224     (delete-region start current-end)
1225     (forward-char offset)
1226     (insert string
1227             (make-string (- (- (+ new-end offset) start) (length string)) ? ))
1228     (when (= 0 offset)
1229       (set-text-properties start new-end properties))
1230     start))
1231
1232 (defun eww-toggle-checkbox ()
1233   "Toggle the value of the checkbox under point."
1234   (interactive)
1235   (let* ((input (get-text-property (point) 'eww-form))
1236          (type (plist-get input :type)))
1237     (if (equal type "checkbox")
1238         (goto-char
1239          (1+
1240           (if (plist-get input :checked)
1241               (progn
1242                 (plist-put input :checked nil)
1243                 (eww-update-field eww-form-checkbox-symbol))
1244             (plist-put input :checked t)
1245             (eww-update-field eww-form-checkbox-selected-symbol))))
1246       ;; Radio button.  Switch all other buttons off.
1247       (let ((name (plist-get input :name)))
1248         (save-excursion
1249           (dolist (elem (eww-inputs (plist-get input :eww-form)))
1250             (when (equal (plist-get (cdr elem) :name) name)
1251               (goto-char (car elem))
1252               (if (not (eq (cdr elem) input))
1253                   (progn
1254                     (plist-put input :checked nil)
1255                     (eww-update-field eww-form-checkbox-symbol))
1256                 (plist-put input :checked t)
1257                 (eww-update-field eww-form-checkbox-selected-symbol)))))
1258         (forward-char 1)))))
1259
1260 (defun eww-inputs (form)
1261   (let ((start (point-min))
1262         (inputs nil))
1263     (while (and start
1264                 (< start (point-max)))
1265       (when (or (get-text-property start 'eww-form)
1266                 (setq start (next-single-property-change start 'eww-form)))
1267         (when (eq (plist-get (get-text-property start 'eww-form) :eww-form)
1268                   form)
1269           (push (cons start (get-text-property start 'eww-form))
1270                 inputs))
1271         (setq start (next-single-property-change start 'eww-form))))
1272     (nreverse inputs)))
1273
1274 (defun eww-size-text-inputs ()
1275   (let ((start (point-min)))
1276     (while (and start
1277                 (< start (point-max)))
1278       (when (or (get-text-property start 'eww-form)
1279                 (setq start (next-single-property-change start 'eww-form)))
1280         (let ((props (get-text-property start 'eww-form)))
1281           (plist-put props :start start)
1282           (setq start (next-single-property-change
1283                        start 'eww-form nil (point-max)))
1284           (plist-put props :end start))))))
1285
1286 (defun eww-input-value (input)
1287   (let ((type (plist-get input :type))
1288         (value (plist-get input :value)))
1289     (cond
1290      ((equal type "textarea")
1291       (with-temp-buffer
1292         (insert value)
1293         (goto-char (point-min))
1294         (while (re-search-forward "^ +\n\\| +$" nil t)
1295           (replace-match "" t t))
1296         (buffer-string)))
1297      (t
1298       (if (string-match " +\\'" value)
1299           (substring value 0 (match-beginning 0))
1300         value)))))
1301
1302 (defun eww-submit ()
1303   "Submit the current form."
1304   (interactive)
1305   (let* ((this-input (get-text-property (point) 'eww-form))
1306          (form (plist-get this-input :eww-form))
1307          values next-submit)
1308     (dolist (elem (sort (eww-inputs form)
1309                         (lambda (o1 o2)
1310                           (< (car o1) (car o2)))))
1311       (let* ((input (cdr elem))
1312              (input-start (car elem))
1313              (name (plist-get input :name)))
1314         (when name
1315           (cond
1316            ((member (plist-get input :type) '("checkbox" "radio"))
1317             (when (plist-get input :checked)
1318               (push (cons name (plist-get input :value))
1319                     values)))
1320            ((equal (plist-get input :type) "file")
1321             (push (cons "file"
1322                         (list (cons "filedata"
1323                                     (with-temp-buffer
1324                                       (insert-file-contents
1325                                        (plist-get input :filename))
1326                                       (buffer-string)))
1327                               (cons "name" (plist-get input :name))
1328                               (cons "filename" (plist-get input :filename))))
1329                   values))
1330            ((equal (plist-get input :type) "submit")
1331             ;; We want the values from buttons if we hit a button if
1332             ;; we hit enter on it, or if it's the first button after
1333             ;; the field we did hit return on.
1334             (when (or (eq input this-input)
1335                       (and (not (eq input this-input))
1336                            (null next-submit)
1337                            (> input-start (point))))
1338               (setq next-submit t)
1339               (push (cons name (plist-get input :value))
1340                     values)))
1341            (t
1342             (push (cons name (eww-input-value input))
1343                   values))))))
1344     (dolist (elem form)
1345       (when (and (consp elem)
1346                  (eq (car elem) 'hidden))
1347         (push (cons (plist-get (cdr elem) :name)
1348                     (or (plist-get (cdr elem) :value) ""))
1349               values)))
1350     (if (and (stringp (cdr (assq :method form)))
1351              (equal (downcase (cdr (assq :method form))) "post"))
1352         (let ((mtype))
1353           (dolist (x values mtype)
1354             (if (equal (car x) "file")
1355                 (progn
1356                   (setq mtype "multipart/form-data"))))
1357           (cond ((equal mtype "multipart/form-data")
1358                  (let ((boundary (mml-compute-boundary '())))
1359                    (let ((url-request-method "POST")
1360                          (url-request-extra-headers
1361                           (list (cons "Content-Type"
1362                                       (concat "multipart/form-data; boundary="
1363                                               boundary))))
1364                          (url-request-data
1365                           (mm-url-encode-multipart-form-data values boundary)))
1366                      (eww-browse-url (shr-expand-url
1367                                       (cdr (assq :action form))
1368                                       (plist-get eww-data :url))))))
1369                 (t
1370                  (let ((url-request-method "POST")
1371                        (url-request-extra-headers
1372                         '(("Content-Type" .
1373                            "application/x-www-form-urlencoded")))
1374                        (url-request-data
1375                         (mm-url-encode-www-form-urlencoded values)))
1376                    (eww-browse-url (shr-expand-url
1377                                     (cdr (assq :action form))
1378                                     (plist-get eww-data :url)))))))
1379       (eww-browse-url
1380        (concat
1381         (if (cdr (assq :action form))
1382             (shr-expand-url (cdr (assq :action form)) (plist-get eww-data :url))
1383           (plist-get eww-data :url))
1384         "?"
1385         (mm-url-encode-www-form-urlencoded values))))))
1386
1387 (defun eww-browse-with-external-browser (&optional url)
1388   "Browse the current URL with an external browser.
1389 The browser to used is specified by the `shr-external-browser' variable."
1390   (interactive)
1391   (funcall shr-external-browser (or url (plist-get eww-data :url))))
1392
1393 (defun eww-follow-link (&optional external mouse-event)
1394   "Browse the URL under point.
1395 If EXTERNAL is single prefix, browse the URL using `shr-external-browser'.
1396 If EXTERNAL is double prefix, browse in new buffer."
1397   (interactive (list current-prefix-arg last-nonmenu-event))
1398   (mouse-set-point mouse-event)
1399   (let ((url (get-text-property (point) 'shr-url)))
1400     (cond
1401      ((not url)
1402       (message "No link under point"))
1403      ((string-match "^mailto:" url)
1404       (browse-url-mail url))
1405      ((and (consp external) (<= (car external) 4))
1406       (funcall shr-external-browser url))
1407      ;; This is a #target url in the same page as the current one.
1408      ((and (url-target (url-generic-parse-url url))
1409            (eww-same-page-p url (plist-get eww-data :url)))
1410       (let ((dom (plist-get eww-data :dom)))
1411         (eww-save-history)
1412         (eww-display-html 'utf-8 url dom nil (current-buffer))))
1413      (t
1414       (eww-browse-url url external)))))
1415
1416 (defun eww-same-page-p (url1 url2)
1417   "Return non-nil if URL1 and URL2 represent the same page.
1418 Differences in #targets are ignored."
1419   (let ((obj1 (url-generic-parse-url url1))
1420         (obj2 (url-generic-parse-url url2)))
1421     (setf (url-target obj1) nil)
1422     (setf (url-target obj2) nil)
1423     (equal (url-recreate-url obj1) (url-recreate-url obj2))))
1424
1425 (defun eww-copy-page-url ()
1426   "Copy the URL of the current page into the kill ring."
1427   (interactive)
1428   (message "%s" (plist-get eww-data :url))
1429   (kill-new (plist-get eww-data :url)))
1430
1431 (defun eww-download ()
1432   "Download URL under point to `eww-download-directory'."
1433   (interactive)
1434   (let ((url (get-text-property (point) 'shr-url)))
1435     (if (not url)
1436         (message "No URL under point")
1437       (url-retrieve url 'eww-download-callback (list url)))))
1438
1439 (defun eww-download-callback (status url)
1440   (unless (plist-get status :error)
1441     (let* ((obj (url-generic-parse-url url))
1442            (path (car (url-path-and-query obj)))
1443            (file (eww-make-unique-file-name
1444                   (eww-decode-url-file-name (file-name-nondirectory path))
1445                   eww-download-directory)))
1446       (goto-char (point-min))
1447       (re-search-forward "\r?\n\r?\n")
1448       (write-region (point) (point-max) file)
1449       (message "Saved %s" file))))
1450
1451 (defun eww-decode-url-file-name (string)
1452   (let* ((binary (url-unhex-string string))
1453          (decoded
1454           (decode-coding-string
1455            binary
1456            ;; Possibly set by `universal-coding-system-argument'.
1457            (or coding-system-for-read
1458                ;; RFC 3986 says that %AB stuff is utf-8.
1459                (if (equal (decode-coding-string binary 'utf-8)
1460                           '(unicode))
1461                    'utf-8
1462                  ;; But perhaps not.
1463                  (car (detect-coding-string binary))))))
1464          (encodes (find-coding-systems-string decoded)))
1465     (if (or (equal encodes '(undecided))
1466             (memq (coding-system-base (or file-name-coding-system
1467                                           default-file-name-coding-system))
1468                   encodes))
1469         decoded
1470       ;; If we can't encode the decoded file name (due to language
1471       ;; environment settings), then we return the original, hexified
1472       ;; string.
1473       string)))
1474
1475 (defun eww-make-unique-file-name (file directory)
1476     (cond
1477      ((zerop (length file))
1478       (setq file "!"))
1479      ((string-match "\\`[.]" file)
1480       (setq file (concat "!" file))))
1481     (let ((count 1)
1482           (stem file)
1483           (suffix ""))
1484       (when (string-match "\\`\\(.*\\)\\([.][^.]+\\)" file)
1485         (setq stem (match-string 1)
1486               suffix (match-string 2)))
1487       (while (file-exists-p (expand-file-name file directory))
1488         (setq file (format "%s(%d)%s" stem count suffix))
1489         (setq count (1+ count)))
1490       (expand-file-name file directory)))
1491
1492 (defun eww-set-character-encoding (charset)
1493   "Set character encoding to CHARSET.
1494 If CHARSET is nil then use UTF-8."
1495   (interactive "zUse character set (default utf-8): ")
1496   (if (null charset)
1497       (eww-reload nil 'utf-8)
1498     (eww-reload nil charset)))
1499
1500 (defun eww-toggle-fonts ()
1501   "Toggle whether to use monospaced or font-enabled layouts."
1502   (interactive)
1503   (message "Fonts are now %s"
1504            (if (setq shr-use-fonts (not shr-use-fonts))
1505                "on"
1506              "off"))
1507   (eww-reload))
1508
1509 (defun eww-toggle-colors ()
1510   "Toggle whether to use HTML-specified colors or not."
1511   (interactive)
1512   (message "Colors are now %s"
1513            (if (setq shr-use-colors (not shr-use-colors))
1514                "on"
1515              "off"))
1516   (eww-reload))
1517
1518 ;;; Bookmarks code
1519
1520 (defvar eww-bookmarks nil)
1521
1522 (defun eww-add-bookmark ()
1523   "Bookmark the current page."
1524   (interactive)
1525   (eww-read-bookmarks)
1526   (dolist (bookmark eww-bookmarks)
1527     (when (equal (plist-get eww-data :url) (plist-get bookmark :url))
1528       (user-error "Already bookmarked")))
1529   (when (y-or-n-p "Bookmark this page?")
1530     (let ((title (replace-regexp-in-string "[\n\t\r]" " "
1531                                            (plist-get eww-data :title))))
1532       (setq title (replace-regexp-in-string "\\` +\\| +\\'" "" title))
1533       (push (list :url (plist-get eww-data :url)
1534                   :title title
1535                   :time (current-time-string))
1536             eww-bookmarks))
1537     (eww-write-bookmarks)
1538     (message "Bookmarked %s (%s)" (plist-get eww-data :url)
1539              (plist-get eww-data :title))))
1540
1541 (defun eww-write-bookmarks ()
1542   (with-temp-file (expand-file-name "eww-bookmarks" eww-bookmarks-directory)
1543     (insert ";; Auto-generated file; don't edit\n")
1544     (pp eww-bookmarks (current-buffer))))
1545
1546 (defun eww-read-bookmarks ()
1547   (let ((file (expand-file-name "eww-bookmarks" eww-bookmarks-directory)))
1548     (setq eww-bookmarks
1549           (unless (zerop (or (nth 7 (file-attributes file)) 0))
1550             (with-temp-buffer
1551               (insert-file-contents file)
1552               (read (current-buffer)))))))
1553
1554 ;;;###autoload
1555 (defun eww-list-bookmarks ()
1556   "Display the bookmarks."
1557   (interactive)
1558   (eww-bookmark-prepare)
1559   (pop-to-buffer "*eww bookmarks*"))
1560
1561 (defun eww-bookmark-prepare ()
1562   (eww-read-bookmarks)
1563   (unless eww-bookmarks
1564     (user-error "No bookmarks are defined"))
1565   (set-buffer (get-buffer-create "*eww bookmarks*"))
1566   (eww-bookmark-mode)
1567   (let* ((width (/ (window-width) 2))
1568          (format (format "%%-%ds %%s" width))
1569          (inhibit-read-only t)
1570          start title)
1571     (erase-buffer)
1572     (setq header-line-format (concat " " (format format "Title" "URL")))
1573     (dolist (bookmark eww-bookmarks)
1574       (setq start (point)
1575             title (plist-get bookmark :title))
1576       (when (> (length title) width)
1577         (setq title (truncate-string-to-width title width)))
1578       (insert (format format title (plist-get bookmark :url)) "\n")
1579       (put-text-property start (1+ start) 'eww-bookmark bookmark))
1580     (goto-char (point-min))))
1581
1582 (defvar eww-bookmark-kill-ring nil)
1583
1584 (defun eww-bookmark-kill ()
1585   "Kill the current bookmark."
1586   (interactive)
1587   (let* ((start (line-beginning-position))
1588          (bookmark (get-text-property start 'eww-bookmark))
1589          (inhibit-read-only t))
1590     (unless bookmark
1591       (user-error "No bookmark on the current line"))
1592     (forward-line 1)
1593     (push (buffer-substring start (point)) eww-bookmark-kill-ring)
1594     (delete-region start (point))
1595     (setq eww-bookmarks (delq bookmark eww-bookmarks))
1596     (eww-write-bookmarks)))
1597
1598 (defun eww-bookmark-yank ()
1599   "Yank a previously killed bookmark to the current line."
1600   (interactive)
1601   (unless eww-bookmark-kill-ring
1602     (user-error "No previously killed bookmark"))
1603   (beginning-of-line)
1604   (let ((inhibit-read-only t)
1605         (start (point))
1606         bookmark)
1607     (insert (pop eww-bookmark-kill-ring))
1608     (setq bookmark (get-text-property start 'eww-bookmark))
1609     (if (= start (point-min))
1610         (push bookmark eww-bookmarks)
1611       (let ((line (count-lines start (point))))
1612         (setcdr (nthcdr (1- line) eww-bookmarks)
1613                 (cons bookmark (nthcdr line eww-bookmarks)))))
1614     (eww-write-bookmarks)))
1615
1616 (defun eww-bookmark-browse ()
1617   "Browse the bookmark under point in eww."
1618   (interactive)
1619   (let ((bookmark (get-text-property (line-beginning-position) 'eww-bookmark)))
1620     (unless bookmark
1621       (user-error "No bookmark on the current line"))
1622     (quit-window)
1623     (eww-browse-url (plist-get bookmark :url))))
1624
1625 (defun eww-next-bookmark ()
1626   "Go to the next bookmark in the list."
1627   (interactive)
1628   (let ((first nil)
1629         bookmark)
1630     (unless (get-buffer "*eww bookmarks*")
1631       (setq first t)
1632       (eww-bookmark-prepare))
1633     (with-current-buffer (get-buffer "*eww bookmarks*")
1634       (when (and (not first)
1635                  (not (eobp)))
1636         (forward-line 1))
1637       (setq bookmark (get-text-property (line-beginning-position)
1638                                         'eww-bookmark))
1639       (unless bookmark
1640         (user-error "No next bookmark")))
1641     (eww-browse-url (plist-get bookmark :url))))
1642
1643 (defun eww-previous-bookmark ()
1644   "Go to the previous bookmark in the list."
1645   (interactive)
1646   (let ((first nil)
1647         bookmark)
1648     (unless (get-buffer "*eww bookmarks*")
1649       (setq first t)
1650       (eww-bookmark-prepare))
1651     (with-current-buffer (get-buffer "*eww bookmarks*")
1652       (if first
1653           (goto-char (point-max))
1654         (beginning-of-line))
1655       ;; On the final line.
1656       (when (eolp)
1657         (forward-line -1))
1658       (if (bobp)
1659           (user-error "No previous bookmark")
1660         (forward-line -1))
1661       (setq bookmark (get-text-property (line-beginning-position)
1662                                         'eww-bookmark)))
1663     (eww-browse-url (plist-get bookmark :url))))
1664
1665 (defvar eww-bookmark-mode-map
1666   (let ((map (make-sparse-keymap)))
1667     (define-key map [(control k)] 'eww-bookmark-kill)
1668     (define-key map [(control y)] 'eww-bookmark-yank)
1669     (define-key map "\r" 'eww-bookmark-browse)
1670
1671     (easy-menu-define nil map
1672       "Menu for `eww-bookmark-mode-map'."
1673       '("Eww Bookmark"
1674         ["Exit" quit-window t]
1675         ["Browse" eww-bookmark-browse
1676          :active (get-text-property (line-beginning-position) 'eww-bookmark)]
1677         ["Kill" eww-bookmark-kill
1678          :active (get-text-property (line-beginning-position) 'eww-bookmark)]
1679         ["Yank" eww-bookmark-yank
1680          :active eww-bookmark-kill-ring]))
1681     map))
1682
1683 (define-derived-mode eww-bookmark-mode special-mode "eww bookmarks"
1684   "Mode for listing bookmarks.
1685
1686 \\{eww-bookmark-mode-map}"
1687   (buffer-disable-undo)
1688   (setq truncate-lines t))
1689
1690 ;;; History code
1691
1692 (defun eww-save-history ()
1693   (plist-put eww-data :point (point))
1694   (plist-put eww-data :text (buffer-string))
1695   (push eww-data eww-history)
1696   (setq eww-data (list :title ""))
1697   ;; Don't let the history grow infinitely.  We store quite a lot of
1698   ;; data per page.
1699   (when-let (tail (and eww-history-limit
1700                        (nthcdr eww-history-limit eww-history)))
1701     (setcdr tail nil)))
1702
1703 (defvar eww-current-buffer)
1704
1705 (defun eww-list-histories ()
1706   "List the eww-histories."
1707   (interactive)
1708   (when (null eww-history)
1709     (error "No eww-histories are defined"))
1710   (let ((eww-history-trans eww-history)
1711         (buffer (current-buffer)))
1712     (set-buffer (get-buffer-create "*eww history*"))
1713     (eww-history-mode)
1714     (setq-local eww-current-buffer buffer)
1715     (let ((inhibit-read-only t)
1716           (domain-length 0)
1717           (title-length 0)
1718           url title format start)
1719       (erase-buffer)
1720       (dolist (history eww-history-trans)
1721         (setq start (point))
1722         (setq domain-length (max domain-length (length (plist-get history :url))))
1723         (setq title-length (max title-length (length (plist-get history :title)))))
1724       (setq format (format "%%-%ds %%-%ds" title-length domain-length)
1725             header-line-format
1726             (concat " " (format format "Title" "URL")))
1727       (dolist (history eww-history-trans)
1728         (setq start (point))
1729         (setq url (plist-get history :url))
1730         (setq title (plist-get history :title))
1731         (insert (format format title url))
1732         (insert "\n")
1733         (put-text-property start (1+ start) 'eww-history history))
1734       (goto-char (point-min)))
1735     (pop-to-buffer "*eww history*")))
1736
1737 (defun eww-history-browse ()
1738   "Browse the history under point in eww."
1739   (interactive)
1740   (let ((history (get-text-property (line-beginning-position) 'eww-history)))
1741     (unless history
1742       (error "No history on the current line"))
1743     (let ((buffer eww-current-buffer))
1744       (quit-window)
1745       (when buffer
1746         (switch-to-buffer buffer)))
1747     (eww-restore-history history)))
1748
1749 (defvar eww-history-mode-map
1750   (let ((map (make-sparse-keymap)))
1751     (define-key map "\r" 'eww-history-browse)
1752 ;;    (define-key map "n" 'next-error-no-select)
1753 ;;    (define-key map "p" 'previous-error-no-select)
1754
1755     (easy-menu-define nil map
1756       "Menu for `eww-history-mode-map'."
1757       '("Eww History"
1758         ["Exit" quit-window t]
1759         ["Browse" eww-history-browse
1760          :active (get-text-property (line-beginning-position) 'eww-history)]))
1761     map))
1762
1763 (define-derived-mode eww-history-mode special-mode "eww history"
1764   "Mode for listing eww-histories.
1765
1766 \\{eww-history-mode-map}"
1767   (buffer-disable-undo)
1768   (setq truncate-lines t))
1769
1770 ;;; eww buffers list
1771
1772 (defun eww-list-buffers ()
1773   "Enlist eww buffers."
1774   (interactive)
1775   (let (buffers-info
1776         (current (current-buffer)))
1777     (dolist (buffer (buffer-list))
1778       (with-current-buffer buffer
1779         (when (derived-mode-p 'eww-mode)
1780           (push (vector buffer (plist-get eww-data :title)
1781                         (plist-get eww-data :url))
1782                 buffers-info))))
1783     (unless buffers-info
1784       (error "No eww buffers"))
1785     (setq buffers-info (nreverse buffers-info)) ;more recent on top
1786     (set-buffer (get-buffer-create "*eww buffers*"))
1787     (eww-buffers-mode)
1788     (let ((inhibit-read-only t)
1789           (domain-length 0)
1790           (title-length 0)
1791           url title format start)
1792       (erase-buffer)
1793       (dolist (buffer-info buffers-info)
1794         (setq title-length (max title-length
1795                                 (length (elt buffer-info 1)))
1796               domain-length (max domain-length
1797                                  (length (elt buffer-info 2)))))
1798       (setq format (format "%%-%ds %%-%ds" title-length domain-length)
1799             header-line-format
1800             (concat " " (format format "Title" "URL")))
1801       (let ((line 0)
1802             (current-buffer-line 1))
1803         (dolist (buffer-info buffers-info)
1804           (setq start (point)
1805                 title (elt buffer-info 1)
1806                 url (elt buffer-info 2)
1807                 line (1+ line))
1808           (insert (format format title url))
1809           (insert "\n")
1810           (let ((buffer (elt buffer-info 0)))
1811             (put-text-property start (1+ start) 'eww-buffer
1812                                buffer)
1813             (when (eq current buffer)
1814               (setq current-buffer-line line))))
1815         (goto-char (point-min))
1816         (forward-line (1- current-buffer-line)))))
1817   (pop-to-buffer "*eww buffers*"))
1818
1819 (defun eww-buffer-select ()
1820   "Switch to eww buffer."
1821   (interactive)
1822   (let ((buffer (get-text-property (line-beginning-position)
1823                                    'eww-buffer)))
1824     (unless buffer
1825       (error "No buffer on current line"))
1826     (quit-window)
1827     (switch-to-buffer buffer)))
1828
1829 (defun eww-buffer-show ()
1830   "Display buffer under point in eww buffer list."
1831   (let ((buffer (get-text-property (line-beginning-position)
1832                                    'eww-buffer)))
1833     (unless buffer
1834       (error "No buffer on current line"))
1835     (other-window -1)
1836     (switch-to-buffer buffer)
1837     (other-window 1)))
1838
1839 (defun eww-buffer-show-next ()
1840   "Move to next eww buffer in the list and display it."
1841   (interactive)
1842   (forward-line)
1843   (when (eobp)
1844     (goto-char (point-min)))
1845   (eww-buffer-show))
1846
1847 (defun eww-buffer-show-previous ()
1848   "Move to previous eww buffer in the list and display it."
1849   (interactive)
1850   (beginning-of-line)
1851   (when (bobp)
1852     (goto-char (point-max)))
1853   (forward-line -1)
1854   (eww-buffer-show))
1855
1856 (defun eww-buffer-kill ()
1857   "Kill buffer from eww list."
1858   (interactive)
1859   (let* ((start (line-beginning-position))
1860          (buffer (get-text-property start 'eww-buffer))
1861          (inhibit-read-only t))
1862     (unless buffer
1863       (user-error "No buffer on the current line"))
1864     (kill-buffer buffer)
1865     (forward-line 1)
1866     (delete-region start (point)))
1867   (when (eobp)
1868     (forward-line -1))
1869   (eww-buffer-show))
1870
1871 (defvar eww-buffers-mode-map
1872   (let ((map (make-sparse-keymap)))
1873     (define-key map [(control k)] 'eww-buffer-kill)
1874     (define-key map "\r" 'eww-buffer-select)
1875     (define-key map "n" 'eww-buffer-show-next)
1876     (define-key map "p" 'eww-buffer-show-previous)
1877
1878     (easy-menu-define nil map
1879       "Menu for `eww-buffers-mode-map'."
1880       '("Eww Buffers"
1881         ["Exit" quit-window t]
1882         ["Select" eww-buffer-select
1883          :active (get-text-property (line-beginning-position) 'eww-buffer)]
1884         ["Kill" eww-buffer-kill
1885          :active (get-text-property (line-beginning-position) 'eww-buffer)]))
1886     map))
1887
1888 (define-derived-mode eww-buffers-mode special-mode "eww buffers"
1889   "Mode for listing buffers.
1890
1891 \\{eww-buffers-mode-map}"
1892   (buffer-disable-undo)
1893   (setq truncate-lines t))
1894
1895 ;;; Desktop support
1896
1897 (defvar eww-desktop-data-save
1898   '(:url :title :point)
1899   "List of `eww-data' properties to preserve in the desktop file.
1900 Also used when saving `eww-history'.")
1901
1902 (defun eww-desktop-data-1 (alist)
1903   (let ((acc  nil)
1904         (tail alist))
1905     (while tail
1906       (let ((k (car  tail))
1907             (v (cadr tail)))
1908         (when (memq k eww-desktop-data-save)
1909           (setq acc (cons k (cons v acc)))))
1910       (setq tail  (cddr tail)))
1911     acc))
1912
1913 (defun eww-desktop-history-duplicate (a b)
1914   (let ((tail a) (r t))
1915     (while tail
1916       (if (or (memq (car tail) '(:point)) ; ignore :point
1917               (equal (cadr tail)
1918                      (plist-get b (car tail))))
1919           (setq tail (cddr tail))
1920         (setq tail nil
1921               r    nil)))
1922     ;; .
1923     r))
1924
1925 (defun eww-desktop-misc-data (_directory)
1926   "Return a property list with data used to restore eww buffers.
1927 This list will contain, as :history, the list, whose first element is
1928 the value of `eww-data', and the tail is `eww-history'.
1929
1930 If `eww-desktop-remove-duplicates' is non-nil, duplicate
1931 entries (if any) will be removed from the list.
1932
1933 Only the properties listed in `eww-desktop-data-save' are included.
1934 Generally, the list should not include the (usually overly large)
1935 :dom, :source and :text properties."
1936   (let ((history  (mapcar 'eww-desktop-data-1
1937                           (cons eww-data eww-history))))
1938     (list :history  (if eww-desktop-remove-duplicates
1939                         (cl-remove-duplicates
1940                          history :test 'eww-desktop-history-duplicate)
1941                       history))))
1942
1943 (defun eww-restore-desktop (file-name buffer-name misc-data)
1944   "Restore an eww buffer from its desktop file record.
1945 If `eww-restore-desktop' is t or `auto', this function will also
1946 initiate the retrieval of the respective URI in the background.
1947 Otherwise, the restored buffer will contain a prompt to do so by using
1948 \\[eww-reload]."
1949   (with-current-buffer (get-buffer-create buffer-name)
1950     (eww-mode)
1951     ;; NB: eww-history, eww-data are buffer-local per (eww-mode)
1952     (setq eww-history       (cdr (plist-get misc-data :history))
1953           eww-data      (or (car (plist-get misc-data :history))
1954                             ;; backwards compatibility
1955                             (list :url (plist-get misc-data :uri))))
1956     (unless file-name
1957       (when (plist-get eww-data :url)
1958         (case eww-restore-desktop
1959           ((t auto) (eww (plist-get eww-data :url)))
1960           ((zerop (buffer-size))
1961            (let ((inhibit-read-only t))
1962              (insert (substitute-command-keys
1963                       eww-restore-reload-prompt)))))))
1964     ;; .
1965     (current-buffer)))
1966
1967 (add-to-list 'desktop-locals-to-save
1968              'eww-history-position)
1969 (add-to-list 'desktop-buffer-mode-handlers
1970              '(eww-mode . eww-restore-desktop))
1971
1972 ;;; Isearch support
1973
1974 (defun eww-isearch-next-buffer (&optional _buffer wrap)
1975   "Go to the next page to search using `rel' attribute for navigation."
1976   (if wrap
1977       (condition-case nil
1978           (eww-top-url)
1979         (error nil))
1980     (if isearch-forward
1981         (eww-next-url)
1982       (eww-previous-url)))
1983   (current-buffer))
1984
1985 (provide 'eww)
1986
1987 ;;; eww.el ends here