lisp/net/eww.el

   1 ;;; eww.el --- Emacs Web Wowser
   2
   3 ;; Copyright (C) 2013 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 'mm-url)
  32
  33 (defgroup eww nil
  34   "Emacs Web Wowser"
  35   :version "24.4"
  36   :group 'hypermedia
  37   :prefix "eww-")
  38
  39 (defcustom eww-header-line-format "%t: %u"
  40   "Header line format.
  41 - %t is replaced by the title.
  42 - %u is replaced by the URL."
  43   :group 'eww
  44   :type 'string)
  45
  46 (defface eww-form-submit
  47   '((((type x w32 ns) (class color))    ; Like default mode line
  48      :box (:line-width 2 :style released-button)
  49      :background "#808080" :foreground "black"))
  50   "Face for eww buffer buttons."
  51   :version "24.4"
  52   :group 'eww)
  53
  54 (defface eww-form-checkbox
  55   '((((type x w32 ns) (class color))    ; Like default mode line
  56      :box (:line-width 2 :style released-button)
  57      :background "lightgrey" :foreground "black"))
  58   "Face for eww buffer buttons."
  59   :version "24.4"
  60   :group 'eww)
  61
  62 (defface eww-form-select
  63   '((((type x w32 ns) (class color))    ; Like default mode line
  64      :box (:line-width 2 :style released-button)
  65      :background "lightgrey" :foreground "black"))
  66   "Face for eww buffer buttons."
  67   :version "24.4"
  68   :group 'eww)
  69
  70 (defface eww-form-text
  71   '((t (:background "#505050"
  72                     :foreground "white"
  73                     :box (:line-width 1))))
  74   "Face for eww text inputs."
  75   :version "24.4"
  76   :group 'eww)
  77
  78 (defvar eww-current-url nil)
  79 (defvar eww-current-title ""
  80   "Title of current page.")
  81 (defvar eww-history nil)
  82
  83 (defvar eww-next-url nil)
  84 (defvar eww-previous-url nil)
  85 (defvar eww-up-url nil)
  86 (defvar eww-home-url nil)
  87 (defvar eww-start-url nil)
  88 (defvar eww-contents-url nil)
  89
  90 ;;;###autoload
  91 (defun eww (url)
  92   "Fetch URL and render the page."
  93   (interactive "sUrl: ")
  94   (unless (string-match-p "\\`[a-zA-Z][-a-zA-Z0-9+.]*://" url)
  95     (setq url (concat "http://" url)))
  96   (url-retrieve url 'eww-render (list url)))
  97
  98 ;;;###autoload
  99 (defun eww-open-file (file)
 100   "Render a file using EWW."
 101   (interactive "fFile: ")
 102   (eww (concat "file://" (expand-file-name file))))
 103
 104 (defun eww-render (status url &optional point)
 105   (let ((redirect (plist-get status :redirect)))
 106     (when redirect
 107       (setq url redirect)))
 108   (set (make-local-variable 'eww-next-url) nil)
 109   (set (make-local-variable 'eww-previous-url) nil)
 110   (set (make-local-variable 'eww-up-url) nil)
 111   (set (make-local-variable 'eww-home-url) nil)
 112   (set (make-local-variable 'eww-start-url) nil)
 113   (set (make-local-variable 'eww-contents-url) nil)
 114   (let* ((headers (eww-parse-headers))
 115          (shr-target-id
 116           (and (string-match "#\\(.*\\)" url)
 117                (match-string 1 url)))
 118          (content-type
 119           (mail-header-parse-content-type
 120            (or (cdr (assoc "content-type" headers))
 121                "text/plain")))
 122          (charset (intern
 123                    (downcase
 124                     (or (cdr (assq 'charset (cdr content-type)))
 125                         (eww-detect-charset (equal (car content-type)
 126                                                    "text/html"))
 127                         "utf8"))))
 128          (data-buffer (current-buffer)))
 129     (unwind-protect
 130         (progn
 131           (cond
 132            ((equal (car content-type) "text/html")
 133             (eww-display-html charset url))
 134            ((string-match "^image/" (car content-type))
 135             (eww-display-image))
 136            (t
 137             (eww-display-raw charset)))
 138           (cond
 139            (point
 140             (goto-char point))
 141            (shr-target-id
 142             (let ((point (next-single-property-change
 143                           (point-min) 'shr-target-id)))
 144               (when point
 145                 (goto-char (1+ point)))))))
 146       (kill-buffer data-buffer))))
 147
 148 (defun eww-parse-headers ()
 149   (let ((headers nil))
 150     (goto-char (point-min))
 151     (while (and (not (eobp))
 152                 (not (eolp)))
 153       (when (looking-at "\\([^:]+\\): *\\(.*\\)")
 154         (push (cons (downcase (match-string 1))
 155                     (match-string 2))
 156               headers))
 157       (forward-line 1))
 158     (unless (eobp)
 159       (forward-line 1))
 160     headers))
 161
 162 (defun eww-detect-charset (html-p)
 163   (let ((case-fold-search t)
 164         (pt (point)))
 165     (or (and html-p
 166              (re-search-forward
 167               "<meta[\t\n\r ]+[^>]*charset=\"?\\([^\t\n\r \"/>]+\\)" nil t)
 168              (goto-char pt)
 169              (match-string 1))
 170         (and (looking-at
 171               "[\t\n\r ]*<\\?xml[\t\n\r ]+[^>]*encoding=\"\\([^\"]+\\)")
 172              (match-string 1)))))
 173
 174 (defun eww-display-html (charset url)
 175   (unless (eq charset 'utf8)
 176     (decode-coding-region (point) (point-max) charset))
 177   (let ((document
 178          (list
 179           'base (list (cons 'href url))
 180           (libxml-parse-html-region (point) (point-max)))))
 181     (eww-setup-buffer)
 182     (setq eww-current-url url)
 183     (eww-update-header-line-format)
 184     (let ((inhibit-read-only t)
 185           (after-change-functions nil)
 186           (shr-width nil)
 187           (shr-external-rendering-functions
 188            '((title . eww-tag-title)
 189              (form . eww-tag-form)
 190              (input . eww-tag-input)
 191              (textarea . eww-tag-textarea)
 192              (body . eww-tag-body)
 193              (select . eww-tag-select)
 194              (link . eww-tag-link)
 195              (a . eww-tag-a))))
 196       (shr-insert-document document))
 197     (goto-char (point-min))))
 198
 199 (defun eww-handle-link (cont)
 200   (let* ((rel (assq :rel cont))
 201         (href (assq :href cont))
 202         (where (assoc
 203                 ;; The text associated with :rel is case-insensitive.
 204                 (if rel (downcase (cdr rel)))
 205                       '(("next" . eww-next-url)
 206                         ;; Texinfo uses "previous", but HTML specifies
 207                         ;; "prev", so recognize both.
 208                         ("previous" . eww-previous-url)
 209                         ("prev" . eww-previous-url)
 210                         ;; HTML specifies "start" but also "contents",
 211                         ;; and Gtk seems to use "home".  Recognize
 212                         ;; them all; but store them in different
 213                         ;; variables so that we can readily choose the
 214                         ;; "best" one.
 215                         ("start" . eww-start-url)
 216                         ("home" . eww-home-url)
 217                         ("contents" . eww-contents-url)
 218                         ("up" . eww-up-url)))))
 219     (and href
 220          where
 221          (set (cdr where) (cdr href)))))
 222
 223 (defun eww-tag-link (cont)
 224   (eww-handle-link cont)
 225   (shr-generic cont))
 226
 227 (defun eww-tag-a (cont)
 228   (eww-handle-link cont)
 229   (shr-tag-a cont))
 230
 231 (defun eww-update-header-line-format ()
 232   (if eww-header-line-format
 233       (setq header-line-format
 234             (replace-regexp-in-string
 235              "%" "%%"
 236              (format-spec eww-header-line-format
 237                           `((?u . ,eww-current-url)
 238                             (?t . ,eww-current-title)))))
 239     (setq header-line-format nil)))
 240
 241 (defun eww-tag-title (cont)
 242   (setq eww-current-title "")
 243   (dolist (sub cont)
 244     (when (eq (car sub) 'text)
 245       (setq eww-current-title (concat eww-current-title (cdr sub)))))
 246   (eww-update-header-line-format))
 247
 248 (defun eww-tag-body (cont)
 249   (let* ((start (point))
 250          (fgcolor (cdr (or (assq :fgcolor cont)
 251                            (assq :text cont))))
 252          (bgcolor (cdr (assq :bgcolor cont)))
 253          (shr-stylesheet (list (cons 'color fgcolor)
 254                                (cons 'background-color bgcolor))))
 255     (shr-generic cont)
 256     (eww-colorize-region start (point) fgcolor bgcolor)))
 257
 258 (defun eww-colorize-region (start end fg &optional bg)
 259   (when (or fg bg)
 260     (let ((new-colors (shr-color-check fg bg)))
 261       (when new-colors
 262         (when fg
 263           (add-face-text-property start end
 264                                   (list :foreground (cadr new-colors))
 265                                   t))
 266         (when bg
 267           (add-face-text-property start end
 268                                   (list :background (car new-colors))
 269                                   t))))))
 270
 271 (defun eww-display-raw (charset)
 272   (let ((data (buffer-substring (point) (point-max))))
 273     (eww-setup-buffer)
 274     (let ((inhibit-read-only t))
 275       (insert data))
 276     (goto-char (point-min))))
 277
 278 (defun eww-display-image ()
 279   (let ((data (buffer-substring (point) (point-max))))
 280     (eww-setup-buffer)
 281     (let ((inhibit-read-only t))
 282       (shr-put-image data nil))
 283     (goto-char (point-min))))
 284
 285 (defun eww-setup-buffer ()
 286   (pop-to-buffer (get-buffer-create "*eww*"))
 287   (remove-overlays)
 288   (let ((inhibit-read-only t))
 289     (erase-buffer))
 290   (eww-mode))
 291
 292 (defvar eww-mode-map
 293   (let ((map (make-sparse-keymap)))
 294     (suppress-keymap map)
 295     (define-key map "q" 'eww-quit)
 296     (define-key map "g" 'eww-reload)
 297     (define-key map [tab] 'shr-next-link)
 298     (define-key map [backtab] 'shr-previous-link)
 299     (define-key map [delete] 'scroll-down-command)
 300     (define-key map "\177" 'scroll-down-command)
 301     (define-key map " " 'scroll-up-command)
 302     (define-key map "l" 'eww-back-url)
 303     (define-key map "n" 'eww-next-url)
 304     (define-key map "p" 'eww-previous-url)
 305     (define-key map "u" 'eww-up-url)
 306     (define-key map "t" 'eww-top-url)
 307     map))
 308
 309 (define-derived-mode eww-mode nil "eww"
 310   "Mode for browsing the web.
 311
 312 \\{eww-mode-map}"
 313   (set (make-local-variable 'eww-current-url) 'author)
 314   (set (make-local-variable 'browse-url-browser-function) 'eww-browse-url)
 315   (set (make-local-variable 'after-change-functions) 'eww-process-text-input)
 316   ;;(setq buffer-read-only t)
 317   )
 318
 319 (defun eww-browse-url (url &optional new-window)
 320   (when (and (equal major-mode 'eww-mode)
 321              eww-current-url)
 322     (push (list eww-current-url (point))
 323           eww-history))
 324   (eww url))
 325
 326 (defun eww-quit ()
 327   "Exit the Emacs Web Wowser."
 328   (interactive)
 329   (setq eww-history nil)
 330   (kill-buffer (current-buffer)))
 331
 332 (defun eww-back-url ()
 333   "Go to the previously displayed page."
 334   (interactive)
 335   (when (zerop (length eww-history))
 336     (error "No previous page"))
 337   (let ((prev (pop eww-history)))
 338     (url-retrieve (car prev) 'eww-render (list (car prev) (cadr prev)))))
 339
 340 (defun eww-next-url ()
 341   "Go to the page marked `next'.
 342 A page is marked `next' if rel=\"next\" appears in a <link>
 343 or <a> tag."
 344   (interactive)
 345   (if eww-next-url
 346       (eww-browse-url (shr-expand-url eww-next-url eww-current-url))
 347     (error "No `next' on this page")))
 348
 349 (defun eww-previous-url ()
 350   "Go to the page marked `previous'.
 351 A page is marked `previous' if rel=\"previous\" appears in a <link>
 352 or <a> tag."
 353   (interactive)
 354   (if eww-previous-url
 355       (eww-browse-url (shr-expand-url eww-previous-url eww-current-url))
 356     (error "No `previous' on this page")))
 357
 358 (defun eww-up-url ()
 359   "Go to the page marked `up'.
 360 A page is marked `up' if rel=\"up\" appears in a <link>
 361 or <a> tag."
 362   (interactive)
 363   (if eww-up-url
 364       (eww-browse-url (shr-expand-url eww-up-url eww-current-url))
 365     (error "No `up' on this page")))
 366
 367 (defun eww-top-url ()
 368   "Go to the page marked `top'.
 369 A page is marked `top' if rel=\"start\", rel=\"home\", or rel=\"contents\"
 370 appears in a <link> or <a> tag."
 371   (interactive)
 372   (let ((best-url (or eww-start-url
 373                       eww-contents-url
 374                       eww-home-url)))
 375     (if best-url
 376         (eww-browse-url (shr-expand-url best-url eww-current-url))
 377       (error "No `top' for this page"))))
 378
 379 (defun eww-reload ()
 380   "Reload the current page."
 381   (interactive)
 382   (url-retrieve eww-current-url 'eww-render
 383                 (list eww-current-url (point))))
 384
 385 ;; Form support.
 386
 387 (defvar eww-form nil)
 388
 389 (defvar eww-submit-map
 390   (let ((map (make-sparse-keymap)))
 391     (define-key map "\r" 'eww-submit)
 392     map))
 393
 394 (defvar eww-checkbox-map
 395   (let ((map (make-sparse-keymap)))
 396     (define-key map [space] 'eww-toggle-checkbox)
 397     (define-key map "\r" 'eww-toggle-checkbox)
 398     map))
 399
 400 (defvar eww-text-map
 401   (let ((map (make-keymap)))
 402     (set-keymap-parent map text-mode-map)
 403     (define-key map "\r" 'eww-submit)
 404     (define-key map [(control a)] 'eww-beginning-of-text)
 405     (define-key map [(control e)] 'eww-end-of-text)
 406     (define-key map [tab] 'shr-next-link)
 407     (define-key map [backtab] 'shr-previous-link)
 408     map))
 409
 410 (defvar eww-textarea-map
 411   (let ((map (make-keymap)))
 412     (set-keymap-parent map text-mode-map)
 413     (define-key map "\r" 'forward-line)
 414     (define-key map [tab] 'shr-next-link)
 415     (define-key map [backtab] 'shr-previous-link)
 416     map))
 417
 418 (defvar eww-select-map
 419   (let ((map (make-sparse-keymap)))
 420     (define-key map "\r" 'eww-change-select)
 421     map))
 422
 423 (defun eww-beginning-of-text ()
 424   "Move to the start of the input field."
 425   (interactive)
 426   (goto-char (eww-beginning-of-field)))
 427
 428 (defun eww-end-of-text ()
 429   "Move to the end of the text in the input field."
 430   (interactive)
 431   (goto-char (eww-end-of-field))
 432   (let ((start (eww-beginning-of-field)))
 433     (while (and (equal (following-char) ? )
 434                 (> (point) start))
 435       (forward-char -1))
 436     (when (> (point) start)
 437       (forward-char 1))))
 438
 439 (defun eww-beginning-of-field ()
 440   (cond
 441    ((bobp)
 442     (point))
 443    ((not (eq (get-text-property (point) 'eww-form)
 444              (get-text-property (1- (point)) 'eww-form)))
 445     (point))
 446    (t
 447     (previous-single-property-change
 448      (point) 'eww-form nil (point-min)))))
 449
 450 (defun eww-end-of-field ()
 451   (1- (next-single-property-change
 452        (point) 'eww-form nil (point-max))))
 453
 454 (defun eww-tag-form (cont)
 455   (let ((eww-form
 456          (list (assq :method cont)
 457                (assq :action cont)))
 458         (start (point)))
 459     (shr-ensure-paragraph)
 460     (shr-generic cont)
 461     (unless (bolp)
 462       (insert "\n"))
 463     (insert "\n")
 464     (when (> (point) start)
 465       (put-text-property start (1+ start)
 466                          'eww-form eww-form))))
 467
 468 (defun eww-form-submit (cont)
 469   (let ((start (point))
 470         (value (cdr (assq :value cont))))
 471     (setq value
 472           (if (zerop (length value))
 473               "Submit"
 474             value))
 475     (insert value)
 476     (add-face-text-property start (point) 'eww-form-submit)
 477     (put-text-property start (point) 'eww-form
 478                        (list :eww-form eww-form
 479                              :value value
 480                              :type "submit"
 481                              :name (cdr (assq :name cont))))
 482     (put-text-property start (point) 'keymap eww-submit-map)
 483     (insert " ")))
 484
 485 (defun eww-form-checkbox (cont)
 486   (let ((start (point)))
 487     (if (cdr (assq :checked cont))
 488         (insert "[X]")
 489       (insert "[ ]"))
 490     (add-face-text-property start (point) 'eww-form-checkbox)
 491     (put-text-property start (point) 'eww-form
 492                        (list :eww-form eww-form
 493                              :value (cdr (assq :value cont))
 494                              :type (downcase (cdr (assq :type cont)))
 495                              :checked (cdr (assq :checked cont))
 496                              :name (cdr (assq :name cont))))
 497     (put-text-property start (point) 'keymap eww-checkbox-map)
 498     (insert " ")))
 499
 500 (defun eww-form-text (cont)
 501   (let ((start (point))
 502         (type (downcase (or (cdr (assq :type cont))
 503                             "text")))
 504         (value (or (cdr (assq :value cont)) ""))
 505         (width (string-to-number
 506                 (or (cdr (assq :size cont))
 507                     "40"))))
 508     (insert value)
 509     (when (< (length value) width)
 510       (insert (make-string (- width (length value)) ? )))
 511     (put-text-property start (point) 'face 'eww-form-text)
 512     (put-text-property start (point) 'local-map eww-text-map)
 513     (put-text-property start (point) 'inhibit-read-only t)
 514     (put-text-property start (point) 'eww-form
 515                        (list :eww-form eww-form
 516                              :value value
 517                              :type type
 518                              :name (cdr (assq :name cont))))
 519     (insert " ")))
 520
 521 (defun eww-process-text-input (beg end length)
 522   (let* ((form (get-text-property end 'eww-form))
 523          (properties (text-properties-at end))
 524          (type (plist-get form :type)))
 525     (when (and form
 526                (member type '("text" "password" "textarea")))
 527       (cond
 528        ((zerop length)
 529         ;; Delete some space at the end.
 530         (save-excursion
 531           (goto-char
 532            (if (equal type "textarea")
 533                (1- (line-end-position))
 534              (eww-end-of-field)))
 535           (let ((new (- end beg)))
 536             (while (and (> new 0)
 537                         (eql (following-char) ? ))
 538               (delete-region (point) (1+ (point)))
 539               (setq new (1- new))))
 540           (set-text-properties beg end properties)))
 541        ((> length 0)
 542         ;; Add padding.
 543         (save-excursion
 544           (goto-char
 545            (if (equal type "textarea")
 546                (1- (line-end-position))
 547              (eww-end-of-field)))
 548           (let ((start (point)))
 549             (insert (make-string length ? ))
 550             (set-text-properties start (point) properties)))))
 551       (let ((value (buffer-substring-no-properties
 552                     (eww-beginning-of-field)
 553                     (eww-end-of-field))))
 554         (when (string-match " +\\'" value)
 555           (setq value (substring value 0 (match-beginning 0))))
 556         (plist-put form :value value)
 557         (when (equal type "password")
 558           ;; Display passwords as asterisks.
 559           (let ((start (eww-beginning-of-field)))
 560             (put-text-property start (+ start (length value))
 561                                'display (make-string (length value) ?*))))))))
 562
 563 (defun eww-tag-textarea (cont)
 564   (let ((start (point))
 565         (value (or (cdr (assq :value cont)) ""))
 566         (lines (string-to-number
 567                 (or (cdr (assq :rows cont))
 568                     "10")))
 569         (width (string-to-number
 570                 (or (cdr (assq :cols cont))
 571                     "10")))
 572         end)
 573     (shr-ensure-newline)
 574     (insert value)
 575     (shr-ensure-newline)
 576     (when (< (count-lines start (point)) lines)
 577       (dotimes (i (- lines (count-lines start (point))))
 578         (insert "\n")))
 579     (setq end (point-marker))
 580     (goto-char start)
 581     (while (< (point) end)
 582       (end-of-line)
 583       (let ((pad (- width (- (point) (line-beginning-position)))))
 584         (when (> pad 0)
 585           (insert (make-string pad ? ))))
 586       (add-face-text-property (line-beginning-position)
 587                               (point) 'eww-form-text)
 588       (put-text-property (line-beginning-position) (point)
 589                          'local-map eww-textarea-map)
 590       (forward-line 1))
 591     (put-text-property start (point) 'eww-form
 592                        (list :eww-form eww-form
 593                              :value value
 594                              :type "textarea"
 595                              :name (cdr (assq :name cont))))))
 596
 597 (defun eww-tag-input (cont)
 598   (let ((type (downcase (or (cdr (assq :type cont))
 599                              "text")))
 600         (start (point)))
 601     (cond
 602      ((or (equal type "checkbox")
 603           (equal type "radio"))
 604       (eww-form-checkbox cont))
 605      ((equal type "submit")
 606       (eww-form-submit cont))
 607      ((equal type "hidden")
 608       (let ((form eww-form)
 609             (name (cdr (assq :name cont))))
 610         ;; Don't add <input type=hidden> elements repeatedly.
 611         (while (and form
 612                     (or (not (consp (car form)))
 613                         (not (eq (caar form) 'hidden))
 614                         (not (equal (plist-get (cdr (car form)) :name)
 615                                     name))))
 616           (setq form (cdr form)))
 617         (unless form
 618           (nconc eww-form (list
 619                            (list 'hidden
 620                                  :name name
 621                                  :value (cdr (assq :value cont))))))))
 622      (t
 623       (eww-form-text cont)))
 624     (unless (= start (point))
 625       (put-text-property start (1+ start) 'help-echo "Input field"))))
 626
 627 (defun eww-tag-select (cont)
 628   (shr-ensure-paragraph)
 629   (let ((menu (list :name (cdr (assq :name cont))
 630                     :eww-form eww-form))
 631         (options nil)
 632         (start (point))
 633         (max 0))
 634     (dolist (elem cont)
 635       (when (eq (car elem) 'option)
 636         (when (cdr (assq :selected (cdr elem)))
 637           (nconc menu (list :value
 638                             (cdr (assq :value (cdr elem))))))
 639         (let ((display (or (cdr (assq 'text (cdr elem))) "")))
 640           (setq max (max max (length display)))
 641           (push (list 'item
 642                       :value (cdr (assq :value (cdr elem)))
 643                       :display display)
 644                 options))))
 645     (when options
 646       (setq options (nreverse options))
 647       ;; If we have no selected values, default to the first value.
 648       (unless (plist-get menu :value)
 649         (nconc menu (list :value (nth 2 (car options)))))
 650       (nconc menu options)
 651       (let ((selected (eww-select-display menu)))
 652         (insert selected
 653                 (make-string (- max (length selected)) ? )))
 654       (put-text-property start (point) 'eww-form menu)
 655       (add-face-text-property start (point) 'eww-form-select)
 656       (put-text-property start (point) 'keymap eww-select-map)
 657       (shr-ensure-paragraph))))
 658
 659 (defun eww-select-display (select)
 660   (let ((value (plist-get select :value))
 661         display)
 662     (dolist (elem select)
 663       (when (and (consp elem)
 664                  (eq (car elem) 'item)
 665                  (equal value (plist-get (cdr elem) :value)))
 666         (setq display (plist-get (cdr elem) :display))))
 667     display))
 668
 669 (defun eww-change-select ()
 670   "Change the value of the select drop-down menu under point."
 671   (interactive)
 672   (let* ((input (get-text-property (point) 'eww-form))
 673          (properties (text-properties-at (point)))
 674          (completion-ignore-case t)
 675          (options
 676           (delq nil
 677                 (mapcar (lambda (elem)
 678                           (and (consp elem)
 679                                (eq (car elem) 'item)
 680                                (cons (plist-get (cdr elem) :display)
 681                                      (plist-get (cdr elem) :value))))
 682                         input)))
 683          (display
 684           (completing-read "Change value: " options nil 'require-match))
 685          (inhibit-read-only t))
 686     (plist-put input :value (cdr (assoc-string display options t)))
 687     (goto-char
 688      (eww-update-field display))))
 689
 690 (defun eww-update-field (string)
 691   (let ((properties (text-properties-at (point)))
 692         (start (eww-beginning-of-field))
 693         (end (1+ (eww-end-of-field))))
 694     (delete-region start end)
 695     (insert string
 696             (make-string (- (- end start) (length string)) ? ))
 697     (set-text-properties start end properties)
 698     start))
 699
 700 (defun eww-toggle-checkbox ()
 701   "Toggle the value of the checkbox under point."
 702   (interactive)
 703   (let* ((input (get-text-property (point) 'eww-form))
 704          (type (plist-get input :type)))
 705     (if (equal type "checkbox")
 706         (goto-char
 707          (1+
 708           (if (plist-get input :checked)
 709               (progn
 710                 (plist-put input :checked nil)
 711                 (eww-update-field "[ ]"))
 712             (plist-put input :checked t)
 713             (eww-update-field "[X]"))))
 714       ;; Radio button.  Switch all other buttons off.
 715       (let ((name (plist-get input :name)))
 716         (save-excursion
 717           (dolist (elem (eww-inputs (plist-get input :eww-form)))
 718             (when (equal (plist-get (cdr elem) :name) name)
 719               (goto-char (car elem))
 720               (if (not (eq (cdr elem) input))
 721                   (progn
 722                     (plist-put input :checked nil)
 723                     (eww-update-field "[ ]"))
 724                 (plist-put input :checked t)
 725                 (eww-update-field "[X]")))))
 726         (forward-char 1)))))
 727
 728 (defun eww-inputs (form)
 729   (let ((start (point-min))
 730         (inputs nil))
 731     (while (and start
 732                 (< start (point-max)))
 733       (when (or (get-text-property start 'eww-form)
 734                 (setq start (next-single-property-change start 'eww-form)))
 735         (when (eq (plist-get (get-text-property start 'eww-form) :eww-form)
 736                   form)
 737           (push (cons start (get-text-property start 'eww-form))
 738                 inputs))
 739         (setq start (next-single-property-change start 'eww-form))))
 740     (nreverse inputs)))
 741
 742 (defun eww-input-value (input)
 743   (let ((type (plist-get input :type))
 744         (value (plist-get input :value)))
 745     (cond
 746      ((equal type "textarea")
 747       (with-temp-buffer
 748         (insert value)
 749         (goto-char (point-min))
 750         (while (re-search-forward "^ +\n\\| +$" nil t)
 751           (replace-match "" t t))
 752         (buffer-string)))
 753      (t
 754       (if (string-match " +\\'" value)
 755           (substring value 0 (match-beginning 0))
 756         value)))))
 757
 758 (defun eww-submit ()
 759   "Submit the current form."
 760   (interactive)
 761   (let* ((this-input (get-text-property (point) 'eww-form))
 762          (form (plist-get this-input :eww-form))
 763          values next-submit)
 764     (dolist (elem (sort (eww-inputs form)
 765                          (lambda (o1 o2)
 766                            (< (car o1) (car o2)))))
 767       (let* ((input (cdr elem))
 768              (input-start (car elem))
 769              (name (plist-get input :name)))
 770         (when name
 771           (cond
 772            ((member (plist-get input :type) '("checkbox" "radio"))
 773             (when (plist-get input :checked)
 774               (push (cons name (plist-get input :value))
 775                     values)))
 776            ((equal (plist-get input :type) "submit")
 777             ;; We want the values from buttons if we hit a button if
 778             ;; we hit enter on it, or if it's the first button after
 779             ;; the field we did hit return on.
 780             (when (or (eq input this-input)
 781                       (and (not (eq input this-input))
 782                            (null next-submit)
 783                            (> input-start (point))))
 784               (setq next-submit t)
 785               (push (cons name (plist-get input :value))
 786                     values)))
 787            (t
 788             (push (cons name (eww-input-value input))
 789                   values))))))
 790     (dolist (elem form)
 791       (when (and (consp elem)
 792                  (eq (car elem) 'hidden))
 793         (push (cons (plist-get (cdr elem) :name)
 794                     (plist-get (cdr elem) :value))
 795               values)))
 796     (if (and (stringp (cdr (assq :method form)))
 797              (equal (downcase (cdr (assq :method form))) "post"))
 798         (let ((url-request-method "POST")
 799               (url-request-extra-headers
 800                '(("Content-Type" . "application/x-www-form-urlencoded")))
 801               (url-request-data (mm-url-encode-www-form-urlencoded values)))
 802           (eww-browse-url (shr-expand-url (cdr (assq :action form))
 803                                           eww-current-url)))
 804       (eww-browse-url
 805        (concat
 806         (if (cdr (assq :action form))
 807             (shr-expand-url (cdr (assq :action form))
 808                             eww-current-url)
 809           eww-current-url)
 810         "?"
 811         (mm-url-encode-www-form-urlencoded values))))))
 812
 813 (provide 'eww)
 814
 815 ;;; eww.el ends here