summaryrefslogtreecommitdiff
path: root/lisp/mh-e/mh-xface.el
blob: 52e453db531de95e9bebb30c7e0c1ee7b1d70078 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
;;; mh-xface.el --- MH-E X-Face and Face header field display

;; Copyright (C) 2002-2003, 2005-2018 Free Software Foundation, Inc.

;; Author: Bill Wohler <wohler@newt.com>
;; Maintainer: Bill Wohler <wohler@newt.com>
;; Keywords: mail
;; See: mh-e.el

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;;; Change Log:

;;; Code:

(require 'mh-e)
(mh-require-cl)

(autoload 'message-fetch-field "message")

(defvar mh-show-xface-function
  (cond ((and (featurep 'xemacs) (locate-library "x-face") (not (featurep 'xface)))
         (load "x-face" t t)
         #'mh-face-display-function)
        ((>= emacs-major-version 21)
         #'mh-face-display-function)
        (t #'ignore))
  "Determine at run time what function should be called to display X-Face.")

(defvar mh-uncompface-executable
  (and (fboundp 'executable-find) (executable-find "uncompface")))



;;; X-Face Display

;;;###mh-autoload
(defun mh-show-xface ()
  "Display X-Face."
  (when (and window-system mh-show-use-xface-flag
             (or mh-decode-mime-flag mh-mhl-format-file
                 mh-clean-message-header-flag))
    (funcall mh-show-xface-function)))

(defun mh-face-display-function ()
  "Display a Face, X-Face, or X-Image-URL header field.
If more than one of these are present, then the first one found
in this order is used."
  (save-restriction
    (goto-char (point-min))
    (re-search-forward "\n\n" (point-max) t)
    (narrow-to-region (point-min) (point))
    (let* ((case-fold-search t)
           (face (message-fetch-field "face" t))
           (x-face (message-fetch-field "x-face" t))
           (url (message-fetch-field "x-image-url" t))
           raw type)
      (cond (face (setq raw (mh-face-to-png face)
                        type 'png))
            (x-face (setq raw (mh-uncompface x-face)
                          type 'pbm))
            (url (setq type 'url))
            (t (multiple-value-setq (type raw)
                 (values-list (mh-picon-get-image)))))
      (when type
        (goto-char (point-min))
        (when (re-search-forward "^from:" (point-max) t)
          ;; GNU Emacs
          (mh-do-in-gnu-emacs
            (if (eq type 'url)
                (mh-x-image-url-display url)
              (mh-funcall-if-exists
               insert-image (create-image
                             raw type t
                             :foreground
                             (mh-face-foreground 'mh-show-xface nil t)
                             :background
                             (mh-face-background 'mh-show-xface nil t))
               " ")))
          ;; XEmacs
          (mh-do-in-xemacs
            (cond
             ((eq type 'url)
              (mh-x-image-url-display url))
             ((eq type 'png)
              (when (featurep 'png)
                (set-extent-begin-glyph
                 (make-extent (point) (point))
                 (make-glyph (vector 'png ':data (mh-face-to-png face))))))
             ;; Try internal xface support if available...
             ((and (eq type 'pbm) (featurep 'xface))
              (set-glyph-face
               (set-extent-begin-glyph
                (make-extent (point) (point))
                (make-glyph (vector 'xface ':data (concat "X-Face: " x-face))))
               'mh-show-xface))
             ;; Otherwise try external support with x-face...
             ((and (eq type 'pbm)
                   (fboundp 'x-face-xmas-wl-display-x-face)
                   (fboundp 'executable-find) (executable-find "uncompface"))
              (mh-funcall-if-exists x-face-xmas-wl-display-x-face))
             ;; Picon display
             ((and raw (member type '(xpm xbm gif)))
              (when (featurep type)
                (set-extent-begin-glyph
                 (make-extent (point) (point))
                 (make-glyph (vector type ':data raw))))))
            (when raw (insert " "))))))))

(defun mh-face-to-png (data)
  "Convert base64 encoded DATA to png image."
  (with-temp-buffer
    (if (fboundp 'set-buffer-multibyte)
        (set-buffer-multibyte nil))
    (insert data)
    (ignore-errors (base64-decode-region (point-min) (point-max)))
    (buffer-string)))

(defun mh-uncompface (data)
  "Run DATA through `uncompface' to generate bitmap."
  (with-temp-buffer
    (if (fboundp 'set-buffer-multibyte)
        (set-buffer-multibyte nil))
    (insert data)
    (when (and mh-uncompface-executable
               (equal (call-process-region (point-min) (point-max)
                                           mh-uncompface-executable t '(t nil))
                      0))
      (mh-icontopbm)
      (buffer-string))))

(defun mh-icontopbm ()
  "Elisp substitute for `icontopbm'."
  (goto-char (point-min))
  (let ((end (point-max)))
    (while (re-search-forward "0x\\(..\\)\\(..\\)," nil t)
      (save-excursion
        (goto-char (point-max))
        (insert (string-to-number (match-string 1) 16))
        (insert (string-to-number (match-string 2) 16))))
    (delete-region (point-min) end)
    (goto-char (point-min))
    (insert "P4\n48 48\n")))



;;; Picon Display

;; XXX: This should be customizable. As a side-effect of setting this
;;   variable, arrange to reset mh-picon-existing-directory-list to 'unset.
(defvar mh-picon-directory-list
  '("~/.picons" "~/.picons/users" "~/.picons/usenix" "~/.picons/news"
    "~/.picons/domains" "~/.picons/misc"
    "/usr/share/picons/" "/usr/share/picons/users" "/usr/share/picons/usenix"
    "/usr/share/picons/news" "/usr/share/picons/domains"
    "/usr/share/picons/misc")
  "List of directories where picons reside.
The directories are searched for in the order they appear in the list.")

(defvar mh-picon-existing-directory-list 'unset
  "List of directories to search in.")

(defvar mh-picon-cache (make-hash-table :test #'equal))

(defvar mh-picon-image-types
  (loop for type in '(xpm xbm gif)
        when (or (mh-do-in-gnu-emacs
                   (ignore-errors
                     (mh-funcall-if-exists image-type-available-p type)))
                 (mh-do-in-xemacs (featurep type)))
        collect type))

(autoload 'message-tokenize-header "sendmail")

(defun* mh-picon-get-image ()
  "Find the best possible match and return contents."
  (mh-picon-set-directory-list)
  (save-restriction
    (let* ((from-field (ignore-errors (car (message-tokenize-header
                                            (mh-get-header-field "from:")))))
           (from (car (ignore-errors
                        (mh-funcall-if-exists ietf-drums-parse-address
                                              from-field))))
           (host (and from
                      (string-match "\\([^+]*\\)\\(+.*\\)?@\\(.*\\)" from)
                      (downcase (match-string 3 from))))
           (user (and host (downcase (match-string 1 from))))
           (canonical-address (format "%s@%s" user host))
           (cached-value (gethash canonical-address mh-picon-cache))
           (host-list (and host (delete "" (split-string host "\\."))))
           (match nil))
      (cond (cached-value (return-from mh-picon-get-image cached-value))
            ((not host-list) (return-from mh-picon-get-image nil)))
      (setq match
            (block loop
              ;; u@h search
              (loop for dir in mh-picon-existing-directory-list
                    do (loop for type in mh-picon-image-types
                             ;; [path]user@host
                             for file1 = (format "%s/%s.%s"
                                                 dir canonical-address type)
                             when (file-exists-p file1)
                             do (return-from loop file1)
                             ;; [path]user
                             for file2 = (format "%s/%s.%s" dir user type)
                             when (file-exists-p file2)
                             do (return-from loop file2)
                             ;; [path]host
                             for file3 = (format "%s/%s.%s" dir host type)
                             when (file-exists-p file3)
                             do (return-from loop file3)))
              ;; facedb search
              ;; Search order for user@foo.net:
              ;;   [path]net/foo/user
              ;;   [path]net/foo/user/face
              ;;   [path]net/user
              ;;   [path]net/user/face
              ;;   [path]net/foo/unknown
              ;;   [path]net/foo/unknown/face
              ;;   [path]net/unknown
              ;;   [path]net/unknown/face
              (loop for u in (list user "unknown")
                    do (loop for dir in mh-picon-existing-directory-list
                             do (loop for x on host-list by #'cdr
                                      for y = (mh-picon-generate-path x u dir)
                                      do (loop for type in mh-picon-image-types
                                               for z1 = (format "%s.%s" y type)
                                               when (file-exists-p z1)
                                               do (return-from loop z1)
                                               for z2 = (format "%s/face.%s"
                                                                y type)
                                               when (file-exists-p z2)
                                               do (return-from loop z2)))))))
      (setf (gethash canonical-address mh-picon-cache)
            (mh-picon-file-contents match)))))

(defun mh-picon-set-directory-list ()
  "Update `mh-picon-existing-directory-list' if needed."
  (when (eq mh-picon-existing-directory-list 'unset)
    (setq mh-picon-existing-directory-list
          (loop for x in mh-picon-directory-list
                when (file-directory-p x) collect x))))

(defun mh-picon-generate-path (host-list user directory)
  "Generate the image file path.
HOST-LIST is the parsed host address of the email address, USER
the username and DIRECTORY is the directory relative to which the
path is generated."
  (loop with acc = ""
        for elem in host-list
        do (setq acc (format "%s/%s" elem acc))
        finally return (format "%s/%s%s" directory acc user)))

(defun mh-picon-file-contents (file)
  "Return details about FILE.
A list of consisting of a symbol for the type of the file and the
file contents as a string is returned. If FILE is nil, then both
elements of the list are nil."
  (if (stringp file)
      (with-temp-buffer
        (if (fboundp 'set-buffer-multibyte)
            (set-buffer-multibyte nil))
        (let ((type (and (string-match ".*\\.\\(...\\)$" file)
                         (intern (match-string 1 file)))))
          (insert-file-contents-literally file)
          (list type (buffer-string))))
    (list nil nil)))



;;; X-Image-URL Display

(defvar mh-x-image-scaling-function
  (cond ((executable-find "convert")
         'mh-x-image-scale-with-convert)
        ((and (executable-find "anytopnm") (executable-find "pnmscale")
              (executable-find "pnmtopng"))
         'mh-x-image-scale-with-pnm)
        (t 'ignore))
  "Function to use to scale image to proper size.")

(defun mh-x-image-scale-with-pnm (input output)
  "Scale image in INPUT file and write to OUTPUT file using pnm tools."
  (let ((res (shell-command-to-string
              (format "anytopnm < %s | pnmscale -xysize 96 48 | pnmtopng > %s"
                      input output))))
    (unless (equal res "")
      (delete-file output))))

(defun mh-x-image-scale-with-convert (input output)
  "Scale image in INPUT file and write to OUTPUT file using ImageMagick."
  (call-process "convert" nil nil nil "-geometry" "96x48" input output))

(defvar mh-wget-executable nil)
(defvar mh-wget-choice
  (or (and (setq mh-wget-executable (executable-find "wget")) 'wget)
      (and (setq mh-wget-executable (executable-find "fetch")) 'fetch)
      (and (setq mh-wget-executable (executable-find "curl")) 'curl)))
(defvar mh-wget-option
  (cdr (assoc mh-wget-choice '((curl . "-o") (fetch . "-o") (wget . "-O")))))
(defvar mh-x-image-temp-file nil)
(defvar mh-x-image-url nil)
(defvar mh-x-image-marker nil)
(defvar mh-x-image-url-cache-file nil)

(defun mh-x-image-url-display (url)
  "Display image from location URL.
If the URL isn't present in the cache then it is fetched with wget."
  (let* ((cache-filename (mh-x-image-url-cache-canonicalize url))
         (state (mh-x-image-get-download-state cache-filename))
         (marker (point-marker)))
    (set (make-local-variable 'mh-x-image-marker) marker)
    (cond ((not (mh-x-image-url-sane-p url)))
          ((eq state 'ok)
           (mh-x-image-display cache-filename marker))
          ((or (not mh-wget-executable)
               (eq mh-x-image-scaling-function 'ignore)))
          ((eq state 'never))
          ((not mh-fetch-x-image-url)
           (set-marker marker nil))
          ((eq state 'try-again)
           (mh-x-image-set-download-state cache-filename nil)
           (mh-x-image-url-fetch-image url cache-filename marker
                                       'mh-x-image-scale-and-display))
          ((and (eq mh-fetch-x-image-url 'ask)
                (not (y-or-n-p (format "Fetch %s? " url))))
           (mh-x-image-set-download-state cache-filename 'never))
          ((eq state nil)
           (mh-x-image-url-fetch-image url cache-filename marker
                                       'mh-x-image-scale-and-display)))))

(defvar mh-x-image-cache-directory nil
  "Directory where X-Image-URL images are cached.")

;;;###mh-autoload
(defun mh-set-x-image-cache-directory (directory)
  "Set the DIRECTORY where X-Image-URL images are cached.
This is only done if `mh-x-image-cache-directory' is nil."
  ;; XXX This is the code that used to be in find-user-path. Is there
  ;; a good reason why the variable is set conditionally? Do we expect
  ;; the user to have set this variable directly?
  (unless mh-x-image-cache-directory
    (setq mh-x-image-cache-directory directory)))

(defun mh-x-image-url-cache-canonicalize (url)
  "Canonicalize URL.
Replace the ?/ character with a ?! character and append .png.
Also replaces special characters with `mh-url-hexify-string'
since not all characters, such as :, are valid within Windows
filenames.  In addition, replaces * with %2a. See URL
`http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/shell/reference/ifaces/iitemnamelimits/GetValidCharacters.asp'."
  (format "%s/%s.png" mh-x-image-cache-directory
          (mh-replace-regexp-in-string
           "\\*" "%2a"
           (mh-url-hexify-string
            (with-temp-buffer
              (insert url)
              (mh-replace-string "/" "!")
              (buffer-string))))))

(defun mh-x-image-get-download-state (file)
  "Check the state of FILE by following any symbolic links."
  (unless (file-exists-p mh-x-image-cache-directory)
    (call-process "mkdir" nil nil nil mh-x-image-cache-directory))
  (cond ((file-symlink-p file)
         (intern (file-name-nondirectory (file-chase-links file))))
        ((not (file-exists-p file)) nil)
        (t 'ok)))

(defun mh-x-image-set-download-state (file data)
  "Setup a symbolic link from FILE to DATA."
  (if data
      (make-symbolic-link (symbol-name data) file t)
    (delete-file file)))

(defun mh-x-image-url-sane-p (url)
  "Check if URL is something sensible."
  (let ((len (length url)))
    (cond ((< len 5) nil)
          ((not (equal (substring url 0 5) "http:")) nil)
          ((> len 100) nil)
          (t t))))

(defun mh-x-image-display (image marker)
  "Display IMAGE at MARKER."
  (with-current-buffer (marker-buffer marker)
    (let ((inhibit-read-only t)
          (buffer-modified-flag (buffer-modified-p)))
      (unwind-protect
          (when (and (file-readable-p image) (not (file-symlink-p image))
                     (eq marker mh-x-image-marker))
            (goto-char marker)
            (mh-do-in-gnu-emacs
              (mh-funcall-if-exists insert-image (create-image image 'png)))
            (mh-do-in-xemacs
              (when (featurep 'png)
                (set-extent-begin-glyph
                 (make-extent (point) (point))
                 (make-glyph
                  (vector 'png ':data (with-temp-buffer
                                        (insert-file-contents-literally image)
                                        (buffer-string))))))))
        (set-buffer-modified-p buffer-modified-flag)))))

(defun mh-x-image-url-fetch-image (url cache-file marker sentinel)
  "Fetch and display the image specified by URL.
After the image is fetched, it is stored in CACHE-FILE. It will
be displayed in a buffer and position specified by MARKER. The
actual display is carried out by the SENTINEL function."
  (if mh-wget-executable
      (let ((buffer (get-buffer-create (generate-new-buffer-name
                                        mh-temp-fetch-buffer)))
            (filename (or (mh-funcall-if-exists make-temp-file "mhe-fetch")
                          (expand-file-name (make-temp-name "~/mhe-fetch")))))
        (with-current-buffer buffer
          (set (make-local-variable 'mh-x-image-url-cache-file) cache-file)
          (set (make-local-variable 'mh-x-image-marker) marker)
          (set (make-local-variable 'mh-x-image-temp-file) filename))
        (set-process-sentinel
         (start-process "*mh-x-image-url-fetch*" buffer
                        mh-wget-executable mh-wget-option filename url)
         sentinel))
    ;; Temporary failure
    (mh-x-image-set-download-state cache-file 'try-again)))

(defun mh-x-image-scale-and-display (process change)
  "When the wget PROCESS terminates scale and display image.
The argument CHANGE is ignored."
  (when (eq (process-status process) 'exit)
    (let (marker temp-file cache-filename wget-buffer)
      (with-current-buffer (setq wget-buffer (process-buffer process))
        (setq marker mh-x-image-marker
              cache-filename mh-x-image-url-cache-file
              temp-file mh-x-image-temp-file))
      (cond
       ;; Check if we have `convert'
       ((eq mh-x-image-scaling-function 'ignore)
        (message "The \"convert\" program is needed to display X-Image-URL")
        (mh-x-image-set-download-state cache-filename 'try-again))
       ;; Scale fetched image
       ((and (funcall mh-x-image-scaling-function temp-file cache-filename)
             nil))
       ;; Attempt to display image if we have it
       ((file-exists-p cache-filename)
        (mh-x-image-display cache-filename marker))
       ;; We didn't find the image. Should we try to display it the next time?
       (t (mh-x-image-set-download-state cache-filename 'try-again)))
      (ignore-errors
        (set-marker marker nil)
        (delete-process process)
        (kill-buffer wget-buffer)
        (delete-file temp-file)))))

(provide 'mh-xface)

;; Local Variables:
;; indent-tabs-mode: nil
;; sentence-end-double-space: nil
;; End:

;;; mh-xface.el ends here