From 5b1102fd23525dc6536548693e7e348ce32b8d86 Mon Sep 17 00:00:00 2001
From: keiichi <keiichi>
Date: Thu, 23 Dec 1999 10:21:38 +0000
Subject: [PATCH] Rename from `mailcap.el'.

---
 lisp/mm-mailcap.el |  894 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 894 insertions(+)
 create mode 100644 lisp/mm-mailcap.el

diff --git a/lisp/mm-mailcap.el b/lisp/mm-mailcap.el
new file mode 100644
index 0000000..278b50e
--- /dev/null
+++ b/lisp/mm-mailcap.el
@@ -0,0 +1,894 @@
+;;; mm-mailcap.el --- Functions for displaying MIME parts
+;; Copyright (C) 1998,99 Free Software Foundation, Inc.
+
+;; Author: William M. Perry <wmperry@aventail.com>
+;;	Lars Magne Ingebrigtsen <larsi@gnus.org>
+;; Keywords: news, mail
+
+;; 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 2, 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+(eval-and-compile
+  (require 'cl))
+(require 'mail-parse)
+
+(defvar mm-mailcap-parse-args-syntax-table
+  (let ((table (copy-syntax-table emacs-lisp-mode-syntax-table)))
+    (modify-syntax-entry ?' "\"" table)
+    (modify-syntax-entry ?` "\"" table)
+    (modify-syntax-entry ?{ "(" table)
+    (modify-syntax-entry ?} ")" table)
+    table)
+  "A syntax table for parsing sgml attributes.")
+
+(defvar mm-mailcap-mime-data
+  '(("application"
+     ("x-x509-ca-cert"
+      (viewer . ssl-view-site-cert)
+      (test . (fboundp 'ssl-view-site-cert))
+      (type . "application/x-x509-ca-cert"))
+     ("x-x509-user-cert"
+      (viewer . ssl-view-user-cert)
+      (test . (fboundp 'ssl-view-user-cert))
+      (type . "application/x-x509-user-cert"))
+     ("octet-stream"
+      (viewer . mm-mailcap-save-binary-file)
+      (non-viewer . t)
+      (type ."application/octet-stream"))
+     ("dvi"
+      (viewer . "open %s")
+      (type   . "application/dvi")
+      (test   . (eq (mm-device-type) 'ns)))
+     ("dvi"
+      (viewer . "xdvi %s")
+      (test   . (eq (mm-device-type) 'x))
+      ("needsx11")
+      (type   . "application/dvi"))
+     ("dvi"
+      (viewer . "dvitty %s")
+      (test   . (not (getenv "DISPLAY")))
+      (type   . "application/dvi"))
+     ("emacs-lisp"
+      (viewer . mm-mailcap-maybe-eval)
+      (type   . "application/emacs-lisp"))
+     ("x-tar"
+      (viewer . mm-mailcap-save-binary-file)
+      (non-viewer . t)
+      (type   . "application/x-tar"))
+     ("x-latex"
+      (viewer . tex-mode)
+      (test   . (fboundp 'tex-mode))
+      (type   . "application/x-latex"))
+     ("x-tex"
+      (viewer . tex-mode)
+      (test   . (fboundp 'tex-mode))
+      (type   . "application/x-tex"))
+     ("latex"
+      (viewer . tex-mode)
+      (test   . (fboundp 'tex-mode))
+      (type   . "application/latex"))
+     ("tex"
+      (viewer . tex-mode)
+      (test   . (fboundp 'tex-mode))
+      (type   . "application/tex"))
+     ("texinfo"
+      (viewer . texinfo-mode)
+      (test   . (fboundp 'texinfo-mode))
+      (type   . "application/tex"))
+     ("zip"
+      (viewer . mm-mailcap-save-binary-file)
+      (non-viewer . t)
+      (type   . "application/zip")
+      ("copiousoutput"))
+     ("pdf"
+      (viewer . "acroread %s")
+      (type   . "application/pdf"))
+     ("postscript"
+      (viewer . "open %s")
+      (type   . "application/postscript")
+      (test   . (eq (mm-device-type) 'ns)))
+     ("postscript"
+      (viewer . "ghostview -dSAFER %s")
+      (type . "application/postscript")
+      (test   . (eq (mm-device-type) 'x))
+      ("needsx11"))
+     ("postscript"
+      (viewer . "ps2ascii %s")
+      (type . "application/postscript")
+      (test . (not (getenv "DISPLAY")))
+      ("copiousoutput")))
+    ("audio"
+     ("x-mpeg"
+      (viewer . "maplay %s")
+      (type   . "audio/x-mpeg"))
+     (".*"
+      (viewer . mm-mailcap-save-binary-file)
+      (non-viewer . t)
+      (test   . (or (featurep 'nas-sound)
+		      (featurep 'native-sound)))
+      (type   . "audio/*"))
+     (".*"
+      (viewer . "showaudio")
+      (type   . "audio/*")))
+    ("message"
+     ("rfc-*822"
+      (viewer . mm-view-message)
+      (test   . (and (featurep 'gnus)
+		     (gnus-alive-p)))
+      (type   . "message/rfc822"))
+     ("rfc-*822"
+      (viewer . vm-mode)
+      (test   . (fboundp 'vm-mode))
+      (type   . "message/rfc822"))
+     ("rfc-*822"
+      (viewer . w3-mode)
+      (test   . (fboundp 'w3-mode))
+      (type   . "message/rfc822"))
+     ("rfc-*822"
+      (viewer . view-mode)
+      (test   . (fboundp 'view-mode))
+      (type   . "message/rfc822"))
+     ("rfc-*822"
+      (viewer . fundamental-mode)
+      (type   . "message/rfc822")))
+    ("image"
+     ("x-xwd"
+      (viewer  . "xwud -in %s")
+      (type    . "image/x-xwd")
+      ("compose" . "xwd -frame > %s")
+      (test    . (eq (mm-device-type) 'x))
+      ("needsx11"))
+     ("x11-dump"
+      (viewer . "xwud -in %s")
+      (type . "image/x-xwd")
+      ("compose" . "xwd -frame > %s")
+      (test   . (eq (mm-device-type) 'x))
+      ("needsx11"))
+     ("windowdump"
+      (viewer . "xwud -in %s")
+      (type . "image/x-xwd")
+      ("compose" . "xwd -frame > %s")
+      (test   . (eq (mm-device-type) 'x))
+      ("needsx11"))
+     (".*"
+      (viewer . "aopen %s")
+      (type   . "image/*")
+      (test   . (eq (mm-device-type) 'ns)))
+     (".*"
+      (viewer . "display %s")
+      (type . "image/*")
+      (test   . (eq (mm-device-type) 'x))
+      ("needsx11"))
+     (".*"
+      (viewer . "ee %s")
+      (type . "image/*")
+      (test   . (eq (mm-device-type) 'x))
+      ("needsx11")))
+    ("text"
+     ("plain"
+      (viewer  . w3-mode)
+      (test    . (fboundp 'w3-mode))
+      (type    . "text/plain"))
+     ("plain"
+      (viewer  . view-mode)
+      (test    . (fboundp 'view-mode))
+      (type    . "text/plain"))
+     ("plain"
+      (viewer  . fundamental-mode)
+      (type    . "text/plain"))
+     ("enriched"
+      (viewer . enriched-decode-region)
+      (test   . (fboundp 'enriched-decode))
+      (type   . "text/enriched"))
+     ("html"
+      (viewer . mm-w3-prepare-buffer)
+      (test   . (fboundp 'w3-prepare-buffer))
+      (type   . "text/html")))
+    ("video"
+     ("mpeg"
+      (viewer . "mpeg_play %s")
+      (type   . "video/mpeg")
+      (test   . (eq (mm-device-type) 'x))
+      ("needsx11")))
+    ("x-world"
+     ("x-vrml"
+      (viewer  . "webspace -remote %s -URL %u")
+      (type    . "x-world/x-vrml")
+      ("description"
+       "VRML document")))
+    ("archive"
+     ("tar"
+      (viewer . tar-mode)
+      (type . "archive/tar")
+      (test . (fboundp 'tar-mode)))))
+     "The mailcap structure is an assoc list of assoc lists.
+1st assoc list is keyed on the major content-type
+2nd assoc list is keyed on the minor content-type (which can be a regexp)
+
+Which looks like:
+-----------------
+ ((\"application\"
+   (\"postscript\" . <info>))
+  (\"text\"
+   (\"plain\" . <info>)))
+
+Where <info> is another assoc list of the various information
+related to the mailcap RFC.  This is keyed on the lowercase
+attribute name (viewer, test, etc).  This looks like:
+ ((viewer . viewerinfo)
+  (test   . testinfo)
+  (xxxx   . \"string\"))
+
+Where viewerinfo specifies how the content-type is viewed.  Can be
+a string, in which case it is run through a shell, with
+appropriate parameters, or a symbol, in which case the symbol is
+funcall'd, with the buffer as an argument.
+
+testinfo is a list of strings, or nil.  If nil, it means the
+viewer specified is always valid.  If it is a list of strings,
+these are used to determine whether a viewer passes the 'test' or
+not.")
+
+(defvar mm-mailcap-download-directory nil
+  "*Where downloaded files should go by default.")
+
+(defvar mm-mailcap-temporary-directory
+  (cond ((fboundp 'temp-directory) (temp-directory))
+	((boundp 'temporary-file-directory) temporary-file-directory)
+	("/tmp/"))
+  "*Where temporary files go.")
+
+;;;
+;;; Utility functions
+;;;
+
+(defun mm-mailcap-generate-unique-filename (&optional fmt)
+  "Generate a unique filename in mm-mailcap-temporary-directory"
+  (if (not fmt)
+      (let ((base (format "mm-mailcap-tmp.%d" (user-real-uid)))
+	    (fname "")
+	    (x 0))
+	(setq fname (format "%s%d" base x))
+	(while (file-exists-p
+		(expand-file-name fname mm-mailcap-temporary-directory))
+	  (setq x (1+ x)
+		fname (concat base (int-to-string x))))
+	(expand-file-name fname mm-mailcap-temporary-directory))
+    (let ((base (concat "mm" (int-to-string (user-real-uid))))
+	  (fname "")
+	  (x 0))
+      (setq fname (format fmt (concat base (int-to-string x))))
+      (while (file-exists-p
+	      (expand-file-name fname mm-mailcap-temporary-directory))
+	(setq x (1+ x)
+	      fname (format fmt (concat base (int-to-string x)))))
+      (expand-file-name fname mm-mailcap-temporary-directory))))
+
+(defun mm-mailcap-save-binary-file ()
+  (goto-char (point-min))
+  (unwind-protect
+      (let ((file (read-file-name
+		   "Filename to save as: "
+		   (or mm-mailcap-download-directory "~/")))
+	    (require-final-newline nil))
+	(write-region (point-min) (point-max) file))
+    (kill-buffer (current-buffer))))
+
+(defun mm-mailcap-maybe-eval ()
+  "Maybe evaluate a buffer of emacs lisp code"
+  (if (yes-or-no-p "This is emacs-lisp code, evaluate it? ")
+      (eval-buffer (current-buffer))
+    (emacs-lisp-mode)))
+
+;;;
+;;; The mailcap parser
+;;;
+
+(defun mm-mailcap-replace-regexp (regexp to-string)
+  ;; Quiet replace-regexp.
+  (goto-char (point-min))
+  (while (re-search-forward regexp nil t)
+    (replace-match to-string t nil)))
+
+(defvar mm-mailcap-parsed-p nil)
+
+(defun mm-mailcap-parse-mailcaps (&optional path force)
+  "Parse out all the mailcaps specified in a unix-style path string PATH.
+If FORCE, re-parse even if already parsed."
+  (interactive (list nil t))
+  (when (or (not mm-mailcap-parsed-p)
+	    force)
+    (cond
+     (path nil)
+     ((getenv "MAILCAPS") (setq path (getenv "MAILCAPS")))
+     ((memq system-type '(ms-dos ms-windows windows-nt))
+      (setq path (mapconcat 'expand-file-name
+			    '("~/mail.cap" "~/etc/mail.cap" "~/.mailcap")
+			    ";")))
+     (t (setq path (mapconcat 'expand-file-name
+			      '("~/.mailcap"
+				"/etc/mailcap:/usr/etc/mailcap"
+				"/usr/local/etc/mailcap") ":"))))
+    (let ((fnames (reverse
+		   (split-string
+		    path (if (memq system-type
+				   '(ms-dos ms-windows windows-nt))
+			     ";"
+			   ":"))))
+	  fname)
+      (while fnames
+	(setq fname (car fnames))
+       (if (and (file-exists-p fname) (file-readable-p fname)
+                (file-regular-p fname))
+	    (mm-mailcap-parse-mailcap (car fnames)))
+	(setq fnames (cdr fnames))))
+    (setq mm-mailcap-parsed-p t)))
+
+(defun mm-mailcap-parse-mailcap (fname)
+  ;; Parse out the mailcap file specified by FNAME
+  (let (major				; The major mime type (image/audio/etc)
+	minor				; The minor mime type (gif, basic, etc)
+	save-pos			; Misc saved positions used in parsing
+	viewer				; How to view this mime type
+	info				; Misc info about this mime type
+	)
+    (with-temp-buffer
+      (insert-file-contents fname)
+      (set-syntax-table mm-mailcap-parse-args-syntax-table)
+      (mm-mailcap-replace-regexp "#.*" "")	; Remove all comments
+      (mm-mailcap-replace-regexp "\n+" "\n") ; And blank lines
+      (mm-mailcap-replace-regexp "\\\\[ \t\n]+" " ") ; And collapse spaces
+      (mm-mailcap-replace-regexp (concat (regexp-quote "\\") "[ \t]*\n") "")
+      (goto-char (point-max))
+      (skip-chars-backward " \t\n")
+      (delete-region (point) (point-max))
+      (goto-char (point-min))
+      (while (not (eobp))
+	(skip-chars-forward " \t\n")
+	(setq save-pos (point)
+	      info nil)
+	(skip-chars-forward "^/; \t\n")
+	(downcase-region save-pos (point))
+	(setq major (buffer-substring save-pos (point)))
+	(skip-chars-forward " \t\n")
+	(setq minor "")
+	(when (eq (char-after) ?/)
+	  (forward-char)
+	  (skip-chars-forward " \t\n")
+	  (setq save-pos (point))
+	  (skip-chars-forward "^; \t\n")
+	  (downcase-region save-pos (point))
+	  (setq minor
+		(cond
+		 ((eq ?* (or (char-after save-pos) 0)) ".*")
+		 ((= (point) save-pos) ".*")
+		 (t (regexp-quote (buffer-substring save-pos (point)))))))
+	(skip-chars-forward " \t\n")
+	;;; Got the major/minor chunks, now for the viewers/etc
+	;;; The first item _must_ be a viewer, according to the
+	;;; RFC for mailcap files (#1343)
+	(setq viewer "")
+	(when (eq (char-after) ?\;) 
+	  (forward-char)
+	  (skip-chars-forward " \t\n")
+	  (setq save-pos (point))
+	  (skip-chars-forward "^;\n")
+	  ;; skip \;
+	  (while (eq (char-before) ?\\)
+	    (backward-delete-char 1)
+	    (forward-char)
+	    (skip-chars-forward "^;\n"))
+	  (if (eq (or (char-after save-pos) 0) ?')
+	      (setq viewer (progn
+			     (narrow-to-region (1+ save-pos) (point))
+			     (goto-char (point-min))
+			     (prog1
+				 (read (current-buffer))
+			       (goto-char (point-max))
+			       (widen))))
+	    (setq viewer (buffer-substring save-pos (point)))))
+	(setq save-pos (point))
+	(end-of-line)
+	(unless (equal viewer "") 
+	  (setq info (nconc (list (cons 'viewer viewer)
+				  (cons 'type (concat major "/"
+						      (if (string= minor ".*")
+							  "*" minor))))
+			    (mm-mailcap-parse-mailcap-extras save-pos (point))))
+	  (mm-mailcap-mailcap-entry-passes-test info)
+	  (mm-mailcap-add-mailcap-entry major minor info))))))
+
+(defun mm-mailcap-parse-mailcap-extras (st nd)
+  ;; Grab all the extra stuff from a mailcap entry
+  (let (
+	name				; From name=
+	value				; its value
+	results				; Assoc list of results
+	name-pos			; Start of XXXX= position
+	val-pos				; Start of value position
+	done				; Found end of \'d ;s?
+	)
+    (save-restriction
+      (narrow-to-region st nd)
+      (goto-char (point-min))
+      (skip-chars-forward " \n\t;")
+      (while (not (eobp))
+	(setq done nil)
+	(setq name-pos (point))
+	(skip-chars-forward "^ \n\t=;")
+	(downcase-region name-pos (point))
+	(setq name (buffer-substring name-pos (point)))
+	(skip-chars-forward " \t\n")
+	(if (not (eq (char-after (point)) ?=)) ; There is no value
+	    (setq value t)
+	  (skip-chars-forward " \t\n=")
+	  (setq val-pos (point))
+	  (if (memq (char-after val-pos) '(?\" ?'))
+	      (progn
+		(setq val-pos (1+ val-pos))
+		(condition-case nil
+		    (progn
+		      (forward-sexp 1)
+		      (backward-char 1))
+		  (error (goto-char (point-max)))))
+	    (while (not done)
+	      (skip-chars-forward "^;")
+	      (if (eq (char-after (1- (point))) ?\\ )
+		  (progn
+		    (subst-char-in-region (1- (point)) (point) ?\\ ? )
+		    (skip-chars-forward ";"))
+		(setq done t))))
+	  (setq	value (buffer-substring val-pos (point))))
+	(setq results (cons (cons name value) results))
+	(skip-chars-forward " \";\n\t"))
+      results)))
+
+(defun mm-mailcap-mailcap-entry-passes-test (info)
+  ;; Return t iff a mailcap entry passes its test clause or no test
+  ;; clause is present.
+  (let (status				; Call-process-regions return value
+	(test (assq 'test info))	; The test clause
+	)
+    (setq status (and test (split-string (cdr test) " ")))
+    (if (and (or (assoc "needsterm" info)
+		 (assoc "needsterminal" info)
+		 (assoc "needsx11" info))
+	     (not (getenv "DISPLAY")))
+	(setq status nil)
+      (cond
+       ((and (equal (nth 0 status) "test")
+	     (equal (nth 1 status) "-n")
+	     (or (equal (nth 2 status) "$DISPLAY")
+		 (equal (nth 2 status) "\"$DISPLAY\"")))
+	(setq status (if (getenv "DISPLAY") t nil)))
+       ((and (equal (nth 0 status) "test")
+	     (equal (nth 1 status) "-z")
+	     (or (equal (nth 2 status) "$DISPLAY")
+		 (equal (nth 2 status) "\"$DISPLAY\"")))
+	(setq status (if (getenv "DISPLAY") nil t)))
+       (test nil)
+       (t nil)))
+    (and test (listp test) (setcdr test status))))
+
+;;;
+;;; The action routines.
+;;;
+
+(defun mm-mailcap-possible-viewers (major minor)
+  ;; Return a list of possible viewers from MAJOR for minor type MINOR
+  (let ((exact '())
+	(wildcard '()))
+    (while major
+      (cond
+       ((equal (car (car major)) minor)
+	(setq exact (cons (cdr (car major)) exact)))
+       ((and minor (string-match (car (car major)) minor))
+	(setq wildcard (cons (cdr (car major)) wildcard))))
+      (setq major (cdr major)))
+    (nconc (nreverse exact) (nreverse wildcard))))
+
+(defun mm-mailcap-unescape-mime-test (test type-info)
+  (let (save-pos save-chr subst)
+    (cond
+     ((symbolp test) test)
+     ((and (listp test) (symbolp (car test))) test)
+     ((or (stringp test)
+	  (and (listp test) (stringp (car test))
+	       (setq test (mapconcat 'identity test " "))))
+      (with-temp-buffer
+	(insert test)
+	(goto-char (point-min))
+	(while (not (eobp))
+	  (skip-chars-forward "^%")
+	  (if (/= (- (point)
+		     (progn (skip-chars-backward "\\\\")
+			    (point)))
+		  0)			; It is an escaped %
+	      (progn
+		(delete-char 1)
+		(skip-chars-forward "%."))
+	    (setq save-pos (point))
+	    (skip-chars-forward "%")
+	    (setq save-chr (char-after (point)))
+	    (cond
+	     ((null save-chr) nil)
+	     ((= save-chr ?t)
+	      (delete-region save-pos (progn (forward-char 1) (point)))
+	      (insert (or (cdr (assq 'type type-info)) "\"\"")))
+	     ((= save-chr ?M)
+	      (delete-region save-pos (progn (forward-char 1) (point)))
+	      (insert "\"\""))
+	     ((= save-chr ?n)
+	      (delete-region save-pos (progn (forward-char 1) (point)))
+	      (insert "\"\""))
+	     ((= save-chr ?F)
+	      (delete-region save-pos (progn (forward-char 1) (point)))
+	      (insert "\"\""))
+	     ((= save-chr ?{)
+	      (forward-char 1)
+	      (skip-chars-forward "^}")
+	      (downcase-region (+ 2 save-pos) (point))
+	      (setq subst (buffer-substring (+ 2 save-pos) (point)))
+	      (delete-region save-pos (1+ (point)))
+	      (insert (or (cdr (assoc subst type-info)) "\"\"")))
+	     (t nil))))
+	(buffer-string)))
+     (t (error "Bad value to mm-mailcap-unescape-mime-test. %s" test)))))
+
+(defvar mm-mailcap-viewer-test-cache nil)
+
+(defun mm-mailcap-viewer-passes-test (viewer-info type-info)
+  ;; Return non-nil iff the viewer specified by VIEWER-INFO passes its
+  ;; test clause (if any).
+  (let* ((test-info (assq 'test viewer-info))
+	 (test (cdr test-info))
+	 (otest test)
+	 (viewer (cdr (assoc 'viewer viewer-info)))
+	 (default-directory (expand-file-name "~/"))
+	 status parsed-test cache result)
+    (if (setq cache (assoc test mm-mailcap-viewer-test-cache))
+	(cadr cache)
+      (setq
+       result
+       (cond
+	((not test-info) t)		; No test clause
+	((not test) nil)		; Already failed test
+	((eq test t) t)			; Already passed test
+	((and (symbolp test)		; Lisp function as test
+	      (fboundp test))
+	 (funcall test type-info))
+	((and (symbolp test)		; Lisp variable as test
+	      (boundp test))
+	 (symbol-value test))
+	((and (listp test)		; List to be eval'd
+	      (symbolp (car test)))
+	 (eval test))
+	(t
+	 (setq test (mm-mailcap-unescape-mime-test test type-info)
+	       test (list shell-file-name nil nil nil
+			  shell-command-switch test)
+	       status (apply 'call-process test))
+	 (= 0 status))))
+      (push (list otest result) mm-mailcap-viewer-test-cache)
+      result)))
+
+(defun mm-mailcap-add-mailcap-entry (major minor info)
+  (let ((old-major (assoc major mm-mailcap-mime-data)))
+    (if (null old-major)		; New major area
+	(setq mm-mailcap-mime-data
+	      (cons (cons major (list (cons minor info)))
+		    mm-mailcap-mime-data))
+      (let ((cur-minor (assoc minor old-major)))
+	(cond
+	 ((or (null cur-minor)		; New minor area, or
+	      (assq 'test info))	; Has a test, insert at beginning
+	  (setcdr old-major (cons (cons minor info) (cdr old-major))))
+	 ((and (not (assq 'test info)) ; No test info, replace completely
+	       (not (assq 'test cur-minor)))
+	  (setcdr cur-minor info))
+	 (t
+	  (setcdr old-major (cons (cons minor info) (cdr old-major)))))))))
+
+(defun mm-mailcap-add (type viewer &optional test)
+  "Add VIEWER as a handler for TYPE.
+If TEST is not given, it defaults to t."
+  (let ((tl (split-string type "/")))
+    (when (or (not (car tl))
+	      (not (cadr tl)))
+      (error "%s is not a valid MIME type" type))
+    (mm-mailcap-add-mailcap-entry
+     (car tl) (cadr tl)
+     `((viewer . ,viewer)
+       (test . ,(if test test t))
+       (type . ,type)))))
+
+;;;
+;;; The main whabbo
+;;;
+
+(defun mm-mailcap-viewer-lessp (x y)
+  ;; Return t iff viewer X is more desirable than viewer Y
+  (let ((x-wild (string-match "[*?]" (or (cdr-safe (assq 'type x)) "")))
+	(y-wild (string-match "[*?]" (or (cdr-safe (assq 'type y)) "")))
+	(x-lisp (not (stringp (or (cdr-safe (assq 'viewer x)) ""))))
+	(y-lisp (not (stringp (or (cdr-safe (assq 'viewer y)) "")))))
+    (cond
+     ((and x-wild (not y-wild))
+      nil)
+     ((and (not x-wild) y-wild)
+      t)
+     ((and (not y-lisp) x-lisp)
+      t)
+     (t nil))))
+
+(defun mm-mailcap-mime-info (string &optional request)
+  "Get the MIME viewer command for STRING, return nil if none found.
+Expects a complete content-type header line as its argument.
+
+Second argument REQUEST specifies what information to return.  If it is
+nil or the empty string, the viewer (second field of the mailcap
+entry) will be returned.  If it is a string, then the mailcap field
+corresponding to that string will be returned (print, description,
+whatever).  If a number, then all the information for this specific
+viewer is returned.  If `all', then all possible viewers for
+this type is returned."
+  (let (
+	major				; Major encoding (text, etc)
+	minor				; Minor encoding (html, etc)
+	info				; Other info
+	save-pos			; Misc. position during parse
+	major-info			; (assoc major mm-mailcap-mime-data)
+	minor-info			; (assoc minor major-info)
+	test				; current test proc.
+	viewers				; Possible viewers
+	passed				; Viewers that passed the test
+	viewer				; The one and only viewer
+	ctl)
+    (save-excursion
+      (setq ctl (mail-header-parse-content-type (or string "text/plain")))
+      (setq major (symbol-name (mime-content-type-primary-type ctl)))
+      (setq minor (symbol-name (mime-content-type-subtype ctl)))
+      (when (setq major-info (cdr (assoc major mm-mailcap-mime-data)))
+	(when (setq viewers (mm-mailcap-possible-viewers major-info minor))
+	  (setq info (mapcar (lambda (a) (cons (symbol-name (car a))
+					       (cdr a)))
+			     (cdr ctl)))
+	  (while viewers
+	    (if (mm-mailcap-viewer-passes-test (car viewers) info)
+		(setq passed (cons (car viewers) passed)))
+	    (setq viewers (cdr viewers)))
+	  (setq passed (sort (nreverse passed) 'mm-mailcap-viewer-lessp))
+	  (setq viewer (car passed))))
+      (when (and (stringp (cdr (assq 'viewer viewer)))
+		 passed)
+	(setq viewer (car passed)))
+      (cond
+       ((and (null viewer) (not (equal major "default")) request)
+	(mm-mailcap-mime-info "default" request))
+       ((or (null request) (equal request ""))
+	(mm-mailcap-unescape-mime-test (cdr (assq 'viewer viewer)) info))
+       ((stringp request)
+	(if (or (eq request 'test) (eq request 'viewer))
+	    (mm-mailcap-unescape-mime-test
+	     (cdr-safe (assoc request viewer)) info)))
+       ((eq request 'all)
+	passed)
+       (t
+	;; MUST make a copy *sigh*, else we modify mm-mailcap-mime-data
+	(setq viewer (copy-tree viewer))
+	(let ((view (assq 'viewer viewer))
+	      (test (assq 'test viewer)))
+	  (if view (setcdr view (mm-mailcap-unescape-mime-test (cdr view) info)))
+	  (if test (setcdr test (mm-mailcap-unescape-mime-test (cdr test) info))))
+	viewer)))))
+
+;;;
+;;; Experimental MIME-types parsing
+;;;
+
+(defvar mm-mailcap-mime-extensions
+  '((""          . "text/plain")
+    (".abs"      . "audio/x-mpeg")
+    (".aif"      . "audio/aiff")
+    (".aifc"     . "audio/aiff")
+    (".aiff"     . "audio/aiff")
+    (".ano"      . "application/x-annotator")
+    (".au"       . "audio/ulaw")
+    (".avi"      . "video/x-msvideo")
+    (".bcpio"    . "application/x-bcpio")
+    (".bin"      . "application/octet-stream")
+    (".cdf"      . "application/x-netcdr")
+    (".cpio"     . "application/x-cpio")
+    (".csh"      . "application/x-csh")
+    (".dvi"      . "application/x-dvi")
+    (".el"       . "application/emacs-lisp")
+    (".eps"      . "application/postscript")
+    (".etx"      . "text/x-setext")
+    (".exe"      . "application/octet-stream")
+    (".fax"      . "image/x-fax")
+    (".gif"      . "image/gif")
+    (".hdf"      . "application/x-hdf")
+    (".hqx"      . "application/mac-binhex40")
+    (".htm"      . "text/html")
+    (".html"     . "text/html")
+    (".icon"     . "image/x-icon")
+    (".ief"      . "image/ief")
+    (".jpg"      . "image/jpeg")
+    (".macp"     . "image/x-macpaint")
+    (".man"      . "application/x-troff-man")
+    (".me"       . "application/x-troff-me")
+    (".mif"      . "application/mif")
+    (".mov"      . "video/quicktime")
+    (".movie"    . "video/x-sgi-movie")
+    (".mp2"      . "audio/x-mpeg")
+    (".mp3"      . "audio/x-mpeg")
+    (".mp2a"     . "audio/x-mpeg2")
+    (".mpa"      . "audio/x-mpeg")
+    (".mpa2"     . "audio/x-mpeg2")
+    (".mpe"      . "video/mpeg")
+    (".mpeg"     . "video/mpeg")
+    (".mpega"    . "audio/x-mpeg")
+    (".mpegv"    . "video/mpeg")
+    (".mpg"      . "video/mpeg")
+    (".mpv"      . "video/mpeg")
+    (".ms"       . "application/x-troff-ms")
+    (".nc"       . "application/x-netcdf")
+    (".nc"       . "application/x-netcdf")
+    (".oda"      . "application/oda")
+    (".patch"    . "text/x-patch")
+    (".pbm"      . "image/x-portable-bitmap")
+    (".pdf"      . "application/pdf")
+    (".pgm"      . "image/portable-graymap")
+    (".pict"     . "image/pict")
+    (".png"      . "image/png")
+    (".pnm"      . "image/x-portable-anymap")
+    (".ppm"      . "image/portable-pixmap")
+    (".ps"       . "application/postscript")
+    (".qt"       . "video/quicktime")
+    (".ras"      . "image/x-raster")
+    (".rgb"      . "image/x-rgb")
+    (".rtf"      . "application/rtf")
+    (".rtx"      . "text/richtext")
+    (".sh"       . "application/x-sh")
+    (".sit"      . "application/x-stuffit")
+    (".snd"      . "audio/basic")
+    (".src"      . "application/x-wais-source")
+    (".tar"      . "archive/tar")
+    (".tcl"      . "application/x-tcl")
+    (".tcl"      . "application/x-tcl")
+    (".tex"      . "application/x-tex")
+    (".texi"     . "application/texinfo")
+    (".tga"      . "image/x-targa")
+    (".tif"      . "image/tiff")
+    (".tiff"     . "image/tiff")
+    (".tr"       . "application/x-troff")
+    (".troff"    . "application/x-troff")
+    (".tsv"      . "text/tab-separated-values")
+    (".txt"      . "text/plain")
+    (".vbs"      . "video/mpeg")
+    (".vox"      . "audio/basic")
+    (".vrml"     . "x-world/x-vrml")
+    (".wav"      . "audio/x-wav")
+    (".wrl"      . "x-world/x-vrml")
+    (".xbm"      . "image/xbm")
+    (".xpm"      . "image/xpm")
+    (".xwd"      . "image/windowdump")
+    (".zip"      . "application/zip")
+    (".ai"       . "application/postscript")
+    (".jpe"      . "image/jpeg")
+    (".jpeg"     . "image/jpeg"))
+  "An assoc list of file extensions and corresponding MIME content-types.")
+
+(defun mm-mailcap-parse-mimetypes (&optional path)
+  ;; Parse out all the mimetypes specified in a unix-style path string PATH
+  (cond
+   (path nil)
+   ((getenv "MIMETYPES") (setq path (getenv "MIMETYPES")))
+   ((memq system-type '(ms-dos ms-windows windows-nt))
+    (setq path (mapconcat 'expand-file-name
+			  '("~/mime.typ" "~/etc/mime.typ") ";")))
+   (t (setq path (mapconcat 'expand-file-name
+			    '("~/.mime-types"
+			      "/etc/mime-types:/usr/etc/mime-types"
+			      "/usr/local/etc/mime-types"
+			      "/usr/local/www/conf/mime-types") ":"))))
+  (let ((fnames (reverse
+		 (split-string path
+			       (if (memq system-type
+					 '(ms-dos ms-windows windows-nt))
+				   ";" ":"))))
+	fname)
+    (while fnames
+      (setq fname (car fnames))
+      (if (and (file-exists-p fname) (file-readable-p fname))
+	  (mm-mailcap-parse-mimetype-file (car fnames)))
+      (setq fnames (cdr fnames)))))
+
+(defun mm-mailcap-parse-mimetype-file (fname)
+  ;; Parse out a mime-types file
+  (let (type				; The MIME type for this line
+	extns				; The extensions for this line
+	save-pos			; Misc. saved buffer positions
+	)
+    (with-temp-buffer
+      (insert-file-contents fname)
+      (mm-mailcap-replace-regexp "#.*" "")
+      (mm-mailcap-replace-regexp "\n+" "\n")
+      (mm-mailcap-replace-regexp "[ \t]+$" "")
+      (goto-char (point-max))
+      (skip-chars-backward " \t\n")
+      (delete-region (point) (point-max))
+      (goto-char (point-min))
+      (while (not (eobp))
+	(skip-chars-forward " \t\n")
+	(setq save-pos (point))
+	(skip-chars-forward "^ \t")
+	(downcase-region save-pos (point))
+	(setq type (buffer-substring save-pos (point)))
+	(while (not (eolp))
+	  (skip-chars-forward " \t")
+	  (setq save-pos (point))
+	  (skip-chars-forward "^ \t\n")
+	  (setq extns (cons (buffer-substring save-pos (point)) extns)))
+	(while extns
+	  (setq mm-mailcap-mime-extensions
+		(cons
+		 (cons (if (= (string-to-char (car extns)) ?.)
+			   (car extns)
+			 (concat "." (car extns))) type)
+		 mm-mailcap-mime-extensions)
+		extns (cdr extns)))))))
+
+(defun mm-mailcap-extension-to-mime (extn)
+  "Return the MIME content type of the file extensions EXTN."
+  (if (and (stringp extn)
+	   (not (eq (string-to-char extn) ?.)))
+      (setq extn (concat "." extn)))
+  (cdr (assoc (downcase extn) mm-mailcap-mime-extensions)))
+
+(defvar mm-mailcap-binary-suffixes
+  (if (memq system-type '(ms-dos windows-nt))
+      '(".exe" ".com" ".bat" ".cmd" ".btm" "")
+    '("")))
+
+(defun mm-mailcap-command-p (command)
+  "Say whether COMMAND is in the exec path.
+The path of COMMAND will be returned iff COMMAND is a command."
+  (let ((path (if (file-name-absolute-p command) '(nil) exec-path))
+ 	file dir)
+    (catch 'found
+      (while (setq dir (pop path))
+	(let ((suffixes mm-mailcap-binary-suffixes))
+	  (while suffixes
+	    (when (and (file-executable-p
+			(setq file (expand-file-name
+				    (concat command (pop suffixes))
+				    dir)))
+		       (not (file-directory-p file)))
+	      (throw 'found file))))))))
+
+(defun mm-mailcap-mime-types ()
+  "Return a list of MIME media types."
+  (delete-duplicates (mapcar 'cdr mm-mailcap-mime-extensions)))
+
+(provide 'mm-mailcap)
+
+;;; mm-mailcap.el ends here
-- 
1.7.10.4