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- ;;; metamail.el --- Metamail interface for GNU Emacs
-
- ;; Copyright (C) 1993, 1996 Masanobu UMEDA
-
- ;; Author: Masanobu UMEDA <umerin@mse.kyutech.ac.jp>
- ;; Version: $Header: /home/fsf/rms/e19/lisp/RCS/metamail.el,v 1.5 1996/04/19 18:05:38 rms Exp $
- ;; Keywords: mail, news, mime, multimedia
-
- ;; 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:
-
- ;; The latest version will be at:
- ;; ftp://ftp.kyutech.ac.jp/pub/MultiMedia/mime/emacs-mime-tools.shar
-
- ;; Note: Metamail does not have all options which is compatible with
- ;; the environment variables. For that reason, matamail.el have to
- ;; hack the environment variables. In addition, there is no way to
- ;; display all header fields without extra informative body messages
- ;; which are suppressed by "-q" option.
-
- ;; The following definition is what I'm using with GNUS 4:
- ;;(setq gnus-show-mime-method
- ;; (function
- ;; (lambda ()
- ;; (metamail-interpret-header)
- ;; (let ((metamail-switches ;Suppress header fields in a body.
- ;; (append metamail-switches '("-q"))))
- ;; (metamail-interpret-body)))))
-
- ;; The idea of using metamail to process MIME messages is from
- ;; gnus-mime.el by Spike <Spike@world.std.com>.
-
- ;;; Code:
-
- (defvar metamail-program-name "metamail"
- "*Metamail program name.")
-
- (defvar metamail-mailer-name "emacs"
- "*Mailer name set to MM_MAILER environment variable.")
-
- (defvar metamail-environment '("KEYHEADS=*" "MM_QUIET=1")
- "*Environment variables passed to `metamail'.
- It must be a list of strings that have the format ENVVARNAME=VALUE.
- It is not expected to be altered globally by `set' or `setq'.
- Instead, change its value temporary using `let' or `let*' form.")
-
- (defvar metamail-switches '("-x" "-d" "-z")
- "*Switches for `metamail' program.
- `-z' is required to remove zap file.
- It is not expected to be altered globally by `set' or `setq'.
- Instead, change its value temporary using `let' or `let*' form.
- `-m MAILER' argument is automatically generated from the
- `metamail-mailer-name' variable.")
-
- ;;;###autoload
- (defun metamail-interpret-header ()
- "Interpret a header part of a MIME message in current buffer.
- Its body part is not interpreted at all."
- (interactive)
- (save-excursion
- (let* ((buffer-read-only nil)
- (metamail-switches ;Inhibit processing an empty body.
- (append metamail-switches '("-c" "text/plain" "-E" "7bit")))
- (end (progn
- (goto-char (point-min))
- (search-forward "\n\n" nil 'move)
- ;; An extra newline is inserted by metamail if there
- ;; is no body part. So, insert a dummy body by
- ;; itself.
- (insert "\n")
- (point))))
- (metamail-region (point-min) end nil nil 'nodisplay)
- ;; Remove an extra newline inserted by myself.
- (goto-char (point-min))
- (if (search-forward "\n\n\n" nil t)
- (delete-char -1))
- )))
-
- ;;;###autoload
- (defun metamail-interpret-body (&optional viewmode nodisplay)
- "Interpret a body part of a MIME message in current buffer.
- Optional argument VIEWMODE specifies the value of the
- EMACS_VIEW_MODE environment variable (defaulted to 1).
- Optional argument NODISPLAY non-nil means buffer is not
- redisplayed as output is inserted.
- Its header part is not interpreted at all."
- (interactive "p")
- (save-excursion
- (let ((contype nil)
- (encoding nil)
- (end (progn
- (goto-char (point-min))
- (search-forward "\n\n" nil t)
- (point))))
- ;; Find Content-Type and Content-Transfer-Encoding from the header.
- (save-restriction
- (narrow-to-region (point-min) end)
- (setq contype
- (or (mail-fetch-field "Content-Type") "text/plain"))
- (setq encoding
- (or (mail-fetch-field "Content-Transfer-Encoding") "7bit")))
- ;; Interpret the body part only.
- (let ((metamail-switches ;Process body part only.
- (append metamail-switches
- (list "-b" "-c" contype "-E" encoding))))
- (metamail-region end (point-max) viewmode nil nodisplay))
- ;; Mode specific hack.
- (cond ((eq major-mode 'rmail-mode)
- ;; Adjust the marker of this message if in Rmail mode buffer.
- (set-marker (aref rmail-message-vector (1+ rmail-current-message))
- (point-max))))
- )))
-
- ;;;###autoload
- (defun metamail-buffer (&optional viewmode buffer nodisplay)
- "Process current buffer through `metamail'.
- Optional argument VIEWMODE specifies the value of the
- EMACS_VIEW_MODE environment variable (defaulted to 1).
- Optional argument BUFFER specifies a buffer to be filled (nil
- means current).
- Optional argument NODISPLAY non-nil means buffer is not
- redisplayed as output is inserted."
- (interactive "p")
- (metamail-region (point-min) (point-max) viewmode buffer nodisplay))
-
- ;;;###autoload
- (defun metamail-region (beg end &optional viewmode buffer nodisplay)
- "Process current region through 'metamail'.
- Optional argument VIEWMODE specifies the value of the
- EMACS_VIEW_MODE environment variable (defaulted to 1).
- Optional argument BUFFER specifies a buffer to be filled (nil
- means current).
- Optional argument NODISPLAY non-nil means buffer is not
- redisplayed as output is inserted."
- (interactive "r\np")
- (let ((curbuf (current-buffer))
- (buffer-read-only nil)
- (metafile (make-temp-name "/tmp/metamail"))
- (option-environment
- (list (concat "EMACS_VIEW_MODE="
- (if (numberp viewmode) viewmode 1)))))
- (save-excursion
- ;; Gee! Metamail does not ouput to stdout if input comes from
- ;; stdin.
- (let ((selective-display nil) ;Disable ^M to nl translation.
- (kanji-fileio-code 2) ;Write in JIS code when nemacs.
- (file-coding-system ;Write in JUNET style when mule.
- (if (featurep 'mule) *junet*)))
- (write-region beg end metafile nil 'nomessage))
- (if buffer
- (set-buffer buffer))
- (setq buffer-read-only nil)
- ;; Clear destination buffer.
- (if (eq curbuf (current-buffer))
- (delete-region beg end)
- (delete-region (point-min) (point-max)))
- ;; We have to pass the environment variable KEYHEADS to display
- ;; all header fields. Metamail should have an optional argument
- ;; to pass such information directly.
- (let ((process-environment
- (append process-environment
- metamail-environment option-environment)))
- ;; Specify character coding system.
- (if (boundp 'NEMACS)
- (define-program-kanji-code nil metamail-program-name 2)) ;JIS
- (if (featurep 'mule)
- (define-program-coding-system nil metamail-program-name *junet*))
- (apply (function call-process)
- metamail-program-name
- nil
- t ;Output to current buffer
- (not nodisplay) ;Force redisplay
- (append metamail-switches
- (list "-m" (or metamail-mailer-name "emacs"))
- (list metafile))))
- ;; `metamail' may not delete the temporary file!
- (condition-case error
- (delete-file metafile)
- (error nil))
- )))
-
- (provide 'metamail)
-
- ;;; metamail.el ends here
-