201 lines
7.5 KiB
EmacsLisp
201 lines
7.5 KiB
EmacsLisp
;;; metamail.el --- Metamail interface for GNU Emacs -*- lexical-binding: t; -*-
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;; Copyright (C) 1993, 1996, 2001-2024 Free Software Foundation, Inc.
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;; Author: Masanobu UMEDA <umerin@mse.kyutech.ac.jp>
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;; Keywords: mail, news, mime, multimedia
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;; Obsolete-since: 28.1
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Note: Metamail does not have all the options which are compatible with
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;; the environment variables. For that reason, metamail.el has to
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;; hack the environment variables. In addition, there is no way to
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;; display all header fields without extra informative body messages
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;; which are suppressed by the "-q" option.
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;; The idea of using metamail to process MIME messages is from
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;; gnus-mime.el by Spike <Spike@world.std.com>.
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;;; Code:
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(defvar rmail-current-message)
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(defvar rmail-message-vector)
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(defgroup metamail nil
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"Metamail interface for Emacs."
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:group 'mail
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:group 'processes)
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(defcustom metamail-program-name "metamail"
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"Metamail program name."
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:type 'string)
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(defcustom metamail-mailer-name "emacs"
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"Mailer name set to MM_MAILER environment variable."
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:type 'string)
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(defvar metamail-environment '("KEYHEADS=*" "MM_QUIET=1")
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"Environment variables passed to `metamail'.
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It must be a list of strings that have the format ENVVARNAME=VALUE.
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It is not expected to be altered globally by `set' or `setq'.
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Instead, change its value temporary using `let' or `let*' form.")
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(defcustom metamail-switches '("-x" "-d" "-z")
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"Switches for `metamail' program.
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`-z' is required to remove zap file.
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It is not expected to be altered globally by `set' or `setq'.
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Instead, change its value temporary using `let' or `let*' form.
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`-m MAILER' argument is automatically generated from the
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`metamail-mailer-name' variable."
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:type '(repeat (string :tag "Switch")))
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;;;###autoload
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(defun metamail-interpret-header ()
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"Interpret a header part of a MIME message in current buffer.
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Its body part is not interpreted at all."
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(interactive)
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(save-excursion
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(let* ((buffer-read-only nil)
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(metamail-switches ;Inhibit processing an empty body.
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(append metamail-switches '("-c" "text/plain" "-E" "7bit")))
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(end (progn
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(goto-char (point-min))
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(search-forward "\n\n" nil 'move)
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;; An extra newline is inserted by metamail if there
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;; is no body part. So, insert a dummy body by
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;; itself.
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(insert "\n")
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(point))))
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(metamail-region (point-min) end nil nil 'nodisplay)
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;; Remove an extra newline inserted by myself.
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(goto-char (point-min))
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(if (search-forward "\n\n\n" nil t)
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(delete-char -1))
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)))
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;;;###autoload
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(defun metamail-interpret-body (&optional viewmode nodisplay)
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"Interpret a body part of a MIME message in current buffer.
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Optional argument VIEWMODE specifies the value of the
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EMACS_VIEW_MODE environment variable (defaulted to 1).
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Optional argument NODISPLAY non-nil means buffer is not
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redisplayed as output is inserted.
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Its header part is not interpreted at all."
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(interactive "p")
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(save-excursion
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(let ((contype nil)
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(encoding nil)
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(end (progn
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(goto-char (point-min))
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(search-forward "\n\n" nil t)
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(point))))
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;; Find Content-Type and Content-Transfer-Encoding from the header.
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(save-restriction
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(narrow-to-region (point-min) end)
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(setq contype
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(or (mail-fetch-field "Content-Type") "text/plain"))
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(setq encoding
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(or (mail-fetch-field "Content-Transfer-Encoding") "7bit")))
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;; Interpret the body part only.
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(let ((metamail-switches ;Process body part only.
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(append metamail-switches
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(list "-b" "-c" contype "-E" encoding))))
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(metamail-region end (point-max) viewmode nil nodisplay))
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;; This mode specific hack is no longer appropriate in mbox Rmail.
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;; Pre-mbox, we have just modified the actual folder, so we
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;; update the message-vector with the new end position of the
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;; current message. In mbox Rmail, all we have done is modify a
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;; display copy of the message. Note also that point-max is a
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;; marker in the wrong buffer: the message-vector contains
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;; markers in rmail-view-buffer (which is not in rmail-mode).
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;; So this hack actually breaks the message-vector.
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;; If you're calling this on the actual rmail-view-buffer (or a
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;; non-swapped rmail-buffer), you would still need this hack.
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;; But you're not going to do that.
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;;; (cond ((eq major-mode 'rmail-mode)
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;;; ;; Adjust the marker of this message if in Rmail mode buffer.
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;;; (set-marker (aref rmail-message-vector (1+ rmail-current-message))
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;;; (point-max))))
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)))
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;;;###autoload
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(defun metamail-buffer (&optional viewmode buffer nodisplay)
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"Process current buffer through `metamail'.
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Optional argument VIEWMODE specifies the value of the
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EMACS_VIEW_MODE environment variable (defaulted to 1).
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Optional argument BUFFER specifies a buffer to be filled (nil
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means current).
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Optional argument NODISPLAY non-nil means buffer is not
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redisplayed as output is inserted."
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(interactive "p")
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(metamail-region (point-min) (point-max) viewmode buffer nodisplay))
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;;;###autoload
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(defun metamail-region (beg end &optional viewmode buffer nodisplay)
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"Process current region through `metamail'.
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Optional argument VIEWMODE specifies the value of the
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EMACS_VIEW_MODE environment variable (defaulted to 1).
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Optional argument BUFFER specifies a buffer to be filled (nil
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means current).
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Optional argument NODISPLAY non-nil means buffer is not
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redisplayed as output is inserted."
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(interactive "r\np")
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(let ((curbuf (current-buffer))
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(buffer-read-only nil)
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(metafile (make-temp-file "metamail"))
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(option-environment
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(list (format "EMACS_VIEW_MODE=%d"
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(if (numberp viewmode) viewmode 1)))))
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(save-excursion
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;; Gee! Metamail does not output to stdout if input comes from
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;; stdin.
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(let ((selective-display nil)) ;Disable ^M to nl translation.
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(write-region beg end metafile nil 'nomessage))
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(if buffer
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(set-buffer buffer))
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(setq buffer-read-only nil)
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;; Clear destination buffer.
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(if (eq curbuf (current-buffer))
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(delete-region beg end)
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(delete-region (point-min) (point-max)))
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;; We have to pass the environment variable KEYHEADS to display
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;; all header fields. Metamail should have an optional argument
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;; to pass such information directly.
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(let ((process-environment
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(append process-environment
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metamail-environment option-environment))
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(coding-system-for-read 'undecided))
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(apply (function call-process)
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metamail-program-name
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nil
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t ;Output to current buffer
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(not nodisplay) ;Force redisplay
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(append metamail-switches
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(list "-m" (or metamail-mailer-name "emacs"))
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(list metafile))))
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;; `metamail' may not delete the temporary file!
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(condition-case nil
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(delete-file metafile)
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(error nil))
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)))
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(provide 'metamail)
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;;; metamail.el ends here
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