Variable: mailcap-user-mime-data

mailcap-user-mime-data is a customizable variable defined in mailcap.el.gz.

Value

nil

Documentation

A list of viewers preferred for different MIME types.

The elements of the list are lists of the following structure

  (VIEWER MIME-TYPE TEST)

where VIEWER is either a Lisp command, e.g., a major mode, or a string containing a shell command for viewing files of the defined MIME-TYPE. In case of a shell command, %s will be replaced with the file.

MIME-TYPE is a regular expression being matched against the actual MIME type. It is implicitly surrounded with ^ and $.

TEST is a Lisp form which is evaluated in order to test if the entry should be chosen. The test entry is optional.

When selecting a viewer for a given MIME type, the first viewer in this list with a matching MIME-TYPE and successful TEST is selected. Only if none matches, the standard mailcap-mime-data is consulted.

This variable was added, or its default value changed, in Emacs 26.1.

Source Code

;; Defined in /usr/src/emacs/lisp/net/mailcap.el.gz
(defcustom mailcap-user-mime-data nil
  "A list of viewers preferred for different MIME types.
The elements of the list are lists of the following structure

  (VIEWER MIME-TYPE TEST)

where VIEWER is either a Lisp command, e.g., a major mode, or a
string containing a shell command for viewing files of the
defined MIME-TYPE.  In case of a shell command, %s will be
replaced with the file.

MIME-TYPE is a regular expression being matched against the
actual MIME type.  It is implicitly surrounded with ^ and $.

TEST is a Lisp form which is evaluated in order to test if the
entry should be chosen.  The `test' entry is optional.

When selecting a viewer for a given MIME type, the first viewer
in this list with a matching MIME-TYPE and successful TEST is
selected.  Only if none matches, the standard `mailcap-mime-data'
is consulted."
  :version "26.1"
  :type '(repeat
	  (list
	   (choice (function :tag "Function or mode")
		   (string :tag "Shell command"))
	   (regexp :tag "MIME Type")
	   (sexp :tag "Test (optional)")))
  :get #'mailcap--get-user-mime-data
  :set #'mailcap--set-user-mime-data)