xdg-open vs run-mailcap, или как вернуться к истокам

       default
           Ask the desktop environment to make application the default
           application for opening files of type mimetype. An application can
           be made the default for several file types by specifying multiple
           mimetypes.

           application is the desktop file id of the application and has the
           form vendor-name.desktop application must already be installed in
           the desktop menu before it can be made the default handler. The
           application's desktop file must list support for all the MIME types
           that it wishes to be the default handler for.

           Requests to make an application a default handler may be subject to
           system policy or approval by the end-user. xdg-mime query can be
           used to verify whether an application is the actual default handler
           for a specific file type.

           The default option is for use inside a desktop session only. It is
           not recommended to use xdg-mime default as root.

$ xdg-mime default run-mailcap.desktop '*/*'
$ xdg-mime query default '*/*'
run-mailcap.desktop

$ xdg-mime query default 'application/octet-stream'

The "type" field (text/plain, in the above example) is simply any legal
       content  type name, as defined by informational RFC 1524.  In practice,
       this is almost any string.  It is  the  string  that  will  be  matched
       against  the  "Content-type" header (or the value passed in with -c) to
       decide if this is the mailcap entry that matches the  current  message.
       Additionally,   the   type   field   may   specify   a   subtype  (e.g.
       "text/ISO-8859-1")  or  a  wildcard  to  match   all   subtypes   (e.g.
       "image/*").

#!/bin/bash

# Script makes all mailcap-known mime types
# open with run-mailcap instead of xdg-open
#
# Reason: xdg-open have bad application
# associations, run-mailcap works better

MAILCAP_TYPES="/etc/mailcap"
MIMEAPPS_LIST="${HOME}/.config/mimeapps.list"

MAILCAP_DESKTOP="run-mailcap.desktop"
MAILCAP_DESKTOP_DIR="${HOME}/.local/share/applications"
MAILCAP_DESKTOP_FILE="${MAILCAP_DESKTOP_DIR}/${MAILCAP_DESKTOP}"

# Create .desktop file with mailcap
touch "${MAILCAP_DESKTOP_FILE}"
echo "[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
NoDisplay=true
Exec=run-mailcap %u
Name=run-mailcap
Comment=run-mailcap
" > "${MAILCAP_DESKTOP_FILE}"

# Create mimeapps.list from mailcap known types
mimeTypes=$(cut -d";" -f1 ${MAILCAP_TYPES} | grep -E "^[a-zA-Z]" | sort | uniq)
touch "${MIMEAPPS_LIST}"
echo "[Default Applications]" > "${MIMEAPPS_LIST}"
for mimeType in ${mimeTypes}
do
    echo "${mimeType}=${MAILCAP_DESKTOP}" >> "${MIMEAPPS_LIST}"
done