Find all programs associated with a MIME type
Solution 1:
Here's a short Python program for that:
#!/usr/bin/env python3
from gi.repository import Gio
import sys
if len(sys.argv) != 2:
print('Error: Exactly one command line argument needed')
sys.exit(1)
for app in Gio.app_info_get_all_for_type(sys.argv[1]):
print(app.get_id())
Save that in a file, e.g. /usr/local/bin/mimeapps. Then you can use it like
$ mimeapps text/plain
emacs.desktop
libreoffice-writer.desktop
pluma.desktop
vim.desktop