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How to Setup an Application Using Xdg Mime

Fleeting

xdg

Using drawio as an example.

Make sure the mimetype is recognized updating globs (see here to use the magic matching).

IFS=:
for i in ${XDG_DATA_DIRS}:${XDG_DATA_HOME}
do
    cat $i/mime/globs
done|grep drawio

application/vnd.jgraph.mxfile:*.drawio

You can run mimeopen -d (from libfile-mimeinfo-perl) to create the desktop file and the association.

Then you get the association in the mimeapps file.

grep drawio ${XDG_CONFIG_HOME}/mimeapps.list

application/vnd.jgraph.mxfile=drawio-usercreated-1.desktop;

You can rename and move it to your convenience.

IFS=: read -a p <<< "${XDG_DATA_DIRS}:${XDG_DATA_HOME}"
for i in "${p[@]}"
do
    if test -e ${i}/applications && ls ${i}/applications | grep -q drawio
    then
        echo found in ${i}
    fi
done

found in somedirectory/share