nnn/plugins/xdgdefault

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#!/usr/bin/env sh
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# Description: Sets the xdg-open's default application for the current entry's file
# type. ${XDG_DATA_DIRS} and ${XDG_DATA_HOME} are set to the recommended
# defaults if unset, as specified in XDG Base Directory Specification
# - http://specifications.freedesktop.org/basedir-spec/.
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#
# Dependencies: xdg-utils, fzf or dmenu (GUI)
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#
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# Shell: POSIX compliant
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# Author: lwnctd
# set to 1 to enable GUI apps
GUI="${GUI:-0}"
if [ "$GUI" -ne 0 ] && command -v dmenu >/dev/null 2>& 1; then
menu="dmenu -l 7"
elif command -v fzf > /dev/null 2>& 1; then
menu="fzf -e --tiebreak=begin"
fi
if [ -z "$1" ] || [ -z "$menu" ] > /dev/null 2>& 1; then
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exit 1
fi
ftype=$(xdg-mime query filetype "$2/$1")
if [ -z "$ftype" ]; then
exit 1
fi
dirs=${XDG_DATA_DIRS:-/usr/local/share:/usr/share}
dirs=${dirs}:${XDG_DATA_HOME:-$HOME/.local/share}:
while [ -n "$dirs" ]; do
d=${dirs%%:*}
if [ -n "$d" ] && [ -d "$d"/applications ]; then
set -- "$@" "$d"/applications
fi
dirs=${dirs#*:}
done
app=$(find "$@" -iname '*.desktop' -exec grep '^Name=' {} + \
| sort -u -t ':' -k 1,1 \
| sed -E 's;.+/(.+desktop):Name=(.+);\2:\1;' \
| sort -t ':' -k 1,1 \
| column -t -s ':' -o "$(printf '\t')" \
| $menu \
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| cut -f 2)
if [ -n "$app" ]; then
xdg-mime default "$app" "$ftype"
fi