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+#!/bin/sh
+
+# useful links
+# https://stackoverflow.com/questions/3430330/best-way-to-make-a-shell-script-daemon
+# https://serverfault.com/questions/117152/do-background-processes-get-a-sighup-when-logging-off
+# https://wiki.archlinux.org/title/default_applications
+
+# I don't care about errors, I don't want to handle errors, just shut up please.
+# nohup seems not necessary if don't care about daemon SIGHUP requirement
+
+# when close a shell script's stdout or stderr with `>&-` or `2>&-`, `xsel -ib` in that script has no effect
+# https://github.com/kfish/xsel/issues/43
+# using `>&-` or `2>&-` doesn't completely close mpv's output when run sth. like `o mpv file.mkv`
+# base on above observations, I choose to use `>/dev/null 2>&1` instead
+
+# need ; before } when it is in the same line as { ? https://www.shellcheck.net/wiki/SC1056
+
+if [ $# -eq 1 ] && [ -e "$1" ] && { ! [ -x "$1" ] || [ -d "$1" ];}; then
+	case "$1" in
+		# libreoffice, please don't let firefox eat your shit
+		*.docx|*.pptx) cmd=libreoffice;;
+		*) cmd=xdg-open;;
+	esac
+	nohup "$cmd" "$1" 0<&- >/dev/null 2>&1 &
+else
+	nohup "$@" 0<&- >/dev/null 2>&1 &
+fi