QuickLook for macOS shell

ql.sh

#!/bin/sh

# usage:
#	ql /tmp/file.jpg
#	cat /tmp/file.jpg | ql
#	cal -h | ql

if [ $# = 0 ]; then
	TMP="/tmp/ql.$$.stdin"
	trap 'rm -rf "$TMP" "$TEMP"' 0 1 2 15
	cat >"$TMP"
	mime_type=$(file --brief --mime-type "$TMP")
	extension=$(grep "$mime_type" /etc/apache2/mime.types | awk '{print $2;}')
	if [ -z $extension ]; then
		qlmanage -p "$TMP" 1>/dev/null 2>&1
	else
		FILE="/tmp/ql.$$.$extension"
		mv /tmp/ql.stdin "$FILE"
		qlmanage -p "$FILE" 1>/dev/null 1>&2
	fi
else
	qlmanage -p "$@" 2>/dev/null 1>/dev/null
fi