Open a file by association. -o to open -e to edit.

open.sh

#!/bin/bash
#long file extension usually means it's a text
SELF="$(cd ${0%/*} && echo $PWD/${0##*/})"
if [[ $1 == "-o" ]]; then
	a="$HOME/.association"
	text="vim -u /usr/share/vim/vim73/macros/less.vim"
	default="xdg-open"
elif [[ $1 == "-e" ]]; then
	a="$HOME/.associationedit"
	text="vim"
	default="$SELF -o"
fi

f=$2
ext=`basename "$2" | awk -F"." '{ print $NF }'`
regexurl='^(http|https|ftp)\://'
if [[ $2 =~ $regexurl ]]; then
	f=`mktemp`
	mv $f $f.$ext
	f="$f.$ext"
	wget -q -O $f "$2"
fi

p=`cat $a | grep -iE -B 1 "(^$ext | $ext | $ext$|^$ext$)" | head -n 1`
l=`echo -e "$p\c" | wc -m`

if [[ $l -gt 0  ]]; then
	$p "$f"
else
	l=`echo -e "$ext\c" | wc -m`
	if [[ $l -gt 4 ]]; then
		$text "$f"
	else
		$default "$f"
	fi
fi