open

map.json

{
	"file" : {
		"py":"subl",
		"java":"subl",
		"cpp":"subl",
		"cxx":"subl",
		"hpp":"subl",
		"h":"subl",
		"c":"subl",
		"sh":"subl",

		"xml":"subl",
		"properties":"subl",
		"json":"subl",

		"dia":"dia",

		"png":"eog",
		"jpeg":"eog",
		"jpg":"eog",

		"pdf":"evince",

		"doc":"libreoffice",

		"html":"chromium"
	},
	"dir" : "nautilus"
}

open.py

#!/usr/bin/python

import sys
import os
import subprocess
import json

MAP_FILE_NAME = "./map.json"

def main(arguments):

	commands = processCommands(arguments)

	executeCommands(commands)

	sys.exit(0)

def processCommands(values):
	extensionMap = getMap()
	values = values[1:] # remove script invokation
	assignation = {value : getProgramOf(value, extensionMap) for value in values}
	commands = [toCommand(value, program) for value, program in assignation.iteritems()]
	return commands

def executeCommands(commands):
	for command in commands:
		print command
		subprocess.call(command, shell=True)	

def toCommand(value, program):
	return program + " " + value

def getProgramOf(value, extensionMap):
	if os.path.isdir(value):
		return extensionMap['dir']
	elif os.path.isfile(value) or not os.path.exists(value):
		if os.sep in value:
			split = value.split(os.sep)
			filepath, filenameComplete = split[:-1], split[-1]
		else:
			filepath, filenameComplete = "", value

		if "." in filenameComplete:
			split = value.split(".")
			filename, extension = split[:-1], split[-1]
		else:
			filename, extension = value, ""

		program = extensionMap['file'][extension]
		return program
	else:
		assert False

def getMap():
	file = getMapFile()
	content = file.read()
	extensionMap = json.loads(content)
	return extensionMap

def getMapFile():
	return open(MAP_FILE_NAME, 'r')

if __name__ == "__main__":
	main(sys.argv)

open.sh

#!/bin/sh

output=$(python ./open.py "$@")