#!/usr/bin/python2

print """
Variable Grabbler - version 3.1
-------------------------------"""

# definitions
import os, json, sys

if not len(sys.argv)==3:
  print >> sys.stderr, "Error: Exactly two arguments required: \"python variable_grabbler.py <file to be rewritten> <config file>\""
  sys.exit(1)

print "Reading config file...",
config_file = open(sys.argv[2],"r")
config_values = json.loads(config_file.read().decode("utf-8"))
config_file.close()
print "Done."

print "Working on file: "+sys.argv[1]
for variable in config_values:
  print "> "+variable+" => ",
  file_in = open(sys.argv[1], "r")
  file_content = file_in.read()
  file_in.close()
  if config_values[variable][0] == "file":
    print "Found array. Adding file instead: " + config_values[variable][1]
    file_replacement = open(config_values[variable][1], "r")
    replacement = file_replacement.read()
    file_replacement.close()
  elif config_values[variable][0] == "exec":
    print "Found array. Executing command instead: " + config_values[variable][1]
    #Add code to replace variable with command output here
    print >> sys.stderr, "Error: This option is not yet supported."
    replacement = ""
  else:
    replacement = config_values[variable]
    print "\"" + replacement + "\""
  file_out = open(sys.argv[1], "w")
  file_out.write(file_content.decode('utf-8').replace("%" + variable + "%", replacement).encode('utf-8'))
  file_out.close()
print "Done."