List VCL variable availability for 4.0

print_vcl_vars.py

#!/usr/bin/env python

# Simple script that outputs all available VCL variables 
# available in the various functions in 4.0 VCL.
#
# Execute this from the lib/libvcc directory of the varnish-cache 
# master branch

from collections import defaultdict
from generate import sp_variables, returns

def printvars(vars):
    if len(vars['r']) > 0:
        print "  R:"
        print " ",
        print "\n   ".join(vars['r'])

    if len(vars['w']) > 0:
        print "  W:"
        print " ",
        print "\n   ".join(vars['w'])

    print ""

def dict_factory():
    return {'r': [], 'w': []}

vcl_funcvars = defaultdict(dict_factory)

for var in sp_variables:
    for func in var[2]:
        vcl_funcvars[func]['r'].append(var[0])
    for func in var[3]:
        vcl_funcvars[func]['w'].append(var[0])

funcs = [ { 'name': x[0], 'class': x[1] } for x in returns ]

for x in [ 'all', 'client', 'backend' ]:
    print x
    printvars(vcl_funcvars[x])

for func in funcs:
    print "%s: %s" % (func['name'], func['class'])
    printvars(vcl_funcvars[func['name']])