Refactor Cayley LinkedQL steps

codemod.py

import re

directory = "query/linkedql/"
with open(directory + "steps.go") as file:
    content = file.read()

def convert(name):
    s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
    return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()

separator = "var _ IteratorStep = (*"
for part in content.split(separator):
    step_name = part.split("\n")[0].replace(")(nil)", "")
    if step_name == "package linkedql":
        continue
    header = """
package linkedql

import (
	"github.com/cayleygraph/cayley/graph"
	"github.com/cayleygraph/cayley/graph/iterator"
	"github.com/cayleygraph/cayley/query"
	"github.com/cayleygraph/cayley/query/path"
	"github.com/cayleygraph/quad"
	"github.com/cayleygraph/quad/voc"
)

func init() {
	Register(&%s{})
}

""" % (step_name)
    step_code = header + separator + part
    path = directory + "steps/" + convert(step_name) + ".go"
    with open(path, 'w+') as file:
        file.write(step_code)