A simple utility for moving and renaming Ruby/Rails app and spec code with one command.

mvrb.py

#!/usr/bin/env python
"""
mvrb

A simple utility to move and rename Rails app and spec code

Usage:
  mvrb services/widget_extractor concepts/widget_concatenator

Would move app/services/widget_extractor.rb to app/concepts/widget_concatenator.
Would also move spec/services/widget_extractor_spec.rb and rename classes.

"""

import os
import shutil
import sys


APP_PATH = "app/{path}.rb".format
SPEC_PATH = "spec/{path}_spec.rb".format


def mvrb(old_path, new_path):
    move_code_to_new_path(old_path, new_path)
    replace_classnames(old_path, new_path)


def move_code_to_new_path(old_path, new_path):
    def move_file(old_full_path, new_full_path):
        shutil.move(old_full_path, new_full_path)

    move_file(APP_PATH(path=old_path), APP_PATH(path=new_path))
    move_file(SPEC_PATH(path=old_path), SPEC_PATH(path=new_path))


def replace_classnames(old_path, new_path):
    old_classname = classname_from_path(old_path)
    new_classname = classname_from_path(new_path)

    rename_classname(old_classname, new_classname, APP_PATH(path=new_path))
    rename_classname(old_classname, new_classname, SPEC_PATH(path=new_path))


def classname_from_path(path):
    _, filename = os.path.split(path)

    return filename.title().replace('_', '')


def rename_classname(old_classname, new_classname, path):
    with open(path) as open_file:
        old_contents = open_file.read()

    new_contents = old_contents.replace(old_classname, new_classname)

    with open(path, 'w') as open_file:
       open_file.write(new_contents)


if __name__ == '__main__':
  old_path, new_path = sys.argv[1:3]
  mvrb(old_path, new_path)