Seeks out doppelganger's in your codes.
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README.rdoc

Doppelganger

by Brian Landau of Viget Labs <brian.landau@viget.com>

GitHub Project

github.com/brianjlandau/doppelganger

RubyForge Project

rubyforge.org/projects/doppelganger/

RDoc

doppelganger.rubyforge.org/

DESCRIPTION:

Doppelganger helps you to find areas of your code that are good places to refactor.

It does this by finding methods and blocks that are duplicates or have less then a set threshold level of difference or be less then a specified percent different. This library can either be used with in another larger code metric/heuristic library, or called from the command line.

FEATURES:

  • Find duplicate methods and blocks.

  • Find methods and blocks similar by a threshold level of difference.

  • Find methods and blocks similar by threshold percentage.

  • Uses the Diff::LCS library for finding differences.

  • Uses RubyParser to compare methods.

  • Outputs the set of similar/duplicate nodes together and what files they are in and their line numbers.

CAVEATS:

Doing the Diff::LCS on all the flattened Sexps is a very time consuming and processor intense operation. This means doing the “diff” or “percent_diff” comparisons on large libraries can take a very long time.

REQUIREMENTS:

  • ruby_parser

  • sexp_processor

  • Diff::LCS

  • Ruby2Ruby

  • HighLine

  • Facets

USAGE:

Find duplicates and methods have 5 or less differences.

$ doppelganger -n 5 project_dir/lib

Find duplicates and methods that are 10 percent different or less.

$ doppelganger -p 10 project_dir/lib

INSTALL:

sudo gem install doppelganger

CREDITS:

Inspired and based off of Giles Bowkett's Towelie.

Parts also influenced or extracted by Ryan Davis' Flay.