flay

https://github.com/seattlerb/flay

Flay analyzes code for structural similarities. Differences in literal values, variable, class, method names, whitespace, programming style, braces vs do/end, etc are all ignored. Making this totally rad. == Features/Problems: * Reports differences at any level of code. * Adds a score multiplier to identical nodes. * Differences in literal values, variable, class, and method names are ignored. * Differences in whitespace, programming style, braces vs do/end, etc are ignored. * Works across files. * Add the flay-persistent plugin to work across large/many projects. * Run --diff to see an N-way diff of the code. * Provides conservative (default) and --liberal pruning options. * Provides --fuzzy duplication detection. * Language independent: Plugin system allows other languages to be flayed. * Ships with .rb and .erb. * javascript and others will be available separately. * Includes FlayTask for Rakefiles. * Uses path_expander, so you can use: * dir_arg -- expand a directory automatically * @file_of_args -- persist arguments in a file * -path_to_subtract -- ignore intersecting subsets of files/directories * Skips files matched via patterns in .flayignore (subset format of .gitignore). * Totally rad.