churn

A Project to give the churn file, class, and method for a project for a given checkin. Over time the tool adds up the history of chruns to give the number of times a file, class, or method is changing during the life of a project. Churn for files is immediate, but classes and methods requires buildings up a history using churn between revisions. The history is stored in ./tmp

Currently has full Git, Mercurial (hg), and Bazaar (bzr) support, and partial SVN support (supports only file level churn currently)

Authors:

• danmayer
• ajwalters
• cldwalker
• absurdhero

CI Build Status

This project runs travis-ci.org

Churn Usage Install with gem install churn or for bundler add to your Gemfile gem 'churn'

• rake:

  • add require 'churn' to Rakefile

  • then runrake churn or bundle exec rake churn

  • use environment variables to control churn defaults

    ENV['CHURN_MINIMUM_CHURN_COUNT']
    ENV['CHURN_START_DATE']
    ENV['CHURN_IGNORE_FILES']
    

• CLI:

  • on command line run churn or bundle exec churn

  • need help run churn -h to get additional information

  • run the executable passing in options to override defaults

    churn -i "churn.gemspec, Gemfile" #ignore files
    churn -y #output yaml format opposed to text
    churn -c 10 #set minimum churn count on a file to 10
    churn -c 5 -y -i "Gemfile" #mix and match
    churn --start_date "6 months ago" #Start looking at file changes from 6 months ago
    

Example Output

**********************************************************************
* Revision Changes
**********************************************************************
Files:
+-------------------------------+
| file                          |
+-------------------------------+
| Rakefile                      |
| lib/churn/churn_calculator.rb |
+-------------------------------+

Classes:
+-------------------------------+-----------------+
| file                          | klass           |
+-------------------------------+-----------------+
| lib/churn/churn_calculator.rb | ChurnCalculator |
+-------------------------------+-----------------+

Methods:
+-------------------------------+-----------------  +-------------------------------+
| file                          | klass           | method                        |
+-------------------------------+-----------------+-------------------------------+
| lib/churn/churn_calculator.rb | ChurnCalculator | ChurnCalculator#filters       |
| lib/churn/churn_calculator.rb | ChurnCalculator | ChurnCalculator#display_array |
| lib/churn/churn_calculator.rb | ChurnCalculator | ChurnCalculator#to_s          |
+-------------------------------+-----------------+-------------------------------+

**********************************************************************
* Project Churn
**********************************************************************
Files:
+------------------------------------+---------------+
| file_path                          | times_changed |
+------------------------------------+---------------+
| lib/churn/churn_calculator.rb      | 14            |
| README.rdoc                        | 7             |
| lib/tasks/churn_tasks.rb           | 6             |
| Rakefile                           | 6             |
| lib/churn/git_analyzer.rb          | 4             |
| VERSION                            | 4             |
| test/test_helper.rb                | 4             |
| test/unit/churn_calculator_test.rb | 3             |
| test/churn_test.rb                 | 3             |
+------------------------------------+---------------+

Classes:
+-------------------------------+-----------------+---------------+
| file                          | klass           | times_changed |
+-------------------------------+-----------------+---------------+
| lib/churn/churn_calculator.rb | ChurnCalculator | 1             |
| lib/churn/churn_calculator.rb | ChurnCalculator | 1             |
+-------------------------------+-----------------+---------------+

Methods:
+-------------------------------+-----------------+-----------------------------------------+---------------+
| file                          | klass           | method                                  | times_changed |
+-------------------------------+-----------------+-----------------------------------------+---------------+
| lib/churn/churn_calculator.rb | ChurnCalculator | ChurnCalculator#to_s                    | 1             |
| lib/churn/churn_calculator.rb | ChurnCalculator | ChurnCalculator#display_array           | 1             |
| lib/churn/churn_calculator.rb | ChurnCalculator | ChurnCalculator#calculate_revision_data | 1             |
| lib/churn/churn_calculator.rb | ChurnCalculator | ChurnCalculator#filters                 | 1             |
| lib/churn/churn_calculator.rb | ChurnCalculator | ChurnCalculator#initialize              | 1             |
| lib/churn/churn_calculator.rb | ChurnCalculator | ChurnCalculator#filters                 | 1             |
| lib/churn/churn_calculator.rb | ChurnCalculator | ChurnCalculator#to_s                    | 1             |
+-------------------------------+-----------------+-----------------------------------------+---------------+

Options

[~/projects/churn] churn -h
NAME
  churn

SYNOPSIS
  churn [options]+

PARAMETERS
--minimum_churn_count=minimum_churn_count, -c (0 ~>  int(minimum_churn_count=3))
--yaml, -y
--ignore_files=[ignore_files], -i (0 ~> string(ignore_files=))
--start_date=[start_date], -s (0 ~> string(start_date=))
--help, -h

TODO:

• SVN only supports file, add full SVN support (method and line numbers)
• add support for cvs, and darcs
• make storage directory configurable instead of using tmp
• allow passing in directories to churn
• add a filter that allows for other files besides. *.rb to get method/class checks
• improve line number matching for Ruby files
• add line number matching for other langauges
• finish adding better documenation using YARD
• rake task for building manpage (currently manually run ronn -b1 README.rdoc)
• don't output methods and classes on a commit that has none detected (css and view only commits, etc)

Notes on Patches/Pull Requests

• Fork the project.
• Make your feature addition or bug fix.
• Add tests for it. This is important so I don't break it in a future version unintentionally.
• Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
• Send me a pull request. Bonus points for topic branches.

Copyright

Copyright (c) 2013 Dan Mayer. See LICENSE for details.