File: README — Documentation for churn (0.0.28)

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.