module MetricFu
class Churn
class << self
def generate_report(output_dir, options)
date_range, minimum_churn_count, source_control_type = churn_options(options)
changes = parse_log_for_changes(source_control_type, date_range)
changes.reject! {|file, change_count| change_count < minimum_churn_count}
write_churn_file(changes, output_dir)
end
private
def parse_log_for_changes(source_control_type, date_range)
changes = {}
logs = get_logs(source_control_type, date_range)
logs.each do |line|
changes[line] ? changes[line] += 1 : changes[line] = 1
end
changes
end
def get_logs(source_control_type, date_range)
if source_control_type == :git
`git log #{date_range} --name-only --pretty=format:`.split(/\n/).reject{|line| line == ""}
else
`svn log #{date_range} --verbose`.split(/\n/).map { |line| clean_up_svn_line(line) }.compact
end
end
def clean_up_svn_line(line)
m = line.match(/\W*[A,M]\W+(\/.*)\b/)
m ? m[1] : nil
end
def churn_options(options)
if options[:start_date]
require RAILS_ROOT + '/config/environment'
if options[:scm] == :git
date_range = "--after=#{options[:start_date].call.strftime('%Y-%m-%d')}"
else
date_range = "--revision {#{options[:start_date].call.strftime('%Y-%m-%d')}}:{#{Time.now.strftime('%Y-%m-%d')}}"
end
else
date_range = ""
end
minimum_churn_count = options[:minimum_churn_count] ? options[:minimum_churn_count] : 5
scm = options[:scm] == :git ? :git : :svn
return date_range, minimum_churn_count, scm
end
def write_churn_file(changes, output_dir)
FileUtils.mkdir_p(output_dir, :verbose => false) unless File.directory?(output_dir)
File.open("#{output_dir}/index.html", "w+") do |file|
file << CHURN_FILE_BEGINING
changes.to_a.sort {|x,y| y[1] <=> x[1]}.each do |change|
file << "| #{change[0]} | #{change[1]} |
\n"
end
file << CHURN_FILE_END
end
end
end
CHURN_FILE_BEGINING = <<-EOS
Source Control Churn Results
Source Control Churn Results
| File Path | Times Changed |
|---|
EOS
CHURN_FILE_END = <<-EOS
EOS
end
end