Class: Turbulence::Calculators::Churn

Inherits:
Object
  • Object
show all
Defined in:
lib/turbulence/calculators/churn.rb

Constant Summary collapse

RUBY_FILE_EXTENSION = 
".rb"

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.commit_range ⇒ Object

Returns the value of attribute commit_range.



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# File 'lib/turbulence/calculators/churn.rb', line 7

def commit_range
  @commit_range
end

.compute_mean ⇒ Object

Returns the value of attribute compute_mean.



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# File 'lib/turbulence/calculators/churn.rb', line 7

def compute_mean
  @compute_mean
end

.scm ⇒ Object

Returns the value of attribute scm.



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# File 'lib/turbulence/calculators/churn.rb', line 7

def scm
  @scm
end

Class Method Details

.calculate_mean_of_churn(churn, sample_size) ⇒ Object 



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# File 'lib/turbulence/calculators/churn.rb', line 27

def calculate_mean_of_churn(churn, sample_size) 
  return churn if sample_size < 1
  churn /= sample_size
end

.changes_by_ruby_file ⇒ Object 



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# File 'lib/turbulence/calculators/churn.rb', line 15

def changes_by_ruby_file
  ruby_files_changed_in_scm.group_by(&:first).map do |filename, stats|
    churn_for_file(filename,stats)
  end
end

.churn_for_file(filename, stats) ⇒ Object 



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# File 'lib/turbulence/calculators/churn.rb', line 21

def churn_for_file(filename,stats)
  churn = stats[0..-2].map(&:last).inject(0){|running_total, changes| running_total + changes}
  churn = calculate_mean_of_churn(churn, stats.size - 1) if compute_mean
  [filename, churn]
end

.counted_line_changes_by_file_by_commit ⇒ Object 



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# File 'lib/turbulence/calculators/churn.rb', line 38

def counted_line_changes_by_file_by_commit
  scm_log_file_lines.map do |line|
    adds, deletes, filename = line.split(/\t/)
    [filename, adds.to_i + deletes.to_i]
  end
end

.for_these_files(files) ⇒ Object 



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# File 'lib/turbulence/calculators/churn.rb', line 9

def for_these_files(files)
  changes_by_ruby_file.each do |filename, count|
    yield filename, count if files.include?(filename)
  end
end

.ruby_files_changed_in_scm ⇒ Object 



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# File 'lib/turbulence/calculators/churn.rb', line 32

def ruby_files_changed_in_scm
  counted_line_changes_by_file_by_commit.select do |filename, _|
    filename.end_with?(RUBY_FILE_EXTENSION) && File.exist?(filename)
  end
end

.scm_log_command ⇒ Object 



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# File 'lib/turbulence/calculators/churn.rb', line 49

def scm_log_command
  scm.log_command(commit_range)
end

.scm_log_file_lines ⇒ Object 



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# File 'lib/turbulence/calculators/churn.rb', line 45

def scm_log_file_lines
  scm_log_command.each_line.reject{|line| line == "\n"}.map(&:chomp)
end