Generate churn vs. complexity graphs for ManageIQ

churn_vs_complexity.rb

require 'yaml'
require 'csv'
require 'parallel'

yml = `churn -d "07/15/15" -y`
changes = YAML.load(yml)[:churn][:changes]

require "csv"

def ignored?(file_path)
  return true unless file_path.end_with?(".rb")
  return true if file_path.start_with?("spec")
  return true if file_path.start_with?("test")
  return true if file_path.start_with?("db/migrate")
  return true unless File.file?(file_path)
  false
end

# run just the first 20 or so churn files
# changes = changes[0..20]

results = Parallel.map(changes, in_processes: 8) do |change|
  next if ignored?(change[:file_path])
  puts "file_path: #{change[:file_path]}"

  output = `flog -sq #{change[:file_path]}`
  flog_total = /([0-9]+\.[0-9]+): flog total/.match(output)[1]
  flog_method_avg = /([0-9]+\.[0-9]+): flog\/method average/.match(output)[1]
  puts "file_path: #{change[:file_path]}, changes: #{change[:times_changed]}, flog total: #{flog_total}, flog method avg: #{flog_method_avg}"
  [change[:file_path], change[:times_changed], flog_total, flog_method_avg]
end

# remove ignored files
results.compact!

ui_csv      = CSV.open("churn_vs_complexity_controllers_helpers.csv", "wb")
backend_csv = CSV.open("churn_vs_complexity_backend.csv", "wb")
ui_csv << ["file_path", "times_changed", "flog_total", "flog_method_avg"]
backend_csv << ["file_path", "times_changed", "flog_total", "flog_method_avg"]

results.each do |r|
  if /app\/helpers|app\/controllers|app\/presenters/.match(r[0])
    ui_csv << r
  else
    backend_csv << r
  end
end

ui_csv.close
backend_csv.close