Class: GitCommitsAnalyzer

Inherits:
Object
  • Object
show all
Defined in:
lib/git-commits-analyzer.rb

Overview

Public: parse git logs for language and commit metadata.

Examples:

git_parser = GitCommitsAnalyzer.new(logger: logger, author: author)

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(logger:, author:) ⇒ GitCommitsAnalyzer

Public: Initialize new GitParser object.

logger - A logger object to display git errors/warnings. author - The email of the git author for whom we should compile the metadata.



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# File 'lib/git-commits-analyzer.rb', line 44

def initialize(logger:, author:)
  @logger = logger
  @author = author
  @commits_by_month = {}
  @commits_by_month.default = 0
  @commits_total = 0
  @lines_by_language = {}
  @commit_hours = 0.upto(23).map{ |x| [x, 0] }.to_h
  @commit_days = {}
  @commit_days.default = 0
  @commit_weekdays_hours = {}
  ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'].each do |weekday|
    @commit_weekdays_hours[weekday] = {}
    0.upto(23).each do |hour|
      @commit_weekdays_hours[weekday][hour] = 0
    end
  end
  @lines_by_month = {}
end

Instance Attribute Details

#commit_days ⇒ Object (readonly)

Public: Returns the tally of commits broken down by day.



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# File 'lib/git-commits-analyzer.rb', line 31

def commit_days
  @commit_days
end

#commit_hours ⇒ Object (readonly)

Public: Returns the tally of commits broken down by hour of the day.



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# File 'lib/git-commits-analyzer.rb', line 28

def commit_hours
  @commit_hours
end

#commit_weekdays_hours ⇒ Object (readonly)

Public: Returns the tally of commits broken down by weekday and hour.



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# File 'lib/git-commits-analyzer.rb', line 34

def commit_weekdays_hours
  @commit_weekdays_hours
end

#commits_by_month ⇒ Object (readonly)

Public: Returns a hash of commit numbers broken down by month.



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# File 'lib/git-commits-analyzer.rb', line 18

def commits_by_month
  @commits_by_month
end

#commits_total ⇒ Object (readonly)

Public: Returns the total number of commits belonging to the author specified.



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# File 'lib/git-commits-analyzer.rb', line 22

def commits_total
  @commits_total
end

#lines_by_language ⇒ Object (readonly)

Public: Returns the number of lines added/removed broken down by language.



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# File 'lib/git-commits-analyzer.rb', line 25

def lines_by_language
  @lines_by_language
end

#lines_by_month ⇒ Object (readonly)

Public: Returns the lines added/changed by month.



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# File 'lib/git-commits-analyzer.rb', line 37

def lines_by_month
  @lines_by_month
end

Class Method Details

.determine_language(filename:, sha:, git_repo:) ⇒ Object

Public: Determine the type of a file at the given revision of a repo.

filename - The name of the file to analyze. sha - The commit ID. git_repo - A git repo object corresponding to the underlying repo.

Returns a string corresponding to the language of the file.



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# File 'lib/git-commits-analyzer.rb', line 102

def self.determine_language(filename:, sha:, git_repo:)
  return nil if filename == 'LICENSE'

  # First try to match on known extensions.
  case filename
  when /\.xml$/i
    return 'XML'
  when /\.go$/i
    return 'Golang'
  when /\.(pl|pm|t|cgi|pod|run)$/i
    return 'Perl'
  when /\.(?:rb|gemspec)$/
    return 'Ruby'
  when /(?:\/|^)Rakefile$/
    return 'Ruby'
  when /\.md$/
    return 'Markdown'
  when /\.json$/
    return 'JSON'
  when /\.(yml|yaml)$/
    return 'YAML'
  when /\.?(perlcriticrc|githooksrc|ini|editorconfig|gitconfig)$/
    return 'INI'
  when /\.css$/
    return 'CSS'
  when /\.(tt2|html)$/
    return 'HTML'
  when /\.sql$/
    return 'SQL'
  when /\.py$/
    return 'Python'
  when /\.js$/
    return 'JavaScript'
  when /\.c$/
    return 'C'
  when /\.sh$/
    return 'bash'
  when /(bash|bash_\w+)$/
    return 'bash'
  when /\.?(SKIP|gitignore|txt|csv|vim|gitmodules|gitattributes|jshintrc|gperf|vimrc|psqlrc|inputrc|screenrc|curlrc|wgetrc|selected_editor|dmrc|netrc)$/
    return 'Text'
  when /(?:\/|^)(?:LICENSE|LICENSE-\w+)$/
    return nil
  when /\.(?:0|1|VimballRecord)$/
    return nil
  when /^vim\/doc\/tags$/
    return nil
  when /(?:\/|^)(?:README|MANIFEST|Changes|Gemfile|Gemfile.lock|CHANGELOG)$/
    return 'Text'
  end

  # Next, retrieve the file content and infer from that.
  begin
    content = git_repo.show(sha, filename)
  rescue
    pp "#{$!}"
  end
  return nil if content == nil || content == ''

  first_line = content.split(/\n/)[0] || ''
  case first_line
  when /perl$/
    return 'Perl'
  when /ruby$/
    return 'Ruby'
  when /^\#!\/usr\/bin\/bash$/
    return 'Ruby'
  end

  # Fall back on the extension in last resort.
  extension = /\.([^\.]+)$/.match(filename)
  return filename if extension.nil?
  return nil if extension[0] == 'lock'
  return extension[0]
end

.is_library(filename:) ⇒ Object

Public: Determine if the file is a common library that shouldn’t get counted towards contributions.

filename - The name of the file to analyze.

Returns a boolean indicating if the file is a common library.



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# File 'lib/git-commits-analyzer.rb', line 71

def self.is_library(filename:)
  case filename
  when /jquery-ui-\d+\.\d+\.\d+\.custom(?:\.min)?\.js$/
    return true
  when /jquery-\d+\.\d+\.\d+(?:\.min)?\.js$/
    return true
  when /jquery\.datepick(?:\.min)?\.js$/
    return true
  when /chart\.min\.js$/
    return true
  when /jquery\.js$/
    return true
  when /jquery-loader\.js$/
    return true
  when /qunit\.js$/
    return true
  when /d3\.v3(?:\.min)?\.js$/
    return true
  else
    return false
  end
end

Instance Method Details

#get_month_scale ⇒ Object

Public: Get a range of months from the earliest commit to the latest.

Returns an array of “YYYY-MM” strings.



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# File 'lib/git-commits-analyzer.rb', line 276

def get_month_scale()
  month_scale = []
  commits_start = @commits_by_month.keys.sort.first.split('-').map { |x| x.to_i }
  commits_end = @commits_by_month.keys.sort.last.split('-').map { |x| x.to_i }
  commits_start[0].upto(commits_end[0]) do |year|
    1.upto(12) do |month|
      next if month < commits_start[1] && year == commits_start[0]
      next if month > commits_end[1] && year == commits_end[0]
      month_scale << [year, month]
    end
  end

  return month_scale
end

#parse_repo(repo:) ⇒ Object

Public: Parse the git logs for a repo.

repo - A git repo object corresponding to the underlying repo.

This method adds the metadata extracted for this repo to the instance variables collecting commit metadata.



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# File 'lib/git-commits-analyzer.rb', line 185

def parse_repo(repo:)
  # Support both standard and bare/mirror git repositories.
  git_repo = if File.directory?(File.join(repo, '.git'))
    then Git.open(repo, log: @logger)
    else Git.bare(repo, log: @logger)
    end

  # Note: override the default of 30 for count(), nil gives the whole git log
  # history.
  git_repo.log(count = nil).each do |commit|
    # Only include the authors specified on the command line.
    next if !@author.include?(commit.author.email)

    # Parse commit date and update the corresponding stats.
    commit_datetime = DateTime.parse(commit.author.date.to_s)
    commit_hour = commit_datetime.hour
    @commit_hours[commit_hour] += 1
    commit_day = commit_datetime.strftime('%Y-%m-%d')
    @commit_days[commit_day] += 1
    commit_weekday = commit_datetime.strftime('%a')
    @commit_weekdays_hours[commit_weekday][commit_hour] += 1

    # Note: months are zero-padded to allow easy sorting, even if it's more
    # work for formatting later on.
    commit_month = commit.date.strftime("%Y-%m")

    # Parse diff and analyze patches to detect language.
    diff = git_repo.show(commit.sha)
    diff.encode!('UTF-8', 'binary', invalid: :replace, undef: :replace, replace: '')

    file_properties = git_repo.ls_tree(['-r', commit.sha])

    languages_in_commit = {}
    patches = GitDiffParser.parse(diff)
    patches.each do |patch|
      # Skip submodules.
      next if file_properties['commit'].has_key?(patch.file);

      # Skip symlinks.
      next if file_properties['blob'].has_key?(patch.file) &&
        (file_properties['blob'][patch.file][:mode] == '120000')

      # Skip libraries.
      next if self.class.is_library(filename: patch.file)

      body = patch.instance_variable_get :@body
      language = self.class.determine_language(filename: patch.file, sha: commit.sha, git_repo: git_repo)
      next if language.nil?
      @lines_by_language[language] ||=
      {
        'added'   => 0,
        'deleted' => 0,
        'commits' => 0,
      }
      languages_in_commit[language] = true

      @lines_by_month[commit_month] ||=
      {
        'added'   => 0,
        'deleted' => 0,
      }

      body.split(/\n/).each do |content|
        if (/^[+-]/.match(content) && !/^[+-]\s+$/.match(content))
          if (/^\+/.match(content))
            @lines_by_language[language]['added'] += 1
            @lines_by_month[commit_month]['added'] += 1
          elsif (/^\-/.match(content))
            @lines_by_language[language]['deleted'] += 1
            @lines_by_month[commit_month]['deleted'] += 1
          end
        end
      end
    end

    languages_in_commit.keys.each do |language|
      @lines_by_language[language]['commits'] += 1
    end

    # Add to stats for monthly commit count.
    @commits_by_month[commit_month] += 1

    # Add to stats for total commits count.
    @commits_total += 1
  end
end

#to_json(pretty: true) ⇒ Object

Public: Generate a JSON representation of the parsed data.

Returns: a JSON string.



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# File 'lib/git-commits-analyzer.rb', line 295

def to_json(pretty: true)
  formatted_commits_by_month = []
  formatted_lines_by_month = []
  month_names = Date::ABBR_MONTHNAMES
  self.get_month_scale.each do |frame|
    display_key = month_names[frame[1]] + '-' + frame[0].to_s
    data_key = sprintf('%s-%02d', frame[0], frame[1])

    count = @commits_by_month[data_key]
    formatted_commits_by_month << {
      month: display_key,
      commits: count.to_i,
    }

    month_added_lines = 0
    month_deleted_lines = 0
    if @lines_by_month.key?(data_key)
      month_added_lines = @lines_by_month[data_key]['added'].to_i
      month_deleted_lines = @lines_by_month[data_key]['deleted'].to_i
    end
    formatted_lines_by_month << {
      month: display_key,
      added: month_added_lines,
      deleted: month_deleted_lines,
    }
  end

  data =
    {
      commits_total: @commits_total,
      commits_by_month: formatted_commits_by_month,
      commits_by_hour: @commit_hours,
      commits_by_day: @commit_days,
      commit_by_weekday_hour: @commit_weekdays_hours,
      lines_by_language: @lines_by_language,
      lines_by_month: formatted_lines_by_month,
    }

  if pretty
    JSON.pretty_generate(data)
  else
    JSON.generate(data)
  end
end