Show covered files from SimpleCov result html

covered-files-from-simplecov.rb

# Show covered files from SimpleCov result html
#
# Usage:
#
# ruby covered-files-from-simplecov.rb index.html
#
require 'nokogiri'

THRESHOLD = 100

class SimpleCovHTMLDocument < Nokogiri::XML::SAX::Document
  attr_reader :files

  def initialize
    @in_t_file = false
    @in_t_file_coverage = false
    @file = nil
    @files = {}
    super
  end

  def start_element(name, attributes = [])
    attrs = attributes.to_h

    if name == 'tr' && attrs['class'] == 't-file'
      @in_t_file = true
    end

    if @in_t_file && name == 'a'
      @file = attrs['title']
    end

    if @in_t_file && name == 'td' && attrs['class'].include?('t-file__coverage')
      @in_t_file_coverage = true
    end
  end

  def characters(string)
    return unless @in_t_file_coverage

    @files[@file] = string.to_f
  end

  def end_element(name)
    @in_t_file = false if @in_t_file && name == 'tr'
    @in_t_file_coverage = false if @in_t_file_coverage && name == 'td'
  end
end

doc = SimpleCovHTMLDocument.new
parser = Nokogiri::XML::SAX::Parser.new(doc)
parser.parse(File.open(ARGV[0]))

doc.files.each do |file, coverage|
  puts file if THRESHOLD <= coverage
end