Remove unused classes and IDs

un-id.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'tempfile'
require 'fileutils'
require 'set'
require 'pry'

# run with:
#   `ruby un-id.rb`

# ---------------------------------------------------------------------------
# Configure these variables to match your file structure
# ---------------------------------------------------------------------------

@css_file_path = '/Users/ea/go/src/github.com/honeycombio/hound/cmd/poodle/static/dist/main.d0f9d93462974fcd988c.css'
@html_dir_paths = ['/Users/ea/go/src/github.com/honeycombio/hound/cmd/poodle/templates', '/Users/ea/go/src/github.com/honeycombio/hound/cmd/poodle/javascript']
@result_file_name = 'result_' + Time.now.strftime("%Y%m%d-%H%M") + '.txt'

# ---------------------------------------------------------------------------
# Nothing to configure below this line
# ---------------------------------------------------------------------------
@selectors = Set.new
@template_lines = Set.new

def find_selectors
  source = File.expand_path(@css_file_path, __FILE__)
  File.foreach(source) { |line| find_selectors_by_line(line) }
end

def find_selectors_by_line(line)
  # check for multiple matches per line
  while m = line.match(/(\.|\#)[_a-zA-Z]+[_a-zA-Z0-9-]*/)
    @selectors << m.to_s
    log("found selector", m.to_s)
    line.gsub!(m.to_s, '')
  end
end

def check_selectors
  find_template_lines_with_classes_or_ids
  @selectors.each do |selector|
    unless selector_found_in_any_file?(selector)
      log("potentially unused selector:", selector)
      append_result(selector)
    end
  end
end

def find_template_lines_with_classes_or_ids
  @html_dir_paths.each do |dir|
    html_dir = File.expand_path(dir, __FILE__)

    Dir.glob(html_dir + "/**/*").each do |file|
      if !File.directory?(file) && %w{.js .jsx .tmpl}.include?(File.extname(file))
        File.foreach(file) do |line|
          if line.match(/(class=|id=|className=)/)
            log("line:", line)
            log("filename:", file)
            @template_lines << line
          end
        end
      end
    end
  end
end

def selector_found_in_any_file?(selector)
  s = strip_selector_chars(selector)
  @template_lines.each do |line|
    if line.match(/(class=|id=|className=).*("|\s)#{s}("|\s)/).to_s != ""
      log("found:", line, s)
      return true
    end
  end
end

def strip_selector_chars(selector)
  selector.gsub('.','').gsub('#','')
end


def append_result(selector)
  print '.'
  File.open(@result_file_name, 'a+') { |f| f.puts(selector) }
end

def log(*args)
  puts(args)
end

# ---------------------------------------------------------------------------
# run script
# ---------------------------------------------------------------------------

log "finding selectors"
find_selectors
log "checking selectors"
check_selectors

# ---------------------------------------------------------------------------
# post-processing to do in the shell...
# ---------------------------------------------------------------------------

`sort #{@result_file_name} | uniq > latest_results.txt`