ambiguous.rb

#!/usr/bin/env ruby

LOOK = `which look 2>/dev/null`.strip

abort "#{$0} requires |look| executable command" unless File.executable?(LOOK)

def calculate_clarity(word)
  candidates = `#{LOOK} -f #{word}`.strip.lines
  $?.success? ? candidates.count : 0
end

require "ruby_parser"

target_file = ARGF

sexp_tree = Ruby19Parser.new.parse(target_file.read)

definition_nodes = [:class, :cdecl, :lasgn, :args]

define_names = definition_nodes.flat_map {|node| sexp_tree.enum_for(:each_of_type, node).map {|exp| exp[1] } }
define_clarities = define_names.map {|name| calculate_clarity(name) }
definitions = define_names.zip(define_clarities)

threshold = 20

too_ambiguous_names = definitions.select {|name, clarity| clarity >= threshold }

if $0 == __FILE__
  too_ambiguous_names.each do |name, clarity|
    puts "#{name} => #{clarity}"
  end
end