Which figure files are not used during LaTeXing?

not-used-fig.rb

#! /usr/bin/ruby

require "fileutils"

if ARGV.length != 2
  puts <<-"EOD"
Which figure files are not used during LaTeXing?
Usage: ruby not-used-fig.rb LOGDIR FIGDIR
Example: ruby not-used-fig.rb . fig
LOGDIR contains *.log files.
FIGDIR contains figure files.
  EOD
  abort
end

LOGDIR = ARGV[0]
FIGDIR = ARGV[1]

Dir.chdir(LOGDIR)

logs = Dir.glob("*.log")

exist_figs = []
exist_figs += Dir.glob("#{FIGDIR}/*.png")
exist_figs += Dir.glob("#{FIGDIR}/*.jpg")
exist_figs += Dir.glob("#{FIGDIR}/*.pdf")
exist_figs += Dir.glob("#{FIGDIR}/*.eps")

used_figs = []
logs.each do |logname|
  File.open(logname, "r") do |f|
    f.readlines.each do |line|
      if line.match(/^File: (\S+) Graphic file \(type \w+\)/)
        used_figs << $1
      end
    end
  end
end

exist_figs = exist_figs.map {|fig| File.expand_path(fig) }.sort
used_figs = used_figs.map {|fig| File.expand_path(fig) }.sort

puts exist_figs - used_figs

This script shows the list of figure files that are not used during LaTeXing.