scan unused images and globals in a xcode project

scan_unused_files.rb

#!/usr/bin/env ruby

#TODO
# find all files not in project file
# =>  list these files

globalsfile = "Classes/Globals.h"
allfiles = `git ls-files`.split(/\n/)
#allfiles.each{|f| f.gsub!(/\"/, "")} #not needed when files have no unicode chars inf filenames

sourcefileextensions = "\.(m|h)$"
allsourcefileextensions = "\.(m|h|xib|html|css|js)$"
projectfilesextensions = "\.(xib)$"
resourcefilesextensions = "\.(png|gif|jpg)$"

sourcefiles = allfiles.grep /#{allsourcefileextensions}/
projectfiles = allfiles.grep /#{projectfilesextensions}/
resourcefiles = allfiles.grep /#{resourcefilesextensions}/



def check_file( file, string )
  File.open( file ) do |io|
    io.each {|line| line.chomp! ; return true if line.include? string}
  end
  nil
end

#find all resourefiles that are in no source file or nib file
# => they are not used anymore, even if they are in projectfiles
# this doesnt work if the image filesnames are generated
danglingresources = resourcefiles.find_all do |rf|
  sourcefiles.find {|sf| check_file(sf, File.basename(rf))}.nil?
end
danglingresources.each {|f| File.delete(f)}




def scan_globals(globalsfile)
  reg = /#define (\w+)/
  globals = []
  File.open( globalsfile ) do |io|
    io.each do |line| 
      line.chomp!
      m = reg.match(line)
      globals << m[1] unless m.nil?
    end
  end
  globals
end

sourcefiles_without_globals = sourcefiles.delete(globalsfile)
dangling_globals = scan_globals(globalsfile).find_all do |s|
  sourcefiles.find {|sf| check_file(sf, s)}.nil?
end


def delete_all_lines_with_dangling_globals(globalsfile, dangling_globals)
  file_content = ""
  File.open( globalsfile ) do |io|
    io.each { |line| file_content += line }
  end
  dangling_globals.each do |glob|
    out = ""
    file_content.lines.each do |line|
      out  += line unless line =~ / #{glob} /
    end
    file_content = out
  end
  file_content
end

out = File.open("Globals_new.h","w")
out.puts delete_all_lines_with_dangling_globals(globalsfile, dangling_globals)
out.close