#!/usr/bin/ruby
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#
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# Find unused resources in all the apps found recursively under the current directory
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# Usage:
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# find_unused_resources.rb [-html]
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#
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# If -html is specified, the output will be HTML, otherwise it will be plain text
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#
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# Author: cbeust@google.com
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require 'find'
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debug = false
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@@stringIdPattern = Regexp.new("name=\"([@_a-zA-Z0-9 ]*)\"")
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@@layoutIdPattern = Regexp.new("android:id=\".*id/([_a-zA-Z0-9]*)\"")
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@@stringXmlPatterns = [
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Regexp.new("@string/([_a-zA-Z0-9]*)"),
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Regexp.new("@array/([_a-zA-Z0-9]*)"),
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]
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@@javaIdPatterns = [
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Regexp.new("R.id.([_a-zA-Z0-9]+)"),
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Regexp.new("R.string.([_a-zA-Z0-9]+)"),
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Regexp.new("R.array.([_a-zA-Z0-9]+)"),
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Regexp.new("R.color.([_a-zA-Z0-9]+)"),
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Regexp.new("R.configVarying.([_a-zA-Z0-9]+)"),
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Regexp.new("R.dimen.([_a-zA-Z0-9]+)"),
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]
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@@appDir = "partner/google/apps/Gmail"
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def findResDirectories(root)
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result = Array.new
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Find.find(root) do |path|
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if FileTest.directory?(path)
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if File.basename(path) == "res"
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result << path
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else
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next
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end
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end
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end
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result
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end
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class UnusedResources
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attr_accessor :appDir, :unusedLayoutIds, :unusedStringIds
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end
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class FilePosition
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attr_accessor :file, :lineNumber
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def initialize(f, ln)
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@file = f
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@lineNumber = ln
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end
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def to_s
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"#{file}:#{lineNumber}"
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end
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def <=>(other)
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if @file == other.file
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@lineNumber - other.lineNumber
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else
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@file <=> other.file
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end
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end
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end
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def findAllOccurrences(re, string)
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result = Array.new
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s = string
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matchData = re.match(s)
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while (matchData)
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result << matchData[1].to_s
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s = s[matchData.end(1) .. -1]
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matchData = re.match(s)
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end
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result
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end
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@@globalJavaIdUses = Hash.new
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def recordJavaUses(glob)
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Dir.glob(glob).each { |filename|
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File.open(filename) { |file|
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file.each { |line|
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@@javaIdPatterns.each { |re|
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findAllOccurrences(re, line).each { |id|
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@@globalJavaIdUses[id] = FilePosition.new(filename, file.lineno)
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}
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}
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}
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}
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}
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end
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def findUnusedResources(dir)
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javaIdUses = Hash.new
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layouts = Hash.new
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strings = Hash.new
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xmlIdUses = Hash.new
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Dir.glob("#{dir}/res/**/*.xml").each { |filename|
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if ! (filename =~ /attrs.xml$/)
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File.open(filename) { |file|
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file.each { |line|
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findAllOccurrences(@@stringIdPattern, line).each {|id|
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strings[id] = FilePosition.new(filename, file.lineno)
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}
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findAllOccurrences(@@layoutIdPattern, line).each {|id|
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layouts[id] = FilePosition.new(filename, file.lineno)
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}
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@@stringXmlPatterns.each { |re|
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findAllOccurrences(re, line).each {|id|
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xmlIdUses[id] = FilePosition.new(filename, file.lineno)
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}
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}
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}
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}
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end
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}
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Dir.glob("#{dir}/AndroidManifest.xml").each { |filename|
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File.open(filename) { |file|
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file.each { |line|
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@@stringXmlPatterns.each { |re|
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findAllOccurrences(re, line).each {|id|
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xmlIdUses[id] = FilePosition.new(filename, file.lineno)
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}
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}
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}
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}
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}
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recordJavaUses("#{dir}/src/**/*.java")
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@@globalJavaIdUses.each_pair { |id, file|
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layouts.delete(id)
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strings.delete(id)
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}
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javaIdUses.each_pair { |id, file|
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layouts.delete(id)
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strings.delete(id)
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}
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xmlIdUses.each_pair { |id, file|
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layouts.delete(id)
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strings.delete(id)
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}
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result = UnusedResources.new
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result.appDir = dir
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result.unusedLayoutIds = layouts
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result.unusedStringIds = strings
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result
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end
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def findApps(dir)
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result = Array.new
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Dir.glob("#{dir}/**/res").each { |filename|
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a = filename.split("/")
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result << a.slice(0, a.size-1).join("/")
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}
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result
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end
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def displayText(result)
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result.each { |unusedResources|
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puts "=== #{unusedResources.appDir}"
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puts "----- Unused layout ids"
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unusedResources.unusedLayoutIds.sort { |id, file| id[1] <=> file[1] }.each {|f|
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puts " #{f[0]} #{f[1]}"
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}
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puts "----- Unused string ids"
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unusedResources.unusedStringIds.sort { |id, file| id[1] <=> file[1] }.each {|f|
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puts " #{f[0]} #{f[1]}"
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}
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}
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end
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def displayHtmlUnused(unusedResourceIds, title)
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puts "<h3>#{title}</h3>"
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puts "<table border='1'>"
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unusedResourceIds.sort { |id, file| id[1] <=> file[1] }.each {|f|
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puts "<tr><td><b>#{f[0]}</b></td> <td>#{f[1]}</td></tr>"
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}
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puts "</table>"
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end
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def displayHtml(result)
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title = "Unused resources as of #{Time.now.localtime}"
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puts "<html><header><title>#{title}</title></header><body>"
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puts "<h1><p align=\"center\">#{title}</p></h1>"
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result.each { |unusedResources|
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puts "<h2>#{unusedResources.appDir}</h2>"
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displayHtmlUnused(unusedResources.unusedLayoutIds, "Unused layout ids")
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displayHtmlUnused(unusedResources.unusedStringIds, "Unused other ids")
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}
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puts "</body>"
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end
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result = Array.new
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recordJavaUses("java/android/**/*.java")
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if debug
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result << findUnusedResources("apps/Browser")
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else
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findApps(".").each { |appDir|
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result << findUnusedResources(appDir)
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}
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end
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if ARGV[0] == "-html"
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displayHtml result
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else
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displayText result
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end
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