README

This script and build target will take the revision number from a Subversion repository (or a Git
repository using git-svn) and substitute the last dotted component of the CFBundleVersion in your
Info.plist file (you can put something like "1.0.0.xx" for your first run).

Instructions:

- Save update_build_number.rb into ${PROJECT_DIR}/Scripts (or wherever you want, but remember to
  change the paths accordigly in the build phase).
- Add a new target to your project (I named mines as "Update FooBar Build Number"). In new target
  dialog choose from "Other" category "Shell Script Target".
- In the "Run Script" build phase include the contents shown above.
- Make your main target depend on "Update FooBar Build Number".

gistfile2.sh

# Script to paste in the Run Script phase

update_build_number() {
	# This is where my git binaries are
	PATH=$PATH:/opt/local/bin

	/usr/bin/env ruby ${PROJECT_DIR}/Scripts/update_build_number.rb ${PROJECT_DIR} ${PROJECT_DIR}/Path/To/Your/Info.plist
}

case "$CONFIGURATION" in
	Beta|Distribution)
		update_build_number
		;;
	*)
esac

update_build_number.rb

require 'osx/cocoa'

class InvalidRepository < Exception; end

class GitInfo
  def initialize(path)
    unless File.exist?(File.join(path, '.git'))
      raise InvalidRepository.new(path)
    end
    @path = File.join(path, '.git')
  end
  
  def build_number
    result = `git --git-dir=#{@path} svn info`
    if $?.success?
      result = result.split("\n").inject({}) do |memo, item|
        pair = item.split(':', 2)
        memo[pair.first] = pair.last.strip
        memo
      end
      
      result = result["Revision"]
      return nil if result.nil?
      begin
        Integer(result)
      rescue ArgumentError => e
        result = result[0..-2]
        if result.length > 0
          retry
        else
          nil
        end
      end
    else
      nil
    end
  end
end

class SVNInfo
  def initialize(path)
    unless File.exist?(File.join(path, '.svn'))
      raise InvalidRepository.new(path)
    end
    @path = path
  end
  
  def build_number
    result = `svnversion #{@path}`
    if $?.success?
      result = result.split(':').last
      begin
        Integer(result)
      rescue ArgumentError => e
        result = result[0..-2]
        if result.length > 0
          retry
        else
          nil
        end
      end
    else
      nil
    end
  end
end

def main
  begin
    info = SVNInfo.new(ARGV[0])
  rescue InvalidRepository => e
    begin
      info = GitInfo.new(ARGV[0])
    rescue InvalidRepository => e
      return
    end
  end
  
  build_number = info.build_number
  
  plist = OSX::NSMutableDictionary.dictionaryWithContentsOfFile_(ARGV[1])
  main_version = plist['CFBundleVersion'].split('.')[0..-2]
  plist['CFBundleVersion'] = (main_version << build_number).join('.')
  plist.writeToFile_atomically_(ARGV[1], true)
end

if __FILE__ == $0
  main
end