snippet - svn_grep.rb

Rails and SVN aficionados:

My colleague wrote a lite Ruby wrapper on SVN --xml that helps those
of us getting on in years grep our log for some bygone code.

The result is completely brute force, and does not exclude log entries
that didn't change the grepped lines. This provides an added benefit -
you don't need to pipe | less to slow the output down!

The code also comes with a prototypical unit test illustrating
stubbing out the actual SVN call, and illustrating some of SVN's
sample XML output.

-- 
 Phlip
#!/usr/bin/env ruby
require 'optparse'
require 'rexml/document'
module SvnGrepModule
 class SvnGrepper
   def initialize(dir)
     @svn = dir
   end
   def find(regex)
     @found_revisions = []
     regex = /#{regex}/
     revisions.each do |revision|
       found = %x[svn cat -r#{revision} #{@svn}].grep(regex)
       if found.length > 0
         puts "#{revision}: #{found}"
         @found_revisions << revision
       end
     end
   end
   def revisions
     doc = xml('log --xml')
     log_entries = REXML::XPath.match(doc, '//logentry')
     return log_entries.collect{ |log| log.attributes['revision'] }
   end
   def xml(command)
     REXML::Document.new(%x[svn #{command} #{@svn}])
   end
   def current_revision
     doc = xml('info --xml')
     @current_revision = REXML::XPath.first(doc, '/info/entry/@revision').value
   end
 end
end
if ARGV.include?('test')
 require 'test/unit'
 require 'rubygems'
 require 'mocha'
 include SvnGrepModule
 class SvnGrepperTest < Test::Unit::TestCase
   def test_svn_grepper
     svn = SvnGrepper.new('/home/wrecker/projects/ibenwrkinondarailroad/config/environment.rb')
     svn.expects(:xml).returns REXML::Document.new("<?xml version='1.0'?>
       <info>
         <entry
             kind='file'
             revision='42'
             path='/home/wrecker/projects/ibenwrkinondarailroad/config/environment.rb'>
           <url>svn://repo/ibenwrkinondarailroad/config/environment.rb</url>
           <repository>
             <root>svn://repo</root>
             <uuid>6f9af763-49f8-0310-a517-bcf8306575d7</uuid>
           </repository>
           <wc-info>
             <schedule>normal</schedule>
             <text-updated>2007-07-19T17:54:02.000000Z</text-updated>
             <checksum>84ed977b7c0185aa70969675781e3d92</checksum>
           </wc-info>
           <commit revision='8902'>
             <author>wrecker</author>
             <date>2007-07-19T18:09:31.817664Z</date>
           </commit>
         </entry>
       </info>")
     assert_kind_of SvnGrepper, svn
     assert_equal '42', svn.current_revision
     svn.expects(:xml).returns REXML::Document.new('<?xml version="1.0"?>
       <log>
       <logentry
          revision="8902">
       <author>wrecker</author>
       <date>2007-07-20T18:09:31.817663Z</date>
       <msg>refactor thingy</msg>
       </logentry>
       <logentry
          revision="8786">
       <author>wrecker</author>
       <date>2007-09-20T16:17:07.292212Z</date>
       <msg>added test for daily_count</msg>
       </logentry>
       <logentry
          revision="8730">
       <author>wrecker</author>
       <date>2007-09-19T20:25:47.765465Z</date>
       <msg>refact-AAARRRR</msg>
       </logentry>
       <logentry
          revision="8711">
       <author>wrecker</author>
       <date>2007-07-11T15:08:20.585929Z</date>
       <msg>Adding yummy COUNTRY_HASH</msg>
       </logentry>')
     assert_equal 4, svn.revisions.length
     # svn.find('DEBUG_LOGGER')
   end
 end
else
 include SvnGrepModule
 svn_dir  = ARGV.shift
 look_for = ARGV.shift
 if File.directory?(svn_dir)
   # TODO if it is a directory, recursively look at the files
 else
   SvnGrepper.new(svn_dir).find(look_for)
 end
end
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