Simple script converting git patch file into tortoise merge compatible format. Usage: gitp2svnp.rb <git_patch_file>

gitp2svnp.rb

#!/usr/bin/ruby

if ARGV.length != 1
   puts "usage: git2svn <file_name>"
   puts "   file_name - git patch file name"
   exit
end

separator = "\n===================================================================\n"
new_file = false
content = ''
git_patch = ARGV[0]

File.open(git_patch, 'r') do |file|
   lines = file.readlines
   lines.each do |line|

      # Delete the additional "function/class defination info" from the hunk header line by simply replace the line with the second "@@" and anything before it.
      # So it will not be compatible with 3-way (or more-way) diff.
      # Question: considering the two-way diff, is this code safe?
      if line =~ /@@.*@@.*/
         line.gsub!(/(@@.*@@).*/, '\1')
      end

      line.gsub!(/^--- a\/(.*)/, 'Index: \1' + separator + '--- \1')
      if line =~ /^--- \/.*/
         new_file = true
         line.gsub!(/.*/,'')
      end
      if line =~ /^\+\+\+ b\/(.*)/
         line.gsub!(/^\+\+\+ b\/(.*)/, '+++ \1')
         if new_file == true
            new_file = false
            line.gsub!(/^\+\+\+ (.*)/,'Index: \1' + separator + '--- \1' + "\n" + '+++ \1')
         end
      end
      content += line
   end
end

svn_patch = git_patch.dup
if svn_patch =~ /\.patch$/
   index = svn_patch.rindex('.patch')
   svn_patch = svn_patch.insert(index, '.svn')
else
   svn_patch += '.svn.patch'
end

File.open(svn_patch, 'w') { |f| f.write(content) }