Do not parse the entire git log to fetch new commits (takes several minutes for a few thousands commits), but only 1 week before the last known commit (#4547, #4716).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3394 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/scm/adapters/git_adapter.rb

@@ -110,11 +110,6 @@ module Redmine
           end
         end
 
-        def num_revisions
-          cmd = "#{GIT_BIN} --git-dir #{target('')} log --all --pretty=format:'' | wc -l"
-          shellout(cmd) {|io| io.gets.chomp.to_i + 1}
-        end
-
         def revisions(path, identifier_from, identifier_to, options={})
           revisions = Revisions.new
 
@@ -124,6 +119,7 @@ module Redmine
           cmd << " -n #{options[:limit]} " if options[:limit]
           cmd << " #{shell_quote(identifier_from + '..')} " if identifier_from
           cmd << " #{shell_quote identifier_to} " if identifier_to
+          cmd << " --since=#{shell_quote(options[:since].strftime("%Y-%m-%d %H:%M:%S"))}" if options[:since]
           cmd << " -- #{path}" if path && !path.empty?
 
           shellout(cmd) do |io|