diff --git a/app/models/repository/git.rb b/app/models/repository/git.rb
index c1f0020eb..f3ea8e003 100644
--- a/app/models/repository/git.rb
+++ b/app/models/repository/git.rb
@@ -38,6 +38,10 @@ class Repository::Git < Repository
     'Git'
   end
 
+  def commits(authors, start_date, end_date)
+    scm.commits(authors, start_date, end_date)
+  end
+
   def report_last_commit
     extra_report_last_commit
   end
diff --git a/lib/redmine/scm/adapters/git_adapter.rb b/lib/redmine/scm/adapters/git_adapter.rb
index 1876190d9..81c361f6e 100644
--- a/lib/redmine/scm/adapters/git_adapter.rb
+++ b/lib/redmine/scm/adapters/git_adapter.rb
@@ -380,6 +380,35 @@ module Redmine
           nil
         end
 
+        def parse_commit(commits)
+          sum = {file: 0, insertion: 0, deletion: 0}
+          commits.split("\n").each do |commit|
+            if /(\d+)\s+?file/ =~ commit
+              sum[:file] += $1 .to_i
+            end
+            if /(\d+)\s+?insertion/ =~ commit
+              sum[:insertion] += $1.to_i 
+            end
+            if /(\d+)\s+?deletion/ =~ commit
+              sum[:deletion] += $1.to_i
+            end
+          end
+          sum[:insertion] + sum[:deletion]
+        end
+
+        def commits(authors, start_date, end_date)
+          rs = []
+          authors.each do |author|
+            cmd_args = %W|log --pretty=tformat: --shortstat --author=#{author} --since=#{start_date} --until=#{end_date}|
+            commits = ''
+            git_cmd(cmd_args) do |io|
+              commits = io.read
+            end
+            rs << {author: author, num: parse_commit(commits)}
+          end
+          rs
+        end
+
         class Revision < Redmine::Scm::Adapters::Revision
           # Returns the readable identifier
           def format_identifier