diff --git a/bin/git-timecost b/bin/git-timecost
index 4acc0b2..1258eff 100755
--- a/bin/git-timecost
+++ b/bin/git-timecost
@@ -14,6 +14,8 @@ app.parse_cmdline ARGV
 app.analyze
 app.export
 app.report
+#app.report_ranges
+#app.report_users
 
 exit 0
 
diff --git a/lib/timecost/author_list.rb b/lib/timecost/author_list.rb
new file mode 100644
index 0000000..06ba002
--- /dev/null
+++ b/lib/timecost/author_list.rb
@@ -0,0 +1,24 @@
+
+module TimeCost
+	class AuthorList
+		# Prepare an empty index (local)
+		def initialize
+			@count = 0
+			@store = {}
+		end
+
+		# Return local user id for git user
+		# FIXME: should handle multiple names for same user
+		def parse gitauthor
+			invert_store = @store.invert
+			result = 0
+			if invert_store.include? gitauthor then
+				result = invert_store[gitauthor]
+			else
+				@store[gitauthor] = @count
+				result = @count
+				@count += 1
+			end
+		end
+	end
+end
diff --git a/lib/timecost/cli.rb b/lib/timecost/cli.rb
index b40d089..de2183b 100644
--- a/lib/timecost/cli.rb
+++ b/lib/timecost/cli.rb
@@ -17,6 +17,7 @@ module TimeCost
 				:verbose => false
 			}
 			@rangelist = nil
+			@authorlist = nil
 		end
 
 		def parse_cmdline args
diff --git a/lib/timecost/rangelist.rb b/lib/timecost/range_list.rb
similarity index 100%
rename from lib/timecost/rangelist.rb
rename to lib/timecost/range_list.rb
diff --git a/lib/timecost/user.rb b/lib/timecost/user.rb
deleted file mode 100644
index 8335fde..0000000
--- a/lib/timecost/user.rb
+++ /dev/null
@@ -1,8 +0,0 @@
-
-module TimeCost
-	class Range
-		# Return local user id for git user
-		def self.parse gituser
-		end
-	end
-end