diff --git a/bin/git-timecost b/bin/git-timecost
index 26eeb28..12c879e 100755
--- a/bin/git-timecost
+++ b/bin/git-timecost
@@ -25,7 +25,7 @@ class GitExtractor
 		def initialize config, commit
 			@config = config
 			@time_stop = DateTime.parse(commit.date)
-			@time_start = @time_stop - (1.5 / 24.0)
+			@time_start = @time_stop - (@config[:range_granularity] * 3 / 24.0)
 			@commits = [commit]
 			self
 		end
@@ -101,7 +101,7 @@ class GitExtractor
 		end
 
 		def fixed_start 
-			return @time_start + (0.5/24.0)
+			return @time_start + (@config[:range_granularity]/24.0)
 		end
 
 		def diff 
@@ -181,6 +181,8 @@ class GitExtractor
 			:input_dump => [],
 			:output_dump => nil,
 
+			:range_granularity => 0.5, # in decimal hours
+
 			:verbose => false
 		}
 		@rangelist = nil
@@ -225,6 +227,13 @@ class GitExtractor
 				@config[:author_filter] = author
 				@config[:author_filter_enable] = true
 			end
+
+			# overlap : 
+			#
+			opts.on("-s","--scotch GRANULARITY", "Use GRANULARITY (decimal hours) to merge ranges") do |granularity|
+				puts "set scotch to #{granularity}"
+				@config[:range_granularity] = granularity.to_f
+			end
 		end
 		opts.parse! args
 
@@ -234,7 +243,10 @@ class GitExtractor
 	def analyze_git
 		# git log
 		# foreach, create time range (before) + logs
-		process = IO.popen ["git", "log", "--date=iso"]
+		process = IO.popen ["git", "log", 
+					  "--date=iso", 
+					  "--no-patch",
+					  "--","."]
 
 
 		@rangelist = RangeList.new
@@ -242,6 +254,8 @@ class GitExtractor
 		loop do
 			line = process.gets
 			break if line.nil?
+			# utf-8 fix ?
+			# line.encode!( line.encoding, "binary", :invalid => :replace, :undef => :replace)
 			line.strip!
 
 			case line
@@ -253,7 +267,7 @@ class GitExtractor
 					@rangelist.add range
 				end
 				commit = Commit.new id
-				#puts "commit #{id}"
+				# puts "commit #{id}"
 
 			when /^Author:\s*(.*?)\s*$/ then
 				unless commit.nil? then
@@ -289,8 +303,6 @@ class GitExtractor
 				end
 			end
 
-			def exec
-			end
 		end
 
 	end