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@@ -48,7 +48,9 @@ def state_of_joint(state, joint)
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   end
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 end
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-replay = STDIN.read
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+raise "usage #{$0} <path to replay file> [<player to show>]" unless ARGV[0]
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+replay = open(ARGV[0]).read
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+only_player = ARGV[1].chomp
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 @players = {}
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 replay.each_line do |line|
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@@ -56,12 +58,15 @@ replay.each_line do |line|
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   when /BOUT (\d+); (.+)$/
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     @players[$1.to_i] = $2
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   when /^FRAME (\d+)/:
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-    puts "Frame: #{$1.to_i}\n"
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-  when /^GRAB/
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+    puts "\nFrame: #{$1.to_i}\n"
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   when /^JOINT (0|1); (.*)$/
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-    puts "\tPlayer: #{@players[$1.to_i] || $1.to_i}"
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+    next if only_player && only_player != @players[$1.to_i]
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     $2.scan(/\d+\s+\d+/).map {|p| p.split(/\s+/)}.each do |(joint, state)|
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       puts "\t\t#{state_of_joint(state.to_i, joint.to_i)} #{@joint_list[joint.to_i]}\n"
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     end
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+  when /^GRIP (0|1); (0|1) (0|1)/:
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+    next if only_player && only_player != @players[$1.to_i]
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+    puts "\t\t#{@players[$1.to_i]} left grip" if ($2 == "1")
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+    puts "\t\t#{@players[$1.to_i]} right grip" if ($3 == "1")
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   end
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 end
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\ No newline at end of file