/srv/cliopatria/cpack/swish/lib/swish/gitty.pl
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 data_diff(+Data1, +Data2, -UDiff) is det
Diff two data strings line-by-line. UDiff is a list of terms of the form below, where L1 and L2 provide the starting line in Data1 and Data2 and S1 and S2 provide the number of affected lines. 
udiff(L1,S1,L2,S2,Diff)

Diff is a list holding

+ Line
Line was added to Data1 to get Data2
- Line
Line was deleted from Data1 to get Data2
Line1 - Line2
Line was replaced
=(Line)
Line is identical (context line).
ClioPatria (version V3.1.1-51-ga0b30a5)