- diff a b #!optional (reader read-line) (eq equal?) (optimal? #f)procedure
Utility to run lcs on text. a and b can be strings or ports, which are tokenized into a sequence by calling reader until eof-object is found. Returns a list of three values,the sequences read from a and b, and the lcs result. Unless optimal? is set, we trim common prefixes/suffixes before computing the lcs.