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> How would the guile version have looked if the following procedures where > available in some library? BTW, I agree that stuff like this should exist > somewhere in the guile tree. A library could have eliminated about a page, but not so much. > (define (find-files dir . arg-ls) > "Return a list of files within directory DIR. Two optional arguements > are supported, PREDICATE and RECURSE?. PREDICATE should be a procedure > of one argument that determines whether a particular file should be included > in the returned list. As a special case, if PREDICATE is a string, it is > compiled into a regular expression, and a predicate is generated that applies > this regular expression to the filename. RECURSE? determines whether the > procedure descends into subdirectories, and it defaults to #t. Symbolic > links are not followed." I like the bit about how a string supplied as a predicate automatically turns into a regexp. That might be a good convention to use more widely, whenever one supplies a predicate on strings. If the context says the predicate will be applied to filenames, it should be a glob pattern. If the context just says it'll be applied to strings, it should be a full regexp.