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module FileService extend self
def unique_filename( path, enum_with: with_ints )
file_names = enum_with.map( &file_name_maker(path) )
file_names
.drop_while( &File.method(:exists?) )
.next
end
def with_ints(format='%d')
(0..Float::INFINITY)
.lazy
.map{ |n| format % n }
end
private
def file_name_maker path
->(n){ [path, n].join('_') }
end
end
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