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class Uniquify
# Return a version of the given 'base' string that is unique
# by appending a counter to it. Uniqueness is determined by
# repeated calls to `exists_fn`.
#
# If `base` is a function/proc, we expect that calling it with a
# candidate counter returns a string to test/return.
def string(base, exists_fn)
@counter = nil
if base.respond_to?(:call)
increment_counter! while exists_fn[base.call(@counter)]
base.call(@counter)
else
increment_counter! while exists_fn["#{base}#{@counter}"]
"#{base}#{@counter}"
end
end
private
def increment_counter!
@counter = @counter ? @counter.next : 1
end
end
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