40 lines
810 B
Ruby
40 lines
810 B
Ruby
# frozen_string_literal: true
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# Uniquify
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#
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# Return a version of the given 'base' string that is unique
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# by appending a counter to it. Uniqueness is determined by
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# repeated calls to the passed block.
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#
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# You can pass an initial value for the counter, if not given
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# counting starts from 1.
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#
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# If `base` is a function/proc, we expect that calling it with a
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# candidate counter returns a string to test/return.
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class Uniquify
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def initialize(counter = nil)
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@counter = counter
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end
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def string(base)
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@base = base
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increment_counter! while yield(base_string)
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base_string
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end
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private
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def base_string
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if @base.respond_to?(:call)
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@base.call(@counter)
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else
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"#{@base}#{@counter}"
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end
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end
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def increment_counter!
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@counter ||= 0
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@counter += 1
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end
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end
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