Use string difference in watch
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@ -1,36 +1,30 @@
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class Pry
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class Command::WatchExpression
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class Expression
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NODUP = [TrueClass, FalseClass, NilClass, Numeric, Symbol].freeze
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attr_reader :target, :source, :value, :previous_value
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def initialize(target, source)
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@target = target
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@source = source
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@source = Code.new(source).strip
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end
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def eval!
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@previous_value = value
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@value = target_eval(target, source)
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@value = @value.dup unless NODUP.any? { |klass| klass === @value }
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@previous_value = @value
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@value = Pry::ColorPrinter.pp(target_eval(target, source), "")
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end
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def to_s
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"#{print_source} => #{print_value}"
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"#{source} => #{value}"
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end
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# Has the value of the expression changed?
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#
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# We use the pretty-printed string represenation to detect differences
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# as this avoids problems with dup (causes too many differences) and == (causes too few)
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def changed?
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(value != previous_value)
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end
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def print_value
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Pry::ColorPrinter.pp(value, "")
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end
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def print_source
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Code.new(source).strip
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end
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private
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def target_eval(target, source)
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