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31 lines
802 B
Go
31 lines
802 B
Go
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package progress
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// A Printer can can return a new counter or print messages
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// at different log levels.
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// It must be safe to call its methods from concurrent goroutines.
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type Printer interface {
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NewCounter(description string) *Counter
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E(msg string, args ...interface{})
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P(msg string, args ...interface{})
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V(msg string, args ...interface{})
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VV(msg string, args ...interface{})
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}
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// NoopPrinter discards all messages
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type NoopPrinter struct{}
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var _ Printer = (*NoopPrinter)(nil)
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func (*NoopPrinter) NewCounter(description string) *Counter {
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return nil
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}
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func (*NoopPrinter) E(msg string, args ...interface{}) {}
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func (*NoopPrinter) P(msg string, args ...interface{}) {}
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func (*NoopPrinter) V(msg string, args ...interface{}) {}
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func (*NoopPrinter) VV(msg string, args ...interface{}) {}
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