20 lines
506 B
Go
20 lines
506 B
Go
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package template
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import (
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"log"
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"sync"
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)
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// DeprecatedTemplateFunc wraps a template func to warn users that it's
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// deprecated. The deprecation warning is called only once.
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func DeprecatedTemplateFunc(funcName, useInstead string, deprecated func(string) string) func(string) string {
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once := sync.Once{}
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return func(in string) string {
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once.Do(func() {
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log.Printf("[WARN]: the `%s` template func is deprecated, please use %s instead",
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funcName, useInstead)
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})
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return deprecated(in)
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}
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}
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