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31 lines
826 B
Markdown
31 lines
826 B
Markdown
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---
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title: fmt.Warnf
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linkTitle: warnf
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description: Log a WARNING from a template.
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categories: [functions]
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keywords: []
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menu:
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docs:
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parent: functions
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function:
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aliases: [warnf]
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returnType: string
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signatures: ['fmt.Warnf FORMAT [INPUT]']
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relatedFunctions:
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- fmt.Errorf
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- fmt.Erroridf
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- fmt.Warnf
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aliases: [/functions/warnf]
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---
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The documentation for [Go's fmt package] describes the structure and content of the format string.
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Like the [`printf`] function, the `warnf` function evaluates the format string. It then prints the result to the WARNING log. Hugo prints each unique message once to avoid flooding the log with duplicate warnings.
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```go-html-template
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{{ warnf "Copyright notice missing from site configuration" }}
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```
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[`printf`]: /functions/fmt/printf
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[Go's fmt package]: https://pkg.go.dev/fmt
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