hugo/docs/content/en/functions/fmt/Warnf.md

title	description	categories	keywords	action	aliases
fmt.Warnf	Log a WARNING from a template.			aliases related returnType signatures warnf functions/fmt/Errorf functions/fmt/Erroridf string fmt.Warnf FORMAT [INPUT]	/functions/warnf

{{% include "functions/fmt/_common/fmt-layout.md" %}}

The warnf function evaluates the format string, then prints the result to the WARNING log. Hugo prints each unique message once to avoid flooding the log with duplicate warnings.

{{ warnf "The %q shortcode was unable to find %s. See %s" .Name $file .Position }}

To prevent suppression of duplicate messages when using warnf for debugging, make each message unique with the math.Counter function. For example:

{{ range site.RegularPages }}
  {{ .Section | warnf "%#[2]v [%[1]d]" math.Counter }}
{{ end }}