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title description date publishdate lastmod categories menu keywords signature workson hugoversion relatedfuncs deprecated aliases
errorf and warnf
Log ERROR or WARNING from the templates.
2017-09-30
2017-09-30
2017-09-30
functions
docs
parent
functions
strings
log
error
errorf FORMAT INPUT
printf
false
/functions/errorf

errorf or warnf will evaluate a format string, then output the result to the ERROR or WARNING log (and only once per error message to avoid flooding the log).

Any ERROR will also cause the build to fail (the hugo command will exit -1).

Both functions return an empty string, so the messages are only printed to the console.

{{ errorf "Failed to handle page %q" .Path }}
{{ warnf "You should update the shortcodes in %q" .Path }}

Note that errorf and warnf support all the formatting verbs of the fmt package.

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