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hugo/content/en/functions/errorf.md
Bjørn Erik Pedersen 4b670bc8cc Squashed 'docs/' changes from 16753a78d..341ecabb2 
341ecabb2 Update lookup-order.md
bfabd8ce8 Update homepage.md
7a1e0b742 Update shortcodes.md
e8bf22497 HTTPS links to Vimeo embeds
a9d0e7c68 Revise the wildly inaccurate types doc
af33bb724 netlify: Bump version
f4251583e Merge branch 'temp641'
4dcda861d releaser: Add release notes to /docs for release of 0.64.1
92bd0b1f5 Update errorf.md

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title description date publishdate lastmod categories menu keywords signature workson hugoversion relatedfuncs deprecated
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

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.