Is there any way to generate custom errors/warnings in LaTeX?

Question

I want something like \ifmmode\else\GenerateWarning{The command \backslash uzuka is supported only in math mode.}\fi, which is supposed to generate a warning "The command \uzuka is supported only in math mode.". Is there a command or a package with this capacibility?

score 41 · Accepted Answer · edited May 09 '22 at 08:28

41

For LaTeX, use the commands described in section 4.9 of clsguide.pdf:

\PackageWarning and \PackageWarningNoLine if you are writing a package
\ClassWarning and \ClassWarningNoLine if you are writing a class
The internal generic version for warnings is \GenericWarning

The expl3 bundle has another interface for warnings and similar messages, see Part III, chapter 11 in source3.pdf.

edited May 09 '22 at 08:28

codeMonkey

175

answered Sep 20 '10 at 11:02

Philipp

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I'd add that the expl3 approach has been designed to allow suppression of messages in a selective fashion. Packages such as silence can do the same for LaTeX2e messages but as an 'add on'. – Joseph Wright Sep 20 '10 at 11:43
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@doncherry Thanks, fixed. (It's called l3kernel now instead of expl3.) – Philipp Dec 09 '12 at 20:52
What was Part XVII is now Part XVIII Messaging (I presume). – stefanct Jul 03 '19 at 11:18
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For error instead of warning, use \PackageError – tobiasBora Jan 27 '22 at 17:22

Charles Stewart · Answer 2 · 2013-05-16T09:46:32.397

22

Just use the built-in \errmessage for errors, e.g. \let\GenerateWarning=\errmessage.

The kind of warnings Latex generates are just messages; \let\GenerateWarning=\message will not interrupt the compile. Latex uses the commands \@latex@warning and \@latex@warning@no@lines to create these for its own warnings: you check the source you find in latex.ltx.

edited May 16 '13 at 09:46

answered Sep 20 '10 at 10:08

Charles Stewart

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Yes, that will allow to generate errors. But what about warnings? Is it possible to generate them too? – fiktor Sep 20 '10 at 11:13
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Thanks to search using \errmessage keyword I've found in TeXBook how to output warning. Actually I've found, that my editor (TeXnicCenter 1.0) treats as warnings output lines like "LaTeX Warning: \uzuka used outside of math mode on input line 211", which can be generated using \message{LaTeX Warning: \noexpand\uzuka used outside of math mode on input line \the\inputlineno}. Thank you. – fiktor Sep 20 '10 at 11:21
Relevant: https://tex.stackexchange.com/q/115976/8666 – 0 _ Aug 21 '17 at 00:55
Is it possible to generate an expanded message as well? – Someone Nov 08 '20 at 21:47

score 17 · Answer 3 · answered Sep 20 '10 at 10:07

17

You can use \typeout{msg}. The command will print msg on the terminal and in the log file.

answered Sep 20 '10 at 10:07

yannisl

117,160

Is there any way to generate custom errors/warnings in LaTeX?

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