Hyphenation for words with underscore

Question

Can I tell LaTeX that it may hyphen words that contain an underscore _ always before the underscore?

I have a lot of code examples in text, like is_error_condition_enum and I would like to tell LaTeX it may hyphen this as:

Lorem ipsum is_error_-
condition_enum lorem.

always.

If that is not possible globally, how do I make an entry for some underscore-words like:

hyphenation{is_-error_-condition_-enum}

because that entry is rejected, obviously.

In sourcecode I write words like these as gpmono{isgpus{}errorgpus{}conditiongpus{}enum}.

egreg · Accepted Answer

newcommand{gpus}{_discretionary{-}{}{}}

If gpus is used in other places where hyphenation is not wanted, you can modify its definition only in the argument of gpmono:

newcommand{gpmono}[1]{begingroup
   renewcommand{gpus}{_discretionary{-}{}{}}%
   ttfamily#1endgroup}

Of course, without knowing your original definitions of gpmono and gpus, I tried to guess.

diabonas · Answer

The underscore package provides a way to do this automatically: It modifies the defintion of the _ command in order to allow hyphenation after the underscore. Furthermore, it allows you to simply write _ instead of _ in text mode to produce an underscore. Everything you have to do is loading the package with

usepackage{underscore}

tropappar · Answer

The package hyphenat enables hyphenation in words that contain underscores.
For example, the following TeX:
documentclass{article}
usepackage{hyphenat}
begin{document}
Lorem_ipsum_dolor_sit_amet,_consetetur_sadipscing_elitr,_sed_diam_nonumy_eirmod_tempor_invidunt_ut_labore_et_dolore_magna_aliquyam_erat,_sed_diam_voluptua._At_vero_eos_et_accusam_et_justo_duo_dolores_et_ea_rebum._Stet_clita_kasd_gubergren,_no_sea_takimata_sanctus_est_Lorem_ipsum_dolor_sit_amet._Lorem_ipsum_dolor_sit_amet,_consetetur_sadipscing_elitr,_sed_diam_nonumy_eirmod_tempor_invidunt_ut_labore_et_dolore_magna_aliquyam_erat,_sed_diam_voluptua._At_vero_eos_et_accusam_et_justo_duo_dolores_et_ea_rebum._Stet_clita_kasd_gubergren,_no_sea_takimata_sanctus_est_Lorem_ipsum_dolor_sit_amet.
end{document}

produces this output:

As you can see, it does both hyphenation after underscores and within words.

Hyphenation for words with underscore

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