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POLocalization in Perl using gettext and Locale::TextDomain, with fallback if Locale::TextDomain is not available
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  1. POLocalization in Perl using gettext and Locale::TextDomain, with fallback if Locale::TextDomain is not available
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    copied!<p>The "<a href="http://rassie.org/archives/247" rel="noreferrer" title="Rassie’s Doghouse » On the state of i18n in Perl">On the state of i18n in Perl</a>" blog post from 26 April 2009 recommends using <a href="http://p3rl.org/Locale::TextDomain" rel="noreferrer">Locale::TextDomain</a> module from libintl-perl distribution for l10n / i18n in Perl. Besides I have to use gettext anyway, and gettext support in Locale::Messages / Locale::TextDomain is more natural than in gettext emulation in <a href="http://p3rl.org/Locale::Maketext" rel="noreferrer">Locale::Maketext</a>.</p> <p>The subsection "<a href="http://www.gnu.org/software/gettext/manual/gettext.html#Perl" rel="noreferrer">15.5.18 Perl</a>" in chapter "<a href="http://www.gnu.org/software/gettext/manual/gettext.html#Programming-Languages" rel="noreferrer">15 Other Programming Languages</a>" in GNU gettext manual says:</p> <blockquote> <p><dl><dt><b>Portability</b></dt><br /> <dd>The <code>libintl-perl</code> package is platform independent but is not part of the Perl core. The programmer is responsible for providing a dummy implementation of the required functions if the package is not installed on the target system.</dd></dl><br /></p> </blockquote> <p>However neither of two examples in <a href="http://git.savannah.gnu.org/cgit/gettext.git/tree/gettext-tools/examples/hello-perl/" rel="noreferrer"><code>examples/hello-perl</code></a> in gettext sources (one using lower level Locale::Messages, one using higher level Locale::TextDomain) includes <strong>detecting</strong> if the package is installed on the target system, and providing <strong>dummy implementation</strong> if it is not.</p> <p>What is complicating matter (with respect to detecting if package is installed or not) is the following fragment of Locale::TextDomain manpage:</p> <blockquote> <p><strong>SYNOPSIS</strong></p> <pre><code>use Locale::TextDomain ('my-package', @locale_dirs); use Locale::TextDomain qw (my-package); </code></pre> <p><strong>USAGE</strong></p> <p>It is crucial to remember that you use Locale::TextDomain(3) as specified in the section "SYNOPSIS", that means you have to <strong>use</strong> it, not <strong>require</strong> it. The module behaves quite differently compared to other modules.</p> </blockquote> <p>Could you please tell me how one should detect if libintl-perl is present on target system, and how to provide dummy fallthrough implementation if it is not installed? Or give examples of programs / modules which do this?</p>
 

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