Commit b416290d authored by Barry Warsaw's avatar Barry Warsaw

Some rewriting of the "Internationalizing your programs and modules"

subsection to include a discussion of the msgfmt.py program.
parent 2fa699ec
......@@ -302,28 +302,49 @@ In this example, the string \code{'writing a log message'} is marked as
a candidate for translation, while the strings \code{'mylog.txt'} and
\code{'w'} are not.
The GNU \code{gettext} package provides a tool, called
\program{xgettext}, that scans C and \Cpp{} source code looking for these
specially marked strings. \program{xgettext} generates what are
called \file{.pot} files, essentially structured human readable files
which contain every marked string in the source code. These
\file{.pot} files are copied and handed over to human translators who write
language-specific versions for every supported natural language.
For I18N Python programs however, \program{xgettext} won't work; it
doesn't understand the myriad of string types support by Python. The
standard Python distribution provides a tool called
\program{pygettext} that does though (found in the \file{Tools/i18n/}
directory).\footnote{Fran\c cois Pinard has written a program called
The Python distribution comes with two tools which help you generate
the message catalogs once you've prepared your source code. These may
or may not be available from a binary distribution, but they can be
found in a source distribution, in the \file{Tools/i18n} directory.
The \program{pygettext}\footnote{Fran\c cois Pinard has
written a program called
\program{xpot} which does a similar job. It is available as part of
his \program{po-utils} package at
\url{http://www.iro.umontreal.ca/contrib/po-utils/HTML}.
} This is a command line script that
supports a similar interface as \program{xgettext}; see its
documentation for details. Once you've used \program{pygettext} to
create your \file{.pot} files, you can use the standard GNU
\program{gettext} tools to generate your machine-readable \file{.mo}
files, which are readable by the \class{GNUTranslations} class.
\url{http://www.iro.umontreal.ca/contrib/po-utils/HTML}.} program
scans all your Python source code looking for the strings you
previously marked as translatable. It is similar to the GNU
\program{gettext} program except that it understands all the
intricacies of Python source code, but knows nothing about C or C++
source code. You don't need GNU \code{gettext} unless you're also
going to be translating C code (e.g. C extension modules).
\program{pygettext} generates textual Uniforum-style human readable
message catalog \file{.pot} files, essentially structured human
readable files which contain every marked string in the source code,
along with a placeholder for the translation strings.
\program{pygettext} is a command line script that supports a similar
command line interface as \program{xgettext}; for details on its use,
run:
\begin{verbatim}
pygettext.py --help
\end{verbatim}
Copies of these \file{.pot} files are then handed over to the
individual human translators who write language-specific versions for
every supported natural language. They send you back the filled in
language-specific versions as a \file{.po} file. Using the
\program{msgfmt.py}\footnote{\program{msgfmt.py} is binary
compatible with GNU \program{msgfmt} except that it provides a
simpler, all-Python implementation. With this and
\program{pygettext.py}, you generally won't need to install the GNU
\program{gettext} package to internationalize your Python
applications.} program (in the \file{Tools/i18n} directory), you take the
\file{.po} files from your translators and generate the
machine-readable \file{.mo} binary catalog files. The \file{.mo}
files are what the \module{gettext} module uses for the actual
translation processing during run-time.
How you use the \module{gettext} module in your code depends on
whether you are internationalizing your entire application or a single
......
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