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<!-- This HTML file has been created by texi2html 1.54
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<TITLE>GNU gettext utilities - Introduction</TITLE>
<link href="gettext_2.html" rel=Next>
<link href="gettext_toc.html" rel=ToC>
</HEAD>
<BODY>
<p>Go to the first, previous, <A HREF="gettext_2.html">next</A>, <A HREF="gettext_12.html">last</A> section, <A HREF="gettext_toc.html">table of contents</A>.
<P><HR><P>
<H1><A NAME="SEC1" HREF="gettext_toc.html#TOC1">Introduction</A></H1>
<BLOCKQUOTE>
<P>
This manual is still in <EM>DRAFT</EM> state. Some sections are still
empty, or almost. We keep merging material from other sources
(essentially e-mail folders) while the proper integration of this
material is delayed.
</BLOCKQUOTE>
<P>
In this manual, we use <EM>he</EM> when speaking of the programmer or
maintainer, <EM>she</EM> when speaking of the translator, and <EM>they</EM>
when speaking of the installers or end users of the translated program.
This is only a convenience for clarifying the documentation. It is
<EM>absolutely</EM> not meant to imply that some roles are more appropriate
to males or females. Besides, as you might guess, GNU <CODE>gettext</CODE>
is meant to be useful for people using computers, whatever their sex,
race, religion or nationality!
</P>
<P>
This chapter explains the goals sought in the creation
of GNU <CODE>gettext</CODE> and the free Translation Project.
Then, it explains a few broad concepts around
Native Language Support, and positions message translation with regard
to other aspects of national and cultural variance, as they apply to
to programs. It also surveys those files used to convey the
translations. It explains how the various tools interact in the
initial generation of these files, and later, how the maintenance
cycle should usually operate.
</P>
<P>
Please send suggestions and corrections to:
</P>
<PRE>
Internet address:
bug-gnu-utils@prep.ai.mit.edu
</PRE>
<P>
Please include the manual's edition number and update date in your messages.
</P>
<H2><A NAME="SEC2" HREF="gettext_toc.html#TOC2">The Purpose of GNU <CODE>gettext</CODE></A></H2>
<P>
Usually, programs are written and documented in English, and use
English at execution time to interact with users. This is true
not only of GNU software, but also of a great deal of commercial
and free software. Using a common language is quite handy for
communication between developers, maintainers and users from all
countries. On the other hand, most people are less comfortable with
English than with their own native language, and would prefer to
use their mother tongue for day to day's work, as far as possible.
Many would simply <EM>love</EM> to see their computer screen showing
a lot less of English, and far more of their own language.
</P>
<P>
However, to many people, this dream might appear so far fetched that
they may believe it is not even worth spending time thinking about
it. They have no confidence at all that the dream might ever
become true. Yet some have not lost hope, and have organized themselves.
The Translation Project is a formalization of this hope into a
workable structure, which has a good chance to get all of us nearer
the achievement of a truly multi-lingual set of programs.
</P>
<P>
GNU <CODE>gettext</CODE> is an important step for the Translation Project,
as it is an asset on which we may build many other steps. This package
offers to programmers, translators and even users, a well integrated
set of tools and documentation. Specifically, the GNU <CODE>gettext</CODE>
utilities are a set of tools that provides a framework within which
other free packages may produce multi-lingual messages. These tools
include a set of conventions about how programs should be written to
support message catalogs, a directory and file naming organization for the
message catalogs themselves, a runtime library supporting the retrieval of
translated messages, and a few stand-alone programs to massage in various
ways the sets of translatable strings, or already translated strings.
A special mode for GNU Emacs also helps ease interested parties into
preparing these sets, or bringing them up to date.
</P>
<P>
GNU <CODE>gettext</CODE> is designed to minimize the impact of
internationalization on program sources, keeping this impact as small
and hardly noticeable as possible. Internationalization has better
chances of succeeding if it is very light weighted, or at least,
appear to be so, when looking at program sources.
</P>
<P>
The Translation Project also uses the GNU <CODE>gettext</CODE>
distribution as a vehicle for documenting its structure and methods.
This goes beyond the strict technicalities of documenting the GNU <CODE>gettext</CODE>
proper. By so doing, translators will find in a single place, as
far as possible, all they need to know for properly doing their
translating work. Also, this supplemental documentation might also
help programmers, and even curious users, in understanding how GNU
<CODE>gettext</CODE> is related to the remainder of the Translation
Project, and consequently, have a glimpse at the <EM>big picture</EM>.
</P>
<H2><A NAME="SEC3" HREF="gettext_toc.html#TOC3">I18n, L10n, and Such</A></H2>
<P>
Two long words appear all the time when we discuss support of native
language in programs, and these words have a precise meaning, worth
being explained here, once and for all in this document. The words are
<EM>internationalization</EM> and <EM>localization</EM>. Many people,
tired of writing these long words over and over again, took the
habit of writing <STRONG>i18n</STRONG> and <STRONG>l10n</STRONG> instead, quoting the first
and last letter of each word, and replacing the run of intermediate
letters by a number merely telling how many such letters there are.
But in this manual, in the sake of clarity, we will patiently write
the names in full, each time...
</P>
<P>
By <STRONG>internationalization</STRONG>, one refers to the operation by which a
program, or a set of programs turned into a package, is made aware of and
able to support multiple languages. This is a generalization process,
by which the programs are untied from calling only English strings or
other English specific habits, and connected to generic ways of doing
the same, instead. Program developers may use various techniques to
internationalize their programs. Some of these have been standardized.
GNU <CODE>gettext</CODE> offers one of these standards. See section <A HREF="gettext_8.html#SEC39">The Programmer's View</A>.
</P>
<P>
By <STRONG>localization</STRONG>, one means the operation by which, in a set
of programs already internationalized, one gives the program all
needed information so that it can adapt itself to handle its input
and output in a fashion which is correct for some native language and
cultural habits. This is a particularisation process, by which generic
methods already implemented in an internationalized program are used
in specific ways. The programming environment puts several functions
to the programmers disposal which allow this runtime configuration.
The formal description of specific set of cultural habits for some
country, together with all associated translations targeted to the
same native language, is called the <STRONG>locale</STRONG> for this language
or country. Users achieve localization of programs by setting proper
values to special environment variables, prior to executing those
programs, identifying which locale should be used.
</P>
<P>
In fact, locale message support is only one component of the cultural
data that makes up a particular locale. There are a whole host of
routines and functions provided to aid programmers in developing
internationalized software and which allow them to access the data
stored in a particular locale. When someone presently refers to a
particular locale, they are obviously referring to the data stored
within that particular locale. Similarly, if a programmer is referring
to "accessing the locale routines", they are referring to the
complete suite of routines that access all of the locale's information.
</P>
<P>
One uses the expression <STRONG>Native Language Support</STRONG>, or merely NLS,
for speaking of the overall activity or feature encompassing both
internationalization and localization, allowing for multi-lingual
interactions in a program. In a nutshell, one could say that
internationalization is the operation by which further localizations
are made possible.
</P>
<P>
Also, very roughly said, when it comes to multi-lingual messages,
internationalization is usually taken care of by programmers, and
localization is usually taken care of by translators.
</P>
<H2><A NAME="SEC4" HREF="gettext_toc.html#TOC4">Aspects in Native Language Support</A></H2>
<P>
For a totally multi-lingual distribution, there are many things to
translate beyond output messages.
</P>
<UL>
<LI>
As of today, GNU <CODE>gettext</CODE> offers a complete toolset for
translating messages output by C programs. Perl scripts and shell
scripts will also need to be translated. Even if there are today some hooks
by which this can be done, these hooks are not integrated as well as they
should be.
<LI>
Some programs, like <CODE>autoconf</CODE> or <CODE>bison</CODE>, are able
to produce other programs (or scripts). Even if the generating
programs themselves are internationalized, the generated programs they
produce may need internationalization on their own, and this indirect
internationalization could be automated right from the generating
program. In fact, quite usually, generating and generated programs
could be internationalized independently, as the effort needed is
fairly orthogonal.
<LI>
A few programs include textual tables which might need translation
themselves, independently of the strings contained in the program
itself. For example, RFC 1345 gives an English description for each
character which GNU <CODE>recode</CODE> is able to reconstruct at execution.
Since these descriptions are extracted from the RFC by mechanical means,
translating them properly would require a prior translation of the RFC
itself.
<LI>
Almost all programs accept options, which are often worded out so to
be descriptive for the English readers; one might want to consider
offering translated versions for program options as well.
<LI>
Many programs read, interpret, compile, or are somewhat driven by
input files which are texts containing keywords, identifiers, or
replies which are inherently translatable. For example, one may want
<CODE>gcc</CODE> to allow diacriticized characters in identifiers or use
translated keywords; <SAMP>`rm -i'</SAMP> might accept something else than
<SAMP>`y'</SAMP> or <SAMP>`n'</SAMP> for replies, etc. Even if the program will
eventually make most of its output in the foreign languages, one has
to decide whether the input syntax, option values, etc., are to be
localized or not.
<LI>
The manual accompanying a package, as well as all documentation files
in the distribution, could surely be translated, too. Translating a
manual, with the intent of later keeping up with updates, is a major
undertaking in itself, generally.
</UL>
<P>
As we already stressed, translation is only one aspect of locales.
Other internationalization aspects are not currently handled by GNU
<CODE>gettext</CODE>, but perhaps may be handled in future versions. There
are many attributes that are needed to define a country's cultural
conventions. These attributes include beside the country's native
language, the formatting of the date and time, the representation of
numbers, the symbols for currency, etc. These local <STRONG>rules</STRONG> are
termed the country's locale. The locale represents the knowledge
needed to support the country's native attributes.
</P>
<P>
There are a few major areas which may vary between countries and
hence, define what a locale must describe. The following list helps
putting multi-lingual messages into the proper context of other tasks
related to locales, and also presents some other areas which GNU
<CODE>gettext</CODE> might eventually tackle, maybe, one of these days.
</P>
<DL COMPACT>
<DT><EM>Characters and Codesets</EM>
<DD>
The codeset most commonly used through out the USA and most English
speaking parts of the world is the ASCII codeset. However, there are
many characters needed by various locales that are not found within
this codeset. The 8-bit ISO 8859-1 code set has most of the special
characters needed to handle the major European languages. However, in
many cases, the ISO 8859-1 font is not adequate. Hence each locale
will need to specify which codeset they need to use and will need
to have the appropriate character handling routines to cope with
the codeset.
<DT><EM>Currency</EM>
<DD>
The symbols used vary from country to country as does the position
used by the symbol. Software needs to be able to transparently
display currency figures in the native mode for each locale.
<DT><EM>Dates</EM>
<DD>
The format of date varies between locales. For example, Christmas day
in 1994 is written as 12/25/94 in the USA and as 25/12/94 in Australia.
Other countries might use ISO 8061 dates, etc.
Time of the day may be noted as <VAR>hh</VAR>:<VAR>mm</VAR>, <VAR>hh</VAR>.<VAR>mm</VAR>,
or otherwise. Some locales require time to be specified in 24-hour
mode rather than as AM or PM. Further, the nature and yearly extent
of the Daylight Saving correction vary widely between countries.
<DT><EM>Numbers</EM>
<DD>
Numbers can be represented differently in different locales.
For example, the following numbers are all written correctly for
their respective locales:
<PRE>
12,345.67 English
12.345,67 French
1,2345.67 Asia
</PRE>
Some programs could go further and use different unit systems, like
English units or Metric units, or even take into account variants
about how numbers are spelled in full.
<DT><EM>Messages</EM>
<DD>
The most obvious area is the language support within a locale. This is
where GNU <CODE>gettext</CODE> provides the means for developers and users to
easily change the language that the software uses to communicate to
the user.
</DL>
<P>
In the near future we see no chance that components of locale outside of
message handling will be made available for use in other
packages. The reason for this is that most modern systems provide
a more or less reasonable support for at least some of the missing
components. Another point is that the GNU <CODE>libc</CODE> and Linux will get
a new and complete implementation of the whole locale functionality
which could be adopted by system lacking a reasonable locale support.
</P>
<H2><A NAME="SEC5" HREF="gettext_toc.html#TOC5">Files Conveying Translations</A></H2>
<P>
The letters PO in <TT>`.po'</TT> files means Portable Object, to
distinguish it from <TT>`.mo'</TT> files, where MO stands for Machine
Object. This paradigm, as well as the PO file format, is inspired
by the NLS standard developed by Uniforum, and implemented by Sun
in their Solaris system.
</P>
<P>
PO files are meant to be read and edited by humans, and associate each
original, translatable string of a given package with its translation
in a particular target language. A single PO file is dedicated to
a single target language. If a package supports many languages,
there is one such PO file per language supported, and each package
has its own set of PO files. These PO files are best created by
the <CODE>xgettext</CODE> program, and later updated or refreshed through
the <CODE>msgmerge</CODE> program. Program <CODE>xgettext</CODE> extracts all
marked messages from a set of C files and initializes a PO file with
empty translations. Program <CODE>msgmerge</CODE> takes care of adjusting
PO files between releases of the corresponding sources, commenting
obsolete entries, initializing new ones, and updating all source
line references. Files ending with <TT>`.pot'</TT> are kind of base
translation files found in distributions, in PO file format, and
<TT>`.pox'</TT> files are often temporary PO files.
</P>
<P>
MO files are meant to be read by programs, and are binary in nature.
A few systems already offer tools for creating and handling MO files
as part of the Native Language Support coming with the system, but the
format of these MO files is often different from system to system,
and non-portable. They do not necessary use <TT>`.mo'</TT> for file
extensions, but since system libraries are also used for accessing
these files, it works as long as the system is self-consistent about
it. If GNU <CODE>gettext</CODE> is able to interface with the tools already
provided with systems, it will consequently let these provided tools
take care of generating the MO files. Or else, if such tools are not
found or do not seem usable, GNU <CODE>gettext</CODE> will use its own ways
and its own format for MO files. Files ending with <TT>`.gmo'</TT> are
really MO files, when it is known that these files use the GNU format.
</P>
<H2><A NAME="SEC6" HREF="gettext_toc.html#TOC6">Overview of GNU <CODE>gettext</CODE></A></H2>
<P>
The following diagram summarizes the relation between the files
handled by GNU <CODE>gettext</CODE> and the tools acting on these files.
It is followed by a somewhat detailed explanations, which you should
read while keeping an eye on the diagram. Having a clear understanding
of these interrelations would surely help programmers, translators
and maintainers.
</P>
<PRE>
Original C Sources ---&#62; PO mode ---&#62; Marked C Sources ---.
|
.---------&#60;--- GNU gettext Library |
.--- make &#60;---+ |
| `---------&#60;--------------------+-----------'
| |
| .-----&#60;--- PACKAGE.pot &#60;--- xgettext &#60;---' .---&#60;--- PO Compendium
| | | ^
| | `---. |
| `---. +---&#62; PO mode ---.
| +----&#62; msgmerge ------&#62; LANG.pox ---&#62;--------' |
| .---' |
| | |
| `-------------&#60;---------------. |
| +--- LANG.po &#60;--- New LANG.pox &#60;----'
| .--- LANG.gmo &#60;--- msgfmt &#60;---'
| |
| `---&#62; install ---&#62; /.../LANG/PACKAGE.mo ---.
| +---&#62; "Hello world!"
`-------&#62; install ---&#62; /.../bin/PROGRAM -------'
</PRE>
<P>
The indication <SAMP>`PO mode'</SAMP> appears in two places in this picture,
and you may safely read it as merely meaning "hand editing", using
any editor of your choice, really. However, for those of you being
the lucky users of GNU Emacs, PO mode has been specifically created
for providing a cozy environment for editing or modifying PO files.
While editing a PO file, PO mode allows for the easy browsing of
auxiliary and compendium PO files, as well as for following references into
the set of C program sources from which PO files have been derived.
It has a few special features, among which are the interactive marking
of program strings as translatable, and the validation of PO files
with easy repositioning to PO file lines showing errors.
</P>
<P>
As a programmer, the first step to bringing GNU <CODE>gettext</CODE>
into your package is identifying, right in the C sources, those strings
which are meant to be translatable, and those which are untranslatable.
This tedious job can be done a little more comfortably using emacs PO
mode, but you can use any means familiar to you for modifying your
C sources. Beside this some other simple, standard changes are needed to
properly initialize the translation library. See section <A HREF="gettext_3.html#SEC13">Preparing Program Sources</A>, for
more information about all this.
</P>
<P>
For newly written software the strings of course can and should be
marked while writing the it. The <CODE>gettext</CODE> approach makes this
very easy. Simply put the following lines at the beginning of each file
or in a central header file:
</P>
<PRE>
#define _(String) (String)
#define N_(String) (String)
#define textdomain(Domain)
#define bindtextdomain(Package, Directory)
</PRE>
<P>
Doing this allows you to prepare the sources for internationalization.
Later when you feel ready for the step to use the <CODE>gettext</CODE> library
simply remove these definitions, include <TT>`libintl.h'</TT> and link
against <TT>`libintl.a'</TT>. That is all you have to change.
</P>
<P>
Once the C sources have been modified, the <CODE>xgettext</CODE> program
is used to find and extract all translatable strings, and create an
initial PO file out of all these. This <TT>`<VAR>package</VAR>.pot'</TT> file
contains all original program strings. It has sets of pointers to
exactly where in C sources each string is used. All translations
are set to empty. The letter <KBD>t</KBD> in <TT>`.pot'</TT> marks this as
a Template PO file, not yet oriented towards any particular language.
See section <A HREF="gettext_4.html#SEC20">Invoking the <CODE>xgettext</CODE> Program</A>, for more details about how one calls the
<CODE>xgettext</CODE> program. If you are <EM>really</EM> lazy, you might
be interested at working a lot more right away, and preparing the
whole distribution setup (see section <A HREF="gettext_10.html#SEC67">The Maintainer's View</A>). By doing so, you
spare yourself typing the <CODE>xgettext</CODE> command, as <CODE>make</CODE>
should now generate the proper things automatically for you!
</P>
<P>
The first time through, there is no <TT>`<VAR>lang</VAR>.po'</TT> yet, so the
<CODE>msgmerge</CODE> step may be skipped and replaced by a mere copy of
<TT>`<VAR>package</VAR>.pot'</TT> to <TT>`<VAR>lang</VAR>.pox'</TT>, where <VAR>lang</VAR>
represents the target language.
</P>
<P>
Then comes the initial translation of messages. Translation in
itself is a whole matter, still exclusively meant for humans,
and whose complexity far overwhelms the level of this manual.
Nevertheless, a few hints are given in some other chapter of this
manual (see section <A HREF="gettext_9.html#SEC56">The Translator's View</A>). You will also find there indications
about how to contact translating teams, or becoming part of them,
for sharing your translating concerns with others who target the same
native language.
</P>
<P>
While adding the translated messages into the <TT>`<VAR>lang</VAR>.pox'</TT>
PO file, if you do not have GNU Emacs handy, you are on your own
for ensuring that your efforts fully respect the PO file format, and quoting
conventions (see section <A HREF="gettext_2.html#SEC9">The Format of PO Files</A>). This is surely not an impossible task,
as this is the way many people have handled PO files already for Uniforum or
Solaris. On the other hand, by using PO mode in GNU Emacs, most details
of PO file format are taken care of for you, but you have to acquire
some familiarity with PO mode itself. Besides main PO mode commands
(see section <A HREF="gettext_2.html#SEC10">Main PO mode Commands</A>), you should know how to move between entries
(see section <A HREF="gettext_2.html#SEC11">Entry Positioning</A>), and how to handle untranslated entries
(see section <A HREF="gettext_5.html#SEC27">Untranslated Entries</A>).
</P>
<P>
If some common translations have already been saved into a compendium
PO file, translators may use PO mode for initializing untranslated
entries from the compendium, and also save selected translations into
the compendium, updating it (see section <A HREF="gettext_4.html#SEC22">Using Translation Compendiums</A>). Compendium files
are meant to be exchanged between members of a given translation team.
</P>
<P>
Programs, or packages of programs, are dynamic in nature: users write
bug reports and suggestion for improvements, maintainers react by
modifying programs in various ways. The fact that a package has
already been internationalized should not make maintainers shy
of adding new strings, or modifying strings already translated.
They just do their job the best they can. For the Translation
Project to work smoothly, it is important that maintainers do not
carry translation concerns on their already loaded shoulders, and that
translators be kept as free as possible of programmatic concerns.
</P>
<P>
The only concern maintainers should have is carefully marking new
strings as translatable, when they should be, and do not otherwise
worry about them being translated, as this will come in proper time.
Consequently, when programs and their strings are adjusted in various
ways by maintainers, and for matters usually unrelated to translation,
<CODE>xgettext</CODE> would construct <TT>`<VAR>package</VAR>.pot'</TT> files which are
evolving over time, so the translations carried by <TT>`<VAR>lang</VAR>.po'</TT>
are slowly fading out of date.
</P>
<P>
It is important for translators (and even maintainers) to understand
that package translation is a continuous process in the lifetime of a
package, and not something which is done once and for all at the start.
After an initial burst of translation activity for a given package,
interventions are needed once in a while, because here and there,
translated entries become obsolete, and new untranslated entries
appear, needing translation.
</P>
<P>
The <CODE>msgmerge</CODE> program has the purpose of refreshing an already
existing <TT>`<VAR>lang</VAR>.po'</TT> file, by comparing it with a newer
<TT>`<VAR>package</VAR>.pot'</TT> template file, extracted by <CODE>xgettext</CODE>
out of recent C sources. The refreshing operation adjusts all
references to C source locations for strings, since these strings
move as programs are modified. Also, <CODE>msgmerge</CODE> comments out as
obsolete, in <TT>`<VAR>lang</VAR>.pox'</TT>, those already translated entries
which are no longer used in the program sources (see section <A HREF="gettext_5.html#SEC28">Obsolete Entries</A>). It finally discovers new strings and inserts them in
the resulting PO file as untranslated entries (see section <A HREF="gettext_5.html#SEC27">Untranslated Entries</A>). See section <A HREF="gettext_5.html#SEC24">Invoking the <CODE>msgmerge</CODE> Program</A>, for more information about what
<CODE>msgmerge</CODE> really does.
</P>
<P>
Whatever route or means taken, the goal is to obtain an updated
<TT>`<VAR>lang</VAR>.pox'</TT> file offering translations for all strings.
When this is properly achieved, this file <TT>`<VAR>lang</VAR>.pox'</TT> may
take the place of the previous official <TT>`<VAR>lang</VAR>.po'</TT> file.
</P>
<P>
The temporal mobility, or fluidity of PO files, is an integral part of
the translation game, and should be well understood, and accepted.
People resisting it will have a hard time participating in the
Translation Project, or will give a hard time to other participants! In
particular, maintainers should relax and include all available official
PO files in their distributions, even if these have not recently been
updated, without banging or otherwise trying to exert pressure on the
translator teams to get the job done. The pressure should rather come
from the community of users speaking a particular language, and
maintainers should consider themselves fairly relieved of any concern
about the adequacy of translation files. On the other hand, translators
should reasonably try updating the PO files they are responsible for,
while the package is undergoing pretest, prior to an official
distribution.
</P>
<P>
Once the PO file is complete and dependable, the <CODE>msgfmt</CODE> program
is used for turning the PO file into a machine-oriented format, which
may yield efficient retrieval of translations by the programs of the
package, whenever needed at runtime (see section <A HREF="gettext_6.html#SEC34">The Format of GNU MO Files</A>). See section <A HREF="gettext_6.html#SEC33">Invoking the <CODE>msgfmt</CODE> Program</A>, for more information about all modalities of execution
for the <CODE>msgfmt</CODE> program.
</P>
<P>
Finally, the modified and marked C sources are compiled and linked
with the GNU <CODE>gettext</CODE> library, usually through the operation of
<CODE>make</CODE>, given a suitable <TT>`Makefile'</TT> exists for the project,
and the resulting executable is installed somewhere users will find it.
The MO files themselves should also be properly installed. Given the
appropriate environment variables are set (see section <A HREF="gettext_7.html#SEC38">Magic for End Users</A>), the
program should localize itself automatically, whenever it executes.
</P>
<P>
The remainder of this manual has the purpose of explaining in depth the various
steps outlined above.
</P>
<P><HR><P>
<p>Go to the first, previous, <A HREF="gettext_2.html">next</A>, <A HREF="gettext_12.html">last</A> section, <A HREF="gettext_toc.html">table of contents</A>.
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