This is Info file gettext.info, produced by Makeinfo version 1.68 from the input file gettext.texi. INFO-DIR-SECTION GNU Gettext Utilities START-INFO-DIR-ENTRY * Gettext: (gettext). GNU gettext utilities. * gettextize: (gettext)gettextize Invocation. Prepare a package for gettext. * msgfmt: (gettext)msgfmt Invocation. Make MO files out of PO files. * msgmerge: (gettext)msgmerge Invocation. Update two PO files into one. * xgettext: (gettext)xgettext Invocation. Extract strings into a PO file. END-INFO-DIR-ENTRY This file provides documentation for GNU `gettext' utilities. It also serves as a reference for the free Translation Project. Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc. Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Permission is granted to copy and distribute translations of this manual into another language, under the above conditions for modified versions, except that this permission notice may be stated in a translation approved by the Foundation.  File: gettext.info, Node: Entry Positioning, Next: Normalizing, Prev: Main PO Commands, Up: Basics Entry Positioning ================= The cursor in a PO file window is almost always part of an entry. The only exceptions are the special case when the cursor is after the last entry in the file, or when the PO file is empty. The entry where the cursor is found to be is said to be the current entry. Many PO mode commands operate on the current entry, so moving the cursor does more than allowing the translator to browse the PO file, this also selects on which entry commands operate. Some PO mode commands alter the position of the cursor in a specialized way. A few of those special purpose positioning are described here, the others are described in following sections. `.' Redisplay the current entry. `n' `n' Select the entry after the current one. `p' `p' Select the entry before the current one. `<' Select the first entry in the PO file. `>' Select the last entry in the PO file. `m' Record the location of the current entry for later use. `l' Return to a previously saved entry location. `x' Exchange the current entry location with the previously saved one. Any GNU Emacs command able to reposition the cursor may be used to select the current entry in PO mode, including commands which move by characters, lines, paragraphs, screens or pages, and search commands. However, there is a kind of standard way to display the current entry in PO mode, which usual GNU Emacs commands moving the cursor do not especially try to enforce. The command `.' (`po-current-entry') has the sole purpose of redisplaying the current entry properly, after the current entry has been changed by means external to PO mode, or the Emacs screen otherwise altered. It is yet to be decided if PO mode helps the translator, or otherwise irritates her, by forcing a rigid window disposition while she is doing her work. We originally had quite precise ideas about how windows should behave, but on the other hand, anyone used to GNU Emacs is often happy to keep full control. Maybe a fixed window disposition might be offered as a PO mode option that the translator might activate or deactivate at will, so it could be offered on an experimental basis. If nobody feels a real need for using it, or a compulsion for writing it, we should drop this whole idea. The incentive for doing it should come from translators rather than programmers, as opinions from an experienced translator are surely more worth to me than opinions from programmers *thinking* about how *others* should do translation. The commands `n' (`po-next-entry') and `p' (`po-previous-entry') move the cursor the entry following, or preceding, the current one. If `n' is given while the cursor is on the last entry of the PO file, or if `p' is given while the cursor is on the first entry, no move is done. The commands `<' (`po-first-entry') and `>' (`po-last-entry') move the cursor to the first entry, or last entry, of the PO file. When the cursor is located past the last entry in a PO file, most PO mode commands will return an error saying `After last entry'. Moreover, the commands `<' and `>' have the special property of being able to work even when the cursor is not into some PO file entry, and one may use them for nicely correcting this situation. But even these commands will fail on a truly empty PO file. There are development plans for the PO mode for it to interactively fill an empty PO file from sources. *Note Marking::. The translator may decide, before working at the translation of a particular entry, that she needs to browse the remainder of the PO file, maybe for finding the terminology or phraseology used in related entries. She can of course use the standard Emacs idioms for saving the current cursor location in some register, and use that register for getting back, or else, use the location ring. PO mode offers another approach, by which cursor locations may be saved onto a special stack. The command `m' (`po-push-location') merely adds the location of current entry to the stack, pushing the already saved locations under the new one. The command `r' (`po-pop-location') consumes the top stack element and reposition the cursor to the entry associated with that top element. This position is then lost, for the next `r' will move the cursor to the previously saved location, and so on until no locations remain on the stack. If the translator wants the position to be kept on the location stack, maybe for taking a look at the entry associated with the top element, then go elsewhere with the intent of getting back later, she ought to use `m' immediately after `r'. The command `x' (`po-exchange-location') simultaneously reposition the cursor to the entry associated with the top element of the stack of saved locations, and replace that top element with the location of the current entry before the move. Consequently, repeating the `x' command toggles alternatively between two entries. For achieving this, the translator will position the cursor on the first entry, use `m', then position to the second entry, and merely use `x' for making the switch.  File: gettext.info, Node: Normalizing, Prev: Entry Positioning, Up: Basics Normalizing Strings in Entries ============================== There are many different ways for encoding a particular string into a PO file entry, because there are so many different ways to split and quote multi-line strings, and even, to represent special characters by backslahsed escaped sequences. Some features of PO mode rely on the ability for PO mode to scan an already existing PO file for a particular string encoded into the `msgid' field of some entry. Even if PO mode has internally all the built-in machinery for implementing this recognition easily, doing it fast is technically difficult. To facilitate a solution to this efficiency problem, we decided on a canonical representation for strings. A conventional representation of strings in a PO file is currently under discussion, and PO mode experiments with a canonical representation. Having both `xgettext' and PO mode converging towards a uniform way of representing equivalent strings would be useful, as the internal normalization needed by PO mode could be automatically satisfied when using `xgettext' from GNU `gettext'. An explicit PO mode normalization should then be only necessary for PO files imported from elsewhere, or for when the convention itself evolves. So, for achieving normalization of at least the strings of a given PO file needing a canonical representation, the following PO mode command is available: `M-x po-normalize' Tidy the whole PO file by making entries more uniform. The special command `M-x po-normalize', which has no associate keys, revises all entries, ensuring that strings of both original and translated entries use uniform internal quoting in the PO file. It also removes any crumb after the last entry. This command may be useful for PO files freshly imported from elsewhere, or if we ever improve on the canonical quoting format we use. This canonical format is not only meant for getting cleaner PO files, but also for greatly speeding up `msgid' string lookup for some other PO mode commands. `M-x po-normalize' presently makes three passes over the entries. The first implements heuristics for converting PO files for GNU `gettext' 0.6 and earlier, in which `msgid' and `msgstr' fields were using K&R style C string syntax for multi-line strings. These heuristics may fail for comments not related to obsolete entries and ending with a backslash; they also depend on subsequent passes for finalizing the proper commenting of continued lines for obsolete entries. This first pass might disappear once all oldish PO files would have been adjusted. The second and third pass normalize all `msgid' and `msgstr' strings respectively. They also clean out those trailing backslashes used by XView's `msgfmt' for continued lines. Having such an explicit normalizing command allows for importing PO files from other sources, but also eases the evolution of the current convention, evolution driven mostly by aesthetic concerns, as of now. It is easy to make suggested adjustments at a later time, as the normalizing command and eventually, other GNU `gettext' tools should greatly automate conformance. A description of the canonical string format is given below, for the particular benefit of those not having GNU Emacs handy, and who would nevertheless want to handcraft their PO files in nice ways. Right now, in PO mode, strings are single line or multi-line. A string goes multi-line if and only if it has *embedded* newlines, that is, if it matches `[^\n]\n+[^\n]'. So, we would have: msgstr "\n\nHello, world!\n\n\n" but, replacing the space by a newline, this becomes: msgstr "" "\n" "\n" "Hello,\n" "world!\n" "\n" "\n" We are deliberately using a caricatural example, here, to make the point clearer. Usually, multi-lines are not that bad looking. It is probable that we will implement the following suggestion. We might lump together all initial newlines into the empty string, and also all newlines introducing empty lines (that is, for N > 1, the N-1'th last newlines would go together on a separate string), so making the previous example appear: msgstr "\n\n" "Hello,\n" "world!\n" "\n\n" There are a few yet undecided little points about string normalization, to be documented in this manual, once these questions settle.  File: gettext.info, Node: Sources, Next: Initial, Prev: Basics, Up: Top Preparing Program Sources ************************* For the programmer, changes to the C source code fall into three categories. First, you have to make the localization functions known to all modules needing message translation. Second, you should properly trigger the operation of GNU `gettext' when the program initializes, usually from the `main' function. Last, you should identify and especially mark all constant strings in your program needing translation. Presuming that your set of programs, or package, has been adjusted so all needed GNU `gettext' files are available, and your `Makefile' files are adjusted (*note Maintainers::.), each C module having translated C strings should contain the line: #include The remaining changes to your C sources are discussed in the further sections of this chapter. * Menu: * Triggering:: Triggering `gettext' Operations * Mark Keywords:: How Marks Appears in Sources * Marking:: Marking Translatable Strings * c-format:: Telling something about the following string * Special cases:: Special Cases of Translatable Strings  File: gettext.info, Node: Triggering, Next: Mark Keywords, Prev: Sources, Up: Sources Triggering `gettext' Operations =============================== The initialization of locale data should be done with more or less the same code in every program, as demonstrated below: int main (argc, argv) int argc; char argv; { ... setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); ... } PACKAGE and LOCALEDIR should be provided either by `config.h' or by the Makefile. For now consult the `gettext' sources for more information. The use of `LC_ALL' might not be appropriate for you. `LC_ALL' includes all locale categories and especially `LC_CTYPE'. This later category is responsible for determining character classes with the `isalnum' etc. functions from `ctype.h' which could especially for programs, which process some kind of input language, be wrong. For example this would mean that a source code using the c, (c-cedilla character) is runnable in France but not in the U.S. Some systems also have problems with parsing number using the `scanf' functions if an other but the `LC_ALL' locale is used. The standards say that additional formats but the one known in the `"C"' locale might be recognized. But some systems seem to reject numbers in the `"C"' locale format. In some situation, it might also be a problem with the notation itself which makes it impossible to recognize whether the number is in the `"C"' locale or the local format. This can happen if thousands separator characters are used. Some locales define this character accordfing to the national conventions to `'.'' which is the same character used in the `"C"' locale to denote the decimal point. So it is sometimes necessary to replace the `LC_ALL' line in the code above by a sequence of `setlocale' lines { ... setlocale (LC_TIME, ""); setlocale (LC_MESSAGES, ""); ... } or to switch for and back to the character class in question. On all POSIX conformant systems the locale categories `LC_CTYPE', `LC_COLLATE', `LC_MONETARY', `LC_NUMERIC', and `LC_TIME' are available. On some modern systems there is also a locale `LC_MESSAGES' which is called on some old, XPG2 compliant systems `LC_RESPONSES'.  File: gettext.info, Node: Mark Keywords, Next: Marking, Prev: Triggering, Up: Sources How Marks Appears in Sources ============================ All strings requiring translation should be marked in the C sources. Marking is done in such a way that each translatable string appears to be the sole argument of some function or preprocessor macro. There are only a few such possible functions or macros meant for translation, and their names are said to be marking keywords. The marking is attached to strings themselves, rather than to what we do with them. This approach has more uses. A blatant example is an error message produced by formatting. The format string needs translation, as well as some strings inserted through some `%s' specification in the format, while the result from `sprintf' may have so many different instances that it is impractical to list them all in some `error_string_out()' routine, say. This marking operation has two goals. The first goal of marking is for triggering the retrieval of the translation, at run time. The keyword are possibly resolved into a routine able to dynamically return the proper translation, as far as possible or wanted, for the argument string. Most localizable strings are found in executable positions, that is, attached to variables or given as parameters to functions. But this is not universal usage, and some translatable strings appear in structured initializations. *Note Special cases::. The second goal of the marking operation is to help `xgettext' at properly extracting all translatable strings when it scans a set of program sources and produces PO file templates. The canonical keyword for marking translatable strings is `gettext', it gave its name to the whole GNU `gettext' package. For packages making only light use of the `gettext' keyword, macro or function, it is easily used *as is*. However, for packages using the `gettext' interface more heavily, it is usually more convenient to give the main keyword a shorter, less obtrusive name. Indeed, the keyword might appear on a lot of strings all over the package, and programmers usually do not want nor need their program sources to remind them forcefully, all the time, that they are internationalized. Further, a long keyword has the disadvantage of using more horizontal space, forcing more indentation work on sources for those trying to keep them within 79 or 80 columns. Many packages use `_' (a simple underline) as a keyword, and write `_("Translatable string")' instead of `gettext ("Translatable string")'. Further, the coding rule, from GNU standards, wanting that there is a space between the keyword and the opening parenthesis is relaxed, in practice, for this particular usage. So, the textual overhead per translatable string is reduced to only three characters: the underline and the two parentheses. However, even if GNU `gettext' uses this convention internally, it does not offer it officially. The real, genuine keyword is truly `gettext' indeed. It is fairly easy for those wanting to use `_' instead of `gettext' to declare: #include #define _(String) gettext (String) instead of merely using `#include '. Later on, the maintenance is relatively easy. If, as a programmer, you add or modify a string, you will have to ask yourself if the new or altered string requires translation, and include it within `_()' if you think it should be translated. `"%s: %d"' is an example of string *not* requiring translation!  File: gettext.info, Node: Marking, Next: c-format, Prev: Mark Keywords, Up: Sources Marking Translatable Strings ============================ In PO mode, one set of features is meant more for the programmer than for the translator, and allows him to interactively mark which strings, in a set of program sources, are translatable, and which are not. Even if it is a fairly easy job for a programmer to find and mark such strings by other means, using any editor of his choice, PO mode makes this work more comfortable. Further, this gives translators who feel a little like programmers, or programmers who feel a little like translators, a tool letting them work at marking translatable strings in the program sources, while simultaneously producing a set of translation in some language, for the package being internationalized. The set of program sources, targetted by the PO mode commands describe here, should have an Emacs tags table constructed for your project, prior to using these PO file commands. This is easy to do. In any shell window, change the directory to the root of your project, then execute a command resembling: etags src/*.[hc] lib/*.[hc] presuming here you want to process all `.h' and `.c' files from the `src/' and `lib/' directories. This command will explore all said files and create a `TAGS' file in your root directory, somewhat summarizing the contents using a special file format Emacs can understand. For packages following the GNU coding standards, there is a make goal `tags' or `TAGS' which construct the tag files in all directories and for all files containing source code. Once your `TAGS' file is ready, the following commands assist the programmer at marking translatable strings in his set of sources. But these commands are necessarily driven from within a PO file window, and it is likely that you do not even have such a PO file yet. This is not a problem at all, as you may safely open a new, empty PO file, mainly for using these commands. This empty PO file will slowly fill in while you mark strings as translatable in your program sources. `,' Search through program sources for a string which looks like a candidate for translation. `M-,' Mark the last string found with `_()'. `M-.' Mark the last string found with a keyword taken from a set of possible keywords. This command with a prefix allows some management of these keywords. The `,' (`po-tags-search') command search for the next occurrence of a string which looks like a possible candidate for translation, and displays the program source in another Emacs window, positioned in such a way that the string is near the top of this other window. If the string is too big to fit whole in this window, it is positioned so only its end is shown. In any case, the cursor is left in the PO file window. If the shown string would be better presented differently in different native languages, you may mark it using `M-,' or `M-.'. Otherwise, you might rather ignore it and skip to the next string by merely repeating the `,' command. A string is a good candidate for translation if it contains a sequence of three or more letters. A string containing at most two letters in a row will be considered as a candidate if it has more letters than non-letters. The command disregards strings containing no letters, or isolated letters only. It also disregards strings within comments, or strings already marked with some keyword PO mode knows (see below). If you have never told Emacs about some `TAGS' file to use, the command will request that you specify one from the minibuffer, the first time you use the command. You may later change your `TAGS' file by using the regular Emacs command `M-x visit-tags-table', which will ask you to name the precise `TAGS' file you want to use. *Note Tag Tables: (emacs)Tags. Each time you use the `,' command, the search resumes from where it was left by the previous search, and goes through all program sources, obeying the `TAGS' file, until all sources have been processed. However, by giving a prefix argument to the command (`C-u ,'), you may request that the search be restarted all over again from the first program source; but in this case, strings that you recently marked as translatable will be automatically skipped. Using this `,' command does not prevent using of other regular Emacs tags commands. For example, regular `tags-search' or `tags-query-replace' commands may be used without disrupting the independent `,' search sequence. However, as implemented, the *initial* `,' command (or the `,' command is used with a prefix) might also reinitialize the regular Emacs tags searching to the first tags file, this reinitialization might be considered spurious. The `M-,' (`po-mark-translatable') command will mark the recently found string with the `_' keyword. The `M-.' (`po-select-mark-and-mark') command will request that you type one keyword from the minibuffer and use that keyword for marking the string. Both commands will automatically create a new PO file untranslated entry for the string being marked, and make it the current entry (making it easy for you to immediately proceed to its translation, if you feel like doing it right away). It is possible that the modifications made to the program source by `M-,' or `M-.' render some source line longer than 80 columns, forcing you to break and re-indent this line differently. You may use the `O' command from PO mode, or any other window changing command from GNU Emacs, to break out into the program source window, and do any needed adjustments. You will have to use some regular Emacs command to return the cursor to the PO file window, if you want command `,' for the next string, say. The `M-.' command has a few built-in speedups, so you do not have to explicitly type all keywords all the time. The first such speedup is that you are presented with a *preferred* keyword, which you may accept by merely typing `' at the prompt. The second speedup is that you may type any non-ambiguous prefix of the keyword you really mean, and the command will complete it automatically for you. This also means that PO mode has to *know* all your possible keywords, and that it will not accept mistyped keywords. If you reply `?' to the keyword request, the command gives a list of all known keywords, from which you may choose. When the command is prefixed by an argument (`C-u M-.'), it inhibits updating any program source or PO file buffer, and does some simple keyword management instead. In this case, the command asks for a keyword, written in full, which becomes a new allowed keyword for later `M-.' commands. Moreover, this new keyword automatically becomes the *preferred* keyword for later commands. By typing an already known keyword in response to `C-u M-.', one merely changes the *preferred* keyword and does nothing more. All keywords known for `M-.' are recognized by the `,' command when scanning for strings, and strings already marked by any of those known keywords are automatically skipped. If many PO files are opened simultaneously, each one has its own independent set of known keywords. There is no provision in PO mode, currently, for deleting a known keyword, you have to quit the file (maybe using `q') and reopen it afresh. When a PO file is newly brought up in an Emacs window, only `gettext' and `_' are known as keywords, and `gettext' is preferred for the `M-.' command. In fact, this is not useful to prefer `_', as this one is already built in the `M-,' command.  File: gettext.info, Node: c-format, Next: Special cases, Prev: Marking, Up: Sources Special Comments preceding Keywords =================================== In C programs strings are often used within calls of functions from the `printf' family. The special thing about these format strings is that they can contain format specifiers introduced with `%'. Assume we have the code printf (gettext ("String `%s' has %d characters\n"), s, strlen (s)); A possible German translation for the above string might be: "%d Zeichen lang ist die Zeichenkette `%s'" A C programmer, even if he cannot speak German, will recognize that there is something wrong here. The order of the two format specifiers is changed but of course the arguments in the `printf' don't have. This will most probably lead to problems because now the length of the string is regarded as the address. To prevent errors at runtime caused by translations the `msgfmt' tool can check statically whether the arguments in the original and the translation string match in type and number. If this is not the case a warning will be given and the error cannot causes problems at runtime. If the word order in the above German translation would be correct one would have to write "%2$d Zeichen lang ist die Zeichenkette `%1$s'" The routines in `msgfmt' know about this special notation. Because not all strings in a program must be format strings it is not useful for `msgfmt' to test all the strings in the `.po' file. This might cause problems because the string might contain what looks like a format specifier, but the string is not used in `printf'. Therefore the `xgettext' adds a special tag to those messages it thinks might be a format string. There is no absolute rule for this, only a heuristic. In the `.po' file the entry is marked using the `c-format' flag in the `#,' comment line (*note PO Files::.). The careful reader now might say that this again can cause problems. The heuristic might guess it wrong. This is true and therefore `xgettext' knows about special kind of comment which lets the programmer take over the decision. If in the same line or the immediately preceding line of the `gettext' keyword the `xgettext' program find a comment containing the words `xgettext:c-format' it will mark the string in any case with the `c-format' flag. This kind of comment should be used when `xgettext' does not recognize the string as a format string but is really is one and it should be tested. Please note that when the comment is in the same line of the `gettext' keyword, it must be before the string to be translated. This situation happens quite often. The `printf' function is often called with strings which do not contain a format specifier. Of course one would normally use `fputs' but it does happen. In this case `xgettext' does not recognize this as a format string but what happens if the translation introduces a valid format specifier? The `printf' function will try to access one of the parameter but none exists because the original code does not refer to any parameter. `xgettext' of course could make a wrong decision the other way round. A string marked as a format string is not really a format string. In this case the `msgfmt' might give too many warnings and would prevent translating the `.po' file. The method to prevent this wrong decision is similar to the one used above, only the comment to use must contain the string `xgettext:no-c-format'. If a string is marked with `c-format' and this is not correct the user can find out who is responsible for the decision. *Note xgettext Invocation:: to see how the `--debug' option can be used for solving this problem.  File: gettext.info, Node: Special cases, Prev: c-format, Up: Sources Special Cases of Translatable Strings ===================================== The attentive reader might now point out that it is not always possible to mark translatable string with `gettext' or something like this. Consider the following case: { static const char *messages[] = { "some very meaningful message", "and another one" }; const char *string; ... string = index > 1 ? "a default message" : messages[index]; fputs (string); ... } While it is no problem to mark the string `"a default message"' it is not possible to mark the string initializers for `messages'. What is to be done? We have to fulfill two tasks. First we have to mark the strings so that the `xgettext' program (*note xgettext Invocation::.) can find them, and second we have to translate the string at runtime before printing them. The first task can be fulfilled by creating a new keyword, which names a no-op. For the second we have to mark all access points to a string from the array. So one solution can look like this: #define gettext_noop(String) (String) { static const char *messages[] = { gettext_noop ("some very meaningful message"), gettext_noop ("and another one") }; const char *string; ... string = index > 1 ? gettext ("a default message") : gettext (messages[index]); fputs (string); ... } Please convince yourself that the string which is written by `fputs' is translated in any case. How to get `xgettext' know the additional keyword `gettext_noop' is explained in *Note xgettext Invocation::. The above is of course not the only solution. You could also come along with the following one: #define gettext_noop(String) (String) { static const char *messages[] = { gettext_noop ("some very meaningful message", gettext_noop ("and another one") }; const char *string; ... string = index > 1 ? gettext_noop ("a default message") : messages[index]; fputs (gettext (string)); ... } But this has some drawbacks. First the programmer has to take care that he uses `gettext_noop' for the string `"a default message"'. A use of `gettext' could have in rare cases unpredictable results. The second reason is found in the internals of the GNU `gettext' Library which will make this solution less efficient. One advantage is that you need not make control flow analysis to make sure the output is really translated in any case. But this analysis is generally not very difficult. If it should be in any situation you can use this second method in this situation.  File: gettext.info, Node: Initial, Next: Updating, Prev: Sources, Up: Top Making the Initial PO File ************************** * Menu: * xgettext Invocation:: Invoking the `xgettext' Program * C Sources Context:: C Sources Context * Compendium:: Using Translation Compendiums  File: gettext.info, Node: xgettext Invocation, Next: C Sources Context, Prev: Initial, Up: Initial Invoking the `xgettext' Program =============================== xgettext [OPTION] INPUTFILE ... `-a' `--extract-all' Extract all strings. `-c [TAG]' `--add-comments[=TAG]' Place comment block with TAG (or those preceding keyword lines) in output file. `-C' `--c++' Recognize C++ style comments. `--debug' Use the flags `c-format' and `possible-c-format' to show who was responsible for marking a message as a format string. The later form is used if the `xgettext' program decided, the format form is used if the programmer prescribed it. By default only the `c-format' form is used. The translator should not have to care about these details. `-d NAME' `--default-domain=NAME' Use `NAME.po' for output (instead of `messages.po'). The special domain name `-' or `/dev/stdout' means to write the output to `stdout'. `-D DIRECTORY' `--directory=DIRECTORY' Change to DIRECTORY before beginning to search and scan source files. The resulting `.po' file will be written relative to the original directory, though. `-f FILE' `--files-from=FILE' Read the names of the input files from FILE instead of getting them from the command line. `--force' Always write output file even if no message is defined. `-h' `--help' Display this help and exit. `-I LIST' `--input-path=LIST' List of directories searched for input files. `-j' `--join-existing' Join messages with existing file. `-k WORD' `--keyword[=WORD]' Additonal keyword to be looked for (without WORD means not to use default keywords). The default keywords, which are always looked for if not explicitly disabled, are `gettext', `dgettext', `dcgettext' and `gettext_noop'. `-m [STRING]' `--msgstr-prefix[=STRING]' Use STRING or "" as prefix for msgstr entries. `-M [STRING]' `--msgstr-suffix[=STRING]' Use STRING or "" as suffix for msgstr entries. `--no-location' Do not write `#: FILENAME:LINE' lines. `-n' `--add-location' Generate `#: FILENAME:LINE' lines (default). `--omit-header' Don't write header with `msgid ""' entry. This is useful for testing purposes because it eliminates a source of variance for generated `.gmo' files. We can ship some of these files in the GNU `gettext' package, and the result of regenerating them through `msgfmt' should yield the same values. `-p DIR' `--output-dir=DIR' Output files will be placed in directory DIR. `-s' `--sort-output' Generate sorted output and remove duplicates. `--strict' Write out strict Uniforum conforming PO file. `-v' `--version' Output version information and exit. `-x FILE' `--exclude-file=FILE' Entries from FILE are not extracted. Search path for supplementary PO files is: `/usr/local/share/nls/src/'. If INPUTFILE is `-', standard input is read. This implementation of `xgettext' is able to process a few awkward cases, like strings in preprocessor macros, ANSI concatenation of adjacent strings, and escaped end of lines for continued strings.  File: gettext.info, Node: C Sources Context, Next: Compendium, Prev: xgettext Invocation, Up: Initial C Sources Context ================= PO mode is particularily powerful when used with PO files created through GNU `gettext' utilities, as those utilities insert special comments in the PO files they generate. Some of these special comments relate the PO file entry to exactly where the untranslated string appears in the program sources. When the translator gets to an untranslated entry, she is fairly often faced with an original string which is not as informative as it normally should be, being succinct, cryptic, or otherwise ambiguous. Before chosing how to translate the string, she needs to understand better what the string really means and how tight the translation has to be. Most of times, when problems arise, the only way left to make her judgment is looking at the true program sources from where this string originated, searching for surrounding comments the programmer might have put in there, and looking around for helping clues of *any* kind. Surely, when looking at program sources, the translator will receive more help if she is a fluent programmer. However, even if she is not versed in programming and feels a little lost in C code, the translator should not be shy at taking a look, once in a while. It is most probable that she will still be able to find some of the hints she needs. She will learn quickly to not feel uncomfortable in program code, paying more attention to programmer's comments, variable and function names (if he dared chosing them well), and overall organization, than to programmation itself. The following commands are meant to help the translator at getting program source context for a PO file entry. `s' Resume the display of a program source context, or cycle through them. `M-s' Display of a program source context selected by menu. `S' Add a directory to the search path for source files. `M-S' Delete a directory from the search path for source files. The commands `s' (`po-cycle-reference') and `M-s' (`po-select-source-reference') both open another window displaying some source program file, and already positioned in such a way that it shows an actual use of the string to be translated. By doing so, the command gives source program context for the string. But if the entry has no source context references, or if all references are unresolved along the search path for program sources, then the command diagnoses this as an error. Even if `s' (or `M-s') opens a new window, the cursor stays in the PO file window. If the translator really wants to get into the program source window, she ought to do it explicitly, maybe by using command `O'. When `s' is typed for the first time, or for a PO file entry which is different of the last one used for getting source context, then the command reacts by giving the first context available for this entry, if any. If some context has already been recently displayed for the current PO file entry, and the translator wandered off to do other things, typing `s' again will merely resume, in another window, the context last displayed. In particular, if the translator moved the cursor away from the context in the source file, the command will bring the cursor back to the context. By using `s' many times in a row, with no other commands intervening, PO mode will cycle to the next available contexts for this particular entry, getting back to the first context once the last has been shown. The command `M-s' behaves differently. Instead of cycling through references, it lets the translator choose of particular reference among many, and displays that reference. It is best used with completion, if the translator types `TAB' immediately after `M-s', in response to the question, she will be offered a menu of all possible references, as a reminder of which are the acceptable answers. This command is useful only where there are really many contexts available for a single string to translate. Program source files are usually found relative to where the PO file stands. As a special provision, when this fails, the file is also looked for, but relative to the directory immediately above it. Those two cases take proper care of most PO files. However, it might happen that a PO file has been moved, or is edited in a different place than its normal location. When this happens, the translator should tell PO mode in which directory normally sits the genuine PO file. Many such directories may be specified, and all together, they constitute what is called the "search path" for program sources. The command `S' (`po-consider-source-path') is used to interactively enter a new directory at the front of the search path, and the command `M-S' (`po-ignore-source-path') is used to select, with completion, one of the directories she does not want anymore on the search path.  File: gettext.info, Node: Compendium, Prev: C Sources Context, Up: Initial Using Translation Compendiums ============================= Compendiums are yet to be implemented. An incoming PO mode feature will let the translator maintain a compendium of already achieved translations. A "compendium" is a special PO file containing a set of translations recurring in many different packages. The translator will be given commands for adding entries to her compendium, and later initializing untranslated entries, or updating already translated entries, from translations kept in the compendium. For this to work, however, the compendium would have to be normalized. *Note Normalizing::.  File: gettext.info, Node: Updating, Next: Binaries, Prev: Initial, Up: Top Updating Existing PO Files ************************** * Menu: * msgmerge Invocation:: Invoking the `msgmerge' Program * Translated Entries:: * Fuzzy Entries:: * Untranslated Entries:: Untranslated Entries * Obsolete Entries:: Obsolete Entries * Modifying Translations:: Modifying Translations * Modifying Comments:: Modifying Comments * Auxiliary:: Consulting Auxiliary PO Files  File: gettext.info, Node: msgmerge Invocation, Next: Translated Entries, Prev: Updating, Up: Updating Invoking the `msgmerge' Program ===============================  File: gettext.info, Node: Translated Entries, Next: Fuzzy Entries, Prev: msgmerge Invocation, Up: Updating Translated Entries ================== Each PO file entry for which the `msgstr' field has been filled with a translation, and which is not marked as fuzzy (*note Fuzzy Entries::.), is a said to be a "translated" entry. Only translated entries will later be compiled by GNU `msgfmt' and become usable in programs. Other entry types will be excluded; translation will not occur for them. Some commands are more specifically related to translated entry processing. `t' Find the next translated entry. `M-t' Find the previous translated entry. The commands `t' (`po-next-translated-entry') and `M-t' (`po-previous-transted-entry') move forwards or backwards, chasing for an translated entry. If none is found, the search is extended and wraps around in the PO file buffer. Translated entries usually result from the translator having edited in a translation for them, *Note Modifying Translations::. However, if the variable `po-auto-fuzzy-on-edit' is not `nil', the entry having received a new translation first becomes a fuzzy entry, which ought to be later unfuzzied before becoming an official, genuine translated entry. *Note Fuzzy Entries::.  File: gettext.info, Node: Fuzzy Entries, Next: Untranslated Entries, Prev: Translated Entries, Up: Updating Fuzzy Entries ============= Each PO file entry may have a set of "attributes", which are qualities given an name and explicitely associated with the entry translation, using a special system comment. One of these attributes has the name `fuzzy', and entries having this attribute are said to have a fuzzy translation. They are called fuzzy entries, for short. Fuzzy entries, even if they account for translated entries for most other purposes, usually call for revision by the translator. Those may be produced by applying the program `msgmerge' to update an older translated PO files according to a new PO template file, when this tool hypothesises that some new `msgid' has been modified only slightly out of an older one, and chooses to pair what it thinks to be the old translation for the new modified entry. The slight alteration in the original string (the `msgid' string) should often be reflected in the translated string, and this requires the intervention of the translator. For this reason, `msgmerge' might mark some entries as being fuzzy. Also, the translator may decide herself to mark an entry as fuzzy for her own convenience, when she wants to remember that the entry has to be later revisited. So, some commands are more specifically related to fuzzy entry processing. `f' Find the next fuzzy entry. `M-f' Find the previous fuzzy entry. `TAB' Remove the fuzzy attribute of the current entry. The commands `f' (`po-next-fuzzy') and `M-f' (`po-previous-fuzzy') move forwards or backwards, chasing for a fuzzy entry. If none is found, the search is extended and wraps around in the PO file buffer. The command `TAB' (`po-unfuzzy') removes the fuzzy attribute associated with an entry, usually leaving it translated. Further, if the variable `po-auto-select-on-unfuzzy' has not the `nil' value, the `TAB' command will automatically chase for another interesting entry to work on. The initial value of `po-auto-select-on-unfuzzy' is `nil'. The initial value of `po-auto-fuzzy-on-edit' is `nil'. However, if the variable `po-auto-fuzzy-on-edit' is set to `t', any entry edited through the `RET' command is marked fuzzy, as a way to ensure some kind of double check, later. In this case, the usual paradigm is that an entry becomes fuzzy (if not already) whenever the translator modifies it. If she is satisfied with the translation, she then uses `TAB' to pick another entry to work on, clearing the fuzzy attribute on the same blow. If she is not satisfied yet, she merely uses `SPC' to chase another entry, leaving the entry fuzzy. The translator may also use the `DEL' command (`po-fade-out-entry') over any translated entry to mark it as being fuzzy, when she wants to easily leave a trace she wants to later return working at this entry. Also, when time comes to quit working on a PO file buffer with the `q' command, the translator is asked for confirmation, if fuzzy string still exists.  File: gettext.info, Node: Untranslated Entries, Next: Obsolete Entries, Prev: Fuzzy Entries, Up: Updating Untranslated Entries ==================== When `xgettext' originally creates a PO file, unless told otherwise, it initializes the `msgid' field with the untranslated string, and leaves the `msgstr' string to be empty. Such entries, having an empty translation, are said to be "untranslated" entries. Later, when the programmer slightly modifies some string right in the program, this change is later reflected in the PO file by the appearance of a new untranslated entry for the modified string. The usual commands moving from entry to entry consider untranslated entries on the same level as active entries. Untranslated entries are easily recognizable by the fact they end with `msgstr ""'. The work of the translator might be (quite naively) seen as the process of seeking after an untranslated entry, editing a translation for it, and repeating these actions until no untranslated entries remain. Some commands are more specifically related to untranslated entry processing. `u' Find the next untranslated entry. `M-u' Find the previous untranslated entry. `k' Turn the current entry into an untranslated one. The commands `u' (`po-next-untranslated-entry') and `M-u' (`po-previous-untransted-entry') move forwards or backwards, chasing for an untranslated entry. If none is found, the search is extended and wraps around in the PO file buffer. An entry can be turned back into an untranslated entry by merely emptying its translation, using the command `k' (`po-kill-msgstr'). *Note Modifying Translations::. Also, when time comes to quit working on a PO file buffer with the `q' command, the translator is asked for confirmation, if some untranslated string still exists.