digitalmars.D.announce - [i18n] Gettext 1.0.1 released
- Bastiaan Veelo (189/189) Jul 18 Two years ago, H. S. Teoh presented a proof of concept for
- Ogi (15/16) Jul 19 Is this tested on Windows?
- Bastiaan Veelo (8/12) Jul 20 Yes, it is developed on Windows. Do the included tests work for
- Ogi (4/6) Jul 21 Hmm, I got it working by explicitly setting `targetType` to
- Jesse Phillips (2/2) Jul 21 Nice. I've really enjoyed gettext in C# in my verification of an
Bastiaan Veelo <Bastiaan Veelo.net> writes:
Two years ago, H. S. Teoh presented a proof of concept for [automatic extraction of gettext-style translation strings](https://forum.dlang.org/post/mailman.2526.1585832475.31109.digitalma s-d puremagic.com). I recently combined that idea with the existing [mofile](https://code.dlang.org/packages/mofile) package for reading translation tables in GNU gettext format, and the result is a feature rich solution for the support of multiple natural languages in D applications: https://code.dlang.org/packages/gettext. Perhaps not surprisingly, it can do more than GNU gettext itself. I'd like to thank Steven Schveighoffer and Adam Ruppe for [valuable forum assistance](https://forum.dlang.org/post/afkbwsdrspndwgkairaz forum.dlang.org), and SARC B.V. for sponsoring. Some extracts from the [readme](https://github.com/veelo/gettext#readme) are included below: - Concise translation markers that can be aliased to your preference. - All marked strings that are seen by the compiler are extracted automatically. - All (current and future) [D string literal formats](https://dlang.org/spec/lex.html#string_literals) are supported. - Static initializers of fields, constants, immutables, manifest constants and anonimous enums can be marked as translatable (a D specialty). - Concatenations of translatable strings, untranslated strings and single chars are supported, even in initializers. - Arrays of translatable strings are supported, also when statically initialized. - Plural forms are language dependent, and play nice with format strings. - Multiple identical strings are translated once, unless they are given different contexts. - Notes to the translator can be attached to individual translatable strings. - Code occurrences of strings are communicated to the translator. - Available languages are discovered and selected at run-time. - Platfom independent, not linked with C libraries. - Automated generation of the translation table template. - Automated merging into existing translations (requires [GNU `gettext` utilities](https://www.gnu.org/software/gettext/)). - Automated generation of binary translation tables (requires [GNU `gettext` utilities](https://www.gnu.org/software/gettext/)). - Includes utility for listing unmarked strings in the project. Prepend `tr!` in front of every string literal that needs to be translated. For instance: ```d writeln(tr!"This string is to be translated"); writeln("This string will remain untranslated."); ``` Sentences that should change in plural form depending on a number should supply both singlular and plural forms with the number like this: ```d // Before: writefln("%d green bottle(s) hanging on the wall", n); // After: writeln(tr!("one green bottle hanging on the wall", "%d green bottles hanging on the wall")(n)); ``` Note that the format specifier (`%d`, or `%s`, etc.) is optional in the singular form. Many languages have not just two forms like the English language does, and translations in those languages can supply all the forms that the particular language requires. This is handled by the translator, and is demonstrated in [the example below](https://github.com/veelo/gettext#example-1). If `tr` is too verbose for you, you can change it to whatever you want: ```d import gettext : _ = tr; writeln(_!"No green bottles..."); ``` Translatable strings can be format strings, used with `std.format` and `std.stdio.writefln` etc. These format strings do support plural forms, but the argument that determines the form must be supplied to `tr` and not to `format`. The corresponding format specifier will not be seen by `format` as it will have been replaced with a string by `tr`. Example: ```d format(tr!("Welcome %s, you may make a wish", "Welcome %s, you may make %d wishes")(n), name); ``` The format specifier that selects the form is the last specifier in the format string (here `%d`). In many sentences, however, the specifier that should select the form cannot be the last. In these cases, format specifiers must be given a position argument, where the highest position determines the form: ```d foreach (i, where; [tr!"hand", tr!"bush"]) format(tr!("One bird in the %1$s", "%2$d birds in the %1$s")(i + 1), where); ``` Again, the specifier with the highest position argument will never be seen by `format`. On a side note, some translations may need a reordering of words, so translators may need to use position arguments in their translated format strings anyway. Note: Specifiers with and without a position argument must not be mixed. Translators will be able to produce the best translations if they get to work with full sentences, like ```d auto message = format(tr!`Could not open the file "%s" for reading.`, file); ``` However, in support of legacy code, concatenations of strings do work: ```d auto message = tr!`Could not open the file "` ~ file ~ tr!`" for reading.`; ``` Optionally, two kinds of attributes can be passed to `tr`, in the form of an associative array initializer. These are for passing notes to the translator and for disambiguating identical sentences with different meanings. Sometimes a sentence can be interpreted to mean different things, and then it is important to be able to clarify things for the translator. Here is an example of how to do this: ```d auto name = tr!("Walter Bright", [Tr.note: "Proper name. Phonetically: ˈwɔltər braɪt"]); ``` The GNU `gettext` manual has a section [about the translation of proper names](https://www.gnu.org/software/gettext/manual/html_node/Names.html). Multiple occurrences of the same sentence are combined into one translation by default. In some cases, that may not work well. Some language, for example, may need to translate identical menu items in different menus differently. These can be disambiguated by adding a context like so: ```d auto labelOpenFile = tr!("Open", [Tr.context: "Menu|File"]); auto labelOpenPrinter = tr!("Open", [Tr.context: "Menu|File|Printer"]); ``` Notes and comments can be combined in any order: ```d auto message1 = tr!("Review the draft.", [Tr.context: "document"]); auto message2 = tr!("Review the draft.", [Tr.context: "nautical", Tr.note: `Nautical term! "Draft" = how deep ` ~ `the bottom of the ship is below ` ~ `the water level.`]); ``` Use the [following functions](https://gettext.dpldocs.info/v1.0.1/gettext.html#function) to discover translation tables, get the language code for a table and activate a translation: ```d string availableLanguages(string moPath = null) string languageCode() safe string languageCode(string moFile) safe void selectLanguage(string moFile) safe ``` Note that any translation that happens before a language is selected, results in the value of the hard coded string. See the [full readme](https://github.com/veelo/gettext#readme) for adding and updating translations, impact on footprint and performance, limitations, and lots more. Here's the result of two runs of one of the [examples](https://github.com/veelo/gettext/tree/main/tests): ``` Hello! My name is Joe. I'm counting one apple. Hello! My name is Schmoe. I'm counting 3 apples. Hello! My name is Jane. I'm counting 5 apples. Hello! My name is Doe. I'm counting 7 apples. ``` ``` Привіт! Мене звати Joe. Я рахую 1 яблуко. Привіт! Мене звати Schmoe. Я рахую 3 яблука. Привіт! Мене звати Jane. Я рахую 5 яблук. Привіт! Мене звати Doe. Я рахую 7 яблук. ``` Notice how the translation of "apple" in the last translation changes with three different endings dependent on the number of apples. -- Bastiaan.
Ogi <ogion.art gmail.com> writes:
On Monday, 18 July 2022 at 08:33:15 UTC, Bastiaan Veelo wrote:...Is this tested on Windows? ``` Performing "debug" build using C:\Apps\dmd\windows\bin64\dmd.exe for x86_64. gettexttest ~master: building configuration "default"... Running pre-build commands... Performing "debug" build using C:\Apps\dmd\windows\bin64\dmd.exe for x86_64. gettexttest ~master: target for configuration "xgettext" is up to date. Target is a library. Skipping execution. Command failed with exit code 2: dub run --config=xgettext ``` Gettext is installed and present in PATH.
Bastiaan Veelo <Bastiaan Veelo.net> writes:
On Tuesday, 19 July 2022 at 20:20:29 UTC, Ogi wrote:Is this tested on Windows?Yes, it is developed on Windows. Do the included tests work for you?``` Target is a library. Skipping execution. ```That is not right. Are you developing a library or an application? If you cannot get it to work, feel free to [open an issue](https://github.com/veelo/gettext/issues) and include your `dub.json`. -- Bastiaan.
Ogi <ogion.art gmail.com> writes:
On Wednesday, 20 July 2022 at 09:27:01 UTC, Bastiaan Veelo wrote:That is not right. Are you developing a library or an application?Hmm, I got it working by explicitly setting `targetType` to `executable`. It seems configuration recommended by Readme breaks Dub’s automatic target recognition.
Jesse Phillips <Jesse.K.Phillips+D gmail.com> writes:
application without gettext usage.