[[!tag type/format]]
This plugin adds support for multi-lingual wikis, translated with
-gettext, using [po4a|http://po4a.alioth.debian.org/].
+gettext, using [po4a](http://po4a.alioth.debian.org/).
It depends on the Perl `Locale::Po4a::Po` library (`apt-get install po4a`).
+As detailed bellow in the security section, `po4a` is subject to
+denial-of-service attacks before version 0.35.
+
+[[!toc levels=2]]
Introduction
============
-A language is decided to be the "master" one, and any other supported
-language is a "slave" one. A page written in the "master" language is
-a "master" page, and is written in any supported format but PO.
+A language is chosen as the "master" one, and any other supported
+language is a "slave" one.
+
+A page written in the "master" language is a "master" page. It can be
+of any page type supported by ikiwiki, except `po`. It does not have to be
+named a special way: migration to this plugin does not imply any page
+renaming work.
Example: `bla/page.mdwn` is a "master" Markdown page written in
English; if `usedirs` is enabled, it is rendered as
-`bla/page/index.html`, else as `bla/page.html`.
+`bla/page/index.en.html`, else as `bla/page.en.html`.
-Translations of a "master" page into a "slave" language are called
-"slave" pages, and is a in gettext PO format. PO is thus promoted to
-the wiki page type status.
+Any translation of a "master" page into a "slave" language is called
+a "slave" page; it is written in the gettext PO format. `po` is now
+a page type supported by ikiwiki.
Example: `bla/page.fr.po` is the PO "message catalog" used to
translate `bla/page.mdwn` into French; if `usedirs` is enabled, it is
-rendered as `bla/page/index.html.fr`, else as `bla/page.html.fr`
+rendered as `bla/page/index.fr.html`, else as `bla/page.fr.html`
+
+(In)Compatibility
+=================
+
+This plugin does not support the `indexpages` mode. If you don't know
+what it is, you probably don't care.
Configuration
=============
-`po_master_language` is used to set the master language in
+Supported languages
+-------------------
+
+`po_master_language` is used to set the "master" language in
`ikiwiki.setup`, such as:
- po_master_language => { 'code' => 'en', 'name' => 'English' }
+ po_master_language => 'en|English'
`po_slave_languages` is used to set the list of supported "slave"
languages, such as:
- po_slave_languages => { 'fr' => { 'name' => 'Français', },
- 'es' => { 'name' => 'Castellano', },
- 'de' => { 'name' => 'Deutsch', },
- },
+ po_slave_languages => [ 'fr|Français',
+ 'es|Español',
+ 'de|Deutsch',
+ ]
+
+Decide which pages are translatable
+-----------------------------------
+
+The `po_translatable_pages` setting configures what pages are
+translatable. It is a [[ikiwiki/PageSpec]], so you have lots of
+control over what kind of pages are translatable.
+
+The `.po` files are not considered as being translatable, so you don't need to
+worry about excluding them explicitly from this [[ikiwiki/PageSpec]].
+
+Internal links
+--------------
+
+### Links targets
+
+The `po_link_to` option in `ikiwiki.setup` is used to decide how
+internal links should be generated, depending on web server features
+and site-specific preferences.
+
+#### Default linking behavior
+
+If `po_link_to` is unset, or set to `default`, ikiwiki's default
+linking behavior is preserved: `\[[destpage]]` links to the master
+language's page.
+
+#### Link to current language
+
+If `po_link_to` is set to `current`, `\[[destpage]]` links to the
+`destpage`'s version written in the current page's language, if
+available, *i.e.*:
+* `foo/destpage/index.LL.html` if `usedirs` is enabled
+* `foo/destpage.LL.html` if `usedirs` is disabled
+
+#### Link to negotiated language
+
+If `po_link_to` is set to `negotiated`, `\[[page]]` links to the
+negotiated preferred language, *i.e.* `foo/page/`.
+
+(In)compatibility notes:
+
+* if `usedirs` is disabled, it does not make sense to set `po_link_to`
+ to `negotiated`; this option combination is neither implemented
+ nor allowed.
+* if the web server does not support Content Negotiation, setting
+ `po_link_to` to `negotiated` will produce a unusable website.
Server support
==============
Apache
------
-Using `mod_negotiation` makes it really easy to have Apache serve the
-page in the client's preferred language, if available. This is the
-default Debian Apache configuration.
+Using Apache `mod_negotiation` makes it really easy to have Apache
+serve any page in the client's preferred language, if available.
+
+Add 'Options MultiViews' to the wiki directory's configuration in Apache.
-When `usedirs` is enabled, one has to set `DirectoryIndex index` for
-the wiki context.
+When `usedirs` is enabled, you should also set `DirectoryIndex index`.
-Setting `DefaultLanguage LL` for the wiki context can be needed, to
-ensure `bla/page/index.html` is served as `Content-Language: LL`
-(replace `LL` with your default MIME language).
+These settings are also recommended, in order to avoid serving up rss files
+as index pages:
+
+ AddType application/rss+xml;qs=0.8 .rss
+ AddType application/atom+xml;qs=0.8 .atom
+
+For details, see [Apache's documentation](http://httpd.apache.org/docs/2.2/content-negotiation.html).
lighttpd
--------
-lighttpd unfortunately does not support content negotiation.
+Recent versions of lighttpd should be able to use
+`$HTTP["language"]` to configure the translated pages to be served.
+See [Lighttpd Issue](http://redmine.lighttpd.net/issues/show/1119)
-TODO
-====
+TODO: Example
-Display available translations
-------------------------------
+Usage
+=====
-The [[linguas|plugins/contrib/linguas]] plugin has some code that can
-be used as a basis to display the existing translations, and allow to
-navigate between them.
+Templates
+---------
-View translation status
------------------------
+When `po_link_to` is not set to `negotiated`, one should replace some
+occurrences of `BASEURL` with `HOMEPAGEURL` to get correct links to
+the wiki homepage.
-One should be able to view some freshness information about the
-translation status, either for a given page or for the whole wiki.
+The `ISTRANSLATION` and `ISTRANSLATABLE` variables can be used to
+display things only on translatable or translation pages.
-This should not be too hard using gettext tools. If this is
-implemented as a
-[[HTML::Template|http://search.cpan.org/search?mode=dist&query=HTML%3A%3ATemplate]]
-loop, a page using it should depend on any "master" and "slave" pages
-whose status is being displayed.
+### Display page's versions in other languages
-Decide which pages are translatable
------------------------------------
+The `OTHERLANGUAGES` loop provides ways to display other languages'
+versions of the same page, and the translations' status.
+
+An example of its use can be found in the default
+`templates/page.tmpl`. In case you want to customize it, the following
+variables are available inside the loop (for every page in):
+
+* `URL` - url to the page
+* `CODE` - two-letters language code
+* `LANGUAGE` - language name (as defined in `po_slave_languages`)
+* `MASTER` - is true (1) if, and only if the page is a "master" page
+* `PERCENT` - for "slave" pages, is set to the translation completeness, in percents
-The subset of ("master") pages supporting translation must be
-configurable:
+### Display the current translation status
-- a `[[!translatable ]]` directive, when put on a page, makes it
- translatable
-- this [[ikiwiki/directive]] can be used with an optional `match=PageSpec`
- argument, to render translatable a bunch of pages at once
+The `PERCENTTRANSLATED` variable is set to the translation
+completeness, expressed in percent, on "slave" pages. It is used by
+the default `templates/page.tmpl`.
-Automatic PO files update
+Additional PageSpec tests
-------------------------
-Committing changes to a "master" page must:
+This plugin enhances the regular [[ikiwiki/PageSpec]] syntax with some
+additional tests that are documented [[here|ikiwiki/pagespec/po]].
-1. update the POT file, the PO files for the supported languages, and
- put them under version control
-2. trigger a refresh of the corresponding HTML slave pages
+Automatic PO file update
+------------------------
-The former can be implemented as a `needsbuild` hook, which is the
-first type of hook to run after the list of files that need to be
-built is known: that is, at a time when we know which "master" page
-was modified, and thus, which POT/PO files have to be updated.
+Committing changes to a "master" page:
-The latter can be implemented by making any "slave" page depend on the
-corresponding "master" page. The `add_depends` function can achieved
-this, if used in a FIXME hook.
+1. updates the POT file and the PO files for the "slave" languages;
+ the updated PO files are then put under version control;
+2. triggers a refresh of the corresponding HTML slave pages.
-UI consistency: rename "Edit" button on slave pages
----------------------------------------------------
+Also, when the plugin has just been enabled, or when a page has just
+been declared as being translatable, the needed POT and PO files are
+created, and the PO files are checked into version control.
-It may be surprising to some, after having pressed *Edit* on a wiki
-page, to end up editing a strange PO file. The *Edit* button must then
-be be renamed to *Improve translation* on "slave" pages.
+Discussion pages and other sub-pages
+------------------------------------
-Translation quality assurance
------------------------------
+Discussion should happen in the language in which the pages are
+written for real, *i.e.* the "master" one. If discussion pages are
+enabled, "slave" pages therefore link to the "master" page's
+discussion page.
-Modifying a PO file via the CGI must only be allowed if the new
-version is a valid PO file. As a bonus, check that it provides a more
-complete translation than the existing one.
+Likewise, "slave" pages are not supposed to have sub-pages;
+[[WikiLinks|ikiwiki/wikilink]] that appear on a "slave" page therefore link to
+the master page's sub-pages.
-A new `cansave` type of hook would be needed to implement this.
+Translating
+-----------
-Note: committing to the underlying repository is a way to bypass
-this check.
+One can edit the PO files using ikiwiki's CGI (a message-by-message
+interface could also be implemented at some point).
-Translating online
-------------------
+If [[tips/untrusted_git_push]] is setup, one can edit the PO files in one's
+preferred `$EDITOR`, without needing to be online.
-As PO is a wiki page type, we already have an online PO editor, that
-is ikiwiki's CGI.
+Markup languages support
+------------------------
-A message-by-message interface could be implemented later, providing
-a nice way to translate offline (without VCS access) is provided.
+[[Markdown|mdwn]] and [[html]] are well supported. Some other markup
+languages supported by ikiwiki mostly work, but some pieces of syntax
+are not rendered correctly on the slave pages:
-Translating offline without VCS access
---------------------------------------
+* [[reStructuredText|rst]]: anonymous hyperlinks and internal
+ cross-references
+* [[wikitext]]: conversion of newlines to paragraphs
+* [[creole]]: verbatim text is wrapped, tables are broken
+* LaTeX: not supported yet; the dedicated po4a module
+ could be used to support it, but it would need a security audit
+* other markup languages have not been tested.
-The following workflow should be made possible for translators without
-VCS access who need to edit the PO files in another editor than a web
-browser:
+Security
+========
-- download the PO file for the page
-- use any PO editor to update the translation
-- upload the updated PO file
+[[po/discussion]] contains a detailed security analysis of this plugin
+and its dependencies.
-A generic mechanism to download and upload a page's source is needed.
-It's only an alternative way to do Edit/edit/Save.
+When using po4a older than 0.35, it is recommended to uninstall
+`Text::WrapI18N` (Debian package `libtext-wrapi18n-perl`), in order to
+avoid a potential denial of service.
-### Short-term workflow
+BUGS
+====
+
+[[!inline pages="bugs/po:* and !bugs/done and !link(bugs/done) and !bugs/*/*"
+feeds=no actions=no archive=yes show=0]]
-- pretend to edit the PO file online
-- copy the PO file content from the textarea
-- cancel the edit
-- paste the content into a local file.
+TODO
+====
+[[!inline pages="todo/po:* and !todo/done and !link(todo/done) and !todo/*/*"
+feeds=no actions=no archive=yes show=0]]