[[!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`).
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, but 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`
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_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' => 'Castellano',
+ '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 translations files are anyway not considered as being
+translatable, so you don't need to worry about excluding them
+explicitly from this [[ikiwiki/PageSpec]].
+
+Internal links
+--------------
+
+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.
+This is the default Debian Apache configuration.
When `usedirs` is enabled, one has to set `DirectoryIndex index` for
the wiki context.
-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).
+Setting `DefaultLanguage LL` (replace `LL` with your default MIME
+language code) for the wiki context can help to ensure
+`bla/page/index.en.html` is served as `Content-Language: LL`.
lighttpd
--------
lighttpd unfortunately does not support content negotiation.
+**FIXME**: does `mod_magnet` provide the functionality needed to
+ emulate this?
-TODO
-====
-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
------------------------
+The `ISTRANSLATION` and `ISTRANSLATABLE` variables can be used to
+display things only on translatable or translation pages.
-One should be able to view some freshness information about the
-translation status, either for a given page or for the whole wiki.
+### Display page's versions in other languages
-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.
+The `OTHERLANGUAGES` loop provides ways to display other languages'
+versions of the same page, and the translations' status.
-Decide which pages are translatable
------------------------------------
+One typically adds the following code to `templates/page.tmpl`:
+
+ <TMPL_IF NAME="OTHERLANGUAGES">
+ <div id="otherlanguages">
+ <ul>
+ <TMPL_LOOP NAME="OTHERLANGUAGES">
+ <li>
+ <a href="<TMPL_VAR NAME="URL">"><TMPL_VAR NAME="LANGUAGE"></a>
+ <TMPL_UNLESS NAME="MASTER">
+ (<TMPL_VAR NAME="PERCENT"> %)
+ </TMPL_UNLESS>
+ </li>
+ </TMPL_LOOP>
+ </ul>
+ </div>
+ </TMPL_IF>
+
+The following variables are available inside the loop (for every page in):
-The subset of ("master") pages supporting translation must be
-configurable:
+- `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
-- 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
+### Display the current translation status
+
+The `PERCENTTRANSLATED` variable is set to the translation
+completeness, expressed in percent, on "slave" pages.
+
+One can use it this way:
+
+ <TMPL_IF NAME="ISTRANSLATION">
+ <div id="percenttranslated">
+ <TMPL_VAR NAME="PERCENTTRANSLATED">
+ </div>
+ </TMPL_IF>
+
+Additional PageSpec tests
+-------------------------
+
+This plugin enhances the regular [[ikiwiki/PageSpec]] syntax with some
+additional tests that are documented [[here|ikiwiki/pagespec/po]].
Automatic PO files update
-------------------------
-Committing changes to a "master" page must:
+Committing changes to a "master" page:
+
+1. updates the POT file and the PO files for the supported languages
+ (this is done in the `needsbuild` hook); the updated PO files are
+ then put under version control
+2. triggers a refresh of the corresponding HTML slave pages (this is
+ achieved by making any "slave" page dependent on the corresponding
+ "master" page, in the `needsbuild` hook)
+
+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.
+
+Discussion pages
+----------------
+
+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.
+
+TODO
+====
+
+OTHERLANGUAGES dependencies
+---------------------------
+
+Pages using `OTHERLANGUAGES` depend on any "master" and "slave" pages
+whose status is being displayed. It is supposed to trigger dependency
+loops, but no practical bugs were noticed yet.
+
+Should pages using the `OTHERLANGUAGES` template loop be declared as
+linking to the same page in other versions? To be rigorous, they
+should, but this may clutter the backlinks.
+
+Security checks
+---------------
+
+- `refreshpofiles` uses `system()`, whose args have to be checked more
+ thoroughly to prevent any security issue (command injection, etc.).
+- `refreshpofiles` and `refreshpot` create new files; this may need
+ some checks, e.g. using `IkiWiki::prep_writefile()`
+
+gettext/po4a rough corners
+--------------------------
+
+- fix infinite loop when synchronizing two ikiwiki (when checkouts
+ live in different directories): say bla.fr.po has been updated in
+ repo2; pulling repo2 from repo1 seems to trigger a PO update, that
+ changes bla.fr.po in repo1; then pushing repo1 to repo2 triggers
+ a PO update, that changes bla.fr.po in repo2; etc.; fixed in
+ `629968fc89bced6727981c0a1138072631751fee`?
+- new translations created in the web interface must get proper charset/encoding
+ gettext metadata, else the next automatic PO update removes any non-ascii
+ chars; possible solution: put such metadata into the Pot file, and let it
+ propagate; should be fixed in `773de05a7a1ee68d2bed173367cf5e716884945a`, time
+ will tell.
+
+Misc. improvements
+------------------
+
+### automatic POT/PO update
+
+Use the `change` hook instead of `needsbuild`?
+
+### page titles
-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
+Use nice page titles from meta plugin in links, as inline already does.
-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.
+### websetup
-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.
+Which configuration settings are safe enough for websetup?
-UI consistency: rename "Edit" button on slave pages
----------------------------------------------------
+### parentlinks
-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.
+When the wiki home page is translatable, the parentlinks plugin sets
+`./index.html` as its translations' single parent link. Ideally, the home page's
+translations should get no parent link at all, just like the version written in
+the master language.
+
+### backlinks
+
+If a given translatable `sourcepage.mdwn` links to \[[destpage]],
+`sourcepage.LL.po` also link to \[[destpage]], and the latter has the master
+page *and* all its translations listed in the backlinks.
Translation quality assurance
-----------------------------
-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
+Modifying a PO file via the CGI must be forbidden if the new version
+is not a valid PO file. As a bonus, check that it provides a more
complete translation than the existing one.
A new `cansave` type of hook would be needed to implement this.
As PO is a wiki page type, we already have an online PO editor, that
is ikiwiki's CGI.
-A message-by-message interface could be implemented later, providing
-a nice way to translate offline (without VCS access) is provided.
+**FIXME** preview does not work for PO files.
+
+A message-by-message interface could also be implemented at some
+point; a nice way to do offline translation work (without VCS access)
+still has to be offered, though.
Translating offline without VCS access
--------------------------------------
VCS access who need to edit the PO files in another editor than a web
browser:
-- download the PO file for the page
+- download the page's PO file
- use any PO editor to update the translation
- upload the updated PO file
-A generic mechanism to download and upload a page's source is needed.
-It's only an alternative way to do Edit/edit/Save.
+Implementation note: a generic mechanism to upload a page's source is
+needed: it's only an alternative way to allow saving a the modified
+page's source with the CGI.
### Short-term workflow
+A possible workaround is:
+
- 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.
-
+- edit the local file in any PO editor
+- pretend to edit the PO file online
+- paste the modified local file's content into the edit textarea
+- save
sipb-www / ikiwiki.git / blobdiff