diff options
Diffstat (limited to 'doc/plugins')
| -rw-r--r-- | doc/plugins/po.mdwn | 300 | ||||
| -rw-r--r-- | doc/plugins/write.mdwn | 30 |
2 files changed, 330 insertions, 0 deletions
diff --git a/doc/plugins/po.mdwn b/doc/plugins/po.mdwn new file mode 100644 index 000000000..1412cfea2 --- /dev/null +++ b/doc/plugins/po.mdwn @@ -0,0 +1,300 @@ +[[!template id=plugin name=po core=0 author="[[intrigeri]]"]] +[[!tag type/format]] + +This plugin adds support for multi-lingual wikis, translated with +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 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.en.html`, else as `bla/page.en.html`. + +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.fr.html`, else as `bla/page.fr.html` + + +Configuration +============= + +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' => '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 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` (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? + + +Usage +===== + +Templates +--------- + +The `ISTRANSLATION` and `ISTRANSLATABLE` variables can be used to +display things only on translatable or translation pages. + +### Display page's versions in other languages + +The `OTHERLANGUAGES` loop provides ways to display other languages' +versions of the same page, and the translations' status. + +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): + +- `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 + +### 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: + +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. + +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 the duplicated PO header mysterious bug +- fix the "duplicate message definition" error when updating a PO + file; do PO files need normalizing? (may be a side effect of + previous bug) +- 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` ? + +Misc. improvements +------------------ + +### automatic POT/PO update + +Use the `change` hook instead of `needsbuild`? + +### page titles + +Use nice page titles from meta plugin in links, as inline already does. + +### websetup + +Which configuration settings are safe enough for websetup? + +Translation quality assurance +----------------------------- + +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. + +Note: committing to the underlying repository is a way to bypass +this check. + +Translating online +------------------ + +As PO is a wiki page type, we already have an online PO editor, that +is ikiwiki's CGI. + +**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 +-------------------------------------- + +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: + +- download the page's PO file +- use any PO editor to update the translation +- upload the updated PO file + +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 diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn index abcabbdc3..f147b0766 100644 --- a/doc/plugins/write.mdwn +++ b/doc/plugins/write.mdwn @@ -427,6 +427,36 @@ describes the plugin as a whole. For example: and undef if a rebuild could be needed in some circumstances, but is not strictly required. +### targetpage + + hook(type => "targetpage", id => "foo", call => \&targetpage); + +This hook can be used to override the name of the file a page should +be compiled into. + +It should return the target filename. + +### tweakurlpath + + hook(type => "tweakurlpath", id => "foo", call => \&tweakurlpath); + +This hook can be used to modify the internal urls generated by +ikiwiki; it is run just after ikiwiki has removed the trailing +`index.html`, in case `usedirs` is enabled. + +It should return the modified url. + +### tweakbestlink + + hook(type => "tweakbestlink", id => "foo", call => \&tweakbestlink); + +This hook can be used to modify the page returned by `bestlink`. It is +passed named parameters `page` and `link`. These are, respectively, +the page where the link will appear and the link ikiwiki would choose +as the best one, if no `tweakbestlink` hook was in effect. + +It should return the modified link. + ## Plugin interface To import the ikiwiki plugin interface: |