X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/ca5f64c4ef85dc0e5187f80f3f108b623ac01470..e75818572fff5256d16221a2b065b214d8cb9f5d:/doc/plugins/write.mdwn?ds=sidebyside
diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index b9601ea57..2e11e6234 100644
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -123,7 +123,7 @@ make arbitrary changes. The function is passed named parameters "page",
### preprocess
-Adding a [[ikiwiki/PreProcessorDirective]] is probably the most common use
+Adding a preprocessor [[ikiwiki/directive]] is probably the most common use
of a plugin.
hook(type => "preprocess", id => "foo", call => \&preprocess);
@@ -158,7 +158,7 @@ can assume it's being run in scan mode, and avoid doing expensive things at
that point.)
Note that if the [[htmlscrubber]] is enabled, html in
-[[ikiwiki/PreProcessorDirective]] output is sanitised, which may limit what
+preprocessor [[ikiwiki/directive]] output is sanitised, which may limit what
your plugin can do. Also, the rest of the page content is not in html
format at preprocessor time. Text output by a preprocessor directive will
be linkified and passed through markdown (or whatever engine is used to
@@ -188,11 +188,14 @@ languages to ikiwiki.
The function is passed named parameters: "page" and "content" and should
return the htmlized content.
+If `hook` is passed an optional "keepextension" parameter, set to a true
+value, then this extension will not be stripped from the source filename when
+generating the page.
+
### pagetemplate
hook(type => "pagetemplate", id => "foo", call => \&pagetemplate);
-
[[Templates|wikitemplates]] are filled out for many different things in
ikiwiki, like generating a page, or part of a blog page, or an rss feed, or
a cgi. This hook allows modifying the variables available on those
@@ -357,6 +360,13 @@ This hook is called whenever ikiwiki normally saves its state, just before
the state is saved. The function can save other state, modify values before
they're saved, etc.
+### displaytime
+
+ hook(type => "displaytime", id => "foo", call => \&display);
+
+This hook can be registered to override the regular `displaytime` function.
+Only the last displaytime hook will be used.
+
### renamepage
hook(type => "renamepage", id => "foo", call => \&renamepage);
@@ -449,8 +459,8 @@ your ikiwiki setup file, which sets the hash content to configure the wiki.
The `%pagestate` hash can be used by plugins to save state that they will need
next time ikiwiki is run. The hash holds per-page state, so to set a value,
-use `%pagestate{$page}{$id}{$key}=$value`, and to retrieve the value,
-use `%pagestate{$page}{$id}{$key}`.
+use `$pagestate{$page}{$id}{$key}=$value`, and to retrieve the value,
+use `$pagestate{$page}{$id}{$key}`.
The `$value` can be anything that perl's Storable module is capable of
serializing. `$key` can be any string you like, but `$id` must be the same
@@ -463,6 +473,15 @@ When pages are deleted, ikiwiki automatically deletes their pagestate too.
Note that page state does not persist across wiki rebuilds, only across
wiki updates.
+### %wikistate
+
+The `%wikistate` hash can be used by a plugin to store persistant state
+that is not bound to any one page. To set a value, use
+`$wikistate{$id}{$key}=$value, where `$value` is anything Storable can
+serialize, `$key` is any string you like, and `$id` must be the same as the
+"id" parameter passed to `hook()` when registering the plugin, so that the
+state can be dropped if the plugin is no longer used.
+
### Other variables
If your plugin needs to access data about other pages in the wiki. It can
@@ -500,7 +519,7 @@ function that is called after the error message is printed, to do any final
cleanup.
If called inside a preprocess hook, error() does not abort the entire
-wiki build, but instead replaces the [[ikiwiki/PreProcessorDirective]] with
+wiki build, but instead replaces the preprocessor [[ikiwiki/directive]] with
a version containing the error message.
In other hooks, error() is a fatal error, so use with care. Try to avoid
@@ -518,6 +537,9 @@ parameters are passed to `HTML::Template->new`.
Passed a page name, returns the base name that will be used for a the html
page created from it. (Ie, it appends ".html".)
+Use this when constructing the filename of a html file. Use `urlto` when
+generating a link to a page.
+
#### `add_depends($$)`
Makes the specified page depend on the specified [[ikiwiki/PageSpec]].
@@ -620,6 +642,23 @@ a type that ikiwiki knowns how to htmlize. Otherwise, returns undef.
Given the name of a source file, returns the name of the wiki page
that corresponds to that file.
+#### `pagetitle($)`
+
+Give the name of a wiki page, returns a version suitable to be displayed as
+the page's title. This is accomplished by de-escaping escaped characters in
+the page name. "_" is replaced with a space, and '__NN__' is replaced by
+the UTF character with code NN.
+
+#### `titlepage($)`
+
+This performs the inverse of `pagetitle`, ie, it converts a page title into
+a wiki page name.
+
+#### `linkpage($)`
+
+This converts text that could have been entered by the user as a
+[[WikiLink]] into a wiki page name.
+
#### `srcfile($;$)`
Given the name of a source file in the wiki, searches for the file in
@@ -658,6 +697,12 @@ destination file, as registered by `will_render`.
If the third parameter is passed and is true, an absolute url will be
constructed instead of the default relative url.
+#### `newpagefile($$)`
+
+This can be called when creating a new page, to determine what filename
+to save the page to. It's passed a page name, and its type, and returns
+the name of the file to create, relative to the srcdir.
+
#### `targetpage($$)`
Passed a page and an extension, returns the filename that page will be
@@ -719,8 +764,8 @@ Changes can be staged by calls to `rcs_add, `rcs_remove`, and
Adds the passed file to the archive. The filename is relative to the root
of the srcdir.
-Note that this should not check the new file in, it should only
-prepare for it to be checked in when rcs_commit (or `rcs_commit_staged`) is
+Note that this should not commit the new file, it should only
+prepare for it to be committed when rcs_commit (or `rcs_commit_staged`) is
called. Note that the file may be in a new subdir that is not yet in
to version control; the subdir can be added if so.
@@ -728,9 +773,9 @@ to version control; the subdir can be added if so.
Remove a file. The filename is relative to the root of the srcdir.
-Note that this should not check the removal in, it should only prepare for it
-to be checked in when `rcs_commit` (or `rcs_commit_staged`) is called. Note
-that the new file may be in a new subdir that is not yet inversion
+Note that this should not commit the removal, it should only prepare for it
+to be committed when `rcs_commit` (or `rcs_commit_staged`) is called. Note
+that the new file may be in a new subdir that is not yet in version
control; the subdir can be added if so.
#### `rcs_rename($$)`
@@ -805,6 +850,85 @@ when imported, populate `$IkiWiki::Setup::raw_setup` with a reference
to a hash containing all the config items. They should also implement a
`gendump` function.
-By the way, to parse a ikiwiki setup file, a program just needs to
-do something like:
-`use IkiWiki::Setup; my %setup=IkiWiki::Setup::load($filename)`
+By the way, to parse a ikiwiki setup file and populate `%config`, a
+program just needs to do something like:
+`use IkiWiki::Setup; IkiWiki::Setup::load($filename)`
+
+### Function overriding
+
+Sometimes using ikiwiki's pre-defined hooks is not enough. Your plugin
+may need to replace one of ikiwiki's own functions with a modified version,
+or wrap one of the functions.
+
+For example, your plugin might want to override `displaytime`, to change
+the html markup used when displaying a date. Or it might want to override
+`IkiWiki::formattime`, to change how a date is formatted. Or perhaps you
+want to override `bestlink` and change how ikiwiki deals with WikiLinks.
+
+By venturing into this territory, your plugin is becoming tightly tied to
+ikiwiki's internals. And it might break if those internals change. But
+don't let that stop you, if you're brave.
+
+Ikiwiki provides an `inject()` function, that is a powerful way to replace
+any function with one of your own. This even allows you to inject a
+replacement for an exported function, like `bestlink`. Everything that
+imports that function will get your version instead. Pass it the name of
+the function to replace, and a new function to call.
+
+For example, here's how to replace `displaytime` with a version using HTML 5
+markup:
+
+ inject(name => 'IkiWiki::displaytime', call => sub {
+ return "";
+ });
+
+Here's how to wrap `bestlink` with a version that tries to handle
+plural words:
+
+ my $origbestlink=\&bestlink;
+ inject(name => 'IkiWiki::bestlink', call => \&mybestlink);
+
+ sub deplural ($) {
+ my $word=shift;
+ $word =~ s/e?s$//; # just an example :-)
+ return $word;
+ }
+
+ sub mybestlink ($$) {
+ my $page=shift;
+ my $link=shift;
+ my $ret=$origbestlink->($page, $link);
+ if (! length $ret) {
+ $ret=$origbestlink->($page, deplural($link));
+ }
+ return $ret;
+ }
+
+### Javascript
+
+Some plugins use javascript to make ikiwiki look a bit more web-2.0-ish.
+
+All javascript code should be put in `.js` files in the `javascript`
+underlay, and plugins using those files can enable use of the underlay by
+calling `add_underlay("javascript");` in their `import` function.
+
+You'll have to arrange for `