function injection overhaul
Add an inject function, that can be used by plugins that want to replace one of ikiwiki's functions with their own version. (This is a scary thing that grubs through the symbol table, and replaces all exported occurances of a function with the injected version.) external: RPC functions can be injected to replace exported functions. Removed the stupid displaytime hook, and use injection instead.master
Joey Hess
parent
92a43d5d38
commit
e75818572f
46
IkiWiki.pm
46
IkiWiki.pm
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@ -21,6 +21,7 @@ our @EXPORT = qw(hook debug error template htmlpage add_depends pagespec_match
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bestlink htmllink readfile writefile pagetype srcfile pagename
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displaytime will_render gettext urlto targetpage
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add_underlay pagetitle titlepage linkpage newpagefile
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inject
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%config %links %pagestate %wikistate %renderedfiles
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%pagesources %destsources);
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our $VERSION = 2.00; # plugin interface version, next is ikiwiki version
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@ -898,23 +899,13 @@ sub abs2rel ($$) { #{{{
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} #}}}
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sub displaytime ($;$) { #{{{
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my $time=shift;
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my $format=shift;
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if (exists $hooks{displaytime}) {
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my $ret;
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run_hooks(displaytime => sub {
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$ret=shift->($time, $format)
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});
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return $ret;
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}
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else {
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return formattime($time, $format);
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}
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# Plugins can override this function to mark up the time to
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# display.
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return '<span class="date">'.formattime(@_).'</span>';
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} #}}}
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sub formattime ($;$) { #{{{
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# Plugins can override this function to mark up the time for
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# display.
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# Plugins can override this function to format the time.
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my $time=shift;
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my $format=shift;
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if (! defined $format) {
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@ -1676,6 +1667,31 @@ sub yesno ($) { #{{{
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return (defined $val && lc($val) eq gettext("yes"));
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} #}}}
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sub inject { #{{{
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# Injects a new function into the symbol table to replace an
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# exported function.
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my %params=@_;
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# This is deep ugly perl foo, beware.
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no strict;
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no warnings;
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if (! defined $params{parent}) {
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$params{parent}='::';
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$params{old}=\&{$params{name}};
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$params{name}=~s/.*:://;
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}
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my $parent=$params{parent};
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foreach my $ns (grep /^\w+::/, keys %{$parent}) {
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$ns = $params{parent} . $ns;
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inject(%params, parent => $ns) unless $ns eq '::main::';
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*{$ns . $params{name}} = $params{call}
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if exists ${$ns}{$params{name}} &&
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\&{${$ns}{$params{name}}} == $params{old};
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}
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use strict;
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use warnings;
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} #}}}
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sub pagespec_merge ($$) { #{{{
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my $a=shift;
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my $b=shift;
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@ -1770,7 +1786,7 @@ sub pagespec_valid ($) { #{{{
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my $sub=pagespec_translate($spec);
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return ! $@;
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} #}}}
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sub glob2re ($) { #{{{
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my $re=quotemeta(shift);
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$re=~s/\\\*/.*/g;
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@ -202,10 +202,16 @@ sub inject ($@) { #{{{
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my $sub = sub {
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IkiWiki::Plugin::external::rpc_call($plugin, $params{call}, @_)
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};
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$sub=memoize($sub) if $params{memoize};
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# This will add it to the symbol table even if not present.
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no warnings;
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eval qq{*$params{name}=\$sub};
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use warnings;
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memoize($params{name}) if $params{memoize};
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# This will ensure that everywhere it was exported to sees
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# the injected version.
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IkiWiki::inject(name => $params{name}, call => $sub);
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return 1;
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} #}}}
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@ -12,7 +12,7 @@ sub import { #{{{
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add_underlay("javascript");
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hook(type => "getsetup", id => "relativedate", call => \&getsetup);
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hook(type => "format", id => "relativedate", call => \&format);
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hook(type => "displaytime", id => "relativedate", call => \&display);
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inject(name => "IkiWiki::displaytime", call => \&mydisplaytime);
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} # }}}
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sub getsetup () { #{{{
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@ -43,7 +43,7 @@ sub include_javascript ($;$) { #{{{
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'" type="text/javascript" charset="utf-8"></script>';
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} #}}}
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sub display ($;$) { #{{{
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sub mydisplaytime ($;$) { #{{{
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my $time=shift;
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my $format=shift;
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@ -24,6 +24,11 @@ ikiwiki (2.68) UNRELEASED; urgency=low
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the toplevel tagpage, and not closer subpages. The html links already went
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there, but internally the links were not recorded as absolute, which could
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cause confusing backlinks etc.
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* Add an inject function, that can be used by plugins that want to
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replace one of ikiwiki's functions with their own version.
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(This is a scary thing that grubs through the symbol table, and replaces
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all exported occurances of a function with the injected version.)
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* external: RPC functions can be injected to replace exported functions.
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-- Joey Hess <joeyh@debian.org> Fri, 17 Oct 2008 20:11:02 -0400
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@ -47,6 +47,11 @@ Any thoughts on this?
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>>> `targetpage`, `bestlink`, and `beautify_urlpath`. But, I noticed
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>>> the other day that such wrappers around exported functions are only visible by
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>>> plugins loaded after the plugin that defines them.
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>>>
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>>> Update: Take a look at the new "Function overriding" section of
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>>> [[plugins/write]]. I think you can just inject wrappers about a few ikiwiki
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>>> functions, rather than adding hooks. The `inject` function is pretty
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>>> insane^Wlow level, but seems to work great. --[[Joey]]
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>>
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>> The Discussion pages issue is something I am not sure about yet. But I will
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>> probably decide that "slave" pages, being only translations, don't deserve
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@ -854,6 +854,56 @@ By the way, to parse a ikiwiki setup file and populate `%config`, a
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program just needs to do something like:
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`use IkiWiki::Setup; IkiWiki::Setup::load($filename)`
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### Function overriding
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Sometimes using ikiwiki's pre-defined hooks is not enough. Your plugin
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may need to replace one of ikiwiki's own functions with a modified version,
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or wrap one of the functions.
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For example, your plugin might want to override `displaytime`, to change
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the html markup used when displaying a date. Or it might want to override
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`IkiWiki::formattime`, to change how a date is formatted. Or perhaps you
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want to override `bestlink` and change how ikiwiki deals with WikiLinks.
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By venturing into this territory, your plugin is becoming tightly tied to
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ikiwiki's internals. And it might break if those internals change. But
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don't let that stop you, if you're brave.
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Ikiwiki provides an `inject()` function, that is a powerful way to replace
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any function with one of your own. This even allows you to inject a
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replacement for an exported function, like `bestlink`. Everything that
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imports that function will get your version instead. Pass it the name of
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the function to replace, and a new function to call.
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For example, here's how to replace `displaytime` with a version using HTML 5
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markup:
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inject(name => 'IkiWiki::displaytime', call => sub {
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return "<time>".formattime(@_)."</time>";
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});
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Here's how to wrap `bestlink` with a version that tries to handle
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plural words:
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my $origbestlink=\&bestlink;
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inject(name => 'IkiWiki::bestlink', call => \&mybestlink);
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sub deplural ($) {
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my $word=shift;
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$word =~ s/e?s$//; # just an example :-)
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return $word;
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}
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sub mybestlink ($$) {
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my $page=shift;
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my $link=shift;
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my $ret=$origbestlink->($page, $link);
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if (! length $ret) {
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$ret=$origbestlink->($page, deplural($link));
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}
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return $ret;
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}
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### Javascript
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Some plugins use javascript to make ikiwiki look a bit more web-2.0-ish.
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@ -106,9 +106,8 @@ sub import {
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rpc_call("getvar", "config", "url")."\n";
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# Here's an example of how to inject an arbitrary function into
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# ikiwiki, replacing a core function.
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# Note use of automatic memoization.
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rpc_call("inject", name => "IkiWiki::formattime",
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# ikiwiki. Note use of automatic memoization.
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rpc_call("inject", name => "IkiWiki::bob",
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call => "formattime", memoize => 1);
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print STDERR "externaldemo plugin successfully imported\n";
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@ -126,9 +125,8 @@ sub preprocess {
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return "externaldemo plugin preprocessing on $title!";
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}
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sub formattime {
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print STDERR "externaldemo plugin's formattime called via RPC";
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return scalar "formatted time: ".localtime(shift);
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sub bob {
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print STDERR "externaldemo plugin's bob called via RPC";
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}
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# Now all that's left to do is loop and handle each incoming RPC request.
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@ -8,7 +8,7 @@ msgid ""
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msgstr ""
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"Project-Id-Version: PACKAGE VERSION\n"
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"Report-Msgid-Bugs-To: \n"
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"POT-Creation-Date: 2008-10-19 20:06-0400\n"
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"POT-Creation-Date: 2008-10-21 17:51-0400\n"
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"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
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"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
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"Language-Team: LANGUAGE <LL@li.org>\n"
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@ -48,7 +48,7 @@ msgstr ""
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msgid "You are banned."
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msgstr ""
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#: ../IkiWiki/CGI.pm:385 ../IkiWiki/CGI.pm:386 ../IkiWiki.pm:1182
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#: ../IkiWiki/CGI.pm:385 ../IkiWiki/CGI.pm:386 ../IkiWiki.pm:1175
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msgid "Error"
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msgstr ""
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@ -913,25 +913,25 @@ msgstr ""
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msgid "refreshing wiki.."
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msgstr ""
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#: ../IkiWiki.pm:458
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#: ../IkiWiki.pm:459
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msgid "Must specify url to wiki with --url when using --cgi"
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msgstr ""
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#: ../IkiWiki.pm:504
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#: ../IkiWiki.pm:505
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msgid "cannot use multiple rcs plugins"
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msgstr ""
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#: ../IkiWiki.pm:533
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#: ../IkiWiki.pm:534
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#, perl-format
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msgid "failed to load external plugin needed for %s plugin: %s"
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msgstr ""
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#: ../IkiWiki.pm:1165
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#: ../IkiWiki.pm:1158
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#, perl-format
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msgid "preprocessing loop detected on %s at depth %i"
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msgstr ""
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#: ../IkiWiki.pm:1674
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#: ../IkiWiki.pm:1667
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msgid "yes"
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msgstr ""
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