diff options
Diffstat (limited to 'doc/todo/allow_site-wide_meta_definitions.mdwn')
| -rw-r--r-- | doc/todo/allow_site-wide_meta_definitions.mdwn | 208 |
1 files changed, 190 insertions, 18 deletions
diff --git a/doc/todo/allow_site-wide_meta_definitions.mdwn b/doc/todo/allow_site-wide_meta_definitions.mdwn index 70ccc2b68..82670250e 100644 --- a/doc/todo/allow_site-wide_meta_definitions.mdwn +++ b/doc/todo/allow_site-wide_meta_definitions.mdwn @@ -5,8 +5,159 @@ I'd like to define [[plugins/meta]] values to apply across all pages site-wide unless the pages define their own: default values for meta definitions essentially. -Here's a patch to achieve this (also in the "defaultmeta" branch of -my github ikiwiki fork): + <snip old patch, see below for latest> + +-- [[Jon]] + +> This doesn't support multiple-argument meta directives like +> `link=x rel=y`, or meta directives with special side-effects like +> `updated`. +> +> The first could be solved (if you care) by a syntax like this: +> +> meta_defaults => [ +> { copyright => "© me" }, +> { link => "about:blank", rel => "silly", }, +> ] +> +> The second could perhaps be solved by invoking `meta::preprocess` from within +> `scan` (which might be a simplification anyway), although this is complicated +> by the fact that some (but not all!) meta headers are idempotent. +> +> --[[smcv]] + +>> Thanks for your comment. I've revised the patch to use the config syntax +>> you suggest. I need to perform some more testing to make sure I've +>> addressed the issues you highlight. +>> +>> I had to patch part of IkiWiki core, the merge routine in Setup, because +>> the use of `possibly_foolish_untaint` was causing the hashrefs at the deep +>> end of the data structure to be converted into strings. The specific change +>> I've made may not be acceptable, though -- I'd appreciate someone providing +>> some feedback on that hunk! + +>>> Well, re that hunk, taint checking is currently disabled, but +>>> if the perl bug that disallows it is fixed and it is turned back on, +>>> the hash values will remain tainted, which will probably lead to +>>> problems. +>>> +>>> I'm also leery of using such a complex data structure in config. +>>> The websetup plugin would be hard pressed to provide a UI for such a +>>> data structure. (It lacks even UI for a single hash ref yet, let alone +>>> a list.) +>>> +>>> Also, it seems sorta wrong to have two so very different syntaxes to +>>> represent the same meta data. A user without a lot of experience will +>>> be hard pressed to map from a directive to this in the setup file. +>>> +>>> All of which leads me to think the setup file could just contain +>>> a text that could hold meta directives. Which generalizes really to +>>> a text that contains any directives, and is, perhaps appended to the +>>> top of every page. Which nearly generalizes to the sidebar plugin, +>>> or perhaps something more general than that... +>>> +>>> However, excessive generalization is the root of all evil, so +>>> I'm not necessarily saying that's a good idea. Indeed, my memory +>>> concerns below invalidate this idea pretty well. --[[Joey]] + + diff --git a/IkiWiki/Plugin/meta.pm b/IkiWiki/Plugin/meta.pm + index 6fe9cda..2f8c098 100644 + --- a/IkiWiki/Plugin/meta.pm + +++ b/IkiWiki/Plugin/meta.pm + @@ -13,6 +13,8 @@ sub import { + hook(type => "needsbuild", id => "meta", call => \&needsbuild); + hook(type => "preprocess", id => "meta", call => \&preprocess, scan => 1); + hook(type => "pagetemplate", id => "meta", call => \&pagetemplate); + + hook(type => "scan", id => "meta", call => \&scan) + + if $config{"meta_defaults"}; + } + + sub getsetup () { + @@ -305,6 +307,15 @@ sub match { + } + } + + +sub scan() { + + my %params = @_; + + my $page = $params{page}; + + foreach my $default (@{$config{"meta_defaults"}}) { + + preprocess(%$default, page => $page, + + destpage => $page, preview => 0); + + } + +} + + + package IkiWiki::PageSpec; + + sub match_title ($$;@) { + diff --git a/IkiWiki/Setup.pm b/IkiWiki/Setup.pm + index 8a25ecc..e4d50c9 100644 + --- a/IkiWiki/Setup.pm + +++ b/IkiWiki/Setup.pm + @@ -51,7 +51,13 @@ sub merge ($) { + $config{$c}=$setup{$c}; + } + else { + - $config{$c}=[map { IkiWiki::possibly_foolish_untaint($_) } @{$setup{$c}}] + + $config{$c}=[map { + + if(ref $_ eq 'HASH') { + + $_ + + } else { + + IkiWiki::possibly_foolish_untaint($_) + + } + + } @{$setup{$c}}]; + } + } + elsif (ref $setup{$c} eq 'HASH') { + diff --git a/doc/ikiwiki/directive/meta.mdwn b/doc/ikiwiki/directive/meta.mdwn + index 000f461..8d34ee4 100644 + --- a/doc/ikiwiki/directive/meta.mdwn + +++ b/doc/ikiwiki/directive/meta.mdwn + @@ -12,6 +12,16 @@ also specifies some additional sub-parameters. + The field values are treated as HTML entity-escaped text, so you can include + a quote in the text by writing `"` and so on. + + +You can also define site-wide defaults for meta values by including them + +in your setup file. The key used is `meta_defaults` and the value is a list + +of hashes, one per meta directive. e.g.: + + + + meta_defaults = [ + + { copyright => "Copyright 2007 by Joey Hess" }, + + { license => "GPL v2+" }, + + { link => "somepage", rel => "site entrypoint", }, + + ], + + + Supported fields: + + * title + +-- [[Jon]] + +>> Ok, I've had a bit of a think about this. There are currently 15 supported +>> meta fields. Of these: title, licence, copyright, author, authorurl, +>> and robots might make sense to define globally and override on a per-page +>> basis. +>> +>> Less so, description (due to its impact on map); openid (why would +>> someone want more than one URI to act as an openid endpoint to the same +>> place?); updated. I can almost see why someone might want to set a global +>> updated value. Almost. +>> +>> Not useful are permalink, date, stylesheet (you already have a global +>> stylesheet), link, redir, and guid. +>> +>> In other words, the limitations of my first patch that [[smcv]] outlined +>> are only relevant to defined fields that you wouldn't want to specify a +>> global default for anyway. +>> +>>> I generally agree with this. It is *possible* that meta would have a new +>>> field added, that takes parameters and make sense to use globally. +>>> --[[Joey]] +>> +>> Due to this, and the added complexity of the second patch (having to adjust +>> `IkiWiki/Setup.pm`), I think the first patch makes more sense. I've thus +>> reverted to it here. +>> +>> Is this merge-worthy? diff --git a/IkiWiki/Plugin/meta.pm b/IkiWiki/Plugin/meta.pm index b229592..3132257 100644 @@ -56,19 +207,40 @@ my github ikiwiki fork): -- [[Jon]] -> This doesn't support multiple-argument meta directives like -> `link=x rel=y`, or meta directives with special side-effects like -> `updated`. -> -> The first could be solved (if you care) by a syntax like this: -> -> meta_defaults => [ -> { copyright => "© me" }, -> { link => "about:blank", rel => "silly", }, -> ] -> -> The second could perhaps be solved by invoking `meta::preprocess` from within -> `scan` (which might be a simplification anyway), although this is complicated -> by the fact that some (but not all!) meta headers are idempotent. -> -> --[[smcv]] +>>> Merry Christmas/festive season/happy new year folks. I've been away from +>>> ikiwiki for the break, and now I've returned to watching recentchanges. +>>> Hopefully I'll be back in the mix soon, too. In the meantime, Joey, have +>>> you had a chance to look at this yet? -- [[Jon]] + +>>>> Ping :) Hi. [[Joey]], would you consider this patch for the next +>>>> ikiwiki release? -- [[Jon]] + +>>> For this to work with websetup and --dumpsetup, it needs to define the +>>> `meta_*` settings in the getsetup function. +>>>> +>>>> I think this will be problematic with the current implementation of this +>>>> patch. The datatype here is an array of hash references, with each hash +>>>> having a variable (and arbitrary) number of key/value pairs. I can't +>>>> think of an intuitive way of implementing a way of editing such a +>>>> datatype in the web interface, let alone registering the option in +>>>> getsetup. +>>>> +>>>> Perhaps a limited set of defined meta values could be exposed via +>>>> websetup (the obvious ones: author, copyright, license, etc.) -- [[Jon]] +>>> +>>> I also have some concerns about both these patches, since both throw +>>> a lot of redundant data at meta, which then stores it in a very redundant +>>> way. Specifically, meta populates a per-page `%metaheaders` hash +>>> as well as storing per-page metadata in `%pagestate`. So, if you have +>>> a wiki with 10 thousand pages, and you add a 1k site-wide license text, +>>> that will bloat the memory usage of ikiwiki by in excess of 2 +>>> megabytes. It will also cause ikiwiki to write a similar amount more data +>>> to its state file which has to be loaded back in each +>>> run. +>>> +>>> Seems that this could be managed much more efficiently by having +>>> meta special-case the site-wide settings, not store them in these +>>> per-page data structures, and just make them be used if no per-page +>>> metadata of the given type is present. --[[Joey]] +>>>> +>>>> that should be easy enough to do. I will work on a patch. -- [[Jon]] |