Dominic Hargreaves > Wiki-Toolkit-0.80 > Wiki::Toolkit

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Module Version: 0.80   Source   Latest Release: Wiki-Toolkit-0.84

NAME ^

Wiki::Toolkit - A toolkit for building Wikis.

DESCRIPTION ^

Helps you develop Wikis quickly by taking care of the boring bits for you. You will still need to write some code - this isn't an instant Wiki.

SYNOPSIS ^

  # Set up a wiki object with an SQLite storage backend, and an
  # inverted index/DB_File search backend.  This store/search
  # combination can be used on systems with no access to an actual
  # database server.

  my $store     = Wiki::Toolkit::Store::SQLite->new(
      dbname => "/home/wiki/store.db" );
  my $indexdb   = Search::InvertedIndex::DB::DB_File_SplitHash->new(
      -map_name  => "/home/wiki/indexes.db",
      -lock_mode => "EX" );
  my $search    = Wiki::Toolkit::Search::SII->new(
      indexdb => $indexdb );

  my $wiki      = Wiki::Toolkit->new( store     => $store,
                                      search    => $search );

  # Do all the CGI stuff.
  my $q      = CGI->new;
  my $action = $q->param("action");
  my $node   = $q->param("node");

  if ($action eq 'display') {
      my $raw    = $wiki->retrieve_node($node);
      my $cooked = $wiki->format($raw);
      print_page(node    => $node,
                 content => $cooked);
  } elsif ($action eq 'preview') {
      my $submitted_content = $q->param("content");
      my $preview_html      = $wiki->format($submitted_content);
      print_editform(node    => $node,
                     content => $submitted_content,
                     preview => $preview_html);
  } elsif ($action eq 'commit') {
      my $submitted_content = $q->param("content");
      my $cksum = $q->param("checksum");
      my $written = $wiki->write_node($node, $submitted_content, $cksum);
      if ($written) {
          print_success($node);
      } else {
          handle_conflict($node, $submitted_content);
      }
  }

METHODS ^

new
  # Set up store, search and formatter objects.
  my $store     = Wiki::Toolkit::Store::SQLite->new(
      dbname => "/home/wiki/store.db" );
  my $indexdb   = Search::InvertedIndex::DB::DB_File_SplitHash->new(
      -map_name  => "/home/wiki/indexes.db",
      -lock_mode => "EX" );
  my $search    = Wiki::Toolkit::Search::SII->new(
      indexdb => $indexdb );
  my $formatter = My::HomeMade::Formatter->new;

  my $wiki = Wiki::Toolkit->new(
      store     => $store,     # mandatory
      search    => $search,    # defaults to undef
      formatter => $formatter  # defaults to something suitable
  );

store must be an object of type Wiki::Toolkit::Store::* and search if supplied must be of type Wiki::Toolkit::Search::* (though this isn't checked yet - FIXME). If formatter isn't supplied, it defaults to an object of class Wiki::Toolkit::Formatter::Default.

You can get a searchable Wiki up and running on a system without an actual database server by using the SQLite storage backend with the SII/DB_File search backend - cut and paste the lines above for a quick start, and see Wiki::Toolkit::Store::SQLite, Wiki::Toolkit::Search::SII, and Search::InvertedIndex::DB::DB_File_SplitHash when you want to learn the details.

formatter can be any object that behaves in the right way; this essentially means that it needs to provide a format method which takes in raw text and returns the formatted version. See Wiki::Toolkit::Formatter::Default for a simple example. Note that you can create a suitable object from a sub very quickly by using Test::MockObject like so:

  my $formatter = Test::MockObject->new();
  $formatter->mock( 'format', sub { my ($self, $raw) = @_;
                                    return uc( $raw );
                                  } );

I'm not sure whether to put this in the module or not - it'd let you just supply a sub instead of an object as the formatter, but it feels wrong to be using a Test::* module in actual code.

retrieve_node
  my $content = $wiki->retrieve_node($node);

  # Or get additional data about the node as well.
  my %node = $wiki->retrieve_node("HomePage");
  print "Current Version: " . $node{version};

  # Maybe we stored some of our own custom metadata too.
  my $categories = $node{metadata}{category};
  print "Categories: " . join(", ", @$categories);
  print "Postcode: $node{metadata}{postcode}[0]";

  # Or get an earlier version:
  my %node = $wiki->retrieve_node( name    => "HomePage",
                                   version => 2,
                                  );
  print $node{content};

In scalar context, returns the current (raw Wiki language) contents of the specified node. In list context, returns a hash containing the contents of the node plus additional data:

last_modified
version
checksum
metadata - a reference to a hash containing any caller-supplied metadata sent along the last time the node was written

The node parameter is mandatory. The version parameter is optional and defaults to the newest version. If the node hasn't been created yet, it is considered to exist but be empty (this behaviour might change).

Note on metadata - each hash value is returned as an array ref, even if that type of metadata only has one value.

moderate_node
  my $ok = $wiki->moderate_node(name => $node, version => $version);

Marks the given version of the node as moderated. If this is the highest moderated version, then update the node's contents to hold this version.

set_node_moderation
  my $ok = $wiki->set_node_moderation(name => $node, required => $required);

Sets if a node requires moderation or not. (Moderation is required when $required is true).

When moderation is required, new versions of a node will sit about until they're tagged as moderated, when they will become the new node.

rename_node
  my $ok = $wiki->rename_node(old_name => $old_name, new_name => $new_name, create_new_versions => $create_new_versions );

Renames a node, updating any references to it as required.

Uses the internal_links table to identify the nodes that link to this one, and re-writes any wiki links in these to point to the new name. If required, it can mark these updates to other pages as a new version.

verify_checksum
  my $ok = $wiki->verify_checksum($node, $checksum);

Sees whether your checksum is current for the given node. Returns true if so, false if not.

NOTE: Be aware that when called directly and without locking, this might not be accurate, since there is a small window between the checking and the returning where the node might be changed, so don't rely on it for safe commits; use write_node for that. It can however be useful when previewing edits, for example.

list_backlinks
  # List all nodes that link to the Home Page.
  my @links = $wiki->list_backlinks( node => "Home Page" );
list_dangling_links
  # List all nodes that have been linked to from other nodes but don't
  # yet exist.
  my @links = $wiki->list_dangling_links;

Each node is returned once only, regardless of how many other nodes link to it.

list_all_nodes
  my @nodes = $wiki->list_all_nodes;

Returns a list containing the name of every existing node. The list won't be in any kind of order; do any sorting in your calling script.

list_nodes_by_metadata
  # All documentation nodes.
  my @nodes = $wiki->list_nodes_by_metadata(
      metadata_type  => "category",
      metadata_value => "documentation",
      ignore_case    => 1,   # optional but recommended (see below)
  );

  # All pubs in Hammersmith.
  my @pubs = $wiki->list_nodes_by_metadata(
      metadata_type  => "category",
      metadata_value => "Pub",
  );
  my @hsm  = $wiki->list_nodes_by_metadata(
      metadata_type  => "category",
      metadata_value  => "Hammersmith",
  );
  my @results = my_l33t_method_for_ANDing_arrays( \@pubs, \@hsm );

Returns a list containing the name of every node whose caller-supplied metadata matches the criteria given in the parameters.

By default, the case-sensitivity of both metadata_type and metadata_value depends on your database - if it will return rows with an attribute value of "Pubs" when you asked for "pubs", or not. If you supply a true value to the ignore_case parameter, then you can be sure of its being case-insensitive. This is recommended.

If you don't supply any criteria then you'll get an empty list.

This is a really really really simple way of finding things; if you want to be more complicated then you'll need to call the method multiple times and combine the results yourself, or write a plugin.

list_nodes_by_missing_metadata Returns nodes where either the metadata doesn't exist, or is blank

Unlike list_nodes_by_metadata(), the metadata value is optional (the metadata type is required).

  # All nodes missing documentation
  my @nodes = $store->list_nodes_by_missing_metadata(
      metadata_type  => "category",
      metadata_value => "documentation",
      ignore_case    => 1,   # optional but recommended (see below)
  );

  # All nodes which don't have a latitude defined
  my @nodes = $store->list_nodes_by_missing_metadata(
      metadata_type  => "latitude"
  );
list_recent_changes

This is documented in Wiki::Toolkit::Store::Database; see there for parameters and return values. All parameters are passed through directly to the store object, so, for example,

  my @nodes = $wiki->list_recent_changes( days => 7 );

does exactly the same thing as

  my @nodes = $wiki->store->list_recent_changes( days => 7 );
list_unmoderated_nodes
  my @nodes = $wiki->list_unmoderated_nodes();
  my @nodes = $wiki->list_unmoderated_nodes(
                                                only_where_latest => 1
                                            );

  $nodes[0]->{'name'}              # The name of the node
  $nodes[0]->{'node_id'}           # The id of the node
  $nodes[0]->{'version'}           # The version in need of moderation
  $nodes[0]->{'moderated_version'} # The newest moderated version

  Fetches details of all the node versions that require moderation (id,
   name, version, and latest moderated version).

  If only_where_latest is set, then only the latest version of nodes where 
   the latest version needs moderating are returned.
  Otherwise, all node versions (including old ones, and possibly multiple
   per node) are returned.
list_node_all_versions
  my @versions = $wiki->list_node_all_versions("HomePage");

  my @versions = $wiki->list_node_all_versions(
                                                name => 'HomePage',
                                                with_content => 1,
                                                with_metadata => 0
                 );

Returns all the versions of a node, optionally including the content and metadata, as an array of hashes (newest versions first).

list_last_version_before List the last version of every node before a given date. If no version existed before that date, will return undef for version. Returns a hash of id, name, version and date
    my @nv = $wiki->list_last_version_before('2007-01-02 10:34:11')
    foreach my $data (@nv) {
        
    }
node_exists
  my $ok = $wiki->node_exists( "Wombat Defenestration" );

  # or ignore case - optional but recommended
  my $ok = $wiki->node_exists(
                               name        => "monkey brains",
                               ignore_case => 1,
                             );  

Returns true if the node has ever been created (even if it is currently empty), and false otherwise.

By default, the case-sensitivity of node_exists depends on your store backend. If you supply a true value to the ignore_case parameter, then you can be sure of its being case-insensitive. This is recommended.

node_required_moderation
  my $needs = $wiki->node_required_moderation( "Wombat Defenestration" );

Returns true if the node exists and requires moderation, and false otherwise.

delete_node
  $wiki->delete_node( name => "Home Page", version => 15 );

version is optional. If it is supplied then only that version of the node will be deleted. Otherwise the node and all its history will be completely deleted.

Doesn't do any locking though - to fix? You probably don't want to let anyone except Wiki admins call this. You may not want to use it at all.

Croaks on error, silently does nothing if the node or version doesn't exist, returns true if no error.

search_nodes
  # Find all the nodes which contain the word 'expert'.
  my %results = $wiki->search_nodes('expert');

Returns a (possibly empty) hash whose keys are the node names and whose values are the scores in some kind of relevance-scoring system I haven't entirely come up with yet. For OR searches, this could initially be the number of terms that appear in the node, perhaps.

Defaults to AND searches (if $and_or is not supplied, or is anything other than OR or or).

Searches are case-insensitive.

Croaks if you haven't defined a search backend.

supports_phrase_searches
  if ( $wiki->supports_phrase_searches ) {
      return $wiki->search_nodes( '"fox in socks"' );
  }

Returns true if your chosen search backend supports phrase searching, and false otherwise.

supports_fuzzy_searches
  if ( $wiki->supports_fuzzy_searches ) {
      return $wiki->fuzzy_title_match( 'Kings Cross, St Pancreas' );
  }

Returns true if your chosen search backend supports fuzzy title searching, and false otherwise.

fuzzy_title_match

NOTE: This section of the documentation assumes you are using a search engine which supports fuzzy matching. (See above.) The Wiki::Toolkit::Search::DBIxFTS backend in particular does not.

  $wiki->write_node( "King's Cross St Pancras", "A station." );
  my %matches = $wiki->fuzzy_title_match( "Kings Cross St. Pancras" );

Returns a (possibly empty) hash whose keys are the node names and whose values are the scores in some kind of relevance-scoring system I haven't entirely come up with yet.

Note that even if an exact match is found, any other similar enough matches will also be returned. However, any exact match is guaranteed to have the highest relevance score.

The matching is done against "canonicalised" forms of the search string and the node titles in the database: stripping vowels, repeated letters and non-word characters, and lowercasing.

Croaks if you haven't defined a search backend.

register_plugin
  my $plugin = Wiki::Toolkit::Plugin::Foo->new;
  $wiki->register_plugin( plugin => $plugin );

Registers the plugin with the wiki as one that needs to be informed when we write a node.

If the plugin isa Wiki::Toolkit::Plugin, calls the methods set up by that parent class to let it know about the backend store, search and formatter objects.

Finally, calls the plugin class's on_register method, which should be used to check tables are set up etc. Note that because of the order these things are done in, on_register for Wiki::Toolkit::Plugin subclasses can use the datastore, indexer and formatter methods as it needs to.

get_registered_plugins
  my @plugins = $wiki->get_registered_plugins;

Returns an array of plugin objects.

write_node
  my $written = $wiki->write_node($node, $content, $checksum, \%metadata, $requires_moderation);
  if ($written) {
      display_node($node);
  } else {
      handle_conflict();
  }

Writes the specified content into the specified node in the backend storage; and indexes/reindexes the node in the search indexes (if a search is set up); calls post_write on any registered plugins.

Note that you can blank out a node without deleting it by passing the empty string as $content, if you want to.

If you expect the node to already exist, you must supply a checksum, and the node is write-locked until either your checksum has been proved old, or your checksum has been accepted and your change committed. If no checksum is supplied, and the node is found to already exist and be nonempty, a conflict will be raised.

The first two parameters are mandatory, the others optional. If you want to supply metadata but have no checksum (for a newly-created node), supply a checksum of undef.

The final parameter, $requires_moderation (which defaults to false), is ignored except on new nodes. For existing nodes, use $wiki->toggle_node_moderation to change the node moderation flag.

Returns the version of the updated node on success, 0 on conflict, croaks on error.

Note on the metadata hashref: Any data in here that you wish to access directly later must be a key-value pair in which the value is either a scalar or a reference to an array of scalars. For example:

  $wiki->write_node( "Calthorpe Arms", "nice pub", $checksum,
                     { category => [ "Pubs", "Bloomsbury" ],
                       postcode => "WC1X 8JR" } );

  # and later

  my @nodes = $wiki->list_nodes_by_metadata(
      metadata_type  => "category",
      metadata_value => "Pubs"             );

For more advanced usage (passing data through to registered plugins) you may if you wish pass key-value pairs in which the value is a hashref or an array of hashrefs. The data in the hashrefs will not be stored as metadata; it will be checksummed and the checksum will be stored instead. Such data can only be accessed via plugins.

format
  my $cooked = $wiki->format($raw, $metadata);

Passed straight through to your chosen formatter object. You do not have to supply the $metadata hashref, but if your formatter allows node metadata to affect the rendering of the node then you will want to.

store
  my $store  = $wiki->store;
  my $dbname = eval { $wiki->store->dbname; }
    or warn "Not a DB backend";

Returns the storage backend object.

search_obj
  my $search_obj = $wiki->search_obj;

Returns the search backend object.

formatter
  my $formatter = $wiki->formatter;

Returns the formatter backend object.

SEE ALSO ^

For a very quick Wiki startup without any of that icky programming stuff, see Tom Insam's Wiki::Toolkit::Kwiki, an instant wiki based on Wiki::Toolkit.

Or for the specialised application of a wiki about a city, see the OpenGuides distribution.

Wiki::Toolkit allows you to use different formatting modules. Text::WikiFormat might be useful for anyone wanting to write a custom formatter. Existing formatters include:

There's currently a choice of three storage backends - all database-backed.

A search backend is optional:

Standalone plugins can also be written - currently they should only read from the backend storage, but write access guidelines are coming soon. Plugins written so far and available from CPAN:

If writing a plugin you might want an easy way to run tests for it on all possible backends:

Other ways to implement Wikis in Perl include:

AUTHOR ^

Kake Pugh (kake@earth.li) and the Wiki::Toolkit team (including Nick Burch and Dominic Hargreaves)

SUPPORT ^

Questions should go to cgi-wiki-dev@earth.li.

COPYRIGHT ^

     Copyright (C) 2002-2004 Kake Pugh.  All Rights Reserved.
     Copyright (C) 2006-2012 the Wiki::Toolkit team. All Rights Reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

FEEDBACK ^

The developer web site and bug tracker is at http://www.wiki-toolkit.org/ - please file bugs there as appropriate.

You could also subscribe to the dev list at http://www.earth.li/cgi-bin/mailman/listinfo/cgi-wiki-dev

BUGS ^

Versions between 0.75 and 0.79 inclusive contain a bug which prevents Recent Changes routines from working correctly if minor changes are excluded <http://www.wiki-toolkit.org/ticket/41>. You may wish to avoid upgrading to this version until it is fixed if this is important to you; the fix is however not trivial so noone has been able to step up yet.

Other minor bugs are documented at <http://www.wiki-toolkit.org/report>

CREDITS ^

Various London.pm types helped out with code review, encouragement, JFDI, style advice, code snippets, module recommendations, and so on; far too many to name individually, but particularly Richard Clamp, Tony Fisher, Mark Fowler, and Chris Ball.

blair christensen sent patches and gave me some good ideas. chromatic continues to patiently apply my patches to Text::WikiFormat and help me get it working in just the way I need. Paul Makepeace helped me add support for connecting to non-local databases. Shevek has been prodding me a lot lately. The OpenGuides team keep me well-supplied with encouragement and bug reports.

Nick Burch has been leading the way with development leading up to the release under the Wiki::Toolkit name.

GRATUITOUS PLUG ^

I'm only obsessed with Wikis because of the Open Guide to London -- http://openguides.org/london/

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