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Pod::Simple::Search(3pm)              Perl Programmers Reference Guide              Pod::Simple::Search(3pm)



NAME
       Pod::Simple::Search - find POD documents in directory trees

SYNOPSIS
         use Pod::Simple::Search;
         my $name2path = Pod::Simple::Search->new->limit_glob('LWP::*')->survey;
         print "Looky see what I found: ",
           join(' ', sort keys %$name2path), "\n";

         print "LWPUA docs = ",
           Pod::Simple::Search->new->find('LWP::UserAgent') || "?",
           "\n";

DESCRIPTION
       Pod::Simple::Search is a class that you use for running searches for Pod files.  An object of this
       class has several attributes (mostly options for controlling search options), and some methods for
       searching based on those attributes.

       The way to use this class is to make a new object of this class, set any options, and then call one
       of the search options (probably "survey" or "find").  The sections below discuss the syntaxes for
       doing all that.

CONSTRUCTOR
       This class provides the one constructor, called "new".  It takes no parameters:

         use Pod::Simple::Search;
         my $search = Pod::Simple::Search->new;

ACCESSORS
       This class defines several methods for setting (and, occasionally, reading) the contents of an
       object. With two exceptions (discussed at the end of this section), these attributes are just for
       controlling the way searches are carried out.

       Note that each of these return $self when you call them as "$self->whatever(value)".  That's so that
       you can chain together set-attribute calls like this:

         my $name2path =
           Pod::Simple::Search->new
           -> inc(0) -> verbose(1) -> callback(\&blab)
           ->survey(@there);

       ...which works exactly as if you'd done this:

         my $search = Pod::Simple::Search->new;
         $search->inc(0);
         $search->verbose(1);
         $search->callback(\&blab);
         my $name2path = $search->survey(@there);

       $search->inc( true-or-false );
           This attribute, if set to a true value, means that searches should implicitly add perl's @INC
           paths. This automatically considers paths specified in the "PERL5LIB" environment as this is
           prepended to @INC by the Perl interpreter itself.  This attribute's default value is TRUE.  If
           you want to search only specific directories, set $self->inc(0) before calling $inc->survey or
           $inc->find.

       $search->verbose( nonnegative-number );
           This attribute, if set to a nonzero positive value, will make searches output (via "warn") notes
           about what they're doing as they do it.  This option may be useful for debugging a pod-related
           module.  This attribute's default value is zero, meaning that no "warn" messages are produced.
           (Setting verbose to 1 turns on some messages, and setting it to 2 turns on even more messages,
           i.e., makes the following search(es) even more verbose than 1 would make them.)

       $search->limit_glob( some-glob-string );
           This option means that you want to limit the results just to items whose podnames match the given
           glob/wildcard expression. For example, you might limit your search to just "LWP::*", to search
           only for modules starting with "LWP::*" (but not including the module "LWP" itself); or you might
           limit your search to "LW*" to see only modules whose (full) names begin with "LW"; or you might
           search for "*Find*" to search for all modules with "Find" somewhere in their full name. (You can
           also use "?" in a glob expression; so "DB?" will match "DBI" and "DBD".)

       $search->callback( \&some_routine );
           This attribute means that every time this search sees a matching Pod file, it should call this
           callback routine.  The routine is called with two parameters: the current file's filespec, and
           its pod name.  (For example: "("/etc/perljunk/File/Crunk.pm", "File::Crunk")" would be in @_.)

           The callback routine's return value is not used for anything.

           This attribute's default value is false, meaning that no callback is called.

       $search->laborious( true-or-false );
           Unless you set this attribute to a true value, Pod::Search will apply Perl-specific heuristics to
           find the correct module PODs quickly.  This attribute's default value is false.  You won't
           normally need to set this to true.

           Specifically: Turning on this option will disable the heuristics for seeing only files with Perl-like Perllike
           like extensions, omitting subdirectories that are numeric but do not match the current Perl
           interpreter's version ID, suppressing site_perl as a module hierarchy name, etc.

       $search->shadows( true-or-false );
           Unless you set this attribute to a true value, Pod::Simple::Search will consider only the first
           file of a given modulename as it looks thru the specified directories; that is, with this option
           off, if Pod::Simple::Search has seen a "somepathdir/Foo/Bar.pm" already in this search, then it
           won't bother looking at a "somelaterpathdir/Foo/Bar.pm" later on in that search, because that
           file is merely a "shadow". But if you turn on "$self->shadows(1)", then these "shadow" files are
           inspected too, and are noted in the pathname2podname return hash.

           This attribute's default value is false; and normally you won't need to turn it on.

       $search->limit_re( some-regxp );
           Setting this attribute (to a value that's a regexp) means that you want to limit the results just
           to items whose podnames match the given regexp. Normally this option is not needed, and the more
           efficient "limit_glob" attribute is used instead.

       $search->dir_prefix( some-string-value );
           Setting this attribute to a string value means that the searches should begin in the specified
           subdirectory name (like "Pod" or "File::Find", also expressable as "File/Find"). For example, the
           search option "$search->limit_glob("File::Find::R*")" is the same as the combination of the
           search options "$search->limit_re("^File::Find::R") -> dir_prefix("File::Find")".

           Normally you don't need to know about the "dir_prefix" option, but I include it in case it might
           prove useful for someone somewhere.

           (Implementationally, searching with limit_glob ends up setting limit_re and usually dir_prefix.)

       $search->progress( some-progress-object );
           If you set a value for this attribute, the value is expected to be an object (probably of a class
           that you define) that has a "reach" method and a "done" method.  This is meant for reporting
           progress during the search, if you don't want to use a simple callback.

           Normally you don't need to know about the "progress" option, but I include it in case it might
           prove useful for someone somewhere.

           While a search is in progress, the progress object's "reach" and "done" methods are called like
           this:

             # Every time a file is being scanned for pod:
             $progress->reach($count, "Scanning $file");   ++$count;

             # And then at the end of the search:
             $progress->done("Noted $count Pod files total");

           Internally, we often set this to an object of class Pod::Simple::Progress.  That class is
           probably undocumented, but you may wish to look at its source.

       $name2path = $self->name2path;
           This attribute is not a search parameter, but is used to report the result of "survey" method, as
           discussed in the next section.

       $path2name = $self->path2name;
           This attribute is not a search parameter, but is used to report the result of "survey" method, as
           discussed in the next section.

MAIN SEARCH METHODS
       Once you've actually set any options you want (if any), you can go ahead and use the following
       methods to search for Pod files in particular ways.

   "$search->survey( @directories )"
       The method "survey" searches for POD documents in a given set of files and/or directories.  This runs
       the search according to the various options set by the accessors above.  (For example, if the "inc"
       attribute is on, as it is by default, then the perl @INC directories are implicitly added to the list
       of directories (if any) that you specify.)

       The return value of "survey" is two hashes:

       "name2path"
           A hash that maps from each pod-name to the filespec (like "Stuff::Thing" =>
           "/whatever/plib/Stuff/Thing.pm")

       "path2name"
           A hash that maps from each Pod filespec to its pod-name (like "/whatever/plib/Stuff/Thing.pm" =>
           "Stuff::Thing")

       Besides saving these hashes as the hashref attributes "name2path" and "path2name", calling this
       function also returns these hashrefs.  In list context, the return value of "$search->survey" is the
       list "(\%name2path, \%path2name)".  In scalar context, the return value is "\%name2path".  Or you can
       just call this in void context.

       Regardless of calling context, calling "survey" saves its results in its "name2path" and "path2name"
       attributes.

       E.g., when searching in $HOME/perl5lib, the file $HOME/perl5lib/MyModule.pm would get the POD name
       MyModule, whereas $HOME/perl5lib/Myclass/Subclass.pm would be Myclass::Subclass. The name information
       can be used for POD translators.

       Only text files containing at least one valid POD command are found.

       In verbose mode, a warning is printed if shadows are found (i.e., more than one POD file with the
       same POD name is found, e.g. CPAN.pm in different directories).  This usually indicates duplicate
       occurrences of modules in the @INC search path, which is occasionally inadvertent (but is often
       simply a case of a user's path dir having a more recent version than the system's general path dirs
       in general.)

       The options to this argument is a list of either directories that are searched recursively, or files.
       (Usually you wouldn't specify files, but just dirs.)  Or you can just specify an empty-list, as in
       $name2path; with the "inc" option on, as it is by default, teh

       The POD names of files are the plain basenames with any Perl-like extension (.pm, .pl, .pod)
       stripped, and path separators replaced by "::"'s.

       Calling Pod::Simple::Search->search(...) is short for Pod::Simple::Search->new->search(...).  That
       is, a throwaway object with default attribute values is used.

   "$search->simplify_name( $str )"
       The method simplify_name is equivalent to basename, but also strips Perl-like extensions (.pm, .pl,
       .pod) and extensions like .bat, .cmd on Win32 and OS/2, or .com on VMS, respectively.

   "$search->find( $pod )"
   "$search->find( $pod, @search_dirs )"
       Returns the location of a Pod file, given a Pod/module/script name (like "Foo::Bar" or "perlvar" or
       "perldoc"), and an idea of what files/directories to look in.  It searches according to the various
       options set by the accessors above.  (For example, if the "inc" attribute is on, as it is by default,
       then the perl @INC directories are implicitly added to the list of directories (if any) that you
       specify.)

       This returns the full path of the first occurrence to the file.  Package names (eg 'A::B') are
       automatically converted to directory names in the selected directory.  Additionally, '.pm', '.pl' and
       '.pod' are automatically appended to the search as required.  (So, for example, under Unix, "A::B" is
       converted to "somedir/A/B.pm", "somedir/A/B.pod", or "somedir/A/B.pl", as appropriate.)

       If no such Pod file is found, this method returns undef.

       If any of the given search directories contains a pod/ subdirectory, then it is searched.  (That's
       how we manage to find perlfunc, for example, which is usually in pod/perlfunc in most Perl dists.)

       The "verbose" and "inc" attributes influence the behavior of this search; notably, "inc", if true,
       adds @INC and also $Config::Config{'scriptdir'} to the list of directories to search.

       It is common to simply say "$filename = Pod::Simple::Search-> new ->find("perlvar")" so that just the
       @INC (well, and scriptdir) directories are searched.  (This happens because the "inc" attribute is
       true by default.)

       Calling Pod::Simple::Search->find(...) is short for Pod::Simple::Search->new->find(...).  That is, a
       throwaway object with default attribute values is used.

   "$self->contains_pod( $file )"
       Returns true if the supplied filename (not POD module) contains some Pod documentation.  =head1
       SUPPORT

       Questions or discussion about POD and Pod::Simple should be sent to the pod-people@perl.org mail
       list. Send an empty email to pod-people-subscribe@perl.org to subscribe.

       This module is managed in an open GitHub repository, http://github.com/theory/pod-simple/
       <http://github.com/theory/pod-simple/>. Feel free to fork and contribute, or to clone
       git://github.com/theory/pod-simple.git <git://github.com/theory/pod-simple.git> and send patches!

       Patches against Pod::Simple are welcome. Please send bug reports to <bug-pod-simple@rt.cpan.org>.

COPYRIGHT AND DISCLAIMERS
       Copyright (c) 2002 Sean M. Burke.

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

       This program is distributed in the hope that it will be useful, but without any warranty; without
       even the implied warranty of merchantability or fitness for a particular purpose.

AUTHOR
       Pod::Simple was created by Sean M. Burke <sburke@cpan.org> with code borrowed from Marek Rouchal's
       Pod::Find, which in turn heavily borrowed code from Nick Ing-Simmons' "PodToHtml".

       But don't bother him, he's retired.

       Pod::Simple is maintained by:

       •   Allison Randal "allison@perl.org"

       •   Hans Dieter Pearcey "hdp@cpan.org"

       •   David E. Wheeler "dwheeler@cpan.org"



perl v5.16.2                                     2012-10-25                         Pod::Simple::Search(3pm)