Pod::Simple::Search(3)User Contributed Perl DocumentatioPod::Simple::Search(3)
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 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 AT perl.org mail list. Send an empty email to
pod-people-subscribe AT perl.org to subscribe.
This module is managed in an open GitHub repository,
<https://github.com/theory/pod-simple/>;. Feel free to fork and
contribute, or to clone <git://github.com/theory/pod-simple.git>; and
send patches!
Patches against Pod::Simple are welcome. Please send bug reports to
<bug-pod-simple AT rt.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 AT 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:
o Allison Randal "allison AT perl.org"
o Hans Dieter Pearcey "hdp AT cpan.org"
o David E. Wheeler "dwheeler AT cpan.org"
perl v5.16.3 2013-05-03 Pod::Simple::Search(3)
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