im::grep(3pm) [debian man page]

IM::Grep(3pm)						   Internet Message Perl modules					     IM::Grep(3pm)

NAME

       IM::Grep - grep mail/news folder

SYNOPSIS

	use IM::Grep;

	$eval_string = &parse_expression($expression, $casefold);

	@message_number_array = &grep_folder($folder_dir, $eval_string, @ranges);

DESCRIPTION

       The IM::Grep module enumerates mail/news messages matched given patterns.

       This modules is provided by IM (Internet Message).

COPYRIGHT

       IM (Internet Message) is copyrighted by IM developing team.  You can redistribute it and/or modify it under the modified BSD license.  See
       the copyright file for more details.

IM151								    2011-05-25							     IM::Grep(3pm)

POE::Filter::Grep(3pm)					User Contributed Perl Documentation				    POE::Filter::Grep(3pm)

NAME

       POE::Filter::Grep - select or remove items based on simple rules

SYNOPSIS

	 #!perl

	 use POE qw(
	   Wheel::FollowTail
	   Filter::Line Filter::Grep Filter::Stackable
	 );

	 POE::Session->create(
	   inline_states => {
	     _start => sub {
	       my $parse_input_as_lines = POE::Filter::Line->new();

	       my $select_sudo_log_lines = POE::Filter::Grep->new(
		 Put => sub { 1 },
		 Get => sub {
		   my $input = shift;
		   return $input =~ /sudo[d+]/i;
		 },
	       );

	       my $filter_stack = POE::Filter::Stackable->new(
		 Filters => [
		   $parse_input_as_lines, # first on get, last on put
		   $select_sudo_log_lines, # first on put, last on get
		 ]
	       );

	       $_[HEAP]{tailor} = POE::Wheel::FollowTail->new(
		 Filename => "/var/log/system.log",
		 InputEvent => "got_log_line",
		 Filter => $filter_stack,
	       );
	     },
	     got_log_line => sub {
	       print "Log: $_[ARG0]
";
	     }
	   }
	 );

	 POE::Kernel->run();
	 exit;

DESCRIPTION

       POE::Filter::Grep selects or removes items based on simple tests.  It may be used to filter input, output, or both.  This filter is named
       and modeled after Perl's built-in grep() function.

       POE::Filter::Grep is designed to be combined with other filters through POE::Filter::Stackable.	In the "SYNOPSIS" example, a filter stack
       is created to parse logs as lines and remove all entries that don't pertain to a sudo process.  (Or if your glass is half full, the stack
       only selects entries that DO mention sudo.)

PUBLIC FILTER METHODS

       In addition to the usual POE::Filter methods, POE::Filter::Grep also supports the following.

   new
       new() constructs a new POE::Filter::Grep object.  It must either be called with a single Code parameter, or both a Put and a Get parameter.
       The values for Code, Put, and Get are code references that, when invoked, return true to select an item or false to reject it.  A Code
       function will be used for both input and output, while Get and Put functions allow input and output to be filtered in different ways.  The
       item in question will be passed as the function's sole parameter.

	 sub reject_bidoofs {
	   my $pokemon = shift;
	   return 1 if $pokemon ne "bidoof";
	   return;
	 }

	 my $gotta_catch_nearly_all = POE::Filter::Grep->new(
	   Code => &reject_bidoofs,
	 );

       Enforce read-only behavior:

	 my $read_only = POE::Filter::Grep->new(
	   Get => sub { 1 },
	   Put => sub { 0 },
	 );

   modify
       modify() changes a POE::Filter::Grep object's behavior at run-time.  It accepts the same parameters as new(), and it replaces the existing
       tests with new ones.

	 # Don't give away our Dialgas.
	 $gotta_catch_nearly_all->modify(
	   Get => sub { 1 },
	   Put => sub { return shift() ne "dialga" },
	 );

SEE ALSO

       POE::Filter for more information about filters in general.

       POE::Filter::Stackable for more details on stacking filters.

BUGS

       None known.

AUTHORS &; COPYRIGHTS
       The Grep filter was contributed by Dieter Pearcey.  Documentation is provided by Rocco Caputo.

       Please see the POE manpage for more information about authors and contributors.

perl v5.14.2							    2012-05-15						    POE::Filter::Grep(3pm)