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    0: # deprecated - pragmatic module to mark a package or a sub as unsupported
    1: 
    2: package deprecated;
    3: 
    4: =head1 NAME
    5: 
    6: deprecated - pragmatic module to mark a package or a sub as unsupported
    7: 
    8: =head1 SYNOPSIS
    9: 
    10:     package OldeCrufte;
    11:     use deprecated qw(do_hack);  # calling OldeCrufte::do_hack() will carp
    12: 
    13:     package OldeCrufte;
    14:     use deprecated;              # using the OldeCrufte module will carp
    15: 
    16: =head1 DESCRIPTION
    17: 
    18: The word 'deprecated' is used to describe something that has lost support
    19: or is otherwise not recommended.  In programming, this usually means that
    20: a newer, faster, safer or more supportable method has replaced an earlier
    21: routine.
    22: 
    23: When added to a package, this pragma will mark the package, or select
    24: subs within it, as being deprecated.  It does not change the behavior of
    25: the subs within the package, except that on the first call of the sub, a
    26: helpful message is printed to the C<STDERR> stream before running.
    27: 
    28: The runtime messages are suppressed if the PERLLIB environment variable
    29: does not contain the words 'home', 'devel', or 'test'.
    30: This way, only developers see these messages when working with
    31: the programs, but normal end-users do not see them.  This
    32: test is easy to customize for other company library
    33: situations.
    34: 
    35: =cut
    36: 
    37: use strict;
    38: 
    39: sub debug
    40: {
    41:     return (defined $ENV{PERLLIB} and
    42: 	    $ENV{PERLLIB} =~ /home|devel|test/i);
    43: }
    44: 
    45: use constant EVAL_CODE => <<'END_CODE';
    46: sub %s::INIT
    47: {
    48:     my $overridden = \&%s;
    49:     *%s =
    50: 	sub
    51: 	{
    52: 	    if (deprecated::debug())
    53: 	    {
    54: 		require Carp;
    55: 		Carp::carp('%s() is deprecated; ' .
    56: 			   'see the documentation for an alternative;');
    57: 	    }
    58: 	    *%s = $overridden;
    59: 	    goto &$overridden;
    60: 	};
    61: }
    62: END_CODE
    63: 
    64: sub import {
    65:     my $class = shift;
    66:     my $pkg = caller;
    67:     if (not @_ and debug())
    68:     {
    69: 	require Carp;
    70: 	Carp::carp("Module $pkg is deprecated; " .
    71: 		   'see the documentation for an alternative;');
    72:     }
    73:     eval join('', map { sprintf(EVAL_CODE, $pkg, ("$pkg\::$_") x 4) } @_);
    74: }
    75: 
    76: 1;
    77: 
    78: __END__
    79: 
    80: =head1 AUTHORS
    81: 
    82: Proposed and tested by Ed Halley <F<ed@halley.cc>>, and draft
    83: implementation by 'Aristotle', as posted on F<http://www.perlmonks.org/>
    84: in 2003.
    85: 
    86: =cut
    

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