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1 | use Config; |
2 | use File::Basename qw(&basename &dirname); |
3 | use File::Spec; |
4 | use Cwd; |
5 | |
6 | my $origdir = cwd; |
7 | chdir dirname($0); |
8 | my $file = basename($0, '.PL'); |
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9 | $file =~ s!_(pm)$!.$1!i; |
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10 | |
11 | my $Config_archname = defined($Config{'archname'}) ? $Config{'archname'} : ''; |
12 | my $Config_ver = defined($Config{'version'}) ? $Config{'version'} : ''; |
13 | my @Config_inc_version_list = defined($Config{'inc_version_list'}) ? |
14 | reverse split / /, $Config{'inc_version_list'} : (); |
15 | |
16 | open OUT,">$file" or die "Can't create $file: $!"; |
17 | |
18 | print "Extracting $file (with variable substitutions)\n"; |
19 | |
20 | # In this section, perl variables will be expanded during extraction. |
21 | # You can use $Config{...} to use Configure variables. |
22 | |
23 | print OUT <<"!GROK!THIS!"; |
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24 | package lib; |
25 | |
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26 | use 5.005_64; |
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27 | |
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28 | my \$archname = "$Config_archname"; |
29 | my \$ver = "$Config_ver"; |
30 | my \@inc_version_list = qw(@Config_inc_version_list); |
31 | |
32 | !GROK!THIS! |
33 | print OUT <<'!NO!SUBS!'; |
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34 | |
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35 | our @ORIG_INC = @INC; # take a handy copy of 'original' value |
36 | our $VERSION = '0.5564'; |
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37 | |
38 | sub import { |
39 | shift; |
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40 | |
41 | my %names; |
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42 | foreach (reverse @_) { |
016609bc |
43 | if ($_ eq '') { |
af3dad46 |
44 | require Carp; |
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45 | Carp::carp("Empty compile time value given to use lib"); |
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46 | } |
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47 | if (-e && ! -d _) { |
48 | require Carp; |
49 | Carp::carp("Parameter to use lib must be directory, not file"); |
50 | } |
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51 | unshift(@INC, $_); |
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52 | # Add any previous version directories we found at configure time |
53 | foreach my $incver (@inc_version_list) |
54 | { |
55 | unshift(@INC, "$_/$incver") if -d "$_/$incver"; |
56 | } |
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57 | # Put a corresponding archlib directory infront of $_ if it |
58 | # looks like $_ has an archlib directory below it. |
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59 | unshift(@INC, "$_/$ver") if -d "$_/$ver"; |
60 | unshift(@INC, "$_/$ver/$archname") if -d "$_/$ver/$archname"; |
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61 | } |
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62 | |
63 | # remove trailing duplicates |
64 | @INC = grep { ++$names{$_} == 1 } @INC; |
65 | return; |
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66 | } |
67 | |
68 | |
69 | sub unimport { |
70 | shift; |
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71 | |
72 | my %names; |
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73 | foreach (@_) { |
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74 | ++$names{$_}; |
75 | ++$names{"$_/$archname"} if -d "$_/$archname/auto"; |
76 | } |
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77 | |
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78 | # Remove ALL instances of each named directory. |
79 | @INC = grep { !exists $names{$_} } @INC; |
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80 | return; |
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81 | } |
82 | |
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83 | 1; |
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84 | __END__ |
85 | |
86 | =head1 NAME |
87 | |
88 | lib - manipulate @INC at compile time |
89 | |
90 | =head1 SYNOPSIS |
91 | |
92 | use lib LIST; |
93 | |
94 | no lib LIST; |
95 | |
96 | =head1 DESCRIPTION |
97 | |
98 | This is a small simple module which simplifies the manipulation of @INC |
99 | at compile time. |
100 | |
101 | It is typically used to add extra directories to perl's search path so |
102 | that later C<use> or C<require> statements will find modules which are |
103 | not located on perl's default search path. |
104 | |
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105 | =head2 Adding directories to @INC |
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106 | |
107 | The parameters to C<use lib> are added to the start of the perl search |
108 | path. Saying |
109 | |
110 | use lib LIST; |
111 | |
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112 | is I<almost> the same as saying |
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113 | |
114 | BEGIN { unshift(@INC, LIST) } |
115 | |
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116 | For each directory in LIST (called $dir here) the lib module also |
117 | checks to see if a directory called $dir/$archname/auto exists. |
118 | If so the $dir/$archname directory is assumed to be a corresponding |
119 | architecture specific directory and is added to @INC in front of $dir. |
120 | |
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121 | To avoid memory leaks, all trailing duplicate entries in @INC are |
122 | removed. |
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123 | |
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124 | =head2 Deleting directories from @INC |
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125 | |
126 | You should normally only add directories to @INC. If you need to |
127 | delete directories from @INC take care to only delete those which you |
128 | added yourself or which you are certain are not needed by other modules |
129 | in your script. Other modules may have added directories which they |
130 | need for correct operation. |
131 | |
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132 | The C<no lib> statement deletes all instances of each named directory |
133 | from @INC. |
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134 | |
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135 | For each directory in LIST (called $dir here) the lib module also |
136 | checks to see if a directory called $dir/$archname/auto exists. |
137 | If so the $dir/$archname directory is assumed to be a corresponding |
138 | architecture specific directory and is also deleted from @INC. |
139 | |
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140 | =head2 Restoring original @INC |
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141 | |
142 | When the lib module is first loaded it records the current value of @INC |
143 | in an array C<@lib::ORIG_INC>. To restore @INC to that value you |
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144 | can say |
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145 | |
146 | @INC = @lib::ORIG_INC; |
147 | |
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148 | |
149 | =head1 SEE ALSO |
150 | |
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151 | FindBin - optional module which deals with paths relative to the source file. |
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152 | |
153 | =head1 AUTHOR |
154 | |
155 | Tim Bunce, 2nd June 1995. |
156 | |
157 | =cut |
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158 | !NO!SUBS! |
159 | |
160 | close OUT or die "Can't close $file: $!"; |
161 | chdir $origdir; |