mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
139 lines
3.6 KiB
139 lines
3.6 KiB
package lib;
|
|
|
|
use vars qw(@ORIG_INC);
|
|
use Config;
|
|
|
|
my $archname = $Config{'archname'};
|
|
|
|
@ORIG_INC = @INC; # take a handy copy of 'original' value
|
|
|
|
|
|
sub import {
|
|
shift;
|
|
foreach (reverse @_) {
|
|
## Ignore this if not defined.
|
|
next unless defined($_);
|
|
if ($_ eq '') {
|
|
require Carp;
|
|
Carp::carp("Empty compile time value given to use lib");
|
|
# at foo.pl line ...
|
|
}
|
|
if (-e && ! -d _) {
|
|
require Carp;
|
|
Carp::carp("Parameter to use lib must be directory, not file");
|
|
}
|
|
unshift(@INC, $_);
|
|
# Put a corresponding archlib directory infront of $_ if it
|
|
# looks like $_ has an archlib directory below it.
|
|
if (-d "$_/$archname") {
|
|
unshift(@INC, "$_/$archname") if -d "$_/$archname/auto";
|
|
unshift(@INC, "$_/$archname/$]") if -d "$_/$archname/$]/auto";
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
sub unimport {
|
|
shift;
|
|
my $mode = shift if $_[0] =~ m/^:[A-Z]+/;
|
|
|
|
my %names;
|
|
foreach(@_) {
|
|
++$names{$_};
|
|
++$names{"$_/$archname"} if -d "$_/$archname/auto";
|
|
}
|
|
|
|
if ($mode and $mode eq ':ALL') {
|
|
# Remove ALL instances of each named directory.
|
|
@INC = grep { !exists $names{$_} } @INC;
|
|
} else {
|
|
# Remove INITIAL instance(s) of each named directory.
|
|
@INC = grep { --$names{$_} < 0 } @INC;
|
|
}
|
|
}
|
|
|
|
1;
|
|
__END__
|
|
|
|
=head1 NAME
|
|
|
|
lib - manipulate @INC at compile time
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
use lib LIST;
|
|
|
|
no lib LIST;
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
This is a small simple module which simplifies the manipulation of @INC
|
|
at compile time.
|
|
|
|
It is typically used to add extra directories to perl's search path so
|
|
that later C<use> or C<require> statements will find modules which are
|
|
not located on perl's default search path.
|
|
|
|
=head2 ADDING DIRECTORIES TO @INC
|
|
|
|
The parameters to C<use lib> are added to the start of the perl search
|
|
path. Saying
|
|
|
|
use lib LIST;
|
|
|
|
is I<almost> the same as saying
|
|
|
|
BEGIN { unshift(@INC, LIST) }
|
|
|
|
For each directory in LIST (called $dir here) the lib module also
|
|
checks to see if a directory called $dir/$archname/auto exists.
|
|
If so the $dir/$archname directory is assumed to be a corresponding
|
|
architecture specific directory and is added to @INC in front of $dir.
|
|
|
|
If LIST includes both $dir and $dir/$archname then $dir/$archname will
|
|
be added to @INC twice (if $dir/$archname/auto exists).
|
|
|
|
=head2 DELETING DIRECTORIES FROM @INC
|
|
|
|
You should normally only add directories to @INC. If you need to
|
|
delete directories from @INC take care to only delete those which you
|
|
added yourself or which you are certain are not needed by other modules
|
|
in your script. Other modules may have added directories which they
|
|
need for correct operation.
|
|
|
|
By default the C<no lib> statement deletes the I<first> instance of
|
|
each named directory from @INC. To delete multiple instances of the
|
|
same name from @INC you can specify the name multiple times.
|
|
|
|
To delete I<all> instances of I<all> the specified names from @INC you can
|
|
specify ':ALL' as the first parameter of C<no lib>. For example:
|
|
|
|
no lib qw(:ALL .);
|
|
|
|
For each directory in LIST (called $dir here) the lib module also
|
|
checks to see if a directory called $dir/$archname/auto exists.
|
|
If so the $dir/$archname directory is assumed to be a corresponding
|
|
architecture specific directory and is also deleted from @INC.
|
|
|
|
If LIST includes both $dir and $dir/$archname then $dir/$archname will
|
|
be deleted from @INC twice (if $dir/$archname/auto exists).
|
|
|
|
=head2 RESTORING ORIGINAL @INC
|
|
|
|
When the lib module is first loaded it records the current value of @INC
|
|
in an array C<@lib::ORIG_INC>. To restore @INC to that value you
|
|
can say
|
|
|
|
@INC = @lib::ORIG_INC;
|
|
|
|
|
|
=head1 SEE ALSO
|
|
|
|
FindBin - optional module which deals with paths relative to the source file.
|
|
|
|
=head1 AUTHOR
|
|
|
|
Tim Bunce, 2nd June 1995.
|
|
|
|
=cut
|
|
|