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Home: Perl Programming Help: Intermediate:
Push paths to @INC array

hacksics
Novice

Dec 25, 2008, 8:53 AM

Post #1 of 9 (672 views)

Push paths to @INC array	Can't Post

Hi everyone,

Is there any way to push a variable to @INC array in perl. I've noted if the full path is given then it accepts but a variable is given then it ignores,

Ex:

Code

push @INC, "/home/user_x/custom_libs"; # working 
 
 
my $LIB_PATH = "/home/user_x/custom_libs"; 
push @INC, $LIB_PATH; # not working

Thanks,

shawnhcorey
Enthusiast

Dec 25, 2008, 9:20 AM

Post #2 of 9 (668 views)

Re: [hacksics] Push paths to @INC array [In reply to]	Can't Post

In Reply To

Hi everyone,

Is there any way to push a variable to @INC array in perl. I've noted if the full path is given then it accepts but a variable is given then it ignores,

Ex:

Code

push @INC, "/home/user_x/custom_libs"; # working 
 
 
my $LIB_PATH = "/home/user_x/custom_libs"; 
push @INC, $LIB_PATH; # not working

Thanks,

See `perldoc lib`.

Code

use lib "/home/user_x/custom_libs";

__END__

I love Perl; it's the only language where you can bless your thingy.

Perl documentation is available at perldoc.perl.org. The list of standard modules and pragmatics is available in perlmodlib.

Get Markup Help. Please note the markup tag of "code".

hacksics
Novice

Dec 25, 2008, 9:27 AM

Post #3 of 9 (667 views)

Re: [shawnhcorey] Push paths to @INC array [In reply to]	Can't Post

Yeah,

Even If I use,

Code

my $LIB_PATH = "/home/user_x/custom_libs"; 
use lib "$LIB_PATH";

It does not get the lib path defined in the variable. Am I missing anything here?

Thanks

shawnhcorey
Enthusiast

Dec 25, 2008, 9:41 AM

Post #4 of 9 (663 views)

Re: [hacksics] Push paths to @INC array [In reply to]	Can't Post

In Reply To

Yeah,

Even If I use,

Code

my $LIB_PATH = "/home/user_x/custom_libs"; 
use lib "$LIB_PATH";

It does not get the lib path defined in the variable. Am I missing anything here?

Thanks

Perl has two phases: compile and run-time. `use` is executed at compile time, variable assignment at run time. You have to get it to assign the value at compile time:

Code

BEGIN { 
  my $LIB_PATH = "/home/user_x/custom_libs";  
  use lib $LIB_PATH; 
}

Note that $LIB_PATH is not accessible outside the block. To have it so:

Code

BEGIN { 
  our $LIB_PATH = "/home/user_x/custom_libs";  
  use lib $LIB_PATH; 
}

hacksics
Novice

Dec 25, 2008, 10:12 AM

Post #5 of 9 (660 views)

Re: [shawnhcorey] Push paths to @INC array [In reply to]	Can't Post

Hi Shawn,

Thank you so much for your quick response. But now it gives me a compile time error. can you please have a look

my code:

Code

BEGIN { 
our $LIBS = "$ENV{'HOME'}"."/Libs"; 
use lib "$LIBS"; 
}

Error returned by perl

Code

Empty compile time value given to use lib at /highway/rmon/home/rtool line 14

Thanks,

hacksics
Novice

Dec 25, 2008, 10:20 AM

Post #6 of 9 (657 views)

Re: [hacksics] Push paths to @INC array [In reply to]	Can't Post

In Reply To

Hi Shawn,

Thank you so much for your quick response. But now it gives me a compile time error. can you please have a look

my code:

Code

BEGIN { 
our $LIBS = "$ENV{'HOME'}"."/Libs"; 
use lib "$LIBS"; 
}

Error returned by perl

Code

Empty compile time value given to use lib at /highway/rmon/home/rtool line 14

Thanks,

But this works without any issue,

Code

BEGIN { 
our $LIBS = "$ENV{'HOME'}"."/Libs"; 
push @INC, $LIBS; 
}

shawnhcorey
Enthusiast

Dec 25, 2008, 10:22 AM

Post #7 of 9 (656 views)

Re: [hacksics] Push paths to @INC array [In reply to]	Can't Post

In Reply To

Hi Shawn,

Thank you so much for your quick response. But now it gives me a compile time error. can you please have a look

my code:

Code

BEGIN { 
our $LIBS = "$ENV{'HOME'}"."/Libs"; 
use lib "$LIBS"; 
}

Error returned by perl

Code

Empty compile time value given to use lib at /highway/rmon/home/rtool line 14

Thanks,

It means $ENV{HOME} is undef. This is what I have in my Perl script template:

Code

use FindBin '$RealBin'; FindBin::again(); 
use lib glob( '~/lib' ), $RealBin;

But that only works in Linux. :)

You could try:

Code

use FindBin '$RealBin'; FindBin::again(); 
use lib glob( '~/Libs' ), $RealBin;

hacksics
Novice

Dec 25, 2008, 10:29 AM

Post #8 of 9 (654 views)

Re: [shawnhcorey] Push paths to @INC array [In reply to]	Can't Post

Code

BEGIN {  
our $LIBS = "$ENV{'HOME'}"."/Libs";  
push @INC, $LIBS;  
}

This works without any error and I'm using solaris. :)

Thank you so much for saving my day :)

KevinR
Veteran

Dec 25, 2008, 10:41 AM

Post #9 of 9 (651 views)

Re: [hacksics] Push paths to @INC array [In reply to]	Can't Post

a little bit better written like so:

Code

BEGIN {   
our $LIBS = "$ENV{'HOME'}/Libs";   
push @INC, $LIBS;   
}

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