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Re^2: Instance of 'use lib' won't accept relative path

by Lady_Aleena (Curate)
on Aug 22, 2020 at 11:57 UTC ( #11120990=note: print w/replies, xml ) Need Help??


in reply to Re: Instance of 'use lib' won't accept relative path
in thread Instance of 'use lib' won't accept relative path

Is that the actual usage, or does something go in place of the ..? In my case, the script is in $HOME/bin and the modules are in $HOME/bin/flies/lib. How would that change the usage, if there are any changes?

My OS is Debian 10 (Buster); my perl versions are 5.28.1 local and 5.16.3 or 5.30.0 on web host depending on the shebang.

No matter how hysterical I get, my problems are not time sensitive. So, relax, have a cookie, and a very nice day!
Lady Aleena

Replies are listed 'Best First'.
Re^3: Instance of 'use lib' won't accept relative path
by haj (Curate) on Aug 22, 2020 at 12:34 UTC

    The usage from the SYNOPSIS is when you have a bin and lib sitting next to each other, e.g. in a typical CPAN distribution. In your case, that would be:

    use FindBin qw($Bin); use lib "$Bin/flies/lib";

    $Bin is the directory where your Perl script started. Have a look at the edge cases in FindBin whether you need FindBin::again or $FindBin::RealBin, but I guess it will already work as given. I apologize for having used a misleading CPAN link in my first post: FindBin is in Perl core.

      My brain took a vacation, I read the description several times and didn't get it. Also, both links have the same description, so that is okay. Thank you for the clarity. Have a nice day!

      My OS is Debian 10 (Buster); my perl versions are 5.28.1 local and 5.16.3 or 5.30.0 on web host depending on the shebang.

      No matter how hysterical I get, my problems are not time sensitive. So, relax, have a cookie, and a very nice day!
      Lady Aleena
        FindBin allows you to retain the flexibility of the relatives paths, with the additional benefits of absolute paths. FindBin simply figures out the precise location of the script and allows you to do things like use lib during run time. Managing PERL5LIB can be cumbersome, particular if you are distributing a Perl program that can be put anywhere on someone's system. FindBin allows you to assume the location of libraries with respect to the Binary (your script). This allows you to reason about them absolutely with the flexibility of not knowing where your script is located. What's the alternative? Doing what you've done, setting PERL5LIB explicitly. FindBin would allow you to never have to set this explicitly again (or if you were distributing your code, make your users set PERL5LIB).
        use FindBin; use lib "$FindBin::Bin/../lib";

        This might make sense if you consider the standard layout of some code:

        /path/to/my/bin/myscript.pl /path/to/my/lib/Awesome.pm

        In that case,

        use FindBin; use lib "$FindBin::Bin/../lib";

        Is equivalent to:

        use FindBin; use lib "/path/to/my/bin/../lib";

        Or effectively,

        use FindBin; use lib "/path/to/my/lib";

        This might also make more sense and seem more useful when you also are calling myscript.pl by virtual of /path/to/my/bin being in your PATH.

Re^3: Instance of 'use lib' won't accept relative path
by karlgoethebier (Abbot) on Aug 22, 2020 at 13:27 UTC

    BTW, probably you should rethink your layout. A lib shouldn’t be under $HOME/bin/. A better place might be $HOME/lib/. Like /usr/local/bin and /usr/local/lib/. Alternatively you could put the whole stuff under /opt. See also. Best regards, Karl

    «The Crux of the Biscuit is the Apostrophe»

    perl -MCrypt::CBC -E 'say Crypt::CBC->new(-key=>'kgb',-cipher=>"Blowfish")->decrypt_hex($ENV{KARL});'Help

      I used my layout for years, so it is what I'm used to doing. With most of my writing being for my site, I've kept things under one "roof". One of the bigger changes was getting my site work out of my Documents directory, finally, and shedding some of the last vestiges of my time using Windows.

      ../site ../site/files ../site/files/audio ../site/files/css ../site/files/data ../site/files/images ../site/files/lib

      So, I'd been using ../files/lib (when under Documents/www and now just site) as the place where all the modules I wrote went, if they were for my site or not. However, recently I decided to move on from that structure a little bit. So, when I moved the few that really don't belong with my site, I moved them to where the scripts that did use them lived, in this case bin. So now I have...

      ../bin ../bin/files/data ../bin/files/lib

      For me, it makes it easier to work on scripts if their helpers were in the same directory as the script. Maybe one day I will get things together, but for now, this is the way I roll.

      My OS is Debian 10 (Buster); my perl versions are 5.28.1 local and 5.16.3 or 5.30.0 on web host depending on the shebang.

      No matter how hysterical I get, my problems are not time sensitive. So, relax, have a cookie, and a very nice day!
      Lady Aleena

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