NAME

   goto::file - Stop parsing the current file and move on to a different
   one.

DESCRIPTION

   It is rare, but there are times where you want to swap out the
   currently compiling file for a different one. This module does that.
   From the point you use the module perl will be parsing the new file
   instead of the original.

WHY?!

   This was created specifically for Test2::Harness which can preload
   modules and fork to run each test. The problem was that using do to
   execute the test files post-fork was resuling in extra frames in the
   stack trace... in other words there are a lot of tests that assume the
   test file is the bottom of the stack. This happens all the time,
   specially if stack traces need to be verified.

   This module allows Test2::Harness to swap out the main script for the
   new file without adding a stack frame.

SYNOPSIS

   Plain and simple:

       #!/usr/bin/perl

       use goto::file 'some_file.pl';

       die "This will never be seen!";

       __DATA__

       This data will not be seen by <DATA>

   More useful:

       #!/usr/bin/perl

       BEGIN {
           my $file = should_switch_files();

           if ($file) {
               print "about to switch to file '$file'\n";
               require goto::file;
               goto::file->import($file);
           }
       }

       print "Did not go to a file\n";

   Another thing you can do:

       use goto::file [
           'print "Hi!\n";',
           "exit 0",
       ];

       die "Will not get here";

NOTES

   __DATA__ and <DATA>

     This module does its very best to make sure the data you get from
     <DATA> comes from the NEW file, and not the old. At the moment there
     are no known failure cases, but there could be some.

IMPLEMENTATION DETAILS

   This is a source filter. The source filter simply disgards the lines
   from the original file and instead feeds perl lines from the new file.
   There is also a small source injection at the start that sets up <DATA>
   and makes sure line numbers and file name are all correct.

SOURCE

   The source code repository for goto-file can be found at
   http://github.com/exodist/goto-file/.

MAINTAINERS

   Chad Granum <[email protected]>

AUTHORS

   Chad Granum <[email protected]>

COPYRIGHT

   Copyright 2017 Chad Granum <[email protected]>.

   This program is free software; you can redistribute it and/or modify it
   under the same terms as Perl itself.

   See http://dev.perl.org/licenses/