Advanced modulinos

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  • 1. ★ Advanced Modulinos brian d foy The Perl Review YAPC::NA 2012
  • 2. Files that work asprograms and modules at the same time
  • 3. Unit testingCode reüseDistribution
  • 4. # hello.pluse v5.10;say Hello World!;
  • 5. % perl hello.plHello World!
  • 6. STDIN $0 STDOUT@ARGV %ENV exit code
  • 7. Starting
  • 8. use v5.10;run();sub run { say Hello World!; }
  • 9. % perl hello.plHello World!% perl -e require q(hello.pl)Hello World!
  • 10. # Hello.pmuse v5.10;run() unless caller;sub run { say Hello World!; }_ _PACKAGE_ _
  • 11. % perl Hello.pmHello World!% perl -MHello -e 1%
  • 12. package Hello;use v5.10;__PACKAGE__->run unless caller;sub run { say Hello World!; }_ _PACKAGE_ _
  • 13. use Test::More;use Test::Output;use_ok( Hello );stdout_ok( sub { Hello->run() }, "Hello World!n", ... );
  • 14. package Hello;use v5.10;_ _PACKAGE_ _->run unless caller;sub run { my( $self ) = @_; say { $self->fh } Hello World!; }
  • 15. package Hello;use v5.10;...;sub fh { *STDOUT }
  • 16. use Test::More;use_ok( Hello );our $string;{open my $fh, >, $string;*Hello::fh = sub { $fh };}Hello->run;is($string, "Hello World!n");
  • 17. package Hello;use v5.10;...;BEGIN {my $fh = *STDOUT;sub fh { $fh }sub set_fh { $fh = ...;}}
  • 18. use Test::More;use_ok( Hello );open my $fh, >, my $string;Hello->set_fh( $fh );Hello->run;is($string, "Hello World!n");
  • 19. % perl hello.plHello World!% perl hello.pl ChicagoHello World!% perl hello.pl -m RahmHello World!% perl hello.pl < aldermenHello World!
  • 20. Connect the command line to new()% hello.pl -s Houston ? use Hello; new() my $app->new( input => $in_fh, output => $out_fh, message => $message, ); $app->greet;
  • 21. sub run { my( $class, @args ) = @_; my %args = $class->process_args(@args); my $self = $class->new(%args); say { $self->fh } $self->message; }
  • 22. sub process_args { require Getopt::Std; local @ARGV = @_; getopts(oim:, my %opts); $opts{o} //= *STDOUT; $opts{i} //= *STDIN; $opts{m} //= Hello World!; # left over @_? my %args = map { $opts_map{$_} => $opts{$_} } keys %opts; }
  • 23. $app->new( input_fh => $in, output_fh => $out, message => Hello World! );
  • 24. sub new { my( $class, %args ) = @_; my $self = bless {}, $class; foreach ( keys %args ) { # maybe more complicated $self->set( $_, $args{$_} ); } return $self; }
  • 25. Stopping
  • 26. #!perl...;...;...;exit(0);
  • 27. sub run { my( $class, @args ) = @_; my $object = eval { ...; Result->new( code => 0 ); } or $@; exit( $object->code ); }
  • 28. sub some_sub { ...; die Result->new( code => 15 ); ...; }
  • 29. sub run { my( $class, @args ) = @_; my $object = eval { ...; Result->new( code => 0 ); }; exit( $error_object->code ); }
  • 30. Testing
  • 31. run() unless caller;
  • 32. UNITCHECK { if($ENV{TEST_HARNESS}){ __PACKAGE__->run_tests; } elsif( ! caller ) { __PACKAGE__->run; } }
  • 33. Docs
  • 34. UNITCHECK { if($ENV{TEST_HARNESS}){ __PACKAGE__->run_tests; } elsif($ENV{PERLDOC}){ __PACKAGE__->show_docs; } elsif( ! caller ) { __PACKAGE__->run; } }