YAPC::Tokyo 2019 トーク資料 Slide of my talk about development of command line interface in perl 6. https://yapcjapan.org/2019tokyo/talks.html#/detail/12

1. Perl 6
by risou
at YAPC::Tokyo 2019

2. ▸ risou
▸ ID "risouf"
▸
▸ Perl 6 😎
▸ Perl Ruby Go

3. ▸
▸ Perl 6 CLI
▸ Perl 6
▸ URI
▸
▸ Perl 6
▸ Web

5. Perl 6
▸ Linux
▸
▸ 2018 10 OK
$ wget https://rakudo.perl6.org/downloads/star/rakudo-star-2018.10.tar.gz
$ tar xfz rakudo-star-2018.10.tar.gz
$ cd rakudo-star-2018.10
$ perl Configure.pl --gen-moar --make-install --prefix ~/rakudo

6. Perl 6
▸ MacOS
▸ brew install rakudo-star
▸ homebrew Linux
▸ Windows
▸ msi 2018 10
▸ https://rakudo.perl6.org/downloads/star/rakudo-star-2018.10-x86_64%20(JIT).msi

7. Perl 6
▸ Docker
▸
▸ rakudobrew
▸ https://github.com/tadzik/rakudobrew
▸ p6env
▸ https://github.com/skaji/p6env
$ docker pull rakudo-star
$ docker run -it rakudo-star

8. Command Line Interface

9. Perl 6 MAIN

10. MAIN
▸
#!/usr/bin/env perl6
sub MAIN() {
say "sub MAIN called.";
}

11. MAIN
▸
▸
#!/usr/bin/env perl6
say "Hello Perl World!";

12. MAIN
▸ ……
#!/usr/bin/env perl6
say "Hello Perl World! (before MAIN sub)";
sub MAIN() {
say "Hello Perl 6 World!";
}
say "Hello Perl World! (after MAIN sub)";

13. MAIN
▸
▸
MAIN
$ perl6 hello_world.p6
Hello Perl World! (before MAIN sub)
Hello Perl World! (after MAIN sub)
Hello Perl 6 World!

14. MAIN
▸ MAIN
▸
▸ Usage

15. MAIN
▸
▸ Usage
#!/usr/bin/env perl6
sub MAIN($param) {
say "Hello $param World!";
}
$ perl6 hello_param_world.p6
Usage:
hello_param_world.p6 <param>

16. MAIN
▸
▸ Usage
#!/usr/bin/env perl6
sub MAIN(Int $num) {
say "num: $num";
}
$ perl6 print_num.p6 string
Usage:
print_num.p6 <num>

17. MAIN
▸ multi sub
#!/usr/bin/env perl6
multi sub MAIN(Int $num) {
say "num: $num";
}
multi sub MAIN(Str $str, Int $num) {
say "str: $str";
say "num: $num";
}

18. ▸ MAIN @*ARGS
#!/usr/bin/env perl6
sub MAIN(Str $str, Int $num) {
say "str: $str";
say "num: $num";
}
say @*ARGS.elems;
say @*ARGS.perl;
$ perl6 yapc.p6 YAPC 2019
2
["YAPC", "2019"]
str: YAPC
num: 2019

19. Usage...?
Usage

20. Usage...?
Perl 6 USAGE

21. USAGE
▸
#!/usr/bin/env perl6
sub MAIN(Str $str, Int $num) {
say "str: $str";
say "num: $num";
}
sub USAGE() {
say "sub USAGE called.";
}
$ perl6 usage.p6
sub USAGE called.

22. USAGE
▸
▸
▸ :to
#!/usr/bin/env perl6
sub MAIN(Str $str, Int $num) {
say "str: $str";
say "num: $num";
}
sub USAGE() {
print q:to/END/;
Usage:
heredocs.p6 <str> <num>
please set "str" first.
END
}

23. USAGE
▸ Usage
▸ $*USAGE
#!/usr/bin/env perl6
sub MAIN(Str $str, Int $num) {
say "str: $str";
say "num: $num";
}
sub USAGE() {
say $*USAGE.perl;
}
$ perl6 var_usage.p6
"Usage:n var_usage.p6 <str> <num> "

24. USAGE
▸ Usage
▸
#!/usr/bin/env perl6
#| only 1 parameter
multi sub MAIN(Int $num) {
say "num: $num";
}
#| need 2 parameters, first parameter's type is Str, second is Int
multi sub MAIN(Str $str, Int $num) {
say "str: $str";
say "num: $num";
}

25. USAGE
▸ Usage
▸ MAIN Usage
$ perl6 declarator.p6
Usage:
declarator.p6 <num> -- only 1 parameter
declarator.p6 <str> <num> -- need 2 parameters, first parameter's
type is Str, second is Int

26. ▸ #|
▸ #|
▸ #=
▸ Perl 6 pod
#| only 1 parameter
multi sub MAIN(Int $num) {
say "num: $num";
}

28. ▸ CLI
▸ ……

29. Perl 6
Perl

30. ▸
#!/usr/bin/env perl6
my $fh = open "README.md";
my $contents = $fh.slurp;
$fh.close;
#!/usr/bin/env perl6
my $fh = open "output.txt", :w;
$fh.print: "Hello World!";
$fh.close;

31. ▸ slurp
▸
▸
▸
my $contents = $fh.slurp;
my $contents = slurp "README.md";

32. ▸
▸ $fh.slurp IO::Handle
▸ slurp "filename" IO role
▸ open/close

33. ▸ slurp
▸
▸ spurt
▸ slurp open/close

34. ▸
▸ IO lines
for "README.md".IO.lines -> $line {
say $line;
}
my $fh = open "README.md";
for $fh.lines -> $line {
say $line;
}
$fh.close;

35. ▸ "README.md".IO
▸ .IO
IO::Path
▸ IO::Path.new("README.md")
#!/usr/bin/env perl6
my $fh = open "README.md";
say $fh.perl; # IO::Handle
say $fh.IO.perl; # IO::Path
say "README.md".perl; # Str
say "README.md".IO.perl; # IO::Path

36. IO::Path
▸ path
#!/usr/bin/env perl6
my $readme = "README.md".IO;
say $readme.perl;
say $readme.CWD; # get absolute path
say $readme.path; # get relative path
say $readme.basename; # get file name
say $readme.extension; # get extension
say $readme.dirname; # get directory by relative path
say $readme.e; # exist?
say $readme.d; # directory?
say $readme.f; # file?
say $readme.s; # size

38. ▸ zef
▸ etc...
$ zef search Template
===> Found 78 results
...
$ zef install Template6
$ zef uninstall Template6

39. ▸ zef search ……
▸ Perl 6 Modules
▸ https://modules.perl6.org/

40. ▸ use
#!/usr/bin/env perl6
use Template6;
my $t6 = Template6.new;

42. ▸ %*ENV
#!/usr/bin/env perl6
for %*ENV.keys -> $key {
say "$key: " ~ %*ENV{$key};
}

43. ▸ ……
▸ mi6
▸
▸ YAPC
$ zef install App::Mi6

44. Perl 6
▸ Perl 6
▸ https://perl6intro.com/ja/
▸
▸ https://perl6intro.com
▸ Perl 6 Documentation
▸ https://docs.perl6.org/
▸

46. Perl 6 CLI
▸ Docker
▸ MAIN USAGE
▸ I/O
Perl 6
▸

48. Perl 6
▸ ……
▸ Perl 6
▸
Perl 6

49. Perl 6
▸
▸ "50ms or die." ……

50. .perl
▸ Mu
▸
▸ Data::Dumper
▸ Mu
▸ Perl 6
▸ Java Object

51. Web
▸ ……
▸ YAPC
"p6-Crust"