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MooX::Cmd - Giving an easy Moo style way to make command organized CLI apps
Contents
Description
Eases the writing of command line utilities, accepting commands and subcommands and so on. These commands
can form a tree, which is mirrored in the package structure. On invocation each command along the path
through the tree (starting from the toplevel command through to the most specific one) is instanciated.
Each command needs to have an "execute" function, accepting three parameters:
"self"
A reference to the specific MooX::Cmd object that is executing.
"args"
An ArrayRef of arguments passed to "self". This only encompasses arguments of the most specific
(read: right-most) command.
"chain"
An ArrayRef of "MooX::Cmd"s along the tree path, as specified on the command line.
Notethatonlytheexecutefunctionofthemostspecificcommandisexecuted.MooX::CmdAttributes
Each command has some attributes set by MooX::Cmd during initialization:
"command_chain"
Same as "chain" argument to "execute".
"command_name"
TODO
"command_commands"
TODO
"command_args"
TODO
"command_base"
TODO
ExamplesASingleToplevelCommand
#!/usr/bin/env perl
package MyApp;
use Moo;
use MooX::Cmd;
sub execute {
my ($self,$args,$chain) = @_;
printf("%s.execute(\$self,[%s],[%s])\n",
ref($self), # which command is executing?
join(", ", @$args ), # what where the arguments?
join(", ", map { ref } @$chain) # what's in the command chain?
);
}
package main;
MyApp->new_with_cmd();
Some sample invocations:
$ ./MyApp.pl
MyApp.execute($self,[],[MyApp])
$./MyApp.pl --opt1
MyApp.execute($self,[--opt1],[MyApp])
$ ./MyApp.pl --opt1 arg
MyApp.execute($self,[--opt1, arg],[MyApp])
ToplevelCommandwithSubcommand
#!/usr/bin/env perl
# let's define a base class containing our generic execute
# function to save some typing...
package CmdBase;
use Moo;
sub execute {
my ($self,$args,$chain) = @_;
printf("%s.execute(\$self,[%s],[%s])\n",
ref($self),
join(", ", @$args ),
join(", ", map { ref } @$chain)
);
}
package MyApp;
# toplevel command/app
use Moo;
use MooX::Cmd;
extends 'CmdBase';
package MyApp::Cmd::frobnicate;
# can be called via ./MyApp.pl frobnicate
use Moo;
use MooX::Cmd;
extends 'CmdBase';
package main;
MyApp->new_with_cmd();
And some sample invocations:
$ ./MyApp.pl frobnicate
MyApp::Cmd::frobnicate.execute($self,[],[MyApp, MyApp::Cmd::frobnicate])
As you can see the chain contains our toplevel command object and then the specififc one.
$ ./MyApp.pl frobnicate arg1
MyApp::Cmd::frobnicate.execute($self,[arg1],[MyApp, MyApp::Cmd::frobnicate])
Arguments are passed via the "args" parameter.
$ ./MyApp.pl some --stuff frobnicate arg1
MyApp::Cmd::frobnicate.execute($self,[arg1],[MyApp, MyApp::Cmd::frobnicate])
Arguments to commands higher in the tree get ignored if they don't match a command.
AccessToplevelAttributesviaChain
#!/usr/bin/env perl
package CmdBase;
use Moo;
sub execute {
my ($self,$args,$chain) = @_;
printf("%s.execute(\$self,[%s],[%s])\n",
ref($self),
join(", ", @$args ),
join(", ", map { ref } @$chain)
);
}
package MyApp;
use Moo;
use MooX::Cmd;
extends 'CmdBase';
has somevar => ( is => 'ro', default => 'someval' );
package MyApp::Cmd::frobnicate;
use Moo;
use MooX::Cmd;
extends 'CmdBase';
around execute => sub {
my ($orig,$self,$args,$chain) = @_;
$self->$orig($args,$chain);
# we can access toplevel attributes via the chain...
printf("MyApp->somevar = '%s'\n", $chain->[0]->somevar);
};
package main;
MyApp->new_with_cmd();
A sample invocation
$ ./MyApp.pl some --stuff frobnicate arg1
MyApp::Cmd::frobnicate.execute($self,[arg1],[MyApp, MyApp::Cmd::frobnicate])
MyApp->somevar = someval
MooX::Optionsintegration
You can integrate MooX::Options simply by using it and declaring some options, like so:
#!/usr/bin/env perl
package MyApp;
use Moo;
use MooX::Cmd;
use MooX::Options;
option debug => ( is => 'ro' );
sub execute {
my ($self,$args,$chain) = @_;
print "debugging enabled!\n" if $self->{debug};
}
package main;
MyApp->new_with_cmd();
A sample invocation
$ ./MyApp-Options.pl --debug
debugging enabled!
Note,thateachcommandandsubcommandhasitsownoptions., so options are parsed for the specific
context and used for the instantiation:
$ ./MyApp.pl --argformyapp command --argformyappcmdcommand ...
License And Copyright
Copyright 2012-2013 Torsten Raudssus, Copyright 2013-2017 Jens Rehsack.
This program is free software; you can redistribute it and/or modify it under the terms of either: the
GNU General Public License as published by the Free Software Foundation; or the Artistic License.
See <http://dev.perl.org/licenses/> for more information.
perl v5.36.0 2022-11-19 MooX::Cmd(3pm)
Name
MooX::Cmd - Giving an easy Moo style way to make command organized CLI apps
Support
Repository
http://github.com/Getty/p5-moox-cmd
Pull request and additional contributors are welcome
Issue Tracker
http://github.com/Getty/p5-moox-cmd/issueshttp://rt.cpan.org/NoAuth/Bugs.html?Dist=MooX-Cmd
bug-moox-cmd at rt.cpan.org
Synopsis
package MyApp;
use Moo;
use MooX::Cmd;
sub execute {
my ( $self, $args_ref, $chain_ref ) = @_;
my @extra_argv = @{$args_ref};
my @chain = @{$chain_ref} # in this case only ( $myapp )
# where $myapp == $self
}
1;
package MyApp::Cmd::Command;
# for "myapp command"
use Moo;
use MooX::Cmd;
# gets executed on "myapp command" but not on "myapp command command"
# there MyApp::Cmd::Command still gets instantiated and for the chain
sub execute {
my ( $self, $args_ref, $chain_ref ) = @_;
my @chain = @{$chain_ref} # in this case ( $myapp, $myapp_cmd_command )
# where $myapp_cmd_command == $self
}
1;
package MyApp::Cmd::Command::Cmd::Command;
# for "myapp command command"
use Moo;
use MooX::Cmd;
# gets executed on "myapp command command" and will not get instantiated
# on "myapp command" cause it doesnt appear in the chain there
sub execute {
my ( $self, $args_ref, $chain_ref ) = @_;
my @chain = @{$chain_ref} # in this case ( $myapp, $myapp_cmd_command,
# $myapp_cmd_command_cmd_command )
# where $myapp_cmd_command_cmd_command == $self
}
package MyZapp;
use Moo;
use MooX::Cmd execute_from_new => 0;
sub execute {
my ( $self ) = @_;
my @extra_argv = @{$self->command_args};
my @chain = @{$self->command_chain} # in this case only ( $myzapp )
# where $myzapp == $self
}
1;
package MyZapp::Cmd::Command;
# for "myapp command"
use Moo;
use MooX::Cmd execute_from_new => 0;
# gets executed on "myapp command" but not on "myapp command command"
# there MyApp::Cmd::Command still gets instantiated and for the chain
sub execute {
my ( $self ) = @_;
my @extra_argv = @{$self->command_args};
my @chain = @{$self->command_chain} # in this case ( $myzapp, $myzapp_cmd_command )
# where $myzapp_cmd_command == $self
}
1;
package main;
use MyApp;
MyZapp->new_with_cmd->execute();
MyApp->new_with_cmd;
1;
Thanks
Lukas Mai (mauke), Toby Inkster (tobyink)
Gave some helpful advice for solving difficult issues
Celogeek San
Integration into MooX::Options for better help messages and suit team play
Torsten Raudssus (Getty)
did the initial work and brought it to CPAN
PNG Icons
Emojis