1App::Cmd::Command::helpU(s3e)r Contributed Perl DocumentaAtpipo:n:Cmd::Command::help(3)
2
3
4

NAME

6       App::Cmd::Command::help - display a command's help screen
7

VERSION

9       version 0.331
10

DESCRIPTION

12       This command will either list all of the application commands and their
13       abstracts, or display the usage screen for a subcommand with its
14       description.
15

USAGE

17       The help text is generated from three sources:
18
19       ·   The "usage_desc" method
20
21       ·   The "description" method
22
23       ·   The "opt_spec" data structure
24
25       The "usage_desc" method provides the opening usage line, following the
26       specification described in Getopt::Long::Descriptive.  In some cases,
27       the default "usage_desc" in App::Cmd::Command may be sufficient and you
28       will only need to override it to provide additional command line usage
29       information.
30
31       The "opt_spec" data structure is used with Getopt::Long::Descriptive to
32       generate the description of the options.
33
34       Subcommand classes should override the "discription" method to provide
35       additional information that is prepended before the option
36       descriptions.
37
38       For example, consider the following subcommand module:
39
40         package YourApp::Command::initialize;
41
42         # This is the default from App::Cmd::Command
43         sub usage_desc {
44           my ($self) = @_;
45           my $desc = $self->SUPER::usage_desc; # "%c COMMAND %o"
46           return "$desc [DIRECTORY]";
47         }
48
49         sub description {
50           return "The initialize command prepares the application...";
51         }
52
53         sub opt_spec {
54           return (
55             [ "skip-refs|R",  "skip reference checks during init", ],
56             [ "values|v=s@",  "starting values", { default => [ 0, 1, 3 ] } ],
57           );
58         }
59
60         ...
61
62       That module would generate help output like this:
63
64         $ yourapp help initialize
65         yourapp initialize [-Rv] [long options...] [DIRECTORY]
66
67         The initialize command prepares the application...
68
69               --help            This usage screen
70               -R --skip-refs    skip reference checks during init
71               -v --values       starting values
72

AUTHOR

74       Ricardo Signes <rjbs@cpan.org>
75

77       This software is copyright (c) 2016 by Ricardo Signes.
78
79       This is free software; you can redistribute it and/or modify it under
80       the same terms as the Perl 5 programming language system itself.
81
82
83
84perl v5.32.0                      2020-07-28        App::Cmd::Command::help(3)
Impressum