Perinci::CmdLine::Manual::HowTo::Debugging(3pm)

NAME
Perinci::CmdLine::Manual::HowTo::Debugging - How-to guides related to debugging

VERSION
This document describes version 2.000.2 of Perinci::CmdLine::Manual::HowTo::Debugging (from Perl distribution Perinci-CmdLine), released on 2026-03-30.

DESCRIPTION
If you encounter issues with Perinci::CmdLine, you can try these things to aid with debugging:

Increase log level. Perinci::CmdLine uses Log::ger. If your command-line object is instantiated with "log" attribute set to true, you just need to specify "--verbose", "--debug", or "--trace" command-line options to see more logging statements:

 % your-cli --verbose ...
 % your-cli --debug ...
 % your-cli --trace ...
 % your-cli --log-level trace ... ;# ditto

If your command-line object is not instantiated with "log" attribute set to true, you can enable logging with:

 % PERL5OPT=-MLog::ger::Screen LOG_LEVEL=info your-cli ...
 % PERL5OPT=-MLog::ger::Screen DEBUG=1 your-cli ...
 % PERL5OPT=-MLog::ger::Screen TRACE=1 your-cli ...

Dump parsed arguments, internal data structures. If seeing log statements does not give clue, you can try dumping various data structures. This can be done with plugins. For example, to dump parsed command-line arguments after validation and then exit, you can use the following command (setting log level to trace is helpful to see the program flow and at what points the plugins are triggered):

 % PERINCI_CMDLINE_PLUGINS=-DumpArgs,-Exit@after_validate_args your-cli --trace ...

Logging other components. See Log::ger::For::LWP, Log::ger::For::HTTP::Tiny, Log::ger::For::DBI, Log::ger::DBI::Query.

HOMEPAGE
Please visit the project's homepage at <https://metacpan.org/release/Perinci-CmdLine>.

SOURCE
Source repository is at <https://github.com/perlancar/perl-Perinci-CmdLine>.

SEE ALSO
Log::ger

AUTHOR
perlancar <perlancar@cpan.org>

CONTRIBUTING
To contribute, you can send patches by email/via RT, or send pull requests on GitHub.

Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:

 % prove -l

If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me.

COPYRIGHT AND LICENSE
This software is copyright (c) 2026 by perlancar <perlancar@cpan.org>.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

BUGS
Please report any bugs or feature requests on the bugtracker website <https://rt.cpan.org/Public/Dist/Display.html?Name=Perinci-CmdLine>

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.