Appender::ScreenColoredLevels

Section: User Contributed Perl Documentation (3)
Updated: 2021-02-08
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NAME

Log::Log4perl::Appender::ScreenColoredLevels - Colorize messages according to level

SYNOPSIS

    use Log::Log4perl qw(:easy);

    Log::Log4perl->init(\ <<'EOT');
      log4perl.category = DEBUG, Screen
      log4perl.appender.Screen = \
          Log::Log4perl::Appender::ScreenColoredLevels
      log4perl.appender.Screen.layout = \
          Log::Log4perl::Layout::PatternLayout
      log4perl.appender.Screen.layout.ConversionPattern = \
          %d %F{1} %L> %m %n
    EOT

      # Appears black
    DEBUG "Debug Message";

      # Appears green
    INFO  "Info Message";

      # Appears blue
    WARN  "Warn Message";

      # Appears magenta
    ERROR "Error Message";

      # Appears red
    FATAL "Fatal Message";

DESCRIPTION

This appender acts like Log::Log4perl::Appender::Screen, except that it colorizes its output, based on the priority of the message sent.

You can configure the colors and attributes used for the different levels, by specifying them in your configuration:

    log4perl.appender.Screen.color.TRACE=cyan
    log4perl.appender.Screen.color.DEBUG=bold blue

You can also specify nothing, to indicate that level should not have coloring applied, which means the text will be whatever the default color for your terminal is. This is the default for debug messages.

    log4perl.appender.Screen.color.DEBUG=

You can use any attribute supported by Term::ANSIColor as a configuration option.

    log4perl.appender.Screen.color.FATAL=\
        bold underline blink red on_white

The commonly used colors and attributes are:

attributes: BOLD, DARK, UNDERLINE, UNDERSCORE, BLINK
colors: BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE
background colors: ON_BLACK, ON_RED, ON_GREEN, ON_YELLOW, ON_BLUE, ON_MAGENTA, ON_CYAN, ON_WHITE

See Term::ANSIColor for a complete list, and information on which are supported by various common terminal emulators.

The default values for these options are:

Trace: Yellow
Debug: None (whatever the terminal default is)
Info: Green
Warn: Blue
Error: Magenta
Fatal: Red

The constructor "new()" takes an optional parameter "stderr", if set to a true value, the appender will log to STDERR. If "stderr" is set to a false value, it will log to STDOUT. The default setting for "stderr" is 1, so messages will be logged to STDERR by default. The constructor can also take an optional parameter "color", whose value is a hashref of color configuration options, any levels that are not included in the hashref will be set to their default values.

Using ScreenColoredLevels on Windows

Note that if you're using this appender on Windows, you need to fetch Win32::Console::ANSI from CPAN and add

    use Win32::Console::ANSI;

to your script.

LICENSE

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

AUTHOR

Please contribute patches to the project on Github:

    http://github.com/mschilli/log4perl

Send bug reports or requests for enhancements to the authors via our

MAILING LIST (questions, bug reports, suggestions/patches): log4perl-devel@lists.sourceforge.net

Authors (please contact them via the list above, not directly): Mike Schilli <m@perlmeister.com>, Kevin Goess <cpan@goess.org>

Contributors (in alphabetical order): Ateeq Altaf, Cory Bennett, Jens Berthold, Jeremy Bopp, Hutton Davidson, Chris R. Donnelly, Matisse Enzer, Hugh Esco, Anthony Foiani, James FitzGibbon, Carl Franks, Dennis Gregorovic, Andy Grundman, Paul Harrington, Alexander Hartmaier David Hull, Robert Jacobson, Jason Kohles, Jeff Macdonald, Markus Peter, Brett Rann, Peter Rabbitson, Erik Selberg, Aaron Straup Cope, Lars Thegler, David Viner, Mac Yang.