Appender::ScreenColoredLevels(3)           User Contributed Perl Documentation


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 all levels to STDERR.  If "stderr" is
       set to a false value, it will log all levels to STDOUT. Otherwise,
       "stderr" may be set to a hash, with a key for each "log4p_level" and a
       truthy value to dynamically use stderr.  The default setting for
       "stderr" is 1, so all messages will be logged to STDERR by default.

           # All messages/levels to STDERR
           my $app = Log::Log4perl::Appender::Screen->new(
               stderr  => 1,
           );

           # Only ERROR and FATAL to STDERR (case-sensitive)
           my $app = Log::Log4perl::Appender::Screen->new(
               stderr  => { ERROR => 1, FATAL => 1},
           );

       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
       Copyright 2002-2026 by Mike Schilli <m@perlmeister.com> and Kevin Goess
       <cpan@goess.org>.

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

perl v5.42.2                      2026-08-14  Appender::ScreenColoredLevels(3)