Log::Minimal - Minimal but customizable logger.

use Log::Minimal;

critf("%s","foo"); # 2010-10-20T00:25:17 [CRITICAL] foo at example.pl line 12
warnf("%d %s %s", 1, "foo", $uri);
infof('foo');
debugf("foo"); print if $ENV{LM_DEBUG} is true

# with full stack trace
critff("%s","foo");
# 2010-10-20T00:25:17 [CRITICAL] foo at lib/Example.pm line 10, example.pl line 12
warnff("%d %s %s", 1, "foo", $uri);
infoff('foo');
debugff("foo"); print if $ENV{LM_DEBUG} is true

my $serialize = ddf({ 'key' => 'value' });

# die with formatted message
croakf('foo');
croakff('%s %s', $code, $message);

Log::Minimal is Minimal but customizable log module.

• critf(($message:Str|$format:Str,@list:Array));

    critf("could't connect to example.com");
    critf("Connection timeout timeout:%d, host:%s", 2, "example.com");
  

  Display CRITICAL messages. When two or more arguments are passed to the function, the first argument is treated as a format of printf.

    local $Log::Minimal::AUTODUMP = 1;
    critf({ foo => 'bar' });
    critf("dump is %s", { foo => 'bar' });
  

  If $Log::Minimal::AUTODUMP is true, reference or object message is serialized with Data::Dumper automatically.

• warnf(($message:Str|$format:Str,@list:Array));

  Display WARN messages.

• infof(($message:Str|$format:Str,@list:Array));

  Display INFO messages.

• debugf(($message:Str|$format:Str,@list:Array));

  Display DEBUG messages, if $ENV{LM_DEBUG} is true.

• critff(($message:Str|$format:Str,@list:Array));

    critff("could't connect to example.com");
    critff("Connection timeout timeout:%d, host:%s", 2, "example.com");
  

  Display CRITICAL messages with stack trace.

• warnff(($message:Str|$format:Str,@list:Array));

  Display WARN messages with stack trace.

• infoff(($message:Str|$format:Str,@list:Array));

  Display INFO messages with stack trace.

• debugff(($message:Str|$format:Str,@list:Array));

  Display DEBUG messages with stack trace, if $ENV{LM_DEBUG} is true.

• croakf(($message:Str|$format:Str,@list:Array));

  die with formatted $message

    croakf("critical error");
    # 2011-06-10T16:27:26 [ERROR] critical error at sample.pl line 23
  

• croakff(($message:Str|$format:Str,@list:Array));

  die with formatted $message with stack trace

• ddf($value:Any)

  Utility method that serializes given value with Data::Dumper;

    my $serialize = ddf($hashref);
  

• $ENV{LM_DEBUG}

  To print debugf and debugff messages, $ENV{LM_DEBUG} must be true.

  You can change variable name from LM_DEBUG to arbitrary string which is specified by "env_debug" in use line. Changed variable name affects only in package locally.

    use Log::Minimal env_debug => 'FOO_DEBUG';
    
  
    $ENV{LM_DEBUG}  = 1;
    $ENV{FOO_DEBUG} = 0;
    debugf("hello"); # no output
    
  
    $ENV{FOO_DEBUG} = 1;
    debugf("world"); # print message
  

• $ENV{LM_COLOR}

  $ENV{LM_COLOR} is used as default value of $Log::Minimal::COLOR

• $ENV{LM_DEFAULT_COLOR}

  $ENV{LM_DEFAULT_COLOR} is used as default value of $Log::Minimal::DEFAULT_COLOR

  Format of value is "LEVEL=FG;BG:LEVEL=FG;BG:...". "FG" and "BG" are optional.

  For example:

    export LM_DEFAULT_COLOR='debug=red:info=;cyan:critical=yellow;red'
  

• $Log::Minimal::COLOR

  Coloring log messages. Disabled by default.

• $Log::Minimal::PRINT

  To change the method of outputting the log, set $Log::Minimal::PRINT.

    # with PSGI Application. output log with request uri.
    my $app = sub {
        my $env = shift;
        local $Log::Minimal::PRINT = sub {
            my ( $time, $type, $message, $trace,$raw_message) = @_;
            $env->{psgi.errors}->print(
                "$time [$env->{SCRIPT_NAME}] [$type] $message at $trace\n");
        };
        run_app(...);
    }
  

  $message includes color sequences, If you want raw message text, use $raw_message. default is

    sub {
      my ( $time, $type, $message, $trace,$raw_message) = @_;
      warn "$time [$type] $message at $trace\n";
    }
  

• $Log::Minimal::DIE

  To change the format of die message, set $Log::Minimal::DIE.

    local $Log::Minimal::PRINT = sub {
        my ( $time, $type, $message, $trace) = @_;
        die "[$type] $message at $trace\n"; # not need time
    };
  

  default is

    sub {
      my ( $time, $type, $message, $trace) = @_;
      die "$time [$type] $message at $trace\n";
    }
  

• $Log::Minimal::LOG_LEVEL

  Set level to output log.

    local $Log::Minimal::LOG_LEVEL = "WARN";
    infof("foo"); #print nothing
    warnf("foo");
  

  Support levels are DEBUG,INFO,WARN,CRITICAL and NONE. If NONE is set, no output except croakf and croakff. Default log level is DEBUG.

• $Log::Minimal::AUTODUMP

  Serialize message with Data::Dumper.

    warnf("%s", {foo => 'bar'}); # HASH(0x100804ed0)
  
    local $Log::Minimal::AUTODUMP = 1;
    warnf("dump is %s", {foo=>'bar'}); #dump is {foo=>'bar'}
  
    my $uri = URI->new("http://search.cpan.org/");
    warnf("uri: '%s'", $uri); # uri: 'http://search.cpan.org/'
  

  If message is object and has overload methods like '""' or '0+', Log::Minimal uses it instead of Data::Dumper.

• $Log::Minimal::TRACE_LEVEL

  Like a $Carp::CarpLevel, this variable determines how many additional call frames are to be skipped. Defaults to 0.

• $Log::Minimal::ESCAPE_WHITESPACE

  If this value is true, whitespace other than space will be represented as [\n\t\r]. Defaults to 0.

Masahiro Nagano <kazeburo {at} gmail.com>

Yuji Shimada (xaicron)

Yoshihiro Sugi (sugyan)

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