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Man Pages


Manual Reference Pages  -  NO::WORRIES::WARN (3)

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NAME

No::Worries::Warn - warning handling without worries

CONTENTS

SYNOPSIS



  use No::Worries::Warn qw(warnf handler);

  if (open($fh, "<", $path)) {
      ... so something in case of success ...
  } else {
      warnf("cannot open(%s): %s", $path, $!);
      ... do something else in case of failure ...
  }

  $ ./myprog
  myprog: cannot open(foo): No such file or directory

  $ NO_WORRIES=cluck ./myprog
  myprog: cannot open(foo): No such file or directory at myprog line 16
      main::test() called at ./myprog line 19



DESCRIPTION

This module eases warning handling by providing a convenient wrapper around warn() with sprintf()-like API. warnf() is to warn() what printf() is to print() with, in addition, the trimming of leading and trailing spaces.

It also provides a handler for warn() that prepends a prefix ($No::Worries::Warn::Prefix) to all warnings. It also uses the NO_WORRIES environment variable to find out if Carp’s carp() or cluck() should be used instead of warn(). Finally, the wrapper can be told to also log warnings to syslog (see $No::Worries::Warn::Syslog).

This handler can be installed simply by importing it:



  use No::Worries::Warn qw(warnf handler);



Alternatively, it can be installed manually:



  use No::Worries::Warn qw(warnf);
  $SIG{__WARN__} = \&No::Worries::Warn::handler;



FUNCTIONS

This module provides the following functions (none of them being exported by default):
warnf(MESSAGE) report a warning described by the given MESSAGE
warnf(FORMAT, ARGUMENTS...) idem but with sprintf()-like API
handler(MESSAGE) $SIG{__WARN__} compatible warning handler (this function cannot be imported)

GLOBAL VARIABLES

This module uses the following global variables (none of them being exported):
$Prefix prefix to prepend to all warnings (default: the program name)
$Syslog true if warnings should also be sent to syslog using No::Worries::Syslog’s syslog_warning() (default: false)

ENVIRONMENT VARIABLES

This module uses the NO_WORRIES environment variable to find out how warnings will be reported. Supported values are:
carp Carp’s carp() will be used instead of warn()
cluck Carp’s cluck() will be used instead of warn()

SEE ALSO

Carp, No::Worries, No::Worries::Die, No::Worries::Syslog.

AUTHOR

Lionel Cons <http://cern.ch/lionel.cons>

Copyright (C) CERN 2012-2013

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perl v5.20.3 NO::WORRIES::WARN (3) 2013-05-21

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