home *** CD-ROM | disk | FTP | other *** search
- package CPANPLUS::Error;
-
- use strict;
-
- use Log::Message private => 0;;
-
- =pod
-
- =head1 NAME
-
- CPANPLUS::Error
-
- =head1 SYNOPSIS
-
- use CPANPLUS::Error qw[cp_msg cp_error];
-
- =head1 DESCRIPTION
-
- This module provides the error handling code for the CPANPLUS
- libraries, and is mainly intended for internal use.
-
- =head1 FUNCTIONS
-
- =head2 cp_msg("message string" [,VERBOSE])
-
- Records a message on the stack, and prints it to C<STDOUT> (or actually
- C<$MSG_FH>, see the C<GLOBAL VARIABLES> section below), if the
- C<VERBOSE> option is true.
- The C<VERBOSE> option defaults to false.
-
- =head2 msg()
-
- An alias for C<cp_msg>.
-
- =head2 cp_error("error string" [,VERBOSE])
-
- Records an error on the stack, and prints it to C<STDERR> (or actually
- C<$ERROR_FH>, see the C<GLOBAL VARIABLES> sections below), if the
- C<VERBOSE> option is true.
- The C<VERBOSE> options defaults to true.
-
- =head2 error()
-
- An alias for C<cp_error>.
-
- =head1 CLASS METHODS
-
- =head2 CPANPLUS::Error->stack()
-
- Retrieves all the items on the stack. Since C<CPANPLUS::Error> is
- implemented using C<Log::Message>, consult its manpage for the
- function C<retrieve> to see what is returned and how to use the items.
-
- =head2 CPANPLUS::Error->stack_as_string([TRACE])
-
- Returns the whole stack as a printable string. If the C<TRACE> option is
- true all items are returned with C<Carp::longmess> output, rather than
- just the message.
- C<TRACE> defaults to false.
-
- =head2 CPANPLUS::Error->flush()
-
- Removes all the items from the stack and returns them. Since
- C<CPANPLUS::Error> is implemented using C<Log::Message>, consult its
- manpage for the function C<retrieve> to see what is returned and how
- to use the items.
-
- =cut
-
- BEGIN {
- use Exporter;
- use Params::Check qw[check];
- use vars qw[@EXPORT @ISA $ERROR_FH $MSG_FH];
-
- @ISA = 'Exporter';
- @EXPORT = qw[cp_error cp_msg error msg];
-
- my $log = new Log::Message;
-
- for my $func ( @EXPORT ) {
- no strict 'refs';
-
- my $prefix = 'cp_';
- my $name = $func;
- $name =~ s/^$prefix//g;
-
- *$func = sub {
- my $msg = shift;
-
- ### no point storing non-messages
- return unless defined $msg;
-
- $log->store(
- message => $msg,
- tag => uc $name,
- level => $prefix . $name,
- extra => [@_]
- );
- };
- }
-
- sub flush {
- return reverse $log->flush;
- }
-
- sub stack {
- return $log->retrieve( chrono => 1 );
- }
-
- sub stack_as_string {
- my $class = shift;
- my $trace = shift() ? 1 : 0;
-
- return join $/, map {
- '[' . $_->tag . '] [' . $_->when . '] ' .
- ($trace ? $_->message . ' ' . $_->longmess
- : $_->message);
- } __PACKAGE__->stack;
- }
- }
-
- =head1 GLOBAL VARIABLES
-
- =over 4
-
- =item $ERROR_FH
-
- This is the filehandle all the messages sent to C<error()> are being
- printed. This defaults to C<*STDERR>.
-
- =item $MSG_FH
-
- This is the filehandle all the messages sent to C<msg()> are being
- printed. This default to C<*STDOUT>.
-
- =cut
- local $| = 1;
- $ERROR_FH = \*STDERR;
- $MSG_FH = \*STDOUT;
-
- package Log::Message::Handlers;
- use Carp ();
-
- {
-
- sub cp_msg {
- my $self = shift;
- my $verbose = shift;
-
- ### so you don't want us to print the msg? ###
- return if defined $verbose && $verbose == 0;
-
- my $old_fh = select $CPANPLUS::Error::MSG_FH;
-
- print '['. $self->tag . '] ' . $self->message . "\n";
- select $old_fh;
-
- return;
- }
-
- sub cp_error {
- my $self = shift;
- my $verbose = shift;
-
- ### so you don't want us to print the error? ###
- return if defined $verbose && $verbose == 0;
-
- my $old_fh = select $CPANPLUS::Error::ERROR_FH;
-
- ### is only going to be 1 for now anyway ###
- ### C::I may not be loaded, so do a can() check first
- my $cb = CPANPLUS::Internals->can('_return_all_objects')
- ? (CPANPLUS::Internals->_return_all_objects)[0]
- : undef;
-
- ### maybe we didn't initialize an internals object (yet) ###
- my $debug = $cb ? $cb->configure_object->get_conf('debug') : 0;
- my $msg = '['. $self->tag . '] ' . $self->message . "\n";
-
- ### i'm getting this warning in the test suite:
- ### Ambiguous call resolved as CORE::warn(), qualify as such or
- ### use & at CPANPLUS/Error.pm line 57.
- ### no idea where it's coming from, since there's no 'sub warn'
- ### anywhere to be found, but i'll mark it explicitly nonetheless
- ### --kane
- print $debug ? Carp::shortmess($msg) : $msg . "\n";
-
- select $old_fh;
-
- return;
- }
- }
-
- 1;
-
- # Local variables:
- # c-indentation-style: bsd
- # c-basic-offset: 4
- # indent-tabs-mode: nil
- # End:
- # vim: expandtab shiftwidth=4:
-